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1. 059 69 6969 69 59 60 59 1 1769 IF8U Item Description 1 bus lever 2a upper panel mounting tab 2b lower panel mounting tab 3 module status LED 4 module door with terminal identification label 5a movable bus connector bus interface with female pins 5b stationary bus connector bus interface with male pins 6 nameplate label Ta upper tongue and groove slots 7b lower tongue and groove slots 8a upper DIN rail latch 4 Compact 10 Universal Input module System Overview 8b lower DIN rail latch 9 write on label for user identification tags 10 removable terminal block RTB with finger safe cover 10a RTB upper retaining screw 100 RTB lower retaining screw 1 CJC sensor 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 in Chapter 5 Diagnostics and Troubleshooting 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 th
2. 86 References IIIS 88 Appendix D Using Thermocouple Junctions 95 Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 101 Appendix F Configuring Your 1769sc IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 107 Table of Contents vii Using a Grounded Junction Thermocouple 2 2 95 Using an Ungrounded Isolated Junction Thermocouple 97 Using an Exposed Junction Thermocouple een 97 Module 0 101 Configuring the 1769sc IFSU MicroLogix 1500 0 etie ert ste aee tc 103 Configuring UO Modules ceret recenseo eco poene 111 Configuring 1769sc IF8U Universal Module Ne 112 Declaration of Conformity 115 viii Compact IO Universal Input Module Who Should Use This Manual How to Use This Manual Related Documentation Preface Read this preface to familiarize yourself with the rest of the manual This preface covers the following topics who should use this manual how to use this manual related publications 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 M O and or compatible controllers such as MicroLogix 1500 or Compact
3. Configuration 8 channels of thermocouple voltage current 0 channels of RTD Resistance inputs 6 channels of thermocouple voltage current 1 channels of RTD Resistance inputs 4 channels of thermocouple voltage current 2 channels of RTD Resistance inputs 2 channels of thermocouple voltage current 3 channels of RTD Resistance inputs 0 channels of thermocouple voltage current 4 channels of RTD Resistance inputs Analog Multiplexed into one ADC Input Modes Temperature voltage current RTD resistance Input Types Thermocouple types J T E S B Nand C Voltage types 50 mV 100 mV 0 5 V 1 5 V 0 10 V and 10 V Current types 0 20 mA 4 20 mA RTD types Pt 385 Pt 3916 Ni 618 Ni 672 Cu 427 Resistance types 0 150 ohms 0 1000 ohms 0 3000 ohms Fault detection Open circuit detection over range and under range error bits Open circuit detection time is equal to the channel update time CMRR 115 dB minimum at 50 Hz 115 dB minimum at 60 Hz NMRR 85 dB minimum at 50 Hz 85 dB minimum at 60 Hz Input Impedance lt 10M ohms for voltage thermocouple RTD resistance inputs 250 ohms for current inputs Common Mode Voltage 10V Calibrated Accuracy Linearization per ITS 90 Thermocouple Inputs System accuracy at 25 10 50 and 60 Hz filters Type J 0 6 degrees C 210 to 200 C 1 2 degrees C
4. ATTENTION 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 IMPORTANT A 1769 ECR or 1769 ECL right or left end cap respectively must be used to terminate the end of the bus 22 Compact IO Universal Input module Mounting 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 below Side Host Controller Module O Module O Module Module Panel Mounting Mount the module to a panel using two screws per module Use M4 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 in Refer to controller documentation 35 28 5 for this dimension 1 12 4 T T E 2 828 5 197 5 3 E 9 5 z gt 1226410
5. 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 0 to 60 Autocalibration occurs automatically on a system mode change from Program to Run for all configured channels or if any online 1 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 1 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 Chapter 4 Module Data Status and Configuration 53 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 offset 0 of a channel calibration adds 73 ms and the second part gain span adds 101 ms to the module update This takes place over two consecutive module scans Each enabled channel requires a separate offset 0 and
6. G Nicrosil nisil high performance thermocouple alloys ZSA 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 1 100 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 Appendix C Thermocouple Descriptions 93 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 Anovel advanced type N integrally sheathed thermocouple of ultra high thermoelectric stability Thermal and 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
7. Module Memory 10 eine eese biete ee te eee eb 33 Accessing Input Image File Data eene 34 Input Data 34 Module 6 36 Determining Effective Resolution and Range 50 Determining Module Update 52 safety Considerations EUER REED 57 Module Operation vs Channel Operation eee 58 Power up Diagnosucs emet ete ener toI awe 58 Channel Dia SOS HOS eripias eter tp recette n des 59 Non critical vs Critical Module Errors eene 60 Module Error Definition Table iscriere apane 61 WO 02 Module Inhibit EUBCIOS cett Et epe Re cte REDE ene et 63 Electrical Specifications iP dli 65 Environmental Conditions iei eee eie deret nee tree E 68 Regulatory 00 C C 68 Positive Decimal 69 Negative Decimal VAISS tet p EU ROO exiret 70 International Temperature Scale of 1990 sese 73 Type B Therno ouples c icono me epi den 73 Type E TDhernmocoupleS aie 75 Type J Thermocouples sessir ipe P ERR RES 77 Type K 0 78 Type IN 80 Type 00 amp Type S Thermocouples ceto dore piter irme ORE 83 T Thermocouples tii eee rire
8. 200 C to 1300 C 1 degrees C T 270 to 230 C 5 4 degrees C 230 C to 400 C 1 degrees C 270 to 225 C 7 5 degrees C 225 C to 1370 C 1 degrees C E 270 to 210 C 4 2 degrees C 210 C to 1000 C 0 5 degrees C 1 8 degrees C Type B 3 0 degrees C Type S and R 1 7 degrees C System accuracy at 0 60 C 10 50 and 60 Hz filters 0 9 degrees C 210 C to 200 C 1 8 degrees C 200 C to 1300 C 1 5 degrees C 270 C to 230 C 7 0 degrees C 230 C to 400 C 1 5 degrees C 270 C to 225 C 10 degrees C 225 C to 1370 C 1 5 degrees C 270 C to 210 C 6 3 degrees C 210 C to 1000 C 0 8 degrees C 3 5 degrees C B 4 5 degrees C Type S and R 2 6 degrees C 2 CJC accuracy 3 0 degrees C maximum CJC Sensor accuracy 0 1 degrees C maximum 66 Compact IO Universal Input Module Voltage Inputs System accuracy at 25 10 50 and 60 Hz filters 15 uV maximum for 50 mV inputs 25 for 10 Hz 50 Hz and 60 Hz filters 20 uV maximum for 100 mV inputs 25 for 10 Hz 50 Hz and 60 Hz filters 2 5 mV maximum for 0 5V inputs 25 for 10 Hz 50 Hz and 60 Hz filters 2 mV maximum for 1 5V inputs 25 for 10 Hz 50 Hz and 60 Hz filters 5
9. 2 8192 8192 1x212 4096 4096 1x2 2048 2048 1x21 1024 1024 1x29 512 512 1x28 256 256 1x27 128 128 1x28 64 64 1x25 232 32 1x24 16 16 1x23 8 8 1x2 4 4 1x21 22 2 1x20 1 1 0x215 0 This position is always 0 for positive numbers 70 Compact IO Universal Input Modules Negative Decimal Values two s complement notation the far left position is always 1 for negative values The equivalent decimal value of the binary number is obtained by subtracting the value ofthe far left position 32768 from the sum ofthe values ofthe other positions In the figure below all positions are 1 the value is 32767 32768 1 For example 1111 1000 0010 0011 2 4 213 212 21 25 21 20 25 16384 8192 4096 2048 32 2 1 32768 30755 32768 2013 1x2 16384 16384 1x21 8192 8192 1x21 4096 4096 1x211 2048 2048 1x210 1024 1024 1 29 512 512 1 28 256 256 1x2 128 128 1 26 64 64 1x25 232 32 1x24 16 16 1x23 8 8 1x2 4 4 2 2 1 20 1 1 1 215 232768 This position is always 1 for negative numbers Appendix B Two s Complement Binary Numbers 71 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 Monograp
10. E C Data Files cross Reference E oo output input s2 status BINARY 14 Timer cs counter 3 Rs CONTROL N7 INTