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CompactLogix 1769-IT6 - Perceptive Industries

1. 0 215 0 This position is always 0 for positive numbers Publication 1769 UM004A EN P B 2 Two s Complement Binary Numbers Negative Decimal In two s complement notation the far left position is always 1 for negative Values values The equivalent decimal value of the binary number is obtained by subtracting the value of the far left position 32768 from the sum of the values of the other positions In the figure below all positions are 1 the value is 32767 32768 1 For example 1111 1000 0010 0011 214 213 212 211 75 21 20 _ 715 _ 16384 8192 4096 2048 32 2 1 32768 30755 32768 2013 1x2 16384 16384 1x2 8192 8192 1x21 4096 4096 1x211 2048 2048 1x2 1024 1024 1x2 512 512 1x28 256 256 1x2 128 128 1x28 264 64 1x25 232 32 1x24 16 16 1x2 8 8 1x2 4 4 1x2 2 2 L 4x2924 4 1 4d 4 X 1c04 T T X 1 4 3 1 4 32767 L_1x 215 32768 This position is always 1 for negative numbers Publication 1769 UM004A EN P International Temperature Scale of 1990 Type B Thermocouples Appendix C Thermocouple Descriptions The information in this appendix was extracted from the NIST Monograph 175 issued in January 1990 which supersedes the IPTS 68 Monograph 125 issued in March 1974 NIST Monograph 175 is provided by the United States Department of Commerce
2. A 1 Input Specifications A 2 Repeatability at 25 C 77 F A 3 PCCM ACY icc bala aa oA oa pa traut od A 4 Accuracy Versus Thermocouple Temperature and Filter PPEQUuGhCy yay eene red ub de ie ua ER OD RE ad d A 5 Temperature Drift pore Peet n PU PES e ron I deed 23 Appendix B Two s Complement Binary Positive Decimal B 1 Numbers Negative Decimal Values B 2 Appendix C Thermocouple Descriptions International Temperature Scale 1990 1 Type B Thermocouples C 1 Type E 1 3 Type J Thermocouples ox ospearen te wen m ee eed C 5 Type Thermocouples C 6 N Thermocouples C 8 Type R Thermocouples C 10 Type S C 11 Type T Thermocouples C 13 voter pocket pp loop EO edo eal erar Mots C 16 Appendix D Using Thermocouple Using a Grounded Junction Thermocouple D 1 Junctions Using an Ungrounded Isolated Junction Thermocouple D 2 Using an Exposed Junction Thermocouple D 3 Publication 1769 UM004A EN P Table of Contents iv Appendix E Module Configuration Using Module Addressing
3. E 1 MicroLogix 1500 and RSLogix 1769 116 Configuration E 2 500 Configuring the 1769 IT6 in a MicroLogix 1500 System E 3 Appendix F Configuring Your 1769 IT6 Configuring I O F 4 Module with the Generic Configuring a 1769 IT6 Thermocouple Module F 6 Profile for CompactLogix Controllers in RSLogix 5000 Appendix G Configuring Your 1769 IT6 Configuring the 1769 1 6 G 4 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter Glossary Index Publication 1769 UM004A EN P Preface Who Should Use This Manual How to Use This Manual Read this preface to familiarize yourself with the rest of the manual This preface covers the following topics e who should use this manual how to use this manual e related publications e conventions used in this manual Rockwell Automation support Use this manual if you are responsible for designing installing programming or troubleshooting control systems that use Allen Bradley Compact I O and or compatible controllers such as MicroLogix 1500 or CompactLogix As much as possible we organized this manual to explain in a task by task manner how to install configure program operate and troubleshoot a control system using the 1769 IT6 Manual Contents If you want See An overview of the thermocouple mV
4. General Specifications Specifications Specification Dimensions Approximate Shipping Weight with carton Value 118 mm height x 87 mm depth x 35 mm width height including mounting tabs is 138 mm 4 65 in height x 3 43 in depth x 1 38 in width height including mounting tabs is 5 43 in 276g 0 61 Ibs Storage Temperature 40 C to 85 C 40 F to 185 F Operating Temperature 0 to 60 C 32 F to 140 F Operating Humidity 5 to 95 non condensing Operating Altitude 2000 meters 6561 feet Vibration Operating 10 to 500 Hz 5G 0 030 in peak to peak Relay Operation 2G Shock Operating 30G 11 ms panel mounted 20G 11 ms DIN rail mounted Relay Operation 7 5G panel mounted 5G DIN rail mounted Non Operating 40G panel mounted 30G DIN rail mounted System Power Supply Distance Rating 8 The module may not be more than 7 modules away from a system power supply Recommended Cable Belden 8761 shielded for millivolt inputs Shielded thermocouple extension wire for the specific type of thermocouple you are using Follow thermocouple manufacturer s recommendations Agency Certification e C UL certified under CSA C22 2 No 142 e UL 508 listed e CE compliant for all applicable directives Hazardous Environment Class Class 1 Division 2 Hazardous Location Groups A B C D UL 1604 C UL under CSA C22 2 No 213 Rad
5. Rockwell Automation Dodge PPP hl ohne K 4 pil Graph Spreadsheet Master Sk 4 Offline 2 In the left column under Category click on sign next to Communication Adapters The list of products under Communication Adapters contains the 1769 ADN A Should this adapter not appear under Communication Adapters your RSNetworx for DeviceNet software is not version 3 00 or later To continue you will need to obtain an upgrade for your software If the 1769 ADN A does appear double click it and it will be placed on the network to the right as shown below Publication 1769 UM004A EN P Configuring Your 1769 1 6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter 6 3 2 DeviceNet RSNetWorx for DeviceNet OE x Edit View Network Device Tools Help EE ES eve er tX xl as Hardware xl 1769 ADN A E C Category AC Drive Barcode Scanner Common Interfaces No Device Object Communication Adapter 1734 4DN Point 1 0 Scanner J 1734 4DN PointlO DeviceNet Adapter 1747 SDN Scanner Module 1756 DNB 1761 NET DNI Device Net Interface H 1761 NET DNI Series B DeviceNet Interf lt 1770 KFD RS232 Interface 1771 SDN Scanner Module Wf 1784 CPCIDS DeviceNet Scanner 1784 PCD PCMCIA Interface 1784 PCDS Scanner Bf 1784 PCID DeviceNet Interface Card 9 88 1784 PCIDS DeviceNet Scanner amp
6. E 4 Module Configuration Using MicroLogix 1500 and RSLogix 500 Publication 1769 UM004A EN P A communications dialog appears identifying the current communications configuration so that you can verify the target controller If the communication settings are correct click on Read IO Config Read 10 Configration from Online Processor Eg Driver Route Processor Node DF1 1 Decimal 71 X Octal Last Configured m 1 Node 1d local Reply Timeout fi 0 Sec Who Active Cancel Help The actual I O configuration is displayed In this example a second tier of I O is attached to the MicroLogix 1500 processor 140 Configuration yx r Current Cards Available Filter Al 10 Read 10 Config 1769 48l amp Input Isolated 120 VAC 1769 1416 16 Input 79 132 VAC 17684F4 Analog 4 Channel Input Module 17694M12 12 Input 159 265 VAC 17694016 16 Input 10 30 VDC 1769 IQ6XOW4 6 Input 24 VDC 4 Dutput RLY Micrologix 1500 LSP Series B 1 769 IR6 6 Channel RTD Module Any 1769 UnPowered Cable 1 769 IT6 6 Channel Thermocouple Module 6 Channel Thermocouple Module 1769 048 8 Output 120 240 VAC 1769 PA2 Power Supply 1769 0816 16 Output 24 VDC Source 2 16 Output 24 VDC Source w Protection Analog 2 Channel Output Module 16 Output 24 VDC Sink 8 Output Relay 8 Output Isolated Relay Power Supply Power Supply Any 1769 PowerSupply Any 1769 UnPowered Cable Other Requires 1 0 Card Type I
7. AB Allen Bradley Compact 1 0 Thermocouple mV Input Module Catalog Number 1769 IT6 User Manual Automation Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation Rockwell International Corporation does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Rockwell Automation publication SGI 1 1 Safety Guidelines for tbe Application Installation and Maintenance of Solid State Control available from your local Rockwell Automation office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or part without written permission of Rockwell Automation is prohib
8. Removing and Replacing theTerminal Block When wiring the module you do not have to remove the terminal block If you remove the terminal block use the write on label located on the side of the terminal block to identify the module location and type SLOT MODULE TYPE To remove the terminal block loosen the upper and lower retaining screws The terminal block will back away from the module as you remove the screws Be careful not to damage the CJC sensors When replacing the terminal block torque the retaining screws to 0 46 Nm 4 1 in Ibs Installation and Wiring 3 11 wiring the finger safe terminal block upper retaining screw lower retaining screw Wiring the Finger Safe Terminal Block When wiring the terminal block keep the finger safe cover in place 1 Loosen the terminal screws to be wired 2 Route the wire under the terminal pressure plate You can use the bare wire or a spade lug The terminals accept a 6 35 mm 0 25 in spade lug The terminal screws are non captive Therefore it is possible to use a ring lug maximum 1 4 inch o d with a 0 139 inch minimum i d M3 5 with the module 3 Tighten the terminal screw making sure the pressure plate secures the wire Recommended torque when tightening terminal screws is 0 68 Nm 6 in Ibs If you need to remove the finger safe cover insert a screwdriver into one of the squar
9. Error Type Module Specific Configuration Error 1 Xrepresents the Don t Care digi Diagnostics and Troubleshooting 5 7 Module ExtendedError Error Description Equivalent Error Information Code Code Binary Binary X400 010 0 0000 0000 General configuration error no additional information X401 010 0 0000 0001 Invalid input type selected channel 0 X402 010 0 0000 0010 Invalid input type selected channel 1 X403 010 000000011 Invalid input type selected channel 2 X404 010 000000100 Invalid input type selected channel 3 X405 010 000000101 Invalid input type selected channel 4 X406 010 000000110 Invalid input type selected channel 5 X407 010 0 0000 0111 Invalid input filter selected channel 0 X408 010 000001000 Invalid input filter selected channel 1 X409 010 0 0000 1001 Invalid input filter selected channel 2 X40A 010 000001010 Invalid input filter selected channel 3 X40B 010 0 0000 1011 Invalid input filter selected channel 4 X40C 010 000001100 Invalid input filter selected channel 5 X40D 010 0 0000 1101 Invalid input format selected channel 0 X40E 010 000001110 Invalid input format selected channel 1 X40F 010 0 0000 1111 Invalid input format selected channel 2 X410 010 000010000 Invalid input format selected channel 3 X411 010 0 0001 0001 Invalid input format selected channel 4
10. Error Type Hex Module ExtendedError Error Description Equivalent Error Information Code Code Binary Binary No Error X000 000 000000000 No Error General Common X200 001 000000000 General hardware error no additional information 201 001 0 0000 0001 Power up reset state Hardware Specific X300 001 100000000 General hardware error no additional information X301 001 100000001 Microprocessor hardware error hardware ROM error X302 001 100000010 Hardware EEPROM error X303 001 100000011 Channel 0 calibration error X304 001 100000100 Channel 1 calibration error X305 001 100000101 Channel 2 calibration error X306 001 100000110 Channel calibration error X307 001 100000111 Channel 4 calibration error X308 001 1 0000 1000 Channel 5 calibration error X309 001 100001001 CJCO calibration error X30A 001 100001010 CJC1 calibration error X30B 001 100001011 Channel 0 Analog Digital Converter error X30C 001 100001100 Channel 1 Analog Digital Converter error X30D 001 100001101 Channel 2 Analog Digital Converter error X30E 001 10000 1110 Channel 3 Analog Digital Converter error X30F 001 100001111 Channel 4 Analog Digital Converter error X310 001 100010000 Channel 5 Analog Digital Converter error X311 001 100010001 CUCO Analog Digital Converter error X312 001 100010010 CJC1 Analog Digital Converter error Publication 1769 UM004A EN P Table 5 3 Extended Error Codes
11. 1 2 General Diagnostic Features 1 4 System OVE rE W aus eatin es ee BK PE ee een 1 4 System 1 4 Module 1 4 Module Field 1 5 Chapter 2 Quick Start Before You Begin 2 1 for Experienced Users Required Tools and 2 1 What You Need 2 2 Chapter 3 Installation and Wiring Compliance to European Union Directives 3 1 EMC DIteGVvG epe re aon Be TP iem EM 3 1 Low Voltage 3 1 Power Requirements os ai i e eee eee eee 3 2 General 5 3 2 Hazardous Location Considerations 3 2 Prevent Electrostatic Discharge 3 3 Re move POWetrz ze EOE a Ee ER bea GREEN S 3 3 Selecting a Location 3 3 System Assembly onana anaa 3 4 A TEE oe ae E ANA 3 6 Minimum 3 6 Panel Mo ntin iR 3 6 DIN Rail Mounting 3 7 Replacing a Single Module within a System 3 7 Publication 1769 UM004A EN P Table of Contents ii Module Data Status and Channel Configuration Diagnostics an
12. 80 60 Effective Resolution F 40 20 0 500 400 300 200 100 0 100 200 300 400 500 600 700 800 Temperature Publication 1769 UM004A EN P Determining Module Update Time Module Data Status and Channel Configuration 4 33 Table 4 6 Effective Resolution vs Input Filter Selection for Millivolt Inputs Filter Frequency 50 100 10 Hz 6 uV 6 uV 50Hz 9 uV 12 uV 60 Hz 9 uV 12 uV 250 Hz 125 uV 150 uV 500 Hz 250 uV 300 uV 1 kHz 1000 uV 1300 uV The table below identifies the number of significant bits used to represent the input data for each available filter frequency The number of significant bits is defined as the number of bits that will have little of no jitter due to noise and is used in defining the effective resolution The resolutions provided by the filters apply to the raw proportional data format only The module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and provide the resulting data values to the processor Module update time can be calculated by adding the sum of all enabled channel s times The module sequentially samples the enabled channels in a continuous loop as shown below Sample Sample Sample Sample Enabled
13. 107 2 The International Practical Temperature Scale of 1968 Amended Edition of 1975 Metrologia 12 7 17 1976 3 Mangum B W Furukawa G T Guidelines for realizing the International Temperature Scale of 1990 ITS 90 Natl Inst Stand Technol Tech Note 1265 1990 August 190 p 4 The 1976 Provisional 0 5 to 30 Temperature Scale Metrologia 15 65 68 1979 5 ASTM American Society for Testing and Materials Manual on the use of thermocouples in temperature measurement Special Tecb Publ 470B edited by Benedict P Philadelphia ASTM 1981 258p 6 Hansen M Anderko Constitution of binary alloys New York McGraw Hill Book Co 1958 7 ASTM American Society for Testing and Materials Standard E230 87 1992 Annual Book of ASTM Standards Vol 14 03 Philadelphia ASTM 1992 102 230 8 Sparks L L Powell R L Hall W J Reference tables for low temperature thermocouples Natl Bur Stand U S Monogr 124 1972 June 1 9 Stam C D Wang T P Effect of oxidation on stability of thermocouples Proceedings of the American Society for Testing and Materials Vol 63 1185 1194 1963 10 Roeser W F Dahl A I Reference tables for iron constantan and copper constantan thermocouples Res Natl Bur Stand U S 20 337 355 RP1080 1938 March 11 Dahl A I Stability of base metal thermocouples in air from 800 to 2200 F J Res Natl Bur Stand U S 24 205
14. 1788 CN2DN Linking Device g 1794 ADN DeviceNet Flex 1 0 Adapter ff 1798 DeviceNet Adapter Ethernet Adaptor m Modular DSA 2 OMe ERIS Ki 4 gt bil Graph Spreadsheet Master Sle 4 Ready Offline 2 To configure I O for the adapter double click the adapter that you just placed on the network and the following screen appears Ee 1769 ADN A x General 1 0 Bank 1 Configuration 1 0 Bank 2 Configuration 140 Bank 3 Configuration Reset Summary J 1769 ADN A Name Description Address 0 Device Identity Primary Vendo RockwellAutomation AllenBradey 1 Device Communication Adapter 12 Produc 76sADNA e 7 Catalog Revision gt At this point you may modify the adapters DeviceNet node address if desired Publication 1769 UM004A EN P G 4 X Configuring Your 1769 IT6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter Configuring the 1769 IT6 Publication 1769 UM004A EN P Next click on the I O Bank 1 Configuration tab The following screen appears EC 1769 ADN A General 1 0 Bank 1 Configuration 1 0 Bank 2 Configuration 140 Bank 3 Configuration Reset Summary Configuration Device Configure Device Configure 1769 4DN Slot 0 Empty RE Empty Y Empty Y Empty Empty E Empty Empty mpty X Emp X mpty Y
15. C 382 F to 2498 F 1 C 1 8 F 1 5 C 22 7 F 0 4995 C C 0 4995 F F Thermocouple 270 C to 225 C 454 F to 373 F 7 5 C 13 5 F 10 C 18 F 0 0378 C C 0 0378 F F Thermocouple E 210 to 1000 C 346 F to 1832 F 0 5 C 0 9 F 0 8 1 5 F 0 0199 C C 0 0199 F F Thermocouple E 270 C to 210 C 454 F to 346 F 4 2 C 7 6 F 6 3 11 4 F 0 2698 0 2698 F F Thermocouple R 1 7 3 1 F 2 6 C 4 7 F 0 0613 C C 0 0613 F F Thermocouple S 1 7 3 1 F 2 6 C 4 7 F 0 0600 C C 0 0600 F F Thermocouple C 1 8 4 3 3 F 3 5 6 3 F 0 0899 C C 0 0899 F F Thermocouple B 3 0 5 4 F 4 5 C 4 8 1 F 0 1009 C C 0 1009 F F 50 mV 15 uV 25 uV 0 44uV C 0 80uV F 100 mV 20 uV 30 uV 3 0 69uV C 01 25UV F 1 The module uses the National Institute of Standards and Technology NIST ITS 90 standard for t hermocouple linearization 2 Accuracy and temperature drift information does not include the affects of errors or drift in the cold junction compensation circuit 3 Accuracy is dependent upon the analog digital converter output rate selection data format and 4 Temperature drift with autocalibration is slightly better than without autocalibration Publication 1769 UM004A EN P NOTE input noise
16. Empty E mpty JEmpty Y Empty M Empty Empty x Empty Empty v List devices in the order that they reside in the physical bank from left to right Enter the first device at the top of the left column and continue down When the left column is full start at the top of the right column and continue Device include 1 0 Modules Power Supplies Cables and End Caps Cables should be entered only in the first bank in which they reside The 1769 ADN appears in slot 0 Your I O modules power supplies end cap and interconnect cables must be entered in the proper order following the 1769 I O rules contained in the 1769 ADN user s manual For simplicity sake we placed the 1769 IT6 in slot 1 to show how it is configured As a minimum a power supply and end cap must also be placed after the 1769 IT6 module even though they do not have a slot number associated with them To place the 1769 IT6 into Bank 1 click the arrow next to the first empty slot after the 1769 ADN A list of all possible 1769 products appears Select the 1769 IT6 Slot 1 appears to the right of the 1769 IT6 Click this Slot 1 box and the following 1769 IT6 configuration screen appears Configuring Your 1769 IT6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter G 5 1769 IT6 6 Channel ThermocoupleZmV Input 121 x Module Slot Position 1 1 0 Data Size Input Size E words Loo tact S
17. National Institute of Standards and Technology The ITS 90 1 3 is realized maintained and disseminated by NIST to provide a standard scale of temperature for use in science and industry in the United States This scale was adopted by the International Committee of Weights and Measures CIPM at its meeting in September 1989 and it became the official international temperature scale on January 1 1990 The ITS 90 supersedes the IPTS 68 75 2 and the 1976 Provisional 0 5 K to 30 Temperature Scale EPT 76 4 The adoption of the ITS 90 removed several deficiencies and limitations associated with IPTS 68 Temperatures on the ITS 90 are in closer agreement with thermodynamic values than were those of the IPTS 68 and EPT 76 Additionally improvements have been made in the non uniqueness and reproducibility of the temperature scale especially in the temperature range from t68 630 74 C to 1064 43 C where the type S thermocouple was the standard interpolating device on the IPTS 68 For additional technical information regarding ITS 90 refer to the NIST Monograph 175 This section discusses Platinum 30 percent Rhodium Alloy Versus Platinum 6 percent Rhodium Alloy thermocouples commonly called type B thermocouples This type is sometimes referred to by the nominal chemical composition of its thermoelements platinum 30 percent rhodium versus platinum 6 percent rhodium or 30 6 The positive BP thermoelement typically contains
18. Temperature Measurement in Science and Industry 3rd Int IMEKO Conf Sheffield Sept 1987 115 125 56 Burley N A N CLAD N A novel integrally sheathed thermocouple optimum design rationale for ultra high thermoelectric stability Temperature Its Measurement and Control in Science and Industry Vol Thermocouple Descriptions C 21 6 Schooley J ed New York American Institute of Physics 1992 579 584 57 Bentley R E The new nicrosil sheathed type N MIMS thermocouple an assessment of the first production batch Mater Australas 18 6 16 18 1986 58 Bentley R E Russell Nicrosil sheathed mineral insulated type N thermocouple probes for short term variable immersion applications to 1100 C Sensors and Actuators 16 89 100 1989 59 Bentley R E Irreversible thermoelectric changes in type K and type N thermocouple alloys within nicrosil sheathed MIMS cable J Phys D 22 1908 1915 1989 60 Bentley R E Thermoelectric behavior of Ni based ID MIMS thermocouples using the nicrosil plus sheathing alloy Temperature Its Measurement and Control in Science and Industry Vol 6 Schooley J F ed New York American Institute of Physics 1992 585 590 61 Bentley R E Thermoelectric hysteresis in nicrosil and nisil Pbys E Sci Instrum 20 1368 1373 1987 62 Bentley E Thermoelectric hysteresis in nickel based thermocouple alloys J Phys D 22 1902 1907 1989 Publicatio
19. These temperature limits apply to thermocouples used in conventional closed end protecting tubes and they are intended only as a rough guide to the user They do not apply to thermocouples having compacted mineral oxide insulation This section describes Nickel Chromium Silicon Alloy Versus Nickel Silicon Magnesium Alloy thermocouples commonly referred to as type N thermocouples This type is the newest of the letter designated thermocouples It offers higher thermoelectric stability in air above 1000 C and better air oxidation resistance than types E J and K thermocouples The positive thermoelement NP is an alloy that typically contains about 84 percent nickel 14 to 14 4 percent chromium 1 3 to 1 6 percent silicon plus small amounts usually not exceeding about 0 1 percent of other elements such as magnesium iron carbon and cobalt The negative thermoelement NN is an alloy that typically contains about 95 percent nickel 4 2 to 4 6 percent silicon 0 5 to 1 5 percent magnesium plus minor impurities of iron cobalt manganese and carbon totaling about 0 1 to 0 3 percent The type NP and NN alloys were known originally 16 as nicrosil and nisil respectively The research reported in NBS Monograph 161 showed that the type N thermocouple may be used down to liquid helium temperatures about 4K but that its Seebeck coefficient becomes very small below 20K Its Seebeck coefficient at 20K is about 2 54 V K roughly one third that of t
20. 2 1 0 0 8 0 6 0 4 0 2 3 5 2 5 0 200 400 600 800 Thermocouple Temperature C 1000 1200 1400 1600 1800 2000 2200 2400 500 1000 1500 2000 2500 3000 Thermocouple Temperature F 3500 4000 4500 Publication 1769 UMO004A EN P A 8 Specifications Publication 1769 UM004A EN P Accuracy C Accuracy F Figure A 4 Module Accuracy at 25 C 77 F Ambient forType C Thermocouple Using 250 500 and 1 kHz Filter 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Thermocouple Temperature C 80 70 60 50 40 30 20 500 1000 1500 2000 2500 3000 3500 4000 4500 Thermocouple Temperature F Specifications 9 Figure A5 Module Accuracy at 25 C 77 F Ambient for Type E Thermocouple Using 10 50 and 60 Hz Filter 4 5 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 400 200 0 200 400 600 800 1000 Thermocouple Temperature C 500 0 500 1000 1500 2000 Thermocouple Temperature F Publication 1769 UMO004A EN P A 10 Specifications Figure A 6 Module Accuracy at 25 C 77 F Ambient forType E Thermocouple Using 250 500 and 1 kHz Filter 60 50 40 30 Accuracy C 20 10 0 400 200 0 200 400 600 800 1000 Thermocouple Temperature Accuracy F 500 0 500 1000 1500 2000 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy C Accuracy F
21. 224 RP1278 1940 February 12 Sparks L L Powell R L Low temperatures thermocouples KP normal silver and copper versus Au 0 02 at Fe and Au 0 07 at 96 Fe J Res Natl Bur Stand U S 76A 3 263 283 1972 May June 13 Burley N A Hess R M Howie C F Coleman J A The nicrosil versus nisil thermocouple A critical comparison with the ANSI standard letter designated base metal thermocouples Temperature Its Measurement and Control in Science and Industry Vol 5 Schooley J F ed New York American Institute of Physics 1982 1159 1166 Thermocouple Descriptions C 17 14 Potts J F Jr McElroy D The effects of cold working heat treatment and oxidation on the thermal emf of nickel base thermoelements Herzfeld C M Brickwedde F G Dahl A I Hardy J D ed Temperature Its Measurement and Control in Science and Industry Vol 3 Part 2 New York Reinhold Publishing Corp 1962 243 264 15 Burley N A Ackland The stability of the thermo emf temperature characteristics of nickel base thermocouples Jour of Australian Inst of Metals 12 1 23 31 1967 16 Burley N A Nicrosil and nisil Highly stable nickel base alloys for thermocouples Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H ed Pittsburgh Instrument Society of America 1972 1677 1695 17 Wang T P Starr C D Electromotive force stability of nicr
22. 5 Thermocouple Descriptions C 7 percent silicon 1 to 2 3 percent aluminum 1 6 to 3 2 percent manganese up to about 0 5 percent cobalt and smaller amounts of other constituents such as iron copper and lead Also type KN thermoelements with modified compositions are available for use in special applications These include alloys in which the manganese and aluminum contents are reduced or eliminated while the silicon and cobalt contents are increased The low temperature research 8 by members of the NBS Cryogenics Division showed that the type K thermocouple may be used down to liquid helium temperatures about 4K but that its Seebeck coefficient becomes quite small below 20K Its Seebeck coefficient at 20K is only about 4uV K being roughly one half that of the type E thermocouple which is the most suitable of the letter designated thermocouples types for measurements down to 20K Type KP and type KN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures The thermoelectric homogeneity of type KN thermoelements however was found 8 to be not quite as good as that of type EN thermoelements Type K thermocouples are recommended by the ASTM 5 for use at temperatures within the range 250 C to 1260 C in oxidizing or inert atmospheres Both the KP and the KN thermoelements are subject to deterioration by oxidation when used in air above about 750 C but
23. 50 Hz e 60 Hz e 250 Hz e 500 Hz e 1000 Hz Hardware Features The module contains a removable terminal block Channels are wired as differential inputs Two cold junction compensation CJC sensors are attached to the terminal block to enable accurate readings from each channel These sensors compensate for offset voltages introduced into the input signal as a result of the cold junction where the thermocouple wires are connected to the module Module configuration is normally done via the controller s programming software In addition some controllers support configuration via the user program In either case the module configuration is stored in the memory of the controller Refer to your controller s user manual for more information Overview 1 3 The illustration below shows the module s hardware features 9H 8988883883898 Item Description bus lever upper panel mounting tab lower panel mounting tab module status LED module door with terminal identification label movable bus connector bus interface with female pins stationary bus connector bus interface with male pins nameplate label upper tongue and groove slots lower tongue and groove slots upper DIN rail latch lower DIN rail latch write on label for user identification tags removable terminal block RTB with finger safe cover RTB upper retaining scr
24. 6 thermocouple input channels are disabled by default To enable a channel click its Enable box so a check mark appears in it Then choose your Data Format Input Type Temperature Units Open Circuit Condition and Filter Frequency for each channel you are using See Channel Configuration on page 4 6 for a complete description of each of these configuration categories In this example channels 0 through 5 are being used All 6 channels have J type thermocouples connected A 60Hz Filter Frequency the default is used for all 6 channels along with receiving the thermocouple input data in Engineering Units x 10 We also chose F for the Temperature Units This selection coupled with choosing Engineering Units x 10 for the data format allows us to receive the data into the controllers tag database as actual temperature data in F The Open Circuit Detection is Upscale This means that if an open circuit condition should occur at any of the 6 Publication 1769 UM004A EN P 6 6 Configuring Your 1769 IT6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter thermocouple input channels the input value for that channel is the full scale value selected by the input type and data format We can therefore monitor each channel for full scale open circuit as well as monitor the Open Circuit bits in Input word 6 for each channel When complete the configuration screen looks like the following 1769 IT6 6 Channel Thermocouple m
25. 720V dc for 1 minute qualification test 30V ac 30V dc working voltage Input Channel Configuration via configuration software screen or the user program by writing a unique bit pattern into the module s configuration file Refer to your controller s user manual to determine if user program configuration is supported Module OK LED Channel Diagnostics On module has power has passed internal diagnostics and is communicating over the bus Off Any of the above is not true Over or under range and open circuit by bit reporting Vendor 1 0 Code Product Type Code 1 10 Product Code 36 1 Maximum current input is limited due to input impedance Input Type Thermocouple J Thermocouple 110 to 1300 C 166 F to 2372 F Repeatability for 10 Hz Filter 0 1 C 0 18 F 0 1 C 0 18 F Thermocouple N 210 C to Thermocouple T 170 C to 400 C 274 F to 752 F 110 C 346 F to 166 F 0 25 C 0 45 F 0 1 C 0 18 F Thermocouple T 270 C to 170 C 454 F to 274 F x1 5 C 2 7 F Thermocouple 270 C to 1370 C 454 F to 42498 F 0 1 C 0 18 F Thermocouple 270 C to 170 C 454 F to 274 F 2 0 C 3 6 F Thermocouple E 220 to 1000 C 364 F to 1832 0 1 C 0 18 F Thermocouple E 270 C to 220 C 454 F to 364 F 1 0 C 1 8 F T
26. 73 23 EEC Low Voltage by applying the safety requirements of EN 61131 2 Programmable Controllers Part 2 Equipment Requirements and Tests For specific information required by EN61131 2 see the appropriate sections in this publication as well as the following Allen Bradley publications e Industrial Automation Wiring and Grounding Guidelines for Noise Immunity publication 1770 4 1 e Automation Systems Catalog publication B113 Publication 1769 UM004A EN P 3 2 Installation and Wiring Power Requirements General Considerations Publication 1769 UM004A EN P The module receives power through the bus interface from the 5V dc 24V dc system power supply The maximum current drawn by the module is shown in the table below Module Current Draw at 5V dc at 24V dc 100 mA 40 mA Compact I O is suitable for use in an industrial environment when installed in accordance with these instructions Specifically this equipment is intended for use in clean dry environments Pollution degree 2 and to circuits not exceeding Over Voltage Category 60664 1 Hazardous Location Considerations This equipment is suitable for use in Class I Division 2 Groups A B C D or non hazardous locations only The following WARNING statement applies to use in hazardous locations WARNING e EXPLOSION HAZARD e Substitution of components may impair suitability for Class I Division 2 Do not replace co
27. Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type T commercial thermocouples be 1 C or 0 75 percent whichever is greater between 0 C and 350 C and 1 or 1 5 percent whichever is greater between 200 C and 0 C Type T thermocouples can also be supplied to meet special tolerances which are equal to approximately one half the standard tolerances given above Type T thermocouple materials are normally supplied to meet the tolerances specified for temperatures above 0 However the same materials may not satisfy the tolerances specified for the 200 C to 0 range If materials are required to meet the tolerances below 0 this should be specified when they are purchased The suggested upper temperature limit of 370 C given in the ASTM standard 7 for protected type T thermocouples applies to AWG 14 1 63 mm wire It decreases to 260 C for AWG 20 0 81 mm 200 C for AWG 24 or 28 0 51 mm or 0 33 mm and 150 C for AWG 30 0 25 mm These temperature limits apply to thermocouples used in conventional closed end protecting tubes and they are intended only as a rough guide to the user They do not apply to thermocouples having compacted mineral oxide insulation Publication 1769 UM004A EN P C 16 Thermocouple Descriptions References Publication 1769 UM004A EN P 1 Preston Thomas The International Temperature Scale of 1990 TITS 90 Metrologia 27 3 10 1990 ibid p
28. Cancel First select the Comm Format Input Data INT for the 1769 IT6 then fill in the name field For this example is used to help identify the module type in the Controller Organizer The Description field is optional and may be used to provide more details concerning this I O module in your application The slot number must be selected next although it will begin with the first available slot number 1 and increments automatically for each subsequent Generic Profile you configure For this example the 1769 IT6 Thermocouple module is located in slot 1 The Comm Format Assembly Instance and Size values are listed in the following table for the 1769 IT6 Thermocouple module 1769 1 0 Comm Format Parameter Assembly Size Module Instance 16 bit 6 Input Data INT Input 101 8 Output 104 0 Config 102 8 Enter the Assembly Instance numbers and their associated sizes for the 1769 IT6 module into the Generic Profile When complete the Generic Profile for a 1769 IT6 module should look like the following Publication 1769 UM004A EN P F 4 Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers RSLogix 5000 Configuring 1 0 Modules Publication 1769 UM004A EN P Module Properties Local 1769 MODULE 1 1 x Type 1769 MODULE Generic 1753 Module Parent Local Connection Parameters Assembly Instance Size Name ITE Input p
29. Ch 1 Data Acquisition 112 ms 71 ms 112 ms 71 ms 53 ms 53 ms 53 ms 53 ms 183 ms 183 ms 183 ms 212 ms 761 ms Publication 1769 UM004A EN P 4 38 Data Status and Channel Configuration Publication 1769 UM004A EN P Chapter 5 Safety Considerations Diagnostics and Troubleshooting This chapter describes troubleshooting the thermocouple mV input module This chapter contains information on e safety considerations while troubleshooting e internal diagnostics during module operation e module errors e contacting Rockwell Automation for technical assistance Safety considerations are an important element of proper troubleshooting procedures Actively thinking about the safety of yourself and others as well as the condition of your equipment is of primary importance The following sections describe several safety concerns you should be aware of when troubleshooting your control system ATTENTION Never reach into a machine to actuate a switch because unexpected motion can occur and cause injury Remove all electrical power at the main power disconnect switches before checking electrical connections or inputs outputs causing machine motion Indicator Lights When the green LED on the module is illuminated it indicates that power is applied to the module and that it has passed its internal tests Stand Clear of Equipment When troubleshooting any system problem have all pe
30. Fan K Wu S New reference functions for platinum 1096 rhodium versus platinum type S thermocouples based on the ITS 90 Part I and Part II in Temperature Its Measurement and Control in Science and Industry Vol 6 Schooley J F ed New York American Institute of Physics 1992 537 546 29 Bentley R E Changes in Seebeck coefficient of Pt and Pt 1096 Rh after use to 1700C in high purity polycrystalline alumina Int J Thermophys 6 1 83 99 1985 30 McLaren E H Murdock E New considerations on the preparation properties and limitations of the standard thermocouple for thermometry Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H ed Pittsburgh Instrument Society of America 1972 1543 1560 31 McLaren E H Murdock E G The properties of Pt PtRh thermocouples for thermometry in the range 0 1100 C I Basic measurements with standard thermocouples National Research Council of Canada Publication APH 2212 NRCC 17407 1979 32 McLaren E H Murdock E The properties of Pt PtRh thermocouples for thermometry in the range 0 1100 C Effect of heat treatment on standard thermocouples National Researcb Council of Canada Publication APH 2213 NRCC 17408 1979 Thermocouple Descriptions C 19 33 McLaren E H Murdock E G Properties of some noble and base metal thermocouples at fixed points in the range 0 1100 C Temperature Its Measurement and Control
31. For more detailed accuracy and drift information see the accuracy graphs on pages A 5 through A 21 and the temperature drift graphs on pages A 23 through A 27 Accuracy F Specifications 5 Accuracy Versus Thermocouple Temperature and Filter Frequency The following graphs show the module s accuracy when operating at 25 C for each thermocouple type over the thermocouple s temperature range for each frequency The effect of errors in cold junction compensation is not included Figure A 1 Module Accuracy at 25 C 77 F Ambient for Type B Thermocouple Using 10 50 and 60 Hz Filter 3 0 2 5 2 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Thermocouple Temperature 500 1000 1500 2000 2500 3000 3500 Thermocouple Temperature F Publication 1769 UMO004A EN P 6 Specifications Figure A 2 Module Accuracy at 25 77 Ambient forType B Thermocouple Using 250 500 and 1 kHz Filter 100 90 80 70 60 50 40 30 20 Accuracy 200 400 600 800 1000 1200 1400 1600 1800 2000 Thermocouple Temperature 200 180 160 140 120 100 80 60 40 20 Accuracy F 500 1000 1500 2000 2500 3000 3500 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy C Accuracy F Specifications 7 Figure A 3 Module Accuracy at 25 C 77 F Ambient for Type C Thermocouple Using 10 50 and 60 Hz Filter 2 0 1 8 1 6 14 1
32. Input Data Channel 4 5 Analog Input Data Channel 5 6 0C7 OC6 OC5 0 4 0C2 OC1 OCO 57 56 55 S4 S3 52 81 50 7 U0 00 Ul 01 U2 02 U3 03 U4 04 U5 05 UB 06 U7 07 1 Changing bit values is not supported by all controllers Refer to your controller manual for details Input Data Values Data words 0 through 5 correspond to channels 0 through 5 and contain the converted analog input data from the input device The most significant bit bit 15 is the sign bit SGN General Status Bits 0 to S7 Bits SO through S5 of word 6 contain the general status information for channels 0 through 5 respectively Bits S6 and S7 contain general status information for the two CJC sensors S6 corresponds to S7 to CJC1 If set 1 these bits indicate an error over or under range open circuit or input data not valid condition associated with that channel The data not valid condition is described below Publication 1769 UM004A EN P Module Data Status and Channel Configuration 4 3 Input Data Not Valid Condition The general status bits SO to S5 also indicate whether or not the input data for a particular channel 0 through 5 is being properly converted valid by the module This invalid data condition can occur bit set when the download of a new configuration to a channel is accepted by the module proper configuration but before
33. Specifications 11 Figure A 7 Module Accuracy at 25 C 77 F Ambient for Type J Thermocouple Using 10 50 and 60 Hz Filter 0 6 0 5 0 4 0 3 0 2 0 1 0 400 200 0 200 400 600 800 1000 1200 Thermocouple Temperature C 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 400 0 400 800 1200 1600 2000 Thermocouple Temperature F Publication 1769 UM004A EN P A 12 Specifications Figure A 8 Module Accuracy at 25 C 77 F Ambient forType J Thermocouple Using 250 500 and 1 kHz Filter 30 25 20 Accuracy C a 0 400 200 0 200 400 600 800 1000 1200 Thermocouple Temperature C Accuracy F 400 0 400 800 1200 1600 2000 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy F Specifications 13 Figure 9 Module Accuracy at 25 C 77 F Ambient for Type Thermocouple Using 10 50 and 60 Hz Filter 1 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C 500 0 500 1000 1500 2000 2500 Thermocouple Temperature F Publication 1769 UMO004A EN P A 14 Specifications Figure A 10 Module Accuracy at 25 C 77 F Ambient forType K Thermocouple Using 250 500 and 1 kHz Filter 80 70 60 50 40 Accuracy C 30 20 10 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C 140 120 100 80 Accuracy F 60 40 20 500 0 5
34. UM004A EN P 4 20 Module Data Status and Channel Configuration Figure 4 7 Effective Resolution Versus Input Filter Selection for Type E Thermocouples Using 250 500 and 1k Hz Filters 90 80 70 60 50 40 30 Effective Resolution 20 10 0 400 200 0 200 400 600 800 1000 160 140 120 100 80 60 Effective Resolution F 40 20 500 0 500 1000 1500 2000 Temperature F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F Module Data Status and Channel Configuration 4 21 Figure 4 8 Effective Resolution Versus Input Filter Selection for Type J Thermocouples Using 10 50 and 60 Hz Filters 0 5 0 4 0 3 0 2 0 1 300 200 700 1200 Temperature C 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 400 0 400 800 1200 1600 2000 Temperature F Publication 1769 UM004A EN P 4 22 Module Data Status and Channel Configuration Figure 4 9 Effective Resolution Versus Input Filter Selection for Type J Thermocouples Using 250 500 and 1k Hz Filters 60 50 40 30 Effective Resolution 20 300 200 700 1200 Temperature 100 90 80 70 60 50 40 30 20 Effective Resolution F 400 0 400 800 1200 1600 2000 Temperature F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F Module Data Status and Channel Configura
35. X412 010 000010010 Invalid input format selected channel 5 X413 010 000010011 An unused bit has been set for channel 0 X414 010 000010100 An unused bit has been set for channel 1 X415 010 000010101 An unused bit has been set for channel 2 X416 010 000010110 An unused bit has been set for channel 3 X417 010 000010111 An unused bit has been set for channel 4 X418 010 0 0001 1000 unused bit has been set for channel 5 X419 010 0 0001 1001 Invalid module configuration register t Publication 1769 UM004A EN P 5 8 Diagnostics and Troubleshooting Module Inhibit Function Some controllers support the module inhibit function See your controller manual for details Whenever the 1769 IT6 module is inhibited the module continues to provide information about changes at its inputs to the 1769 CompactBus master for example a CompactLogix controller Contacting Rockwell If you need to contact Rockwell Automation for assistance please have Automation the following information available when you call e a clear statement of the problem including a description of what the system is actually doing Note the LED state also note data and configuration words for the module a list of remedies you have already tried e processor type and firmware number See the label on the processor e hardware types in the system including all I O modules e fault code if the processor is faulted Publication 1769 UM004A EN P
36. analog input values for a device gain drift Change in full scale transition voltage measured over the operating temperature range of the module input data scaling Data scaling that depends on the data format selected for a channel configuration word Scaling is selected to fit the temperature or voltage resolution for your application input image The input from the module to the controller The input image contains the module data words and status bits linearity error Any deviation of the converted input or actual output from a straight line of values representing the ideal analog input An analog input is composed of a series of input values corresponding to digital codes For an ideal analog input the values lie in a straight line spaced by inputs corresponding to 1 LSB Linearity is expressed in percent Glossary 3 full scale input See the variation from the straight line due to linearity error exaggerated in the example below Actual Transfer Function LSB Least significant bit The LSB represents the smallest value within a string of bits For analog modules 16 bit two s complement binary codes are used in the I O image For analog inputs the LSB is defined as the rightmost bit of the 16 bit field bit 0 The weight of the LSB value is defined as the full scale range divided by the resolution module scan time same as module update time module update time The time required for the mo
37. and order support e product technical training e warranty support e support service agreement Technical Product Assistance If you need to contact Rockwell Automation for technical assistance please review the information in Chapter Chapter 5 Diagnostics and Troublesbooting first Then call your local Rockwell Automation representative Your Questions or Comments on the Manual If you find a problem with this manual please notify us If you have any suggestions for how this manual could be made more useful to you please contact us at the address below Rockwell Automation Automation Control and Information Group Technical Communication Dept A602V P O Box 2086 Milwaukee WI 53201 2086 Publication 1769 UM004A EN P Publication 1769 UM004A EN P Chapter 1 General Description Overview This chapter describes the 1769 IT6 Thermocouple mV Input Module and explains how the module reads thermocouple or millivolt analog input data Included is information about e the module s hardware and diagnostic features e an overview of system and module operation e compatibility The thermocouple mV input module supports thermocouple and millivolt signal measurement It digitally converts and stores thermocouple and or millivolt analog data from any combination of up to six thermocouple or millivolt analog sensors Each input channel is individually configurable via software for a specific input device data format and filter
38. commercial thermocouples be 1 5 or 0 25 percent whichever is greater between 0 C and 1450 C Type S thermocouples can be supplied to meet special tolerances of 0 6 or 0 1 percent whichever is greater The suggested upper temperature limit 1480 C given in the ASTM standard 7 for protected type S thermocouples applies to AWG 24 0 51 mm wire This temperature limit applies to thermocouples used in conventional closed end protecting tubes and it is intended only as a rough guide to the user It does not apply to thermocouples having compacted mineral oxide insulation This section describes Copper Versus Copper Nickel Alloy thermocouples called type T thermocouples This type is one of the oldest and most popular thermocouples for determining temperatures within the range from about 370 C down to the triple point of neon 248 5939 C Its positive thermoelement TP is typically copper of high electrical conductivity and low oxygen content that conforms to ASTM Specification Publication 1769 UM004A EN P C 14 Thermocouple Descriptions Publication 1769 UM004A EN P B3 for soft or annealed bare copper wire Such material is about 99 95 percent pure copper with an oxygen content varying from 0 02 to 0 07 percent depending upon sulfur content and with other impurities totaling about 0 01 percent Above about 200 C the thermoelectric properties of type TP thermoelements which satisfy the above conditions are except
39. engineering temperature units provided by the module to the controller The raw proportional counts scaled for PID and percent of full scale data formats may yield the highest effective resolutions but may also require that you convert channel data to real engineering units in your control program Raw Proportional Data The value presented to the controller is proportional to the selected input and scaled into the maximum data range allowed by the bit resolution of the A D converter and filter selected The raw proportional data format also provides the best resolution of all the data formats If you select the raw proportional data format for a channel the data word will be a number between 32767 and 32767 For example if a type J thermocouple is selected the lowest temperature of 210 C corresponds to 32767 counts The highest temperature of 1200 C corresponds to 32767 See Determining Effective Resolution and Range on page 4 14 Engineering Units x 1 When using this data format for a thermocouple or millivolt input the module scales the thermocouple or millivolt input data to the actual engineering values for the selected millivolt input or thermocouple type It expresses temperatures in 0 1 C or 0 1 F units For millivolt inputs the module expresses voltages in 0 01 mV units NOTE Use the engineering units x 10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit The resolution of the eng
40. even so type K thermocouples may be used at temperatures up to about 1350 C for short periods with only small changes in calibration When oxidation occurs it normally leads to a gradual increase in the thermoelectric voltage with time The magnitude of the change in the thermoelectric voltage and the physical life of the thermocouple will depend upon such factors as the temperature the time at temperature the diameter of the thermoelements and the conditions of use The ASTM Manual 5 indicates that type K thermocouples should not be used at high temperatures in sulfurous reducing or alternately oxidizing and reducing atmospheres unless suitably protected with protecting tubes They also should not be used in vacuum at high temperatures for extended times because the chromium in the positive thermoelement a nickel chromium alloy vaporizes out of solution and alters the calibration In addition avoid their use in atmospheres that promote green rot corrosion 9 of the positive thermoelement Such corrosion results from the preferential oxidation of chromium in atmospheres with low but not negligible oxygen content and can lead to a large decrease in the thermoelectric voltage of the thermocouple with time The effect is most serious at temperatures between 800 C and 1050 C Both thermoelements of type K thermocouples are reasonably stable thermoelectrically under neutron irradiation since the resulting changes in their chemic
41. frequency and provides open circuit over range and under range detection and indication Thermocouple mV Inputs and Ranges The table below defines thermocouple types and their associated full scale temperature ranges The second table lists the millivolt analog input signal ranges that each channel will support To determine the practical temperature range your thermocouple supports see the specifications in Appendix A Thermocouple Type C Temperature Range F Temperature Range J 210 to 1200 C 346 to 2192 F K 270 to 1370 C 454 to 2498 F T 270 to 400 C 454 to 752 F E 270 to 1000 C 454 to 1832 F R 0 to 1768 C 32 to 3214 F S 0 to 1768 C 32 to 3214 F B 300 to 1820 C 572 to 3308 F N 210 to 1300 C 346 to 2372 F 0 to 2315 C 32 to 4199 F CJC Sensor 0 to 85 C 32 to 185 F Millivolt InputType Range 50 mV 50 to 50 mV 100 mV 100 to 100 mV Publication 1769 UM004A EN P 1 2 Overview Publication 1769 UM004A EN P Data Formats The data can be configured on board each module as e engineering units x 1 e engineering units x 10 e scaled for PID e percent of full scale e raw proportional data Filter Frequencies The module uses a digital filter that provides high frequency noise rejection for the input signals The filter is programmable allowing you to select from six different filter frequencies for each channel e 10 Hz e
42. in Science and Industry Vol 5 Schooley J ed New York American Institute of Physics 1982 953 975 34 Bentley R E Jones T P Inhomogeneities in type S thermocouples when used to 1064 C High Temperatures High Pressures 12 33 45 1980 35 Rhys D W Taimsalu P Effect of alloying additions on the thermoelectric properties of platinum Engelhard Tech Bull 10 41 47 1969 36 Cochrane J Relationship of chemical composition to the electrical properties of platinum Engelhard Tech Bull 11 58 71 1969 Also in Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H H ed Pittsburgh Instrument Society of America 1972 1619 1632 37 Aliotta J Effects of impurities on the thermoelectric properties of platinum Inst and Control Systems 106 107 March 1972 38 Burns W Gallagher J S Reference tables for the Pt 30 percent Rh versus Pt 6 percent Rh thermocouple Res Natl Bur Stand U S 70C 89 125 1966 39 Ehringer H Uber die lebensdauer von PtRh thermoelementen Metall 8 596 598 1954 40 Acken J S Some properties of platinum rhodium alloys J Res Natl Bur Stand U S 12 249 RP650 1934 41 Hendricks J W McElroy D L High temperature high vacuum thermocouple drift tests Environmental Quarterly 34 38 March 1967 42 Zysk E D Platinum metal thermocouples Temperature Its Measurement and Control in Science and Ind
43. information on installing CompactLogix User Manual 1769 UM007B EN P using and programming CompactLogix controllers In depth information on grounding and wiring Allen Bradley Programmable Controller Grounding and 1770 4 1 Allen Bradley programmable controllers Wiring Guidelines If you would like a manual you can e download a free electronic version from the internet at www theautomationbookstore com e purchase a printed manual by contacting your local distributor or Rockwell Automation representative visiting www theautomationbookstore com and placing your order calling 1 800 963 9548 USA Canada or 001 330 725 1574 Outside USA Canada Conventions Used in The following conventions are used throughout this manual This Manual e Bulleted lists like this one provide information not procedural steps e Numbered lists provide sequential steps or hierarchical information e Italic type is used for emphasis e Text in this font indicates words or phrases you should type Publication 1769 UM004A EN P Rockwell Automation Support P 3 Rockwell Automation offers support services worldwide with over 75 Sales Support Offices 512 authorized distributors and 260 authorized Systems Integrators located throughout the United States alone plus Rockwell Automation representatives in every major country in the world Local Product Support Contact your local Rockwell Automation representative for e sales
44. is set in the channel status word The channel status word is described in Input Data File on page 4 2 Using the module image table the controller reads the two s complement binary converted thermocouple or millivolt data from the module This typically occurs at the end of the program scan or when commanded by the control program If the controller and the module determine that the data transfer has been made without error the data is used in the control program Module Operation When the module receives a differential input from an analog device the module s circuitry multiplexes the input into an A D converter The converter reads the signal and converts it as required for the type of input The module also continuously samples the CJC sensors and compensates for temperature changes at the terminal block cold junction between the thermocouple wire and the input channel See the block diagram on page 1 5 16 pin Backplane Overview 1 5 Controller Connector 18 pin Terminal Block 1769 Bus opu Module ASIC couplers Data 3 Microprocessor Module Status 6 Differential Input Thermocouple mV Protection Inputs Converter Itipl Circuitry Circuits CJC Sensors Module Configuration 5V 415V GND 15V Data 24V dc Isolated Power Suppl 24V GND E Each channel can receive input signals from a thermocouple or millivolt analog input device depending upon how you configured the channel W
45. minutes See Selecting Enable Disable Cyclic Calibration Word 6 Bit 0 on page 4 14 To maintain optimal system accuracy periodically perform an autocalibration cycle IMPORTANT The module does not convert input data while the calibration cycle is in progress following a change in configuration Module scan times are increased by up to 112 ms during cyclic autocalibration Chapter Module Data Status and Channel Configuration After installing the 1769 IT6 thermocouple mV input module you must configure it for operation usually using the programming software compatible with the controller for example RSLogix 500 or RSLogix 5000 Once configuration is complete and reflected in the ladder logic you need to operate the module and verify its configuration This chapter contains information on the following e module memory map e accessing input image file data e configuring channels e determining effective resolution and range e determining module update time Module Memory Map The module uses eight input words for data and status bits input image and seven configuration words Input Image 8 words Input Image File Configuration File 7 words Configuration File NOTE Memory Map Word 0 Word Word 2 Word 3 Word 4 Word 5 Word Word gt ee JNJN I Channel 0 Configuration Word Word 0 Channel 1 Configuration Word Word 1 Channel 2 Config
46. right position 3 Use the upper and lower tongue and groove slots 1 to secure the modules together Cor to a controller 4 Move the module back along the tongue and groove slots until the bus connectors 2 line up with each other 5 Push the bus lever back slightly to clear the positioning tab 3 Use your fingers or a small screwdriver 6 To allow communication between the controller and module move the bus lever fully to the left 4 until it clicks Ensure it is locked firmly in place ATTENTION u When attaching I O modules it is very important that the bus connectors are securely locked together to ensure proper electrical connection 7 Attach an end cap terminator 5 to the last module in the system by using the tongue and groove slots as before 8 Lock the end cap bus terminator 6 1760 or 1769 ECL right or left end cap respectively must be used to terminate the end of the bus Publication 1769 UM004A EN P 3 6 Installation and Wiring Mounting Publication 1769 UM004A EN P ATTENTION During panel or DIN rail mounting of all devices be sure that all debris metal chips wire strands etc is kept from falling into the module Debris that falls into the module could cause damage at power up Minimum Spacing Maintain spacing from enclosure walls wireways adjacent equipment etc Allow 50 mm 2 in of space on all sides for adequate ventilation as shown be
47. showed substantially less instability above 1000 C than those sheathed in stainless steel Bentley and Morgan 52 stressed the importance of using Inconel sheathing with a very low manganese content to achieve the most stable performance The use of special Ni Cr based alloys for sheathing to improve the chemical and physical compatibility with the thermoelements also has been investigated by Burley 54 56 and by Bentley 57 60 Neither thermoelement of a type N thermocouple is extremely sensitive to minor differences in heat treatment provided that the treatment does not Publication 1769 UM004A EN P C 10 Thermocouple Descriptions Type R Thermocouples Publication 1769 UM004A EN P violate any of the restrictions mentioned above For most general applications they may be used with the heat treatment routinely given by the wire manufacturer Bentley 61 62 however has reported reversible changes in the Seebeck coefficient of type NP and NN thermoelements when heated at temperatures between 200 C and 1000 C These impose limitations on the accuracy obtainable with type N thermocouples The magnitude of such changes was found to depend on the source of the thermoelements Consequently when the highest accuracy and stability are sought selective testing of materials as well as special preparatory heat treatments beyond those given by the manufacturer will usually be necessary Bentley s articles 61 62 should be consulted for gui
48. temperatures up to about 1700 C with only small changes in calibration The maximum temperature limit for the thermocouple is governed primarily by the melting point of the Pt 6 percent rhodium thermoelement which is estimated to be about 1820 C by Acken 40 The thermocouple is most reliable when used in a clean oxidizing atmosphere air but also has been used successfully in neutral atmospheres or vacuum by Walker et al 25 26 Hendricks and McElroy 41 and Glawe and Szaniszlo 24 The stability of the thermocouple at high temperatures has been shown by Walker et al 25 26 to depend primarily on the quality of the materials used for protecting and insulating the thermocouple High purity alumina with low iron content appears to be the most suitable material for the purpose Type B thermocouples should not be used in reducing atmospheres nor those containing deleterious vapors or other contaminants that are reactive with the platinum group metals 42 unless suitably protected with nonmetallic protecting tubes They should never be used in metallic protecting tubes at high temperatures The Seebeck coefficient of type B thermocouples decreases with decreasing temperature below about 1600 C and becomes almost negligible at room temperature Consequently in most applications the reference junction temperature of the thermocouple does not need to be controlled or even known as long as it between 0 and 50 C For example the volt
49. the Analog Input Configuration screen in a raw data format You have the option of entering the configuration using this tab instead of the configuration tabs You do not have to enter data in both places Publication 1769 UM004A EN P Appendix F Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 The procedure in this example is used only when your 1769 IT6 Thermocouple module profile is not available in RSLogix 5000 Programming Software The initial release of the CompactLogix5320 controller includes the 1769 Generic I O Profile with individual 1769 I O module profiles to follow To configure a 1769 IT6 Thermocouple module for a CompactLogix Controller using RSLogix 5000 with the 1769 Generic Profile begin a new project in RSLogix 5000 Click on the new project icon or on the FILE pull down menu and select NEW The following screen appears New Controller x Vendor Allen Bradley Type 17694 20 CompactLogix 5320 Controller Name Cancel Description Help H Shassi an none 0 E Revision 4 Create In C RSLogix 5000 Projects Browse Choose your controller type and enter a name for your project then click OK The following main RSLogix 5000 screen appears Publication 1769 UM004A EN P 2 Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 Publication 1769 UM004A EN P Ni z
50. the disconnected module forward If you feel excessive resistance check that the module has been disconnected from the bus and that both mounting screws have been removed or DIN latches opened It may be necessary to rock the module slightly from front to back to remove it or in a panel mounted system to loosen the screws of adjacent modules Before installing the replacement module be sure that the bus lever on the module to be installed and on the right side adjacent module or end cap are in the unlocked fully right position 7 Slide the replacement module into the open slot Connect the modules together by locking fully left the bus levers on the replacement module and the right side adjacent module Replace the mounting screws or snap the module onto the DIN raiD System Wiring Guidelines Consider the following when wiring your system General Power and input wiring must be in accordance with Class 1 Division 2 wiring methods Article 501 4 b of the National Electric Code NFPA 70 and in accordance with the authority having jurisdiction e Channels are isolated from one another by 10 Vdc maximum Route field wiring away from any other wiring and as far as possible from sources of electrical noise such as motors transformers contactors and ac devices As a general rule allow at least 15 2 cm 6 in of separation for every 120V of power Routing field wiring in a grounde
51. 0 50 0 1000 1500 2000 2500 3000 3500 Temperature F Effective Resolution F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F 1 0 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 1 1 8 1 6 1 4 1 2 1 0 0 8 0 6 0 4 0 2 Module Data Status and Channel Configuration 4 17 Figure 4 4 Effective Resolution Versus Input Filter Selection for Type C Thermocouples Using 10 50 and 60 Hz Filters 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Temperature C 500 1000 1500 2000 2500 3000 3500 4000 4500 Temperature F Publication 1769 UMO004A EN P 4 18 Module Data Status and Channel Configuration Figure 4 5 Effective Resolution Versus Input Filter Selection for Type C Thermocouples Using 250 500 and 1k Hz Filters Effective Resolution 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Temperature 160 140 120 100 80 60 Effective Resolution F 40 20 500 1000 1500 2000 2500 3000 3500 4000 4500 Temperature F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F Module Data Status and Channel Configuration 4 19 Figure 4 6 Effective Resolution Versus Input Filter Selection for Type E Thermocouples Using 10 50 and 60 Hz Filters 0 400 200 0 200 400 600 800 1000 Temperature C 500 0 500 1000 1500 2000 Temperature F Publication 1769
52. 00 C by using a single length of twin bore tubing to insulate the thermoelements and that contamination of the thermocouple by impurities transferred from the alumina insulator can be reduced by heat treating the insulator prior to its use McLaren and Murdock 30 33 and Bentley and Jones 34 thoroughly studied the performance of type 5 thermocouples in the range 0 C to 1100 C They described how thermally reversible effects such as quenched in point defects mechanical stresses and preferential oxidation of rhodium in the type SP thermoelement cause chemical and physical inhomogeneities in the thermocouple and thereby limit its accuracy in this range They emphasized the important of annealing techniques The positive thermoelement is unstable in a thermal neutron flux because the rhodium converts to palladium The negative thermoelement is relatively stable to neutron transmutation Fast neutron bombardment however will cause physical damage which will change the thermoelectric voltage unless it is annealed out At the gold freezing point temperature 1064 18 C the thermoelectric voltage of type S thermocouples increases by about 340uV about 3 percent per weight percent increase in rhodium content the Seebeck coefficient increases by about 4 percent per weight percent increase at the same temperature ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type S
53. 00 1000 1500 2000 2500 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy C Accuracy F Specifications 15 Figure A 11 Module Accuracy at 25 C 77 F Ambient for Type N Thermocouple Using 10 50 and 60 Hz Filter 0 8 0 6 0 4 0 2 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C 2 2 2 0 1 8 1 6 1 4 1 2 1 0 0 8 0 6 0 4 0 2 400 0 400 800 1200 1600 2000 2400 Thermocouple Temperature F Publication 1769 UM004A EN P A 16 Specifications Figure A 12 Module Accuracy at 25 C 77 F Ambient forType N Thermocouple Using 250 500 and 1 kHz Filter 60 50 40 30 Accuracy C 20 10 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C 100 90 80 70 60 50 40 30 20 Accuracy F 400 0 400 800 1200 1600 2000 2400 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy C Accuracy F Specifications 17 Figure A 13 Module Accuracy at 25 C 77 F Ambient for Thermocouple Using 10 50 and 60 Hz Filter 1 8 1 6 14 1 2 1 0 0 8 0 6 0 4 0 2 3 5 2 5 200 400 600 800 1000 1200 Thermocouple Temperature 1400 1600 1800 500 1000 1500 2000 Thermocouple Temperature F 2500 3000 Publication 1769 UM004A EN P A 18 Specifications Figure A 14 Module Accuracy at 25 C 77 F Ambient forType R Thermocouple
54. 000 K 2700 to 413700 4540 24980 270 to 1370 454 to 2498 0 to 16383 32767 to 32767 0 to 10000 T 2700 to 4000 4540 to 7520 270 to 400 454 to 752 0 to 16383 32767 to 32767 0 to 10000 E 2700 to 10000 4540 to 18320 270 to 1000 454 to 1832 0 to 16383 32767 to 32767 0 to 10000 R 0 to 17680 320 to 32140 0 to 1768 32 to 3214 0 to 16383 32767 to 32767 0 to 10000 S 0 to 17680 320 to 32140 0 to 41768 32 to 3214 0 to 16383 32767 to 32767 0 to 10000 B 3000 to 18200 45779 to 32767 300 to 1820 572 to 3308 0 to 16383 32767 to 32767 0 to 10000 N 2100 to 13000 3460 to 23720 210 to 1300 346 to 2372 0 to 16383 32767 to 32767 0 to 10000 C 0 to 23150 4320 to 32767 Oto 2315 32 to 4199 0 to 16383 32767 to 32767 0 to 10000 50 mV 5000 to 450002 500 to 50002 0 to 416383 32767 to 32767 0 to 10000 100 mV 10000 to 100002 1000 to 1000 0 to 416383 32767 to 432767 0 to 410000 1 Type B and C thermocouples cannot be represented in engineering units x1 F above 3276 7 F therefore it will be treated as an over range error 2 When mi livolts are selected the temperature setting is ignored Analog input date is the same for C or F selection Publication 1769 UM004A EN P 4 8 Data Status and Channel Configuration Publication 1769 UM004A EN P The engineering units data formats represent real
55. 29 60 0 2 percent rhodium and the negative BN thermoelement usually contains 6 12 0 02 percent rhodium The effect of differences in rhodium content are described later in this section An industrial consensus standard 21 CASTM E1159 87 specifies that rhodium having a purity of 99 98 percent shall be alloyed with platinum of 99 99 percent purity to produce the thermoelements This consensus standard 21 describes the purity of commercial type B materials that are used in many industrial thermometry applications that meet the calibration tolerances described later in this section Both thermoelements will typically have significant impurities of elements such as palladium iridium iron and silicon 38 Publication 1769 UM004A EN P C 2 Thermocouple Descriptions Publication 1769 UM004A EN P Studies by Ehringer 39 Walker et al 25 26 and Glawe and Szaniszlo 24 have demonstrated that thermocouples in which both legs are platinum rhodium alloys are suitable for reliable temperature measurements at high temperatures Such thermocouples have been shown to offer the following distinct advantages over types and S thermocouples at high temperatures 1 improved stability 2 increased mechanical strength and 3 higher operating temperatures The research by Burns and Gallagher 38 indicated that the 30 6 thermocouple can be used intermittently for several hours up to 1790 C and continuously for several hundred hours at
56. 300 Y 65 5 Hz Frequency Hz 1000 Hz Input Filter Frequency 0 3 20 40 60 Lo 80 eo S 40 E o 120 d 140 160 180 200 0 1K 2K 3K AK 5k ek 262 Hz Frequency Hz The cut off frequency for each channel is defined by its filter frequency selection Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency The cut off frequency should not be confused with the update time The cut off frequency relates to how the digital filter attenuates frequency components of the input signal Publication 1769 UM004A EN P 4 14 Module Data Status and Channel Configuration Determining Effective Resolution and Range Publication 1769 UM004A EN P The update time defines the rate at which an input channel is scanned and its channel data word is updated Selecting Enable Disable Cyclic Calibration Word 6 Bit 0 Cyclic calibration functions to reduce offset and gain drift errors due to temperature changes within the module By setting word 6 bit 0 to 0 you can configure the module to perform calibration on all enabled channels Setting this bit to 1 disables cyclic calibration You can program the calibration cycle to occur whenever you desire for systems that allow modifications to the state of this bit via the ladder program When the calibration function is enabled bit 0 a calibration cycle occurs once for all enabled channels If the function remains
57. 400 200 0 200 400 600 800 1000 1200 1400 1 1 140 Effective Resolution F 120 100 Temperature C 80 60 80 60 40 20 400 0 400 800 1200 1600 2000 2400 Temperature F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F Module Data Status and Channel Configuration 4 27 Figure 4 14 Effective Resolution Versus Input Filter Selection for Type R Thermocouples Using 10 50 and 60 Hz Filters 1 6 14 12 1 0 0 8 0 6 04 0 2 200 400 600 800 1000 1200 1400 1600 1800 Temperature 3 0 25 2 0 500 1000 1500 2000 2500 3000 Temperature F Publication 1769 UM004A EN P 4 28 Module Data Status and Channel Configuration 120 100 80 60 40 Effective Resolution 20 200 180 160 140 120 100 80 60 40 20 Effective Resolution F Publication 1769 UM004A EN P Figure 4 15 Effective Resolution Versus Input Filter Selection for Type R Thermocouples Using 250 500 and 1k Hz Filters 200 400 600 800 1000 1200 1400 1600 1800 Temperature C 500 1000 1500 2000 2500 3000 Temperature F Effective Resolution Effective Resolution F 1 6 14 1 2 1 0 0 8 0 6 0 4 0 2 3 0 2 5 2 0 1 5 1 0 0 5 200 Module Data Status and Channel Configuration 4 29 Figure 4 16 Effective Resolution Versus Input Filter Selection for Type S Thermocouple
58. 6 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time C C Offset Time 53 ms 53 ms 53 ms 53 ms 71 ms 283 ms After the above cycles are complete the module returns to scans without autocalibration for approximately 5 minutes At that time the autocalibration cycle repeats Publication 1769 UM004A EN P Module Data Status and Channel Configuration 4 37 Impact of Autocalibration on Module Startup During Mode Change Regardless of the selection of the Enable Disable Cyclic Calibration function an autocalibration cycle occurs automatically on a mode change from Program to Run and on subsequent module startups initialization for all configured channels During module startup input data is not updated by the module and the General Status bits SO to 5 are set to 1 indicating a Data Not Valid condition The amount of time it takes the module to startup is dependent on channel filter frequency selections as indicated in Table 4 7 Channel Update Time on page 4 34 The following is an example calculation of module startup time EXAMPLE 1 Two Channels Enabled for Different Inputs Channel 0 Input Type T Thermocouple with 60 Hz filter Channel 1 Input Type J Thermocouple with 60 Hz filter Module Startup Time Ch 0 Gain Time Ch 0 Offset Time Ch 1 Gain Time Ch 1 Offset Time CJC Gain Time CJC Offset Time CJC 0 Data Acquisition CJC 1 Data Acquisition Ch 0 Data Acquisition
59. 79 49 Wang T P Starr C D Oxidation resistance and stability of nicrosil nisil in air and in reducing atmospheres Temperature Its Measurement and Control in Science and Industry Vol 5 Schooley J F ed New York American Institute of Physics 1982 1147 1157 50 Hess T G Nicrosil nisil high performance thermocouple alloys ISA Transactions 16 3 81 84 1977 51 Anderson R L Lyons J D Kollie T G Christie W H Eby R Decalibration of sheathed thermocouples Temperature Its Measurement and Control in Science and Industry Vol 5 Schooley J F ed New York American Institute of Physics 1982 977 1007 52 Bentley R E Morgan T L Ni based thermocouples in the mineral insulated metal sheathed format thermoelectric instabilities to 1100 C J Phys E Sci Instrum 19 262 268 1986 53 Wang T P Bediones D 10 000 hr stability test of types K N and a Ni Mo Ni Co thermocouple in air and short term tests in reducing atmospheres Temperature Its Measurement and Control in Science and Industry Vol 6 Schooley J F ed New York American Institute of Physics 1992 595 600 54 Burley N A N CLAD N A novel advanced type N integrally sheathed thermocouple of ultra high thermoelectric stability High Temperatures High Pressures 8 609 616 1986 55 Burley N A novel advanced type N integrally sheathed thermocouple of ultra high thermoelectric stability Tbermal and
60. ChannelO Enabled Channel 1 Enabled Channel 2 Enabled Channel 3 Channel 4 Disabled Channel 5 Disabled No Thermocouple Calibration Not Active Sample Sample Sample Perform Enabled Channel4 Enabled Channel 5 TC Enabled CJC Calibration Calibration Active Publication 1769 UM004A EN P 4 34 Module Data Status and Channel Configuration Publication 1769 UM004A EN P Channel update time is dependent upon the input filter selection The following table shows the channel update times Table 4 7 Channel Update Time Filter Frequency Channel Update Time 10 Hz 303 ms 50 Hz 63 ms 60 Hz 53 ms 250 Hz 15ms 500 Hz 9 ms 1 kHz 7 ms The CJC input is only sampled if one or more channels are enabled for any thermocouple type The CJC update time is equal to the largest channel update time of any of the enabled thermocouple inputs types In that case a single CJC update is done per scan See the scan diagram on the previous page The cyclic calibration time only applies when cyclic calibration is enabled and active If enabled the cyclic calibration is staggered over several scan cycles once every five minutes to limit the overall impact to module update time Effects of Autocalibration on Module Update Time The module s autocalibration feature allows it to correct for accuracy errors caused by temperature drift over the module operating temperature range to 60 Autocalibration occurs auto
61. D Hide All Cards Module Configuration Using MicroLogix 1500 and RSLogix500 5 The 1769 IT6 module is installed in slot 1 To configure the module double click on the module slot The general configuration screen appears Module 1 1769 IT6 6 Channel Thermocouple Module Configuration options for channels 0 to 2 are located on a separate tab from channels 3 to 5 as shown below To enable a channel click its Enable box so that a check mark appears in it For optimum module performance disable any channel that is not hardwired to a real input Then choose your Data Format Input Type Filter Frequency Open Circuit response and Units for each channel Module 1 1769 IT6 6 Channel Thermocouple Module Module 1 1769 IT6 6 Channel Thermocouple Module NOTE For a complete description of each of these parameters and the choices available for each of them see Configuration Data File on page 4 5 Publication 1769 UM004A EN P E 6 Module Configuration Using MicroLogix 1500 and RSLogix 500 Configuring Cyclic Calibration The Cal tab contains a check box for disabling cyclic calibration See Selecting Enable Disable Cyclic Calibration Word 6 Bit 0 on page 4 14 for more information Module 1 1769 IT6 6 Channel Thermocouple Module Generic Extra Data Configuration Module 1 1769 IT6 6 Channel Thermocouple Module This tab redisplays the configuration information entered on
62. Input 12 x Module Slot Position 1 1 0 Data Size Input Size 8 words o Ce Set for 1 0 onk Output Size o words Stow ___ Data Description Keying Revision ai fi Electronic Keying Exact Match Configuration Disable Cyclic Calibration Channel Enable Data Format Input Type Temp Units Open Circ Raw Proportional wjDegress F upscale Vv RawiProportional x Dearess F Upscale RawProportional iu m pearess F upscale Raw Proportional x Degress F Upscale Raw Proportional iu xl Degress F Upscale Raw Proportional i Dearess F Upscale ees E Click OK and your configuration for the 1769 IT6 Thermocouple Input module is complete Refer to your Compact I O 1769 ADN DeviceNet Adapter user s manual publication number 1769 UM001A US P for information concerning DeviceNet network configuration and operation Publication 1769 UM004A EN P Glossary The following terms and abbreviations are used throughout this manual For definitions of terms not listed here refer to Allen Bradley s Industrial Automation Glossary Publication AG 7 1 A D Converter Refers to the analog to digital converter inherent to the module The converter produces a digital value whose magnitude is proportional to the magnitude of an analog input signal attenuation The reduction in the magnitude of a signal as it passes through a syst
63. J thermocouple the range 210 C to 1200 is represented as 096 to 10096 See Determining Effective Resolution and Range on page 4 14 Selecting Input Type Bits 11 through 8 Bits 11 through 8 in the channel configuration word indicate the type of thermocouple or millivolt input device Each channel can be individually configured for any type of input Publication 1769 UM004A EN P 4 10 Module Data Status and Channel Configuration Publication 1769 UM004A EN P Selecting Temperature Units Bit 7 The module supports two different linearized scaled ranges for thermocouples degrees Celsius and degrees Fahrenheit F Bit 7 is ignored for millivolt input types or when raw proportional scaled for PID or percent data formats are used If you are using engineering units x 1 data format and IMPORTANT degrees Fahrenheit temperature units thermocouple types B and C cannot achieve full scale temperature with 16 bit signed numerical representation An over range error will occur for the configured channel if it tries to represent the full scale value The maximum representable temperature is 3276 7 F Determining Open Circuit Response Bits 6 and 5 An open circuit condition occurs when an input device or its extension wire is physically separated or open This can happen if the wire is cut or disconnected from the terminal block NOTE If either CJC sensor is removed from the module terminal block its open cir
64. Status T Function Files Au IO Configuration pe Channel Configuration Program Files H 0 Data Files 5C Force Files J Custom Data Monitors EZ Database FES LAD 2 C d For Help press F1 XREF 2 0000 APP READ 7 While offline double click on the IO Configuration icon under the controller folder and the following IO Configuration screen appears 11 0 Configuration BBE Current Cards Available Filter Al 10 7 Read IO Config 17694 8 amp Input Isolated 120 VAC 17694416 16 Input 79 132 VAC 1 769 IF 4 Analog 4 Channel Input Module 17694M12 12 Input 159 265 VAC 17694016 16 Input 10 30 YDC NF69 IQEXOW4 6 Input 24 VDC 4 Output RLY Micrologix 1500 LSP Series B 6 Channel RTD Module Any 1769 UnPowered Cable 6 Channel Thermocouple Module 6 Channel Thermocouple Module 8 Dutput 120 240 VAC Power Supply l 16 Dutput 24 VDC Source 16 Output 24 VDC Source w Protection Analog 2 Channel Output Module 16 Output 24 VDC Sink 8 Output Relay 8 Output Isolated Relay Power Supply Power Supply Any 1769 PowerSupply Any 1769 UnPowered Cable Other Requires 1 0 Card Type ID Hide All Cards This screen allows you to manually enter expansion modules into expansion slots or to automatically read the configuration of the controller To read the existing controller configuration click on the Read IO Config button Publication 1769 UM004A EN P
65. The effect is most serious at temperatures between 800 C and 1050 C The negative thermoelement a copper nickel alloy is subject to composition changes under thermal neutron irradiation since the copper is converted to nickel and zinc Neither thermoelement of type E thermocouples is very sensitive to minor changes in composition or impurity level because both are already heavily alloyed Similarly they are also not extremely sensitive to minor differences in heat treatment provided that the treatment does not violate any of the restrictions mentioned above For most general applications they may be used with the heat treatment given by the wire manufacturers However when the highest accuracy is sought additional preparatory heat treatments may be desirable in order to enhance their performance Details on this and other phases of the use and behavior of type KP thermoelements EP is the same as KP are given in publications by Pots and McElroy 14 by Burley and Ackland 15 by Burley 16 by Wang and Starr 17 18 by Bentley 19 and by Kollie et al 20 ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type E commercial thermocouples be 1 7 or 0 5 percent whichever is greater between 0 C and 900 C and 1 7 C or 1 percent whichever is greater between 200 C and 0 C Type E thermocouples can also be supplied to meet special tolerances which ar
66. Using 250 500 and 1 kHz Filter 60 50 40 30 Accuracy C 20 0 200 400 600 800 1000 1200 1400 1600 1800 Thermocouple Temperature C 120 100 80 60 Accuracy F 40 20 500 1000 1500 2000 2500 3000 Thermocouple Temperature F Publication 1769 UM004A EN P Accuracy C Accuracy F Specifications A 19 Figure A 15 Module Accuracy at 25 C 77 F Ambient for Type S Thermocouple Using 10 50 and 60 Hz Filter 1 8 1 6 1 4 1 2 1 0 0 8 0 6 0 4 0 2 0 200 400 600 800 1000 1200 1400 1600 1800 Thermocouple Temperature C 3 0 2 5 2 0 0 5 500 1000 1500 2000 2500 3000 Thermocouple Temperature F Publication 1769 UMO004A EN P A 20 Specifications Publication 1769 UM004A EN P Accuracy C Accuracy F 50 40 30 20 Figure A 16 Module Accuracy at 25 C 77 F Ambient forType S Thermocouple Using 250 500 and 1 kHz Filter 60 200 400 600 800 1000 1200 1400 1600 1800 Thermocouple Temperature 120 100 500 1000 1500 2000 2500 3000 Thermocouple Temperature F Accuracy C Accuracy F Specifications 21 Figure A 17 Module Accuracy at 25 C 77 F Ambient for Type T Thermocouple Using 10 50 and 60 Hz Filter 0 300 200 100 0 100 200 300 400 Thermocouple Temperature C N wo FP oa N CO co c 0 500 400 300 200 100 0 100 200 300 400 500 600 700 800 The
67. Values Two s Complement Binary Numbers The processor memory stores 16 bit binary numbers Two s complement binary is used when performing mathematical calculations internal to the processor Analog input values from the analog modules are returned to the processor in 16 bit two s complement binary format For positive numbers the binary notation and two s complement binary notation are identical As indicated in the figure on the next page each position in the number has a decimal value beginning at the right with 2 and ending at the left with 215 Each position can be 0 or 1 in the processor memory 0 indicates a value of 0 a 1 indicates the decimal value of the position The equivalent decimal value of the binary number is the sum of the position values The far left position is always 0 for positive values As indicated in the figure below this limits the maximum positive decimal value to 32767 all positions are 1 except the far left position For example 0000 1001 0000 1110 211 28 23 22 2 2048125648442 2318 0010 0011 0010 1000 213 23 28 25 23 819245124256 3248 9000 1x 21 16384 16384 1x2 28192 8192 1x21 4096 4096 1x21 2048 2048 1x21 1024 1024 1x29 512 512 1x28 256 256 1x2 128 128 1x26 64 64 1x25 32 32 1x24 16 16 1x23 8 8 1x22 4 4 1x2 2 2 1x2 1 1 Q 1 4 1 4 4 d 4 1 4 34 4 32767
68. When attaching I O modules it is very important that the bus connectors are securely locked together to ensure proper electrical connection Attach an end cap terminator 5 to the last module in the system by using the tongue and groove slots as before Lock the end cap bus terminator 6 T TTTAETTI A 1769 ECR or 1769 ECL right or left end cap respectively must be used to terminate the end of the 1769 communication bus Publication 1769 UM004A EN P 2 4 Quick Start for Experienced Users Step 3 Wire the module Reference Chapter 3 Installation and Wiring Follow the guidelines below when wiring the module General Publication 1769 UM004A EN P e Power and input wiring must be in accordance with Class 1 Division 2 wiring methods Article 501 40 of the National Electric Code NFPA 70 and in accordance with the authority having jurisdiction e Channels are isolated from one another by 10V dc maximum Route field wiring away from any other wiring and keep it as far as possible from sources of electrical noise such as motors transformers contactors and ac devices As a general rule allow at least 15 2 cm 6 in of separation for every 120V of power Routing field wiring in a grounded conduit can reduce electrical noise e If field wiring must cross ac or power cables ensure that they cross at right angles e If multiple power supplies are used with analog millivolt inputs the p
69. a grounded junction thermocouple are connected together and then connected to chassis ground Use of this thermocouple with an electrically conductive sheath removes the thermocouple signal to chassis ground isolation of the module In addition if multiple grounded junction thermocouples are used the module channel to channel isolation is removed since there is no isolation between signal and sheath sheaths are tied together It should be noted that the isolation is removed even if the sheaths are connected to chassis ground at a location other than the module since the module is connected to chassis ground 1769 IT6 Multiplexer Metal sheath with Electrical Continuity to Thermocouple Signal Wires Rockwell Automation recommends that a grounded junction thermocouple have a protective sheath made of electrically insulated material for example ceramic An alternative is to float the metal sheath with respect to any path to chassis ground or to another thermocouple metal sheath Thus the metal sheath must be insulated from electrically conductive process material and have all connections to chassis ground broken Note that a floated sheath can result in a less noise immune thermocouple signal An ungrounded isolated junction thermocouple uses a measuring junction that is electrically isolated from the protective metal sheath This junction type is often used in situations when noise will affect readings as well as situations
70. able for accurate thermometry because there are significant nonlinear deviations in the thermoelectric output of thermocouples obtained from different manufacturers These irregular deviations lead to difficulties in obtaining accurate calibrations based on a limited number of calibration points The positive thermoelement is commercially pure 99 5 percent Fe iron usually containing significant impurity levels of carbon chromium copper manganese nickel phosphorus silicon and sulfur Thermocouple wire represents such a small fraction of the total production of commercial iron wire that the producers do not control the chemical composition to maintain constant thermoelectric properties Instead instrument companies and thermocouple fabricators select material most suitable for the thermocouple usage The total and specific types of impurities that occur in commercial iron change with time location of primary ores and methods of smelting Many unusual lots have been selected in the past for example spools of industrial iron wire and even scrapped rails from an elevated train line At present iron wire that most closely fits these tables has about 0 25 percent manganese and 0 12 percent copper plus other minor impurities The negative thermoelement for type J thermocouples is a copper nickel alloy known ambiguously as constantan The word constantan has commonly referred to copper nickel alloys containing anywhere from 45 to 60 percent copp
71. age developed by the thermocouple with the reference junction at 0 C undergoes a reversal in sign at about 42 C and between 0 C and 50 C varies from a minimum of 2 6uV near 21 C to a maximum of 2 3uV at 50 C Therefore in use if the reference junction of the thermocouple is within the range 0 C to 50 C then a 0 C reference junction temperature can be assumed and the error introduced will not exceed 3uV At temperatures above 1100 C an additional measurement error of about 0 3 C would be insignificant in most instances ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type B commercial thermocouples be 0 5 percent between 870 C and 1700 C Type B thermocouples can also be supplied to meet special tolerances of 0 25 percent Tolerances are not specified for type B thermocouples below 870 C Type E Thermocouples Thermocouple Descriptions C 3 The suggested upper temperature limit of 1700 C given in the ASTM standard 7 for protected type B thermocouples applies to AWG 24 0 51 mm wire This temperature limit applies to thermocouples used in conventional closed end protecting tubes and it is intended only as a rough guide to the user It does not apply to thermocouples having compacted mineral oxide insulation This section describes Nickel Chromium Alloy Versus Copper Nickel Alloy thermocouples known as type E thermocouples This type and
72. al compositions due to transmutation are small The KN thermoelements are somewhat less stable than the KP thermoelements in that they experience a small increase in the iron content accompanied by a slight decrease in the manganese and cobalt contents Publication 1769 UM004A EN P C 8 Thermocouple Descriptions Type N Thermocouples Publication 1769 UM004A EN P ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type K commercial thermocouples be 2 2 C or 0 75 percent whichever is greater between 0 and 1250 C and 2 2 C or 2 percent whichever is greater between 200 C and 0 In the 0 C to 1250 C range type K thermocouples can be supplied to meet special tolerances that are equal to approximately one half the standard tolerances given above Type K thermocouple materials are normally supplied to meet the tolerances specified for temperatures above 0 C However the same materials may not satisfy the tolerances specified for the 200 C to 0 C range If materials are required to meet the tolerances below 0 C this should be specified when they are purchased The suggested upper temperature limit of 1260 C given in the ASTM standard 7 for protected type K thermocouples applies to AWG 8 3 25 mm wire It decreases to 1090 C for AWG 14 1 63 mm 980 C for AWG 20 0 81 mm 870 for AWG 24 or 28 0 51 mm or 0 33 mm and 760 C for AWG 30 0 25 mm
73. ature range 7 7 type description C 13 temperature range 1 7 Publication 1769 UM004A EN P 4 Index U under range flag bits 4 4 update time 4 33 update time See channel update time update time See module update time Publication 1769 UM004A EN P W wire size 3 11 wiring 3 7 module 3 17 modules 3 12 routing considerations 3 4 terminal block 3 11 www rockwellautomation com Power Control and Information Solutions Headquarters Americas Rockwell Automation 1201 South Second Street Milwaukee WI 53204 2496 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Europe Middle East Africa Rockwell Automation Vorstlaan Boulevard du Souverain 36 1170 Brussels Belgium Tel 32 2 663 0600 Fax 32 2 663 0640 Asia Pacific Rockwell Automation Level 14 Core F Cyberport 3 100 Cyberport Road Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Publication 1769 UMO004A EN P February 2001 2001 Rockwell International Corporation Printed in the U S A
74. be compensated for Two cold junction compensating thermistors have been integrated in the removable terminal block These thermistors must remain installed to retain accuracy Do not remove or loosen the cold junction compensating ATTENTION thermistor assemblies located on between the two upper and lower CJC terminals Both thermistor assemblies are critical to ensure accurate thermocouple input readings at each channel The module will operate in the thermocouple mode but at reduced accuracy if either CJC sensor is removed See Determining Open Circuit Response Bits 6 and 5 on page 4 10 If either of the thermistor assemblies are accidentally removed re install them by connecting each one across each pair of CJC terminals Publication 1769 UM004A EN P 3 14 Installation and Wiring Calibration Publication 1769 UM004A EN P The thermocouple module is initially calibrated at the factory The module also has an autocalibration function When an autocalibration cycle takes place the module s multiplexer is set to system ground potential and an A D reading is taken The A D converter then sets its internal input to the module s precision voltage source and another reading is taken The A D converter uses these numbers to compensate for system offset zero and gain span errors Autocalibration of a channel occurs whenever a channel is enabled You can also program your module to perform cyclic calibration cycles every five
75. ble Cyclic Calibration Word 6 Bit 0 2 Determining Effective Resolution and Range Determining Module Update Time Effects of Autocalibration on Module Update Time Calculating Module Update Impact of Autocalibration on Module Startup During Mode Chapter 5 Safety Indicator LIS ud ed eere EEEN Stand Clear of Equipment aoaaa aaaea Program Alteration Safety Circuits a a a re ee Module Operation vs Channel Operation Power up Diagnostics Table of Contents iii Channel 5 5 3 Invalid Channel Configuration Detection 5 3 Over or Under Range Detection ojos fy ahd Bek MS 5 3 Open Circuit 5 3 Non critical vs Critical Module Errors 5 4 Module Error Definition Table 5 4 Module Error 5 4 Extended Error Information Field 5 5 EPROP C OES A a 5 6 Module Inhibit 5 8 Contacting Rockwell Automation 5 8 Appendix Specifications General Specifications
76. cent shall be alloyed with platinum of 99 99 percent purity to produce the positive thermoelement which typically contains 13 00 0 05 percent rhodium by weight This consensus standard 21 describes the purity of commercial type R materials that are used in many industrial thermometry applications and that meet the calibration tolerances described later in this section It does not cover however the higher purity reference grade materials that traditionally were used to construct thermocouples used as transfer standards and reference thermometers in various laboratory applications and to develop reference functions and tables 22 23 The higher purity alloy material typically contains less than 500 atomic ppm of impurities and the platinum less than 100 atomic ppm of impurities 22 Type S Thermocouples Thermocouple Descriptions C 11 Differences between such high purity commercial material and the platinum thermoelectric reference standard Pt 67 are described in 22 and 23 A reference function for the type R thermocouple based on the ITS 90 and the SI volt was determined recently from new data obtained in a collaborative effort by NIST and NPL The results of this international collaboration were reported by Burns et al 23 The function was used to compute the reference table given in this monograph Type R thermocouples have about a 12 percent larger Seebeck coefficient than do Type S thermocouples over much of the range T
77. ctLogix controller Channel level operations describe channel related functions such as data conversion and over or under range detection Internal diagnostics are performed at both levels of operation When detected module error conditions are immediately indicated by the module status LED Both module hardware and channel configuration error conditions are reported to the controller Channel over range or under range and open circuit conditions are reported in the module s input data table Module hardware errors are typically reported in the controller s I O status file Refer to your controller manual for details At module power up a series of internal diagnostic tests are performed If these diagnostic tests are not successfully completed the module status LED remains off and a module error is reported to the controller If module status Indicated Corrective action LED is condition Proper Operation No action required Off Module Fault Cycle power If condition persists replace the module Call your local distributor or Rockwell Automation for assistance Channel Diagnostics Diagnostics and Troubleshooting 5 3 When an input channel is enabled the module performs a diagnostic check to see that the channel has been properly configured In addition the channel is tested on every scan for configuration errors over range and under range and open circuit conditions Invalid Channel Configuration De
78. cuit bit is set 1 and the module continues to calculate thermocouple readings at reduced accuracy If an open CJC circuit is detected at power up the module uses 25 C as the sensed temperature at that location If an open CJC circuit is detected during normal operation the last valid CJC reading is used An input channel configured for millivolt input is not affected by CJC open circuit conditions See Open Circuit Detection on page 5 3 for additional details Bits 6 and 5 define the state of the channel data word when an open circuit condition is detected for the corresponding channel The module overrides the actual input data depending on the option that you specify when it detects an open circuit The open circuit options are explained in the table below Table 4 3 Open Circuit Response Definitions Response Definition Option Upscale Sets the input data value to full upper scale value of channel data word The full scale value is determined by the selected input type and data format Downscale Sets the input data value to full lower scale value of channel data word The low scale value is determined by the selected input type and data format Last State Sets the input data value to the last input value prior to the detection of the open circuit Zero Sets the input data value to 0 to force the channel data word to 0 Module Data Status and Channel Configuration 4 11 Selecting Input Filter Frequency Bits 2
79. d Troubleshooting Publication 1769 UM004A EN P Field Wiring System Wiring Terminal Door 1 Removing and Replacing the Terminal Block Wiring the Finger Safe Terminal Block Wiring rhe Nie s x mie ee Cold Junction Compensation Calibration qi dps erid aaa 4b deed ed ERE sid Chapter 4 Module Memory Accessing Input Image File Input Data Files aces ee doe I SC d Ree te ede Input Data General Status Bits 90 to S7 Open Circuit Flag Bits to 7 Over Range Flag Bits O0 to 7 Under Range Flag Bits 07 Configuring Configuration Data Channel Configuration Enabling or Disabling a Channel Bit 15 Selecting Data Formats Bits 14 through 12 Selecting Input Type Bits 11 through 8 Selecting Temperature Units Bit 7 Determining Open Circuit Response Bits 6 and 5 Selecting Input Filter Frequency Bits 2 through 0 Selecting Enable Disa
80. d analog common during normal differential operation configuration word Word containing the channel configuration information needed by the module to configure and operate each channel Publication 1769 UM004A EN P Glossary 2 Publication 1769 UM004A EN P cut off frequency The frequency at which the input signal is attenuated 3 dB by a digital filter Frequency components of the input signal that are below the cut off frequency are passed with under 3 dB of attenuation for low pass filters data word A 16 bit integer that represents the value of the input channel The channel data word is valid only when the channel is enabled and there are no channel errors When the channel is disabled the channel data word is cleared 0 dB decibeD A logarithmic measure of the ratio of two signal levels digital filter A low pass filter incorporated into the A D converter The digital filter provides very steep roll off above it s cut off frequency which provides high frequency noise rejection effective resolution The number of bits in a channel configuration word that do not vary due to noise filter A device that passes a signal or range of signals and eliminates all others filter frequency The user selectable frequency for a digital filter full scale The magnitude of input over which normal operation is permitted full scale range The difference between the maximum and minimum specified
81. d conduit can reduce electrical noise e If field wiring must cross ac or power cables ensure that they cross at right angles e If multiple power supplies are used with analog millivolt inputs the power supply commons must be connected Installation and Wiring 3 9 Terminal Block Do not use the module s NC terminals as connection points e Do not tamper with or remove the CJC sensors on the terminal block Removal of one or both sensors will reduce accuracy For millivolt sensors use Belden 8761 shielded twisted pair wire or equivalent to ensure proper operation and high immunity to electrical noise e For a thermocouple use the shielded twisted pair thermocouple extension lead wires specified by the thermocouple manufacturer Using the incorrect type of thermocouple extension wire or not following the correct polarity will cause invalid readings e To ensures optimum accuracy limit overall cable impedance by keeping a cable as short as possible Locate the module as close to input devices as the application permits Grounding ATTENTION The possibility exists that a grounded or exposed thermocouple can become shorted to a potential greater than that of the thermocouple itself Due to possible shock hazard take care when wiring grounded or exposed thermocouples See Appendix D Using Thermocouple Junctions e This product is intended to be mounted to a well grounded mounting surface such as a me
82. ddresses have the following format e Input Data Local s I e Configuration Data Local s C Where s is the slot number assigned the I O modules in the Generic Profiles In order to configure an I O module you must open up the configuration tag for that module by clicking on the plus sign to the left of its configuration tag in the Controller Tag data base Publication 1769 UM004A EN P F 6 X Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers RSLogix 5000 Configuring a 1769 IT6 Thermocouple Module Publication 1769 UM004A EN P To configure the 1769 IT6 module in slot 1 click on the plus sign left of Local 1 C Configuration data is entered under the Local 1 C Data tag Click the plus sign to the left of Local 1 C Data to reveal the 8 integer data words where configuration data may be entered for the 1769 IT6 module The tag addresses for these 8 words are Local 1 C Data 0 through Local 1 C Data 7 Only the first 7 words of the configuration file apply The last word must exist but should contain a value of 0 decimal The first 6 configuration words 0 through 5 apply to 1769 IT6 channels 0 through 5 respectively All 6 words configure the same parameters for the 6 different channels The seventh configuration word is used for enabling or disabling cyclic calibration The following table shows the various parameters to configure in each channel configuration word For a complete descriptio
83. delines and details ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type N commercial thermocouples be 2 2 C or 0 75 percent whichever is greater between 0 C and 1250 C Type N thermocouples can also be supplied to meet special tolerances that are equal to approximately one half the standard tolerances given above Tolerances are not specified for type N thermocouples below 0 C The suggested upper temperature limit of 1260 C given in the ASTM standard 7 for protected type N thermocouples applies to AWG 8 3 25 mm wire It decreases to 1090 C for AWG 14 1 63 mm 980 C for AWG 20 0 81 mm 870 C for AWG 24 or 28 0 51 mm or 0 33 mm and 760 C for AWG 30 0 25 mm These temperature limits apply to thermocouples used in conventional closed end protecting tubes and they are intended only as a rough guide to the user They do not apply to thermocouples having compacted mineral oxide insulation This section describes Platinum 13 percent Rhodium Alloy Versus Platinum thermocouples called type R thermocouples This type is often referred to by the nominal chemical composition of its positive RP thermoelement platinum 13 percent rhodium The negative RN thermoelement is commercially available platinum that has a nominal purity of 99 99 percent 21 An industrial consensus standard ASTM E1159 87 specifies that rhodium having a nominal purity of 99 98 per
84. dicated in the module input data table Critical module errors are conditions that may prevent normal or recoverable operation of the system When these types of errors occur the system typically leaves the run or program mode of operation until the error can be dealt with Critical module errors are indicated in Table 5 3 Extended Error Codes on page 5 6 Analog module errors are expressed in two fields as four digit Hex format with the most significant digit as don t care and irrelevant The two fields are Module Error and Extended Error Information The structure of the module error data is shown below Don t Care Bits Module Error Extended Error Information 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1 Module Error Field Publication 1769 UM004A EN P The purpose of the module error field is to classify module errors into three distinct groups as described in the table below The type of error determines what kind of information exists in the extended error information field These types of module errors are typically reported in the controller s I O status file Refer to your controller manual for details Table 5 2 Module Error Types Error Type Module Error Description Field Value Bits 11 through 9 binary No Errors 000 No error is present The extended error field holds no additional info
85. dule to sample and convert the input signals of all enabled input channels and make the resulting data values available to the processor multiplexer An switching system that allows several signals to share a common A D converter normal mode rejection differential mode rejection A logarithmic measure in dB of a device s ability to reject noise signals between or among circuit signal conductors The measurement does not apply to noise signals between the equipment grounding conductor or signal reference structure and the signal conductors number of significant bits The power of two that represents the total number of completely different digital codes to which an analog signal can be converted or from which it can be generated overall accuracy The worst case deviation of the digital representation of the input signal from the ideal over the full input range is the overall accuracy Overall accuracy is expressed in percent of full scale repeatability The closeness of agreement among repeated measurements of the same variable under the same conditions resolution The increment of change represented by one unit For example the resolution of engineering units x1 is 0 1 and the resolution of raw proportional data is equal to maximum value minimum value 655234 sampling time The time required by the A D converter to sample an input channel Publication 1769 UM004A EN P Glossary 4 Publicati
86. e bed CEDE Yeituna Aros A 71 380 Ue Ron AIT J Corivoles Fuit Hardie C3 PowerUp Horta es Tass 8 Mantak 48 MarProgoe Progam Tage 1 Manficuline 73 Uracheduled Piogians 3 Trende Data Types Module Delined 83 UO Corfiga dice 0 ConwosctB us Local In the Controller Organizer on the left of the screen right click on 0 CompactBus Local select New Module and the following screen appears Select Module Ed Type Major Revision 1769 MODULE fi Type Description 1769 MODULE Generic 1769 Module Show Vendor All 7 M Other Specialty 1 0 Select All Analog I Digital Communication v Motion Processor Clear All This screen is used to narrow your search for I O modules to configure into your system With the initial release of the CompactLogix5320 controller this screen only includes the Generic 1769 Module Click the OK button and the following default Generic Profile screen appears Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 F 3 Module Properties Local 1769 MODULE 1 1 x Type 1769 MODULE Generic 1769 Module NE VA Connection Parameters Assembly Instance Size Name Input fi 01 2 zi 16 bit Description aj Output 104 Configuration fi 02 o E 16 bit Comm Format Input Data INT Slot 1 m
87. e wiring holes and gently pry the cover off If you wire the terminal block with the finger safe cover removed you may not be able to put it back on the terminal block because the wires will be in the way Wire Size and Terminal Screw Torque Each terminal accepts up to two wires with the following restrictions Wire Type Terminal Screw Retaining Screw Torque Torque Solid Cu 90 C 194 F 14 to 22 AWG 0 68 Nm 6 in lbs 0 46 Nm 4 1 in Ibs Stranded Cu 90 C 194 F 16 to 22 AWG 0 68 Nm 6 in lbs 0 46 Nm 4 1 in Ibs Publication 1769 UM004A EN P 3 12 Installation and Wiring Publication 1769 UM004A EN P Wiring the Module ATTENTION prevent shock hazard care should be taken when wiring the module to analog signal sources Before wiring any module disconnect power from the system power supply and from any other source to the module After the module is properly installed follow the wiring procedure below using the proper thermocouple extension cable or Belden 8761 for non thermocouple applications yf Cut foil shield and drain wire signal wire signal wire drain wire foil shield signal wire signal wire To wire your module follow these steps 1 At each end of the cable strip some casing to expose the individual Wires Trim the signal wires to 2 inch 5 cm lengths Strip about 3 16 inch 5 mm of insulation away to expose the end of the wire ATTENTION Be carefu
88. e Appendix E for RSLogix 5000 CompactLogix controller see Appendix for RSNetworx 1769 ADN see Appendix G The structure and bit settings are shown in Channel Configuration on page 4 6 Publication 1769 UM004A EN P 4 6 Module Data Status and Channel Configuration Channel Configuration Each channel configuration word consists of bit fields the settings of which determine how the channel operates See the table below and the descriptions that follow for valid configuration settings and their meanings To Select Make these bit settings 1 14 133 12 11 10 9 8 7 6543 N Filter 10 Hz Frequency 60 Hz 50 Hz 250Hz 500 Hz oj oO gt o oj gt gt O O O 1 kHz Open Circuit Upscale Downscale Hold Last State Zero Temperature Degrees 0 oO o i c Units Degrees F 1 Input Type Thermocouple J Thermocouple K Thermocouple T Thermocouple E 1 1 Not Used Thermocouple R Thermocouple S Thermocouple B Thermocouple N Thermocouple C 50 to 50 mV gt O O S O O O ojl o oj O o 100 to 100 mV Data Format Raw Proportional Engineering Units Engineering Units X 10 Scaled for PID Percent Range Enable Disable 0 oj O O O O gt O oj Cha
89. e S thermocouples at high temperatures gt 1200 C depends primarily upon the quality of the materials used for protection and insulation and has been studied by Walker et al 25 26 and by Bentley 29 High purity alumina with low iron content appears to be the most suitable material for insulating protecting and mechanically supporting the thermocouple wires Both thermoelements of type 5 thermocouples are sensitive to impurity contamination In fact type R thermocouples were developed essentially because of iron contamination effects in some British platinum 10 percent rhodium wires The effects of various impurities on the thermoelectric voltages of platinum based thermocouple materials have been described by Rhys and Taimsalu 35 by Cochrane 36 and by Aliotta 37 Impurity contamination usually causes negative changes 25 26 29 in the thermoelectric voltage of the thermocouple with time the extent of which will depend upon the type and amount of chemical contaminant Such changes were shown to be due mainly to the platinum thermoelement 25 26 29 Volatilization of the rhodium from the positive thermoelement Type T Thermocouples Thermocouple Descriptions C 13 for the vapor transport of rhodium from the positive thermoelement to the pure platinum negative thermoelement also will cause negative drifts in the thermoelectric voltage Bentley 29 demonstrated that the vapor transport of rhodium can be virtually eliminated at 17
90. e equal to 1 C or 0 4 percent whichever is greater between 0 C and 900 C and 1 or 0 5 percent whichever is greater between 200 C and 0 C Type E thermocouple materials are normally supplied to meet the tolerances specified for temperatures above 0 C The same materials however may not satisfy the tolerances specified for the 200 C to 0 C range If materials are required to meet the tolerances below 0 C this should be specified when they are purchased The suggested upper temperature limit 870 C given in the ASTM standard 7 for protected type E thermocouples applies to AWG 8 3 25 mm wire It decreases to 650 C for AWG 14 1 63 mm 540 C for AWG 20 0 81 mm 430 C for AWG 24 or 28 0 51 mm or 0 33 mm and 370 C for AWG 30 0 25 mm These temperature limits apply to thermocouples used in conventional closed end protecting tubes and they are intended only as a rough guide to the user They do not apply to thermocouples having compacted mineral oxide insulation Thermocouple Descriptions C 5 Type J Thermocouples This section discusses Iron Versus Copper Nickel Alloy SAMA thermocouples called type J thermocouples A type J thermocouple is one of the most common types of industrial thermocouples because of its relatively high Seebeck coefficient and low cost It has been reported that more than 200 tons of type J materials are supplied annually to industry in this country However this type is least suit
91. efault value of the configuration data is represented by zeros in the data file The structure of the channel configuration file is shown below Word 15 14 8 7 6 0 Bit Enable Data Format Input Type Temperature Open Circuit Not Not Filter Frequency Channel 0 Channel Units Condition Channel 0 Channel 0 Used Used 0 0 Channel 0 Channel 0 Data Format Input Type Open Circuit Not Not Filter Frequency Channel Channel 1 Channel 1 unis Condition Used Used 1 1 Channel 1 Channel 1 Enable Data Format Input Type Temperature Open Circuit Not Not Filter Frequency Channel 2 Channel Channel 2 Channel 2 Condition Used Used 2 Channel 2 Channel 2 Enable Data Format Input Type Open Circuit Not Not Filter Frequency Channel 3 Channel Units Condition Channel 3 Channel 3 Used Used 3 3 Channel 3 Channel 3 Enable Data Format Input Type Open Circuit Not Not Filter Frequency Channel i Channel Channel 4 Channel 4 is Condition Used Used 4 4 Channel 4 Channel 4 Enable Data Format Input Type Tope atre Open Circuit Not Not Filter Frequency Channel 5 Channel Units Condition Channel 5 Channel 5 Used Used 5 5 Channel 5 Channel 5 Enable 6 Reserved Disable Cyclic Calibration The configuration file can also be modified through the control program if supported by the controller For information on configuring the module using RSLogix 500 with MicroLogix 1500 controller se
92. em bus connector A 16 pin male and female connector that provides electrical interconnection between the modules channel Refers to input interfaces available on the module s terminal block Each channel is configured for connection to a thermocouple or millivolt input device and has its own data and diagnostic status words channel update time The time required for the module to sample and convert the input signals of one enabled input channel and update the channel data word CJC Cold junction compensation CJC is the means by which the module compensates for the offset voltage error introduced by the temperature at the junction between a thermocouple lead wire and the module terminal block the cold junction common mode rejection For analog inputs the maximum level to which a common mode input voltage appears in the numerical value read by the processor expressed in dB common mode rejection ratio CMMR The ratio of a device s differential voltage gain to common mode voltage gain Expressed in dB CMRR is a comparative measure of a device s ability to reject interference caused by a voltage common to its input terminals relative to ground CMRR 20 Logo V1 V2 common mode voltage The voltage difference between the negative terminal and analog common during normal differential operation common mode voltage range The largest voltage difference allowed between either the positive or negative terminal an
93. enabled a calibration cycle occurs every five minutes thereafter The calibration cycle of each enabled channel is staggered over several module scan cycles within the five minute period to limit impact on the system response speed See Effects of Autocalibration on Module Update Time on page 4 34 The effective resolution for an input channel depends upon the filter frequency selected for that channel The following graphs provide the effective resolution for each of the range selections at the six available frequencies These graphs do not include the affects of unfiltered input noise Choose the frequency that most closely matches your requirements Effective Resolution Effective Resolution F 3 0 2 5 2 0 1 5 1 0 0 5 5 0 4 5 4 0 3 5 3 0 2 5 2 0 1 5 1 0 0 5 Module Data Status and Channel Configuration 4 15 Figure 42 Effective Resolution Versus Input Filter Selection for Type B Thermocouples Using 10 50 and 60 Hz Filters 600 800 1000 1200 1400 1600 1800 2000 Temperature 1000 1500 2000 2500 3000 3500 Temperature F Publication 1769 UM004A EN P 4 16 Module Data Status and Channel Configuration Figure 4 3 Effective Resolution Versus Input Filter Selection for Type B Thermocouples Using 250 500 and 1k Hz Filters 180 160 140 120 me 60 40 20 oe 600 800 1000 1200 1400 1600 1800 2000 Effective Resolution C Temperature 350 300 250 200 10
94. er 115 dB minimum at 60 Hz with 10 Hz or 60 Hz filter Normal Mode Rejection Ratio 85 dB minimum at 50 Hz with 10 Hz or 50 Hz filter 85 dB minimum at 60 Hz with 10 Hz or 60 Hz filter Maximum Cable Impedance Input Impedance 25 Q for specified accuracy 10M Q Open circuit Detection Time 7 ms to 2 1 seconds Calibration The module performs autocalibration upon power up and whenever a channel is enabled You can also program the module to calibrate every five minutes Non linearity in percent full scale 0 03 1 Rated working voltage is the maximum continuous voltage that can be applied at the input terminal including the input signal and the value that floats above ground potential for example 30V dc input signal and 20V dc potential above ground 2 For proper operation both the plus and minus input terminals must be within 10V dc of analog common 3 Open circuit detection time is equal to the module scan time which is based on the number of enabled channels and the filter frequency of each channel Repeatability at 25 C 77 F 2 Specification Module Error over Full Temperature Range Specifications A 3 Value See Accuracy on page A 4 0 to 60 C 32 F to 140 F CJC Sensor Accuracy 0 3 C 0 54 F CJC Accuracy 1 0 C 1 8 Maximum Overload at Input Terminals 35V dc continuous Input Group to Bus Isolation
95. er plus minor impurities of carbon cobalt iron and manganese Constantan for type J thermocouples usually contains about 55 percent copper 45 percent nickel and a small but thermoelectrically significant amount of cobalt iron and manganese about 0 1 percent or more It should be emphasized that type JN thermoelements are NOT generally interchangeable with type TN or EN thermoelements although they are all referred to as constantan In order to provide some differentiation in nomenclature type JN is often referred to as SAMA constantan Type J thermocouples are recommended by the ASTM 5 for use in the temperature range from 0 to 760 C in vacuum oxidizing reducing or inert atmospheres If used for extended times in air above 500 C heavy gauge wires are recommended because the oxidation rate is rapid at elevated temperatures Oxidation normally causes a gradual decrease in the thermoelectric voltage of the thermocouple with time Because iron rusts in moist atmospheres and may become brittle type J thermocouples are not recommended for use below 0 C In addition they should not be used unprotected in sulfurous atmospheres above 500 C The positive thermoelement iron is relatively insensitive to composition changes under thermal neutron irradiation but does exhibit a slight Publication 1769 UM004A EN P C 6 Thermocouple Descriptions Type K Thermocouples Publication 1769 UM004A EN P increase in manganese conte
96. et for 1 0 onl Dutput Size o words Setter ony Data Description Keying Revision zl Electronic Keying Exact Match Configuration Disable Cyclic Calibration Channel Enable Data Format Input Type Temp Units Open Circ RawProportional Degress F upscale IRaw Proportional J Degress F upscale Raw iProportional bd G Degress F Upscale RawProportional 0 Degress F upscale RawProportional EZ x Degress F upscale Raw iProportional 0 Degress F upscale See 2 By default the 1769 IT6 module contains eight input words and no output words Click on the Data Description button This shows what the 8 input words represent i e the first six words are the actual thermocouple input data while the following two words contain status open circuit bits and over and under range bits for the six channels Click OK or CANCEL to exit this screen and return to the Configuration screen If your application only requires the 6 data words and not the status information click the Set for I O only button and the Input Size will change to 6 words You may leave the Electronic Keying to Exact Match It is not recommended to Disable Keying but if you are not sure of the exact revision of your module selecting Compatible Module will allow your system to operate and the system will still require a 1769 IT6 in slot 1 Each of the
97. ew ion lower retaining screw CJC sensors Publication 1769 UM004A EN P 1 4 Overview System Overview Publication 1769 UM004A EN P General Diagnostic Features The module contains a diagnostic LED that helps you identify the source of problems that may occur during power up or during normal channel operation The LED indicates both status and power Power up and channel diagnostics are explained Chapter 5 Diagnostics and Troublesbooting The modules communicate to the controller through the bus interface The modules also receive 5 and 24V dc power through the bus interface System Operation At power up the module performs a check of its internal circuits memory and basic functions During this time the module status LED remains off If no faults are found during power up diagnostics the module status LED is turned on After power up checks are complete the module waits for valid channel configuration data If an invalid configuration is detected the module generates a configuration error Once a channel is properly configured and enabled it continuously converts the thermocouple or millivolt input to a value within the range selected for that channel Each time a channel is read by the input module that data value is tested by the module for an over range under range open circuit or input data not valid condition If such a condition is detected a unique bit
98. hen configured for thermocouple input types the module converts the analog input voltages into cold junction compensated and linearized digital temperature readings The module uses the National Institute of Standards and Technology NIST ITS 90 standard for linearization for all thermocouple types J K T E R S B N When configured for millivolt inputs the module converts the analog values directly into digital counts Module Field Calibration The module provides autocalibration which compensates for offset and gain drift of the A D converter caused by a temperature change within the module An internal high precision low drift voltage and system ground reference is used for this purpose The input module performs autocalibration when a channel is initially enabled In addition you can program the module to perform a calibration cycle once every 5 minutes See Selecting Enable Disable Cyclic Calibration Word 6 Bit 0 on page 4 14 for information on configuring the module to perform periodic autocalibration Publication 1769 UM004A EN P 1 6 Overview Publication 1769 UM004A EN P Before You Begin Required Tools and Equipment Chapter 2 Quick Start for Experienced Users This chapter can help you to get started using the 1769 IT6 thermocouple mV input module We base the procedures here on the assumption that you have an understanding of Allen Bradley controllers You should understand electronic process contr
99. hermocouples S and R 0 4 C 0 72 F Thermocouple C 0 7 C 1 26 F Thermocouple B 0 2 C 0 36 F 50 mV 6 uV 100 mV 6 uV 1 Repeatability is the ability of the input module to register the same reading in successive measurements for the same input signal 2 Repeatability at any other temperature in the 0 to 60 C 32 to 140 F range is the same as long as the temperature is stable Publication 1769 UM004A EN P A 4 Specifications Accuracy Input Type Thermocouple J 210 C to 1200 C 346 F to 2192 F With Autocalibration Enabled Accuracy 3 for 10 Hz 50 Hz and 60 Hz Filters max Without Autocalibration Maximum Temperature Drift 4 at 25 C 77 F Ambient 0 6 C 1 1 F at 0 to 60 C 32 to 140 F Ambient 0 9 C 1 7 F at 0 to 60 C 32 to 140 F Ambient 0 0218 C C 0 0218 F F Thermocouple 200 C to 1300 C 328 F to 2372 F 1 1 8 F 1 5 2 7 0 0367 C C 0 0367 F F Thermocouple 210 to 200 C 346 F 328 F 1 2 2 2 F 1 8 3 3 F 0 0424 C C 0 0424 F F Thermocouple T 230 C to 400 C 382 F to amp 752 F 1 1 8 F 1 5 2 7 F 0 0349 C C 0 0349 F F Thermocouple T 270 C to 230 C 454 F to 382 F 5 4 9 8 F 7 0 12 6 F 0 3500 0 3500 F F Thermocouple 230 C to 1370
100. iated and Conducted Emissions EN50081 2 Class A Publication 1769 UM004A EN P A 2 Specifications Input Specifications Publication 1769 UM004A EN P Specification Electrical EMC Value The module has passed testing at the following levels e ESD Immunity IEC61000 4 2 e 4 kV contact 8 kV air 4 kV indirect e Radiated Immunity IEC61000 4 3 e 10 V m 80 to 1000 MHz 80 amplitude modulation 900 MHz keyed carrier e Fast Transient Burst IEC61000 4 4 e 2 kV 5 2 e Surge Immunity IEC61000 4 5 e 1kV galvanic gun e Conducted Immunity IEC61000 4 6 e 10V 0 15 to 80MHz 2 1 Conducted Immunity frequency range may be 150 kHz to 30 MHz if the Radiated Immunity frequency range is 30 to 1000 MHz 2 For grounded thermocouples the 10V level is reduced to 3V Specification Number of Inputs Bus Current Draw max Value 6 input channels plus 2 CJC sensors 100 mA at 5V dc 40 mA at 24V dc Heat Dissipation 1 5 Total Watts The Watts per point plus the minimum Watts with all points energized Converter Type Response Speed per Channel Delta Sigma Input filter and configuration dependent See Effects of Filter Frequency on Channel Step Response on page 4 12 Rated Working Voltage 30V ac 30V dc Common Mode Voltage Range Common Mode Rejection 10V maximum per channel 115 dB minimum at 50 Hz with 10 Hz or 50 Hz filt
101. ience and Industry Vol 6 Schooley J F ed New York American Institute of Physics 1992 559 564 Publication 1769 UM004A EN P 18 Thermocouple Descriptions Publication 1769 UM004A EN P 24 Glawe G E Szaniszlo A J Long term drift of some noble and refractory metal thermocouples at 1600K in air argon and vacuum Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H H ed Pittsburgh Instrument Society of America 1972 1645 1662 25 Walker B E Ewing C T Miller Thermoelectric instability of some noble metal thermocouples at high temperatures Rev Sci Instrum 33 1029 1040 1962 26 Walker B E Ewing C T Miller R R Study of the instability of noble metal thermocouples in vacuum Sci Instrum 36 601 606 1965 27 Bedford E Ma C K Barber C R Chandler T R Quinn T J Burns G W Scroger M New reference tables for platinum 1096 rhodium platinum and platinum 1396 rhodium platinum thermocouples Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H H ed Pittsburgh Instrument Society of America 1972 1585 1603 28 Burns W Strouse G F Mangum B W Croarkin M Guthrie W Marcarino P Battuello M Lee K Kim J C Gam K S Rhee C Chattle M Arai M Sakurai H Pokhodun A I Moiseeva N P Perevalova S A de Groot M J Zhang J
102. ineering units x 1 data format is dependent on the range selected and the filter selected See Determining Effective Resolution and Range on page 4 14 Engineering Units x 10 When using a thermocouple input with this data format the module scales the input data to the actual temperature values for the selected thermocouple type With this format the module expresses temperatures in 1 C or 1 F units For millivolt inputs the module expresses voltages in 0 1 mV units Module Data Status and Channel Configuration 4 9 The resolution of the engineering units x 10 data format is dependent on the range selected and the filter selected See Determining Effective Resolution and Range on page 4 14 Scaled for PID The value presented to the controller is a signed integer with 0 representing the lower input range and 16383 representing the upper input range To obtain the value the module scales the input signal range to a 0 to 16383 range which is standard to the PID algorithm for the MicroLogix 1500 and other Allen Bradley controllers e g SLC For example if type J thermocouple is used the lowest temperature for the thermocouple is 210 C which corresponds to 0 counts The highest temperature in the input range 1200 C corresponds to 16383 counts Percent Range Input data is presented to the user as a percent of the specified range The module scales the input signal range to a 0 to 10000 range For example using a type
103. ing MicroLogix 1500 and RSLogix 500 This appendix examines the 1769 IT6 module s addressing scheme and describes module configuration using RSLogix 500 and a MicroLogix 1500 controller Module Addressing The following memory map shows the input and configuration image tables for the module Detailed information on the image table is located in Chapter 4 Memory Map Address Wor ted Word 1 te 2 Word 3 Input Image Word 4 4 Input Image 8 words Word 5 5 File Word6 Leb Over Under range Bits Word 7 7 Configuration Channel 0 Configuration Word Word 0 Refer to File Word 1 your 7 words Word 2 controller Configuration Word3 manual for File Word4 the Word 5 addresses Word 6 Bit 15 Bit 0 Publication 1769 UM004A EN P E 2 Module Configuration Using MicroLogix 1500 and RSLogix 500 For example to obtain the general status of channel 2 of the module located in slot e use address I e 6 2 Word a Ck e Element d M elimiter Bit Delimiter EI gt E e Compact 1 0 Slot Number NOTE The end cap does not use a slot address 1769 IT6 Configuration File The configuration file contains information you use to define the way a specific channel functions The configuration file is explained in more detail in Configuring Channels on page 4 4 The configuration file is modified u
104. input module Chapter 1 A quick start guide for experienced users Chapter 2 Installation and wiring guidelines Chapter 3 Module addressing configuration and status information Chapter 4 Information on module diagnostics and troubleshooting Chapter 5 Specifications for the input module Appendix A Information on understanding two s complement binary numbers Appendix B Thermocouple descriptions Appendix C Information on using the different types of thermocouple junctions Appendix D Configuration Using MicroLogix 1500 and RSLogix 500 Appendix E Configuration Using CompactLogix and RSLogix 5000 Appendix F Configuration Using 1769 ADN DeviceNet Adapter and RSNetworx Appendix G Definitions of terms used in this manual Glossary Publication 1769 UM004A EN P 2 Related Documentation The table below provides a listing of publications that contain important information about MicroLogix 1500 systems For Read this document Document number A user manual containing information on how to install MicroLogix 1500 User Manual 1764 UM001A US P use and program your MicroLogix 1500 controller An overview of 1769 Compact Discrete 1 0 modules 1769 Compact Discrete Input Output Modules Product 1769 2 1 Data An overview of the MicroLogix 1500 System including MicroLogix M 1500 System Overview 1764 S0001B EN P 1769 Compact 1 0 An overview of Compact 1 0 Compact 1 0 System Overview 1769 SO001A EN P A user manual that contains
105. ionally uniform and exhibit little variation between lots Below about 200 C the thermoelectric properties are affected more strongly by the presence of dilute transition metal solutes particularly iron The negative thermoelement TN or EN is a copper nickel alloy known ambiguously as constantan The word constantan refers to a family of copper nickel alloys containing anywhere from 45 to 60 percent copper These alloys also typically contain small percentages of cobalt manganese and iron as well as trace impurities of other elements such as carbon magnesium silicon etc constantan for type T thermocouples usually contains about 55 percent copper 45 percent nickel and small but thermoelectrically significant amounts about 0 1 percent or larger of cobalt iron or manganese It should be emphasized that type TN or EN thermoelements are NOT generally interchangeable with type JN thermoelements although they are all referred to as constantan In order to provide some differentiation in nomenclature type TN EN is often referred to as Adams or RP1080 constantan and type JN is usually referred to as SAMA constantan The thermoelectric relations for type TN and type EN thermoelements are the same that is the voltage versus temperature equations and tables for platinum versus type TN thermoelements apply to both types of thermoelements over the temperature range recommended for each thermocouple type However if should
106. ited Throughout this manual we use notes to make you aware of safety considerations ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention statements help you to e identify a hazard e avoid a hazard e recognize the consequences IMPORTANT Identifies information that is critical for successful application and understanding of the product MicroLogix RSLogix and RSLinx are trademarks of Rockwell Automation RSLogix and RSNetworx are trademarks of Rockwell Software Belden is a trademark of Belden Inc Table of Contents Preface Who Should Use This P 1 How to Use This Manual P 1 Manual P 1 Related P 2 Conventions Used in This P 2 Rockwell Automation Support P 3 Local Product 5 P 3 Technical Product P 3 Your Questions or Comments on the Manual P 3 Chapter 1 Overview General 1 1 Thermocouple mV Inputs and Ranges 1 1 Data de ot eR E SEED xo Red 1 2 Filter Frequencies sa a pea ES wep 1 2 Hardware Features
107. l when stripping wires Wire fragments that fall into a module could cause damage at power up At one end of the cable twist the drain wire and foil shield together bend them away from the cable and apply shrink wrap Then earth ground at the preferred location based on the type of sensor you are using See Grounding on page 3 9 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap Connect the signal wires to the terminal block Connect the other end of the cable to the analog input device Repeat steps 1 through 5 for each channel on the module NOTE See Appendix D Using Thermocouple Junctions for additional information on wiring grounded ungrounded and exposed thermocouple types Installation and Wiring 3 13 Wiring Diagram CJC sensor T grounded thermocouple ungrounded thermocouple within 10V de NOTE When using an ungrounded thermocouple the shield must be connected to ground at the module end IMPORTANT When using grounded and or exposed thermocouples that are touching electrically conductive material the ground potential between any two channels cannot exceed 10V dc or temperature readings will be inaccurate Cold Junction To obtain accurate readings from each of the channels the cold junction Compensation temperature temperature at the module s terminal junction between the thermocouple wire and the input channel must
108. le with 60 Hz Filter Channel 2 Input Type J Thermocouple with 60 Hz Filter From Table 4 7 Channel Update Time on page 4 34 Module Update Time without an Autocalibration Cycle Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time uses lowest thermocouple filter selected 53 ms 53 ms 53 ms 53 ms 212 ms Module Update Time during an Autocalibration Cycle Channel 0 Scan 1 Module Scan 1 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Ch 0 Gain Time 53 ms 53 ms 53 ms 53 ms 112 ms 324 ms Channel 0 Scan 3 Module Scan 2 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Ch 0 Offset Time 53 ms 53 ms 53 ms 53 ms 71 ms 283 ms Channel 1 Scan 1 no scan impact No autocalibration cycle is required because Channel 1 is the same Input Class as Channel 0 Data is updated in scan 3 Channel 2 Scan 1 Module Scan 3 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Ch 2 Gain Time 53 ms 53 ms 53 ms 53 ms 112 ms 324 ms Channel 2 Scan 2 Module Scan 4 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Ch 2 Offset Time 53 ms 53 ms 53 ms 53 ms 71 ms 283 ms CJC Scan 1 Module Scan 5 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Gain Time 53 ms 53 ms 53 ms 53 ms 112 ms 324 ms CJC Scan 2 Module Scan
109. lerances which are equal to approximately one half the standard tolerances given above Tolerances are not specified for type J thermocouples below 0 C or above 750 C The suggested upper temperature limit of 760 C given in the above ASTM standard 7 for protected type J thermocouples applies to AWG 8 3 25 mm wire For smaller diameter wires the suggested upper temperature limit decreases to 590 C for AWG 14 1 63 mm 480 C for AWG 20 0 81 mm 370 C for AWG 24 or 28 0 51 mm or 0 33 mm and 320 C for AWG 30 0 25 mm These temperature limits apply to thermocouples used in conventional closed end protecting tubes and they are intended only as a rough guide to the user They do not apply to sheathed thermocouples having compacted mineral oxide insulation This section describes Nickel Chromium Alloy Versus Nickel Aluminum Alloy thermocouples called type K thermocouples This type is more resistant to oxidation at elevated temperatures than types E J or T thermocouples and consequently it finds wide application at temperatures above 500 C The positive thermoelement KP which is the same as EP is an alloy that typically contains about 89 to 90 percent nickel 9 to about 9 5 percent chromium both silicon and iron in amounts up to about 0 5 percent plus smaller amounts of other constituents such as carbon manganese cobalt and niobium The negative thermoelement KN is typically composed of about 95 to 96 percent nickel 1 to 1
110. les Drill and tap the mounting holes for the recommended 4 or 8 Screw 5 Place the modules back on the panel and check for proper hole alignment 6 Attach the modules to the panel using the mounting screws If mounting more modules mount only the last one NOTE of this group and put the others aside This reduces remounting time during drilling and tapping of the next group 7 Repeat steps 1 to 6 for any remaining modules DIN Rail Mounting The module can be mounted using the following DIN rails e 35 x 7 5 mm EN 50 022 35 x 7 5 or e 35 x 15 mm EN 50 022 35 x 15 Before mounting the module on a DIN rail close the DIN rail latches Press the DIN rail mounting area of the module against the DIN rail The latches will momentarily open and lock into place The module can be replaced while the system is mounted to a panel Cor DIN rail Follow these steps in order 1 Remove power See important note on page 3 3 2 On the module to be removed remove the upper and lower mounting screws from the module or open the DIN latches using a flat blade or phillips style screwdriver 3 Move the bus lever to the right to disconnect unlock the bus Publication 1769 UM004A EN P 3 8 Installation and Wiring Field Wiring Connections Publication 1769 UM004A EN P On the right side adjacent module move its bus lever to the right unlock to disconnect it from the module to be removed Gently slide
111. lossary 2 filter frequency definition Glossary 2 effect on effective resolution 4 74 effect on noise rejection 4 11 effect on step response 4 12 selecting 4 11 finger safe terminal block 3 77 full scale definition Glossary 2 full scale range definition Glossary 2 G gain drift definition Glossary 2 general status bits 4 2 grounding 2 5 3 9 H hardware errors 5 5 heat considerations 3 4 input data formats engineering units x 1 4 8 engineering units x 10 4 8 percent range 4 9 raw proportional data 4 8 scaled for PID 4 9 input data scaling definition Glossary 2 Publication 1769 UM004A EN P input filter selection 4 11 input image definition Glossary 2 input module channel configuration 4 6 enable channel 4 7 input module status general status bits 4 2 over range flag bits 4 3 under range flag bits 4 4 input type range selection 4 9 installation getting started 2 7 grounding 2 5 3 9 heat and noise considerations 3 4 International Temperature Scale 1990 C 1 ITS 90 C 1 LED 5 1 linearity error definition Glossary 2 LSB definition Glossary 3 millivolt inputs range 1 1 module error field 5 4 module inhibit function 5 8 module scan time definition Glossary 3 module status data not valid 4 3 module update time 4 33 definition Glossary 3 mounting 3 6 3 7 multiplexer definition Glossary 3 negative decimal values B 2 noise rejection 4 77 normal mode rejection definition Glossary 3 number of sig
112. low Host Controller Compact 1 0 Compact 1 0 gt 2 E S c Compact 1 0 Compact 1 0 Panel Mounting Mount the module to a panel using two screws per module Use 4 or 8 panhead screws Mounting screws are required on every module Panel Mounting Using the Dimensional Template For more than 2 modules number of modules 1 X 35 mm 1 38 E 35 28 5 Refer to host controller documentation for this dimension 7 55 1 38 1 12 i 192 jeje 8 5 197 t e amp 2 2 a qu 122 6 0 2 E 5 S 5 c c c 4 826 0 008 NOTE All dimensions are in mm inches Hole spacing tolerance 0 04 mm 0 016 in 1 Fl 4 Replacing a Single Module within a System Installation and Wiring 3 7 Panel Mounting Procedure Using Modules as a Template The following procedure allows you to use the assembled modules as a template for drilling holes in the panel If you have sophisticated panel mounting equipment you can use the dimensional template provided on page 3 6 Due to module mounting hole tolerance it is important to follow these procedures 1 On a clean work surface assemble no more than three modules 2 Using the assembled modules as a template carefully mark the center of all module mounting holes on the panel 3 Return the assembled modules to the clean work surface including any previously mounted modu
113. matically on a system mode change from Program to Run for all configured channels or if any online configuration change is made to a channel In addition you can configure the module to perform autocalibration every 5 minutes during normal operation or you can disable this feature using the Enable Disable Cyclic Calibration function default is enabled This feature allows you to implement a calibration cycle anytime at your command by enabling and then disabling this bit P If you enable the cyclic autocalibration function the module update time increases when the autocalibration occurs To limit its impact on the module update time the autocalibration function is divided over two module scans The first part Coffset 0 of a channel calibration adds 71 ms and the second part gain span adds 112 ms to the module update This takes place over two consecutive module scans Each enabled channel requires a separate offset 0 and gain span cycle unless any channel to be scanned uses an Input Type of the same Input Class as any previously calibrated channel See the figure on page 4 33 and the Input Class table 1 Not all controllers allow online configuration changes Refer to your controller s user manual for details During an online configuration change input data for the affected channel is not updated by the module Module Data Status and Channel Configuration 4 35 below In that case offset and gain calibration values from the p
114. mponents or disconnect equipment unless power has been switched off or the area is known to be non hazardous Do not connect or disconnect components unless power has been switched off or the area is known to be non hazardous e This product must be installed in an enclosure e All wiring must comply with N E C article 501 4 b 1 Pollution Degree 2 is an environment where normally only non conductive pollution occurs except that occasionally a temporary conductivity caused by condensation shall be expected Over Voltage Category Il is the load level section of the electrical distribution system At this level transient voltages are controlled and do not exceed the impulse voltage capability of the product s insulation 8 Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission IEC designations Installation and Wiring 3 3 Prevent Electrostatic Discharge Electrostatic discharge can damage integrated circuits or ATTENTION semiconductors if you touch analog I O module bus connector pins or the terminal block on the input module Follow these guidelines when you handle the module e Touch a grounded object to discharge static potential e Wear an approved wrist strap grounding device Do not touch the bus connector or connector pins Do not touch circuit components inside the module e If available use a static safe work station e When it is not in use kee
115. n 1769 UM004A EN P C 22 Thermocouple Descriptions Publication 1769 UM004A EN P D Using a Grounded Junction Thermocouple Using Thermocouple Junctions This appendix describes the types of thermocouple junctions available and explains the trade offs in using them with the 1769 IT6 thermocouple mV analog input module Take care when choosing a thermocouple junction and connecting it from the environment to the module If you do not take adequate precautions for a given thermocouple type the electrical isolation of the module might be compromised Available thermocouple junctions are e grounded e ungrounded isolated e exposed With a grounded junction thermocouple the measuring junction is physically connected to the protective sheath forming a completely sealed integral junction If the sheath is metal electrically conductive there is electrical continuity between the junction and sheath The junction is protected from corrosive or erosive conditions The response time approaches that of the exposed junction type described in Using an Exposed Junction Thermocouple on page D 3 Measuring Junction E N Metal Sheath Connected to Sheath xtension Wire Se Nx N Publication 1769 UM004A EN P D 2 Using Thermocouple Junctions Using an Ungrounded Isolated Junction Thermocouple Publication 1769 UM004A EN P The shield input terminals for
116. n of each of these parameters and the choices available for each of them see Configuration Data File on page 4 5 Bit s Words 0 to 5 Parameter 0 to 2 Filter Frequency 4 Not Used 5and 6 Open Circuit Condition 7i Temperature Units Bit 8to 11 Input Type 12 to 14 Data Format 15 Enable Channel Bit Once you have entered your configuration selections for each channel enter your program logic save your project and download it to your CompactLogix Controller Your module configuration data is downloaded to your I O modules at this time Your 1769 IT6 module input data is located in the following tag addresses when the controller is in Run mode 1769 IT6 Channel Tag Address Local 1 Data 0 Local 1 Data 1 Local 1 Data 2 Local 1 1 Data 3 Local 1 Data 4 Local 1 Data 5 where 1 represents the slot number of the 1769 IT6 module ol wy NI Appendix G Configuring Your 1769 IT6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter This application example assumes your 1769 IT6 thermocouple input module is in a remote DeviceNet system controlled by a 1769 ADN DeviceNet adapter RSNetworx for DeviceNet is not only used to configure your DeviceNet network but is also used to configure individual I O modules in remote DeviceNet adapter systems For additional information on configuring your DeviceNet scanners and adapters please refer to the documen
117. nd reducing atmospheres unless suitably protected with protecting tubes They also should not be used in vacuum at high temperatures for extended times because the chromium and silicon in the positive thermoelement a nickel chromium silicon alloy vaporize out of solution and alter the calibration In addition their use in atmospheres with low but not negligible oxygen content is not recommended since it can lead to changes in calibration due to the preferential oxidation of chromium in the positive thermoelement Nevertheless Wang and Starr 49 studied the performances of type N thermocouples in reducing atmospheres as well as in stagnant air at temperatures in the 870 C to 1180 C range and found them to be markedly more stable thermoelectrically than type K thermocouples under similar conditions The performance of type N thermocouples fabricated in metal sheathed compacted ceramic insulated form also has been the subject of considerable study Anderson and others 51 Bentley and Morgan 52 and Wang and Bediones 53 have evaluated the high temperature thermoelectric stability of thermocouples insulated with magnesium oxide and sheathed in Inconel and in stainless steel Their studies showed that the thermoelectric instabilities of such assemblies increase rapidly with temperature above 1000 C It was found also that the smaller the diameter of the sheath the greater the instability Additionally thermocouples sheathed in Inconel
118. nd the SI volt was determined recently from new data obtained in an international collaborative effort involving eight national laboratories The results of this international collaboration were reported by Burns et al 28 The new function was used to compute the reference table given in this monograph Research 27 demonstrated that type S thermocouples can be used from 50 C to the platinum melting point temperature They may be used intermittently at temperatures up to the platinum melting point and continuously up to about 1300 C with only small changes in their calibrations The ultimate useful life of the thermocouples when used at such elevated temperatures is governed primarily by physical problems of impurity diffusion and grain growth which lead to mechanical failure The thermocouple is most reliable when used in a clean oxidizing atmosphere air but may be used also in inert gaseous atmospheres or in a vacuum for short periods of time However type B thermocouples are generally more suitable for such applications above 1200 C Type thermocouples should not be used in reducing atmospheres nor in those containing metallic vapor such as lead or zinc nonmetallic vapors such as arsenic phosphorus or sulfur or easily reduced oxides unless they are suitably protected with nonmetallic protecting tubes Also they should never be inserted directly into a metallic protection tube for use at high temperatures The stability of typ
119. nificant bits definition Glossary 3 0 open circuit detection 5 3 error bits 4 3 operation system 1 4 out of range detection 5 3 overall accuracy definition Glossary 3 over range flag bits 4 3 P panel mounting 3 6 3 7 positive decimal values B 1 power up diagnostics 5 2 power up sequence 1 4 program alteration 5 2 removing terminal block 3 10 replacing a module 3 7 resolution definition Glossary 3 S safety circuits 5 2 sampling time definition Glossary 3 scan time Glossary 3 spacing 3 6 specifications 1 start up instructions 2 7 status word definition Glossary 4 step response time definition Glossary 4 system operation 1 4 Index 3 T terminal block removing 3 10 wiring 3 11 terminal door label 3 10 terminal screw torque 3 11 thermocouple accuracy 4 definition Glossary 4 descriptions C 1 exposed junction D 3 grounded junction D 7 junction types D 1 repeatability A 3 ungrounded junction D 2 using junctions D 7 tools required for installation 2 7 troubleshooting safety considerations 5 7 two s complement binary numbers B 7 type B description C 1 temperature range 1 7 type C temperature range 7 7 type E description C 3 temperature range 1 7 type J description C 5 temperature range 1 7 type K description C 6 temperature range 7 7 type N description C 8 temperature range 7 7 type R description C 10 temperature range 7 7 type S description C 11 temper
120. nnel Enable 1 1 Anattempt to write any non valid spare bit configuration into any selection field results in a module configuration error NOTE Default settings for a particular function are indicated by zero s For example the default filter frequency is 60Hz Publication 1769 UM004A EN P Module Data Status and Channel Configuration 4 7 Enabling or Disabling a Channel Bit 15 You can enable or disable each of the six channels individually using bit 15 The module only scans enabled channels Enabling a channel forces it to be recalibrated before it measures input data Disabling a channel sets the channel data word to zero NOTE When a channel is not enabled 0 no input is provided to the controller by the A D converter This speeds up the response of the active channels improving performance Selecting Data Formats Bits 14 through 12 This selection configures channels 0 through 5 to present analog data in any of the following formats e Raw Proportional Data e Engineering Units x 1 e Engineering Units x 10 e Scaled for PID e Percent Range Table 4 2 Channel Data Word Format Data Format A Engineering Units x1 Engineering Units x10 Raw Percent ype oF oF Scaled for PID Proportional Range Data J 2100 to 12000 3460 to 21920 210 to 1200 346 to 2192 0 to 16383 32767 to 32767 0 to 10
121. not be assumed that type TN and type EN thermoelements may be used interchangeably or that they have the same commercial initial calibration tolerances The low temperature research 8 by members of the NBS Cryogenics Division showed that the type T thermocouple may be used down to liquid helium temperatures about 4K but that its Seebeck coefficient becomes quite small below 20K Its Seebeck coefficient at 20K is only about 5 64 V K being roughly two thirds that of the type E thermocouple The thermoelectric homogeneity of most type TP and type TN or EN thermoelements is reasonably good There is considerable variability however in the thermoelectric properties of type TP thermoelements below about 70K caused by variations in the amounts and types of impurities present in these nearly pure materials The high thermal conductivity of the type TP thermoelements can also be troublesome in precise applications For these reasons type T thermocouples are generally unsuitable for use below about 20K Type E thermocouples are recommended as the most suitable of the letter designated thermocouple types for general low temperature use since they offer the best overall combination of desirable properties Thermocouple Descriptions C 15 Type T thermocouples are recommended by the ASTM 5 for use in the temperature range from 200 C to 370 C in vacuum or in oxidizing reducing or inert atmospheres The suggested upper temperature limit for continuo
122. nsw Description j Output o XR iz Configuration o 16 bit Comm Format JinputData INT e Slot 1 IN At this point you may click Finish to complete the configuration of your I O module Configure each I O module in this manner The CompactLogix5320 controller supports a maximum of 8 I O modules The valid slot numbers to select when configuring I O modules are 1 through 8 Once you have created a Generic Profile for 1769 IT6 Thermocouple module you must enter configuration information into the Tag database that is automatically created from the Generic Profile information you entered This configuration information is downloaded to each module at program download at power up and when an inhibited module is uninhibited First enter the Controller Tag database by double clicking on Controller Tags in the upper portion of the Controller Organizer Based on the Generic Profile created earlier for 1769 IT6 module the Controller Tags screen looks like the following Configuring Your 1769 IT6 Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 F 5 151 5 Controller Generic Profile Controller Tags Generic Profile controller n x Generic Profile cont BhowAl e o Tag addresses are automatically created for configured I O modules AII local I O addresses are preceded by the word Local These a
123. nt The negative thermoelement a copper nickel alloy is subject to substantial composition changes under thermal neutron irradiation since copper is converted to nickel and zinc Iron undergoes a magnetic transformation near 769 C and an alpha gamma crystal transformation near 910 C 6 Both of these transformations especially the latter seriously affect the thermoelectric properties of iron and therefore of type J thermocouples This behavior and the rapid oxidation rate of iron are the main reasons why iron versus constantan thermocouples are not recommended as a standardized type above 760 C If type J thermocouples are taken to high temperatures especially above 900 C they will lose the accuracy of their calibration when they are recycled to lower temperatures If type J thermocouples are used in air at temperatures above 760 C only the largest wire AWG 8 3 3 mm should be used and they should be held at the measured temperature for 10 to 20 minutes before readings are taken The thermoelectric voltage of the type J thermocouples may change by as much as 40uV or 0 6 C equivalent per minute when first brought up to temperatures near 900 C ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type J commercial thermocouples be 2 2 or 0 75 percent whichever is greater between 0 and 750 C Type J thermocouples can also be supplied to meet special to
124. o ground as short as possible e Ground the shield drain wire at one end only The preferred location is as follows For grounded thermocouples or millivolt sensors this is at the sensor end For insulated ungrounded thermocouples this is at the module end Contact your sensor manufacturer for additional details e Refer to Industrial Automation Wiring and Grounding Guidelines Allen Bradley publication 1770 4 1 for additional information The terminal connections with CJC sensors are shown below NC IN 0 IN 0 IN 1 IN 1 Publication 1769 UM004A EN P 2 6 Quick Start for Experienced Users Step 4 Configure the module Reference Chapter 4 Module Data Status and Channel Configuration The configuration file is typically modified using the programming software compatible with your controller It can also be modified through the control program if supported by the controller See Channel Configuration on page 4 6 for more information Step 5 Go through the startup procedure Reference Chapter 5 Diagnostics and Troubleshooting 1 Apply power to the controller system 2 Download your program which contains the thermocouple module configuration settings to the controller 3 Put the controller in Run mode During a normal start up the module status LED turns on NOTE If the module status LED does not turn on cycle power If the condition persists contact your local di
125. ocouple Temperature C Figure A 22 Module Temperature Drift Using Type J Thermocouple 0 025 0 020 0 015 0 010 0 005 400 200 0 200 400 600 800 1000 1200 Thermocouple Temperature C Temperature Drift C C Temperature Drift C C Specifications A 25 Figure A 23 Module Temperature Drift Using Type K Thermocouple 0 5 0 4 0 3 0 2 0 1 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C Figure A 24 Module Temperature Drift Using Type N Thermocouple 0 05 0 04 0 03 0 02 0 400 200 0 200 400 600 800 1000 1200 1400 Thermocouple Temperature C Publication 1769 UM004A EN P A 26 Specifications Figure A 25 Module Temperature Drift Using Type R Thermocouple 0 07 0 06 o 0 05 S i 0 04 a g 8 0 03 2 S 0 02 0 01 0 0 200 400 600 800 1000 1200 1400 1600 1800 Thermocouple Temperature C Figure A 26 Module Temperature Drift Using Type S Thermocouple 0 07 0 06 o 0 05 e i 0 04 a g z 0 03 2 S 002 0 01 0 200 400 600 800 1000 1200 1400 1600 1800 Thermocouple Temperature Publication 1769 UM004A EN P Temperature Drift C C Specifications 27 Figure A 27 Module Temperature Drift Using Type T Thermocouple 0 4 0 3 0 2 0 1 300 200 100 0 100 200 300 400 Thermocouple Temperature C Publication 1769 UMO004A EN P A 28 Specifications Publication 1769 UM004A EN P B Positive Decimal
126. odule s heat dissipation specification In addition route shielded twisted pair analog input wiring away from any high voltage I O wiring Power Supply Distance You can install as many modules as your power supply can support However all 1769 I O modules have a power supply distance ratings The maximum I O module rating is 8 which means that a module may not be located more than 8 modules away from the system power supply Compact 1 0 Compact 1 0 Compact 1 0 Compact 1 0 Compact 1 0 Compact 1 0 Compact 1 0 Compact 1 0 1 2 3 4 5 6 7 8 Power Supply Distance OR 1 0 Communication Adapter Compact 1 0 Compact 1 0 Compact 1 0 System Power Supply Compact 1 0 Compact 1 0 Compact 1 0 2 Power Supply Distance The module can be attached to the controller or an adjacent I O module before or after mounting For mounting instructions see Panel Mounting Using the Dimensional Template on page 3 6 or DIN Rail Mounting on page 3 7 To work with a system that is already mounted see Replacing a Single Module within a System on page 3 7 Installation and Wiring 3 5 The following procedure shows you how to assemble the Compact I O system 1 Disconnect power 2 Check that the bus lever of the module to be installed is in the unlocked fully right position If the module is being installed to the left of an existing module check that the right side adjacent module s bus lever is in the unlocked fully
127. ol and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application Because it is a start up guide for experienced users this chapter does not contain detailed explanations about the procedures listed It does however reference other chapters in this book where you can get more information about applying the procedures described in each step If you have any questions or are unfamiliar with the terms used or concepts presented in the procedural steps always read the referenced chapters and other recommended documentation before trying to apply the information Have the following tools and equipment ready e medium blade or cross head screwdriver e thermocouple or millivolt analog input device e shielded twisted pair cable for wiring Belden 8761 or equivalent for millivolt inputs or shielded thermocouple extension wire for thermocouple inputs e controller for example a MicroLogix 1500 or CompactLogix controller e programming device and software for example RSLogix 500 or RSLogix 5000 Publication 1769 UM004A EN P 2 2 Quick Start for Experienced Users What You Need To Do This chapter covers 1 Ensuring that your power supply is adequate 2 Attaching and locking the module 3 Wiring the module Configuring the module 5 Going through the startup procedure 6 Monitoring module operation Step 1 Ensure that your 1769 sy
128. ominal chemical composition of its positive SP thermoelement platinum 10 percent rhodium The negative SN thermoelement is commercially available platinum that has a nominal purity of 99 99 percent 21 An industrial consensus standard CASTM E1159 87 specifies that rhodium having a nominal purity of 99 98 percent shall be alloyed with platinum of 99 99 percent purity to produce the positive thermoelement which typically contains 10 00 0 05 percent rhodium by weight The consensus standard 21 describes the purity of commercial type S materials that are used in many industrial thermometry applications and that meet the calibration tolerances described later in this section It does not cover however the higher purity reference grade Publication 1769 UM004A EN P C 12 Thermocouple Descriptions Publication 1769 UM004A EN P materials that traditionally were used to construct thermocouples used as standard instruments of the IPTS 68 as transfer standards and reference thermometers in various laboratory applications and to develop reference functions and tables 27 28 The higher purity alloy material typically contains less than 500 atomic ppm of impurities and the platinum less than 100 atomic ppm of impurities 27 Difference between such high purity commercial material and the platinum thermoelectric reference standard Pt 67 are described in 27 and 28 A reference function for the type S thermocouple based on the ITS 90 a
129. on 1769 UM004A EN P status word Contains status information about the channel s current configuration and operational state You can use this information in your ladder program to determine whether the channel data word is valid step response time The time required for the channel data word signal to reach a specified percentage of its expected final value given a full scale step change in the input signal thermocouple A temperature sensing device consisting of a pair of dissimilar conductors welded or fused together at one end to form a measuring junction The free ends are available for connection to the reference cold junction A temperature difference between the junctions must exist for the device to function update time see module update time Index Numerics 3 dB frequency 4 12 A A D definition Glossary 1 abbreviations Glossary 1 accuracy A 4 analog input module overview 1 1 5 1 attenuation cut off frequency 4 12 definition Glossary 1 autocalibration module update time 4 34 before you begin 2 7 bus connector definition Glossary 1 locking 3 5 bus interface 1 4 C calibration 1 5 calibration cyclic 4 14 channel definition Glossary 1 channel configuration 4 4 channel configuration word 4 6 channel diagnostics 5 3 channel status LED 1 4 channel step response effects of filter frequency 4 12 channel update time definition Glossary 1 CJC definition Glossary 1 CJC sensors err
130. oper earth ground may be a source of common mode noise Transducer power supply noise transducer circuit noise or process variable irregularities may also be sources of normal mode noise The filter frequency of the module s CJC sensors is the lowest filter frequency of any enabled thermocouple type to maximize the trade offs between effective resolution and channel update time Publication 1769 UM004A EN P 4 12 Module Data Status and Channel Configuration Publication 1769 UM004A EN P Effects of Filter Frequency on Channel Step Response The selected channel filter frequency determines the channel s step response The step response is the time required for the analog input signal to reach 100 of its expected final value given a full scale step change in the input signal This means that if an input signal changes faster than the channel step response a portion of that signal will be attenuated by the channel filter The channel step response is calculated by a settling time of 3 x 1 filter frequency Table 4 4 Filter Frequency and Step Response Filter Frequency Step Response Uu 30m 50 Hz 60 ms 60 Hz 50 ms 250 Hz 12ms 500 Hz 6 ms 1 kHz 3ms Channel Cut Off Frequency The filter cut off frequency 3 dB is the point on the frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation The following table shows cut off frequencie
131. or indication 4 3 general status bits 4 2 input frequency 4 11 location 1 3 module operation 1 4 open circuit condition 4 70 over range flag 4 3 terminal connections 2 5 under range flag 4 4 wiring 3 13 CMRR See common mode rejection ratio common mode rejection 4 77 definition Glossary 1 common mode rejection ratio definition Glossary 1 common mode voltage definition Glossary 1 common mode voltage range definition Glossary 1 common mode voltage rating 4 11 configuration errors 5 5 configuration word definition Glossary 1 contacting Rockwell Automation 5 8 cut off frequency 4 12 definition Glossary 2 D data not valid condition 4 3 data word definition Glossary 2 dB definition Glossary 2 decibel See dB definition of terms Glossary 1 differential mode rejection See normal mode rejection digital filter definition Glossary 2 DIN rail mounting 3 7 E effective resolution at available filter frequencies 4 14 4 33 definition Glossary 2 electrical noise 3 4 EMC Directive 3 7 end cap terminator 2 3 3 5 equipment required for installation 2 7 error codes 5 6 error definitions 5 4 Publication 1769 UM004A EN P 2 Index errors configuration 5 5 critical 5 4 extended error information field 5 5 hardware 5 5 module error field 5 4 non critical 5 4 European Union Directives 3 7 extended error codes 5 6 extended error information field 5 5 F fault condition at power up 7 4 filter definition G
132. osil nisil Journal of Testing and Evaluation 8 4 192 198 1980 18 Starr C D Wang T P Effect of oxidation on stability of thermocouples Proceedings of the American Society for Testing and Materials Nol 63 1185 1194 1963 19 Bentley R E Short term instabilities in thermocouples containing nickel based alloys Higb Temperatures High Pressures 15 599 611 1983 20 Kollie T G Horton J L Carr K R Herskovitz M B Mossman C A Temperature measurement errors with type K Chromel vs AlumeD thermocouples due to short ranged ordering in Chromel Rev Sci Instrum 46 1447 1461 1975 21 ASTM American Society for Testing and Materials Standard E1159 87 1992 Annual Book of ASTM Standards Vol 14 03 Philadelphia ASTM 1992 388 389 22 Bedford R E Ma C K Barber C R Chandler T R Quinn T J Burns G W Scroger M New reference tables for platinum 1096 rhodium platinum and platinum 1396 rhodium platinum thermocouples Temperature Its Measurement and Control in Science and Industry Vol 4 Part 3 p 1585 Plumb H H ed Pittsburgh Instrument Society of America 1972 23 Burns W Strouse G Mangum B W Croarkin M C Guthrie W F Chattle M New reference functions for platinum 13 rhodium versus platinum type R and platinum 30 rhodium versus platinum 6 rhodium type B thermocouples based on the ITS 90 in Temperature Its Measurement and Control in Sc
133. ower supply commons must be connected Terminal Block Do not use the module s NC terminals as connection points Do not tamper with or remove the CJC sensors on the terminal block Removal of either one or both sensors will reduce accuracy For millivolt sensors use Belden 8761 shielded twisted pair wire Cor equivalent to ensure proper operation and high immunity to electrical noise e For a thermocouple use the shielded twisted pair thermocouple extension lead wires specified by the thermocouple manufacturer Using the incorrect type of thermocouple extension wire or not following the correct polarity will cause invalid readings e To ensures optimum accuracy limit overall cable impedance by keeping a cable as short as possible Locate the module as close to input devices as the application permits Quick Start for Experienced Users 2 5 Grounding ATTENTION The possibility exists that a grounded or exposed thermocouple can become shorted to a potential greater than that of the thermocouple itself Due to possible shock hazard take care when wiring grounded or exposed thermocouples See Appendix D Using Thermocouple Junctions e This product is intended to be mounted to a well grounded mounting surface such as a metal panel Additional grounding connections from the module s mounting tabs or DIN rail if used are not required unless the mounting surface cannot be grounded e Keep cable shield connections t
134. p the module in its static shield bag Remove Power ATTENTION Remove power before removing or inserting this module When you remove or insert a module with power applied an electrical arc may occur An electrical arc can cause personal injury or property damage by e sending an erroneous signal to your system s field devices causing unintended machine motion e causing an explosion in a hazardous environment Electrical arcing causes excessive wear to contacts on both the module and its mating connector and may lead to premature failure Selecting a Location Reducing Noise Most applications require installation in an industrial enclosure to reduce the effects of electrical interference Analog inputs are highly susceptible to electrical noise Electrical noise coupled to the analog inputs will reduce the performance accuracy of the module Publication 1769 UM004A EN P 3 4 Installation and Wiring MicroLogix 1500 Controller with Integrated System Power Supply System Assembly Publication 1769 UM004A EN P Group your modules to minimize adverse effects from radiated electrical noise and heat Consider the following conditions when selecting a location for the analog module Position the module e away from sources of electrical noise such as hard contact switches relays and AC motor drives e away from modules which generate significant radiated heat such as the 1769 IA16 Refer to the m
135. rd 7 even numbered bits They apply to all input types When set 1 the over range flag bit indicates an input signal that is at the maximum of its normal operating range for the represented channel or sensor The module automatically resets 0 the bit when the data value falls below the maximum for that range Publication 1769 UM004A EN P 4 4 Data Status and Channel Configuration Configuring Channels Publication 1769 UM004A EN P Under Range Flag Bits 00 U7 Under range bits for channels 0 through 5 and the CJC sensors are contained in word 7 odd numbered bits They apply to all input types When set 1 the under range flag bit indicates an input signal that is at the minimum of its normal operating range for the represented channel or sensor The module automatically resets 0 the bit when the under range condition is cleared and the data value is within the normal operating range After module installation you must configure operation details such as thermocouple type temperature units etc for each channel Channel configuration data for the module is stored in the controller configuration file which is both readable and writable The configuration data file is shown below Bit definitions are provided in Channel Configuration on page 4 6 Detailed definitions of each of the configuration parameters follow the table Configuration Data File Module Data Status and Channel Configuration 4 5 The d
136. revious channel are used and no additional time is required Table 4 8 Input Class Input Type Input Class Thermocouples B C R S and T 1 Thermocouples E J K and N 50 mV 100 mV CJC Sensors A jl N N Calculating Module Update Time To determine the module update time add the individual channel update times for each enabled channel and the CJC update time if any of the channels are enabled as thermocouple inputs EXAMPLE 1 Two Channels Enabled for Millivolt Inputs Channel 0 50 mV with 60 Hz filter Channel 1 Input 50 mV with 500 Hz filter From Table 4 7 Channel Update Time on page 4 34 Module Update Time Ch 0 Update Time Ch 1 Update Time 53 ms 9 ms 62 ms EXAMPLE 2 Three Channels Enabled for Different Inputs Channel 0 Input Type J Thermocouple with 10 Hz filter Channel 1 Input Type J Thermocouple with 60 Hz filter Channel 2 Input 100 mV with 250 Hz filter From Table 4 7 Channel Update Time on page 4 34 Module Update Time Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time uses lowest thermocouple filter selected 303 ms 53 ms 15 ms 303 ms 674 ms Publication 1769 UM004A EN P 4 36 Module Data Status and Channel Configuration EXAMPLE 3 Three Channels Enabled for Different Inputs with Cyclic Calibration Enabled Channel 0 Input Type T Thermocouple with 60 Hz Filter Channel 1 Input Type T Thermocoup
137. rmation Hardware Errors 001 General and specific hardware error codes are specified in the extended error information field Configuration 010 Module specific error codes are indicated in the Errors extended error field These error codes correspond to options that you can change directly For example the input range or input filter selection Diagnostics and Troubleshooting 5 5 Extended Error Information Field Check the extended error information field when a non zero value is present in the module error field Depending upon the value in the module error field the extended error information field can contain error codes that are module specific or common to all 1769 analog modules If no errors are present in the module error field the extended error information field is set to zero Hardware Errors General or module specific hardware errors are indicated by module error code 001 See Table 5 3 Extended Error Codes on page 5 6 Configuration Errors If you set the fields in the configuration file to invalid or unsupported values the module generates a critical error Table 5 3 Extended Error Codes on page 5 6 lists the possible module specific configuration error codes defined for the modules Publication 1769 UM004A EN P 5 6 Diagnostics and Troubleshooting Error Codes Table 5 3 Extended Error Codes The table below explains the extended error code
138. rmocouple Temperature F Publication 1769 UMO004A EN P A 22 Specifications Publication 1769 UM004A EN P Accuracy C Accuracy F Figure A 18 Module Accuracy at 25 C 77 F Ambient forType T Thermocouple Using 250 500 and 1 kHz Filter 300 200 100 0 100 200 300 400 Thermocouple Temperature C 500 400 300 200 100 0 100 200 300 400 500 600 700 800 Thermocouple Temperature F Temperature Drift Temperature Drift C C Temperature Drift C C Specifications 23 The graphs below show the module s temperature drift without autocalibration for each thermocouple type over the thermocouple s temperature range assuming terminal block temperature is stable The affects of CJC temperature drift are not included Figure A 19 Module Temperature Drift Using Type B Thermocouple 0 12 0 10 0 08 0 06 0 04 0 02 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Thermocouple Temperature C Figure A 20 Module Temperature Drift Using Type C Thermocouple 0 10 0 09 0 08 0 07 0 06 0 05 0 04 0 03 0 02 0 01 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 Thermocouple Temperature C Publication 1769 UM004A EN P A 24 Specifications Publication 1769 UM004A EN P Temperature Drift Temperature Drift C C Figure A 21 Module Temperature Drift Using Type E Thermocouple 0 30 0 25 0 20 0 15 0 10 0 05 400 200 0 200 400 600 800 1000 Therm
139. rsonnel remain clear of the equipment The problem could be intermittent and sudden unexpected machine motion could occur Have someone ready to operate an emergency stop switch in case it becomes necessary to shut off power Publication 1769 UM004A EN P 5 2 Diagnostics and Troubleshooting Module Operation vs Channel Operation Power up Diagnostics Publication 1769 UM004A EN P Program Alteration There are several possible causes of alteration to the user program including extreme environmental conditions Electromagnetic Interference EMD improper grounding improper wiring connections and unauthorized tampering If you suspect a program has been altered check it against a previously saved master program Safety Circuits Circuits installed on the machine for safety reasons like over travel limit switches stop push buttons and interlocks should always be hard wired to the master control relay These devices must be wired in series so that when any one device opens the master control relay is de energized thereby removing power to the machine Never alter these circuits to defeat their function Serious injury or machine damage could result The module performs diagnostic operations at both the module level and the channel level Module level operations include functions such as power up configuration and communication with a 1769 bus master such as a MicroLogix 1500 controller 1769 ADN DeviceNet Adapter or Compa
140. s Using 10 50 and 60 Hz Filters 400 600 800 1000 Temperature 1200 1400 1600 1800 500 1000 1500 Temperature F 2000 2500 3000 Publication 1769 UMO004A EN P 4 30 Module Data Status and Channel Configuration Figure 4 17 Effective Resolution Versus Input Filter Selection for Type S Thermocouples Using 250 500 and 1k Hz Filters 120 100 80 60 40 Effective Resolution 20 0 200 400 600 800 1000 1200 1400 1600 1800 Temperature C 200 180 160 140 120 100 80 60 40 20 Effective Resolution F 500 1000 1500 2000 2500 3000 Temperature Publication 1769 UM004A EN P Effective Resolution C Effective Resolution F Module Data Status and Channel Configuration 4 31 Figure 4 18 Effective Resolution Versus Input Filter Selection for Type T Thermocouples Using 10 50 and 60 Hz Filters 300 200 100 0 100 200 300 400 Temperature C N wo A ot Oc 0 500 400 300 200 100 0 100 200 300 400 500 600 700 800 Temperature F Publication 1769 UM004A EN P 4 32 Module Data Status and Channel Configuration Figure 4 19 Effective Resolution Versus Input Filter Selection for Type T Thermocouples Using 250 500 and 1k Hz Filters 80 70 60 50 40 30 Effective Resolution 20 10 0 300 200 100 0 100 200 300 400 140 120 100
141. s for the supported filters Table 4 5 Filter Frequency versus Channel Cut off Frequency Filter Frequency Cut off Frequency 10 Hz 2 62 Hz 50 Hz 13 1 Hz 60 Hz 157 Hz 250 Hz 65 5 Hz 500 Hz 131 Hz 1 kHz 262 Hz All input frequency components at or below the cut off frequency are passed by the digital filter with less than 3 dB of attenuation AII frequency components above the cut off frequency are increasingly attenuated as shown in the graphs on page 4 13 Gain dB Gain dB 10 Hz Input Filter Frequency Figure 4 1 Frequency Response Graphs 3dB 20 30 Freq uency Hz 40 60 Hz Input Filter Frequency 3 dB 120 180 240 Frequency Hz Hz Input Filter Frequency 300 360 3 dB Gain dB 0 500 Y 131Hz 1000 Freque 1500 ncy Hz 2000 2500 3000 Gain dB Module Data Status and Channel Configuration 50 Hz Input Filter Frequency 4 13 3dB E 300 100 150 Frequency Hz 200 250 250 Hz Input Filter Frequency ea O lt 200 I 0 250 500 750 900 1150 1
142. sing the programming software configuration screen For an example of module configuration using RSLogix 500 see Configuring the 1769 IT6 in a MicroLogix 1500 System on page E 3 Table 5 1 Software Configuration Channel Defaults Parameter Disable Enable Channel Default Setting Disable Filter Frequency Input Type 60 Hz Thermocouple Type J Data Format Temperature Units Raw Proportional Open Circuit Response Disable Cyclic Calibration Upscale Enable 1 May be overridden by the software Publication 1769 UM004A EN P Configuring the 1769 1 6 in a MicroLogix 1500 System Module Configuration Using MicroLogix 1500 and RSLogix 500 This example takes you through configuring your 1769 IT6 thermocouple mV input module with RSLogix 500 programming software assumes your module is installed as expansion I O in a MicroLogix 1500 system and that RSLinx is properly configured and a communications link has been established between the MicroLogix processor and RSLogix 500 Start RSLogix and create a MicroLogix 1500 application The following screen appears RSLogix 500 Untitled Pale Es File Edit View Search Comms Tools Window Help DaS cjuo 1 6666 Diver AB DFTA 14 Se User X A rewound K Compare RETE Bf x E1483 Project 8 Help Eg Controller i Controller Properties C Processor
143. stem power supply Reference has sufficient current output to support your system configuration Chapter 3 Installation and Wiring The modules maximum current draw is shown below 5V dc 24V dc 100 mA 40 mA The module cannot be located more than 7 modules away from the system power supply 1 The system power supply could be a 1769 PA2 PB2 PA4 PB4 or the internal supply of the MicroLogix 1500 packaged controller Step 2 Attach and lock the module Reference Chapter 3 Installation and Wiring Publication 1769 UM004A EN P The module can be panel or DIN rail mounted Modules can be assembled before or after mounting ATTENTION Remove power before removing or inserting this module If you remove or insert a module with power applied an electrical arc may occur Quick Start for Experienced Users 2 3 Check that the bus lever of the module to be installed is in the unlocked fully right position Use the upper and lower tongue and groove slots 1 to secure the modules together or to a controller Move the module back along the tongue and groove slots until the bus connectors 2 line up with each other Push the bus lever back slightly to clear the positioning tab 3 Use your fingers or a small screwdriver To allow communication between the controller and module move the bus lever fully to the left 4 until it clicks Ensure it is locked firmly in place ATTENTION
144. stributor or Rockwell Automation for assistance Step 6 Monitor the module status to check if the Reference module is operating correctly Chapter 5 Diagnostics and Troubleshooting Publication 1769 UM004A EN P Module and channel configuration errors are reported to the controller These errors are typically reported in the controller s I O status file Channel status data is also reported in the module s input data table so these bits can be used in your control program to flag a channel error Compliance to European Union Directives Chapter J Installation and Wiring This chapter tells you how to e determine the power requirements for the modules e avoid electrostatic damage e install the module e wire the module s terminal block e wire input devices This product is approved for installation within the European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive The 1769 IT6 module is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility CEMC and the following standards in whole or in part documented in a technical construction file e EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment e EN 50082 2 EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Low Voltage Directive This product is tested to meet Council Directive
145. tal panel Additional grounding connections from the module s mounting tabs or DIN rail Gf used are not required unless the mounting surface cannot be grounded e Keep cable shield connections to ground as short as possible e Ground the shield drain wire at one end only The typical location is as follows For grounded thermocouples or millivolt sensors this is at the sensor end For insulated ungrounded thermocouples this is at the module end Contact your sensor manufacturer for additional details e If it is necessary to connect the shield drain wire at the module end connect it to earth ground using a panel or DIN rail mounting screw e Refer to Industrial Automation Wiring and Grounding Guidelines Allen Bradley publication 1770 4 1 for additional information Publication 1769 UM004A EN P 3 10 Installation and Wiring Publication 1769 UM004A EN P Noise Prevention To limit the pickup of electrical noise keep thermocouple and millivolt signal wires as far as possible from power and load lines e If noise persists for a device try grounding the opposite end of the cable shield You can only ground one end at a time Terminal Door Label A removable write on label is provided with the module Remove the label from the door mark your unique identification of each terminal with permanent ink and slide the label back into the door Your markings ID tag will be visible when the module door is closed
146. tation for these products including the Compact I O 1769 ADN DeviceNet Adapter user s manual publication 1769 UM001A US P The adapter manual also contains examples on how to modify I O module configuration with Explicit Messages while the system is running Whether you are configuring an 1 O module offline and downloading to the adapter or you accomplish the configuration online the 1769 IT6 Thermocouple module must be configured prior to configuring the DeviceNet adapter in the DeviceNet scanner s scanlist The only ways to configure or re configure I O modules after the adapter is placed in the scanners scanlist are via Explicit Messages or by removing the adapter from the scanner s scanlist modifying the configuration of the I O module then adding the adapter back into the scanner s scanlist This example takes you through configuring your 1769 IT6 Thermocouple Input module with RSNetworx for DeviceNet version 3 00 or later prior to adding your adapter to the scanlist of your DeviceNet scanner Publication 1769 UM004A EN P 6 2 Configuring Your 1769 IT6 Module in a Remote DeviceNet System with a 1769 ADN DeviceNet Adapter Start RSNetworx for DeviceNet The following screen appears Edit View Network Device Tools Help EE als S X ale E Hardware x Vendor Rockwell Automation Allen Bradley
147. tection Whenever a channel configuration word is improperly defined the module reports an error See pages 5 4 to 5 7 for a description of module errors Over or Under Range Detection Whenever the data received at the channel word is out of the defined operating range an over range or under range error is indicated in input data word 7 Possible causes of an out of range condition include e The temperature is too hot or too cold for the type of thermocouple being used e The wrong thermocouple is being used for the input type selected or for the configuration that was programmed e The input device is faulty e The signal input from the input device is beyond the scaling range Open Circuit Detection On each scan the module performs an open circuit test on all enabled channels Whenever an open circuit condition occurs the open circuit bit for that channel is set in input data word 6 Possible causes of an open circuit include e the input device is broken wire is loose or cut e the input device is not installed on the configured channel e A thermocouple is installed incorrectly Publication 1769 UM004A EN P 5 4 Diagnostics and Troubleshooting Non critical vs Critical Module Errors Module Error Definition Table Table 5 1 Module Error Table Non critical module errors are typically recoverable Channel errors over range or under range errors are non critical Non critical error conditions are in
148. that reason they are being used more often whenever environmental conditions permit Type E thermocouples are recommended by the ASTM 5 for use in the temperature range from 200 C to 900 C in oxidizing or inert atmospheres If used for extended times in air above 500 C heavy gauge wires are recommended because the oxidation rate is rapid at elevated temperatures About 50 years ago Dahl 11 studied the thermoelectric stability of EP and EN type alloys when heated in air at elevated temperatures His work should be consulted for details More recent stability data on these alloys in air were reported by Burley et al 13 Type E thermocouples should not be used at high temperatures in sulfurous reducing or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes They also should not be used in vacuum at high temperatures for extended times because the Publication 1769 UM004A EN P C 4 Thermocouple Descriptions Publication 1769 UM004A EN P chromium in the positive thermoelement a nickel chromium alloy vaporizes out of solution and alters the calibration In addition their use in atmospheres that promote green rot corrosion of the positive thermoelement should be avoided Such corrosion results from the preferential oxidation of chromium in atmospheres with low but not negligible oxygen content and can lead to a large decrease in the thermoelectric voltage of the thermocouple with time
149. the A D converter can provide valid properly configured data to the 1769 bus master controller The following information highlights the bit operation of the Data Not Valid condition 1 The default and module power up bit condition is reset 0 2 The bit condition is set 1 when a new configuration is received and determined valid by the module The set 1 bit condition remains until the module begins converting analog data for the previously accepted new configuration When conversion begins the bit condition is reset 0 The amount of time it takes for the module to begin the conversion process depends on the number of channels being configured and the amount of configuration data downloaded by the controller If the new configuration is invalid the bit function remains reset 0 and the module posts a configuration error See Configuration Errors on page 5 5 3 If A D hardware errors prevent the conversion process from taking place the bit condition is set 1 Open Circuit Flag Bits 0 0 to 0C7 Bits through 5 of word 6 contain open circuit error information for channels 0 through 5 respectively Errors for the CJC sensors are indicated in OC6 and OC7 The bit is set 1 when an open circuit condition exists See Open Circuit Detection on page 5 3 for more information on open circuit operation Over Range Flag Bits 00 to 07 Over range bits for channels 0 through 5 and the CJC sensors are contained in wo
150. the other base metal types do not have specific chemical compositions given in standards rather any materials whose emf temperature relationship agrees with that of the specified reference table within certain tolerances can be considered to be a type E thermocouple The positive thermoelement EP is the same material as KP The negative thermoelement EN is the same material as TN The low temperature research 8 by members of the NBS Cryogenics Division showed that type E thermocouples are very useful down to liquid hydrogen temperatures n b p about 20 3K where their Seebeck coefficient is about 8mV C They may even be used down to liquid helium temperatures 4 2 K although their Seebeck coefficient becomes quite low only about 2mV C at 4K Both thermoelements of type E thermocouples have a relatively low thermal conductivity good resistance to corrosion in moist atmospheres and reasonably good homogeneity For these three reasons and their relatively high Seebeck coefficients type E thermocouples have been recommended 8 as the most useful of the letter designated thermocouple types for low temperature measurements For measurements below 20K the non letter designated thermocouple KP versus gold 0 07 is recommended The properties of this thermocouple have been described by Sparks and Powell 12 Type E thermocouples also have the largest Seebeck coefficient above 0 for any of the letter designated thermocouples For
151. through 0 The input filter selection field allows you to select the filter frequency for each channel and provides system status of the input filter setting for channels 0 through 5 The filter frequency affects the following as explained later in this chapter noise rejection characteristics for module inputs channel step response e channel cut off frequency e effective resolution e module update time Effects of Filter Frequency on Noise Rejection The filter frequency that you choose for a module channel determines the amount of noise rejection for the inputs A lower frequency 50 Hz versus 500 H2 provides better noise rejection and increases effective resolution but also increases channel update time A higher filter frequency provides lower noise rejection but decreases the channel update time and effective resolution When selecting a filter frequency be sure to consider cut off frequency and channel step response to obtain acceptable noise rejection Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency Common Mode Rejection is better than 115 dB at 50 and 60 Hz with the 50 and 60 Hz filters selected respectively or with the 10Hz filter selected The module performs well in the presence of common mode noise as long as the signals applied to the user positive and negative input terminals do not exceed the common mode voltage rating 10V of the module Impr
152. tion 4 23 Figure 4 10 Effective Resolution Versus Input Filter Selection for Type K Thermocouples Using 10 50 and 60 Hz Filters 400 200 0 200 400 600 800 1000 1200 1400 Temperature 500 0 500 1000 1500 2000 2500 Temperature F Publication 1769 UM004A EN P 4 24 Module Data Status and Channel Configuration Figure 4 11 Effective Resolution Versus Input Filter Selection for Type K Thermocouples Using 250 500 and 1k Hz Filters 120 100 2 3 60 20 0 400 200 0 200 400 600 800 1000 1200 1400 Temperature C 200 180 160 140 120 100 80 60 40 20 Effective Resolution F 500 0 500 1000 1500 2000 2500 Temperature F Publication 1769 UM004A EN P Effective Resolution Effective Resolution F Module Data Status and Channel Configuration 4 25 Figure 4 12 Effective Resolution Versus Input Filter Selection for Type N Thermocouples Using 10 50 and 60 Hz Filters 0 8 0 6 0 4 0 2 400 200 0 200 400 600 800 1000 1200 1400 Temperature C 2 0 1 8 1 6 1 4 1 2 1 0 0 8 0 6 0 4 0 2 400 0 400 800 1200 1600 2000 2400 Temperature Publication 1769 UM004A EN P 4 26 Module Data Status and Channel Configuration 100 90 80 70 60 50 40 30 20 10 0 Effective Resolution Figure 4 13 Effective Resolution Versus Input Filter Selection for Type N Thermocouples Using 250 500 and 1k Hz Filters
153. uration Word Word 2 Word 3 Channel 4 Configuration Word Word 4 Channel 5 Configuration Word Word 5 Module Configuration Word Word 6 Bit 0 Not all controllers support program access to the configuration file Refer to your controller s user manual Publication 1769 UM004A EN P 4 2 Data Status and Channel Configuration Accessing Input Image The input image file represents data words and status words Input words File Data 0 through 5 hold the input data that represents the value of the analog inputs for channels 0 through 5 These data words are valid only when the channel is enabled and there are no errors Input words 6 and 7 hold the status bits To receive valid status information the channel must be enabled You can access the information in the input image file using the programming software configuration screen For information on configuring the module in a MicroLogix 1500 system using RSLogix 500 see Appendix E for CompactLogix using RSLogix 5000 see Appendix F for 1769 ADN DeviceNet Adapter using RSNetworx see Appendix G Input Data File The input data table allows you to access module read data for use in the control program via word and bit access The data table structure is shown in table below Table 4 1 Input Data Table 0 Analog Input Data Channel 0 1 Analog Input Data Channel 1 2 Analog Input Data Channel 2 3 Analog Input Data Channel 3 4 Analog
154. us service of protected type T thermocouples is set at 370 C for AWG 14 1 63 mm thermoelements since type TP thermoelements oxidize rapidly above this temperature However the thermoelectric properties of type TP thermoelements are apparently not grossly affected by oxidation since negligible changes in the thermoelectric voltage were observed at NBS 10 for AWG 12 18 and 22 type TP thermoelements during 30 hours of heating in air at 500 C At this temperature the type TN thermoelements have good resistance to oxidation and exhibit only small voltage changes heated in air for long periods of time as shown by the studies of Dahl 11 Higher operating temperatures up to at least 800 C are possible in inert atmospheres where the deterioration of the type TP thermoelement is no longer a problem The use of type T thermocouples in hydrogen atmospheres at temperatures above about 370 C is not recommended since type TP thermoelements may become brittle Type T thermocouples are not well suited for use in nuclear environments since both thermoelements are subject to significant changes in composition under thermal neutron irradiation The copper in the thermoelements is converted to nickel and zinc Because of the high thermal conductivity of type TP thermoelements special care should be exercised when using the thermocouples to ensure that the measuring and reference junctions assume the desired temperatures ASTM Standard E230 87 in the 1992
155. using frequent or rapid temperature cycling For this type of thermocouple junction the response time is longer than for the grounded junction Using an Exposed Junction Thermocouple Using Thermocouple Junctions D 3 Measuring Junction Isolated from Sheath CL An exposed junction thermocouple uses a measuring junction that does not have a protective metal sheath A thermocouple with this junction type provides the fastest response time but leaves thermocouple wires unprotected against corrosive or mechanical damage Measuring Junction with No Sheath EN As shown in the next illustration using an exposed junction thermocouple can result in removal of channel to channel isolation Isolation is removed if multiple exposed thermocouples are in direct contact with electrically conductive process material 1769 IT6 Conductive Material Multiplexer Publication 1769 UM004A EN P D 4 Using Thermocouple Junctions To prevent violation of channel to channel isolation e For multiple exposed junction thermocouples do not allow the measuring junctions to make direct contact with electrically conductive process material e Preferably use a single exposed junction thermocouple with multiple ungrounded junction thermocouples e Consider using all ungrounded junction thermocouples instead of the exposed junction type Publication 1769 UM004A EN P E Module Configuration Us
156. ustry Vol 3 Herzfeld C M ed New York Reinhold Publishing Corp 1962 Part 2 pp 135 156 43 Starr C D Wang T P A new stable nickel base thermocouple Journal of Testing and Evaluation 4 1 42 56 1976 44 Burley N A Powell R L Burns G W Scroger M The nicrosil versus nisil thermocouple properties and thermoelectric reference data Natl Bur Stand U S Monogr 161 1978 April 167p 45 Burley N A Jones T P Practical performance of nicrosil nisil thermocouples Temperature Measurement 1975 Billing B F Quinn T J ed London and Bristol Institute of Physics 1975 172 180 Publication 1769 UM004A EN P 20 Thermocouple Descriptions Publication 1769 UM004A EN P 46 Burley N A Hess R M Howie Nicrosil and nisil new nickel based thermocouple alloys of ultra high thermoelectric stability High Temperatures High Pressures 12 403 410 1980 47 Burley N A Cocking J L Burns G W Scroger M G The nicrosil versus nisil thermocouple the influence of magnesium on the thermoelectric stability and oxidation resistance of the alloys Temperature Its Measurement and Control in Science and Industry Vol 5 Schooley J ed New York American Institute of Physics 1982 1129 1145 48 Wang T P Starr C D Nicrosil nisil thermocouples in production furnaces in the 538 C 1000 F to 1177 C 2150 F range ISA Transactions 18 4 83 99 19
157. ype thermocouples were not standard interpolating instruments on the IPTS 68 for the 630 74 C to gold freezing point range Other than these two points and remarks regarding history and composition all of the precautions and restrictions on usage given in the section on type S thermocouples also apply to type R thermocouples Glawe and Szaniszlo 24 and Walker et al 25 26 have determined the effects that prolonged exposure at elevated temperatures gt 1200 C in vacuum air and argon atmospheres have on the thermoelectric voltages of type R thermocouples ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that the initial calibration tolerances for type R commercial thermocouples be 1 5 or 0 25 percent whichever is greater between 0 C and 1450 C R thermocouples can be supplied to meet special tolerances of 0 6 C or 0 1 percent whichever is greater The suggested upper temperature limit 1480 C given in the ASTM standard 7 for protected type R thermocouples applies to AWG 24 0 51 mm wire This temperature limit applies to thermocouples used in conventional closed end protecting tubes and it is intended only as a rough guide to the user It does not apply to thermocouples having compacted mineral oxide insulation This section describes Platinum 10 percent Rhodium Alloy Versus Platinum thermocouples commonly known as type S thermocouples This type is often referred to by the n
158. ype E thermocouples which are the most suitable of the letter designated thermocouples types for measurements down to 20K Nevertheless types NP and NN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures Thermocouple Descriptions C 9 Type N thermocouples are best suited for use in oxidizing or inert atmospheres Their suggested upper temperature limit when used in conventional closed end protecting tubes is set at 1260 C by the ASTM 7 for 3 25 mm diameter thermoelements Their maximum upper temperature limit is defined by the melting temperature of the thermoelements which are nominally 1410 C for type NP and 1340 C for type NN 5 The thermoelectric stability and physical life of type N thermocouples when used in air at elevated temperatures will depend upon factors such as the temperature the time at temperature the diameter of the thermoelements and the conditions of use Their thermoelectric stability and oxidation resistance in air have been investigated and compared with those of type K thermocouples by Burley 16 by Burley and others 13 44 47 by Wang and Starr 17 43 48 49 by McLaren and Murdock 33 by Bentley 19 and by Hess 50 Type N thermocouples in general are subject to the same environmental restrictions as types E and K They are not recommended for use at high temperatures in sulfurous reducing or alternately oxidizing a

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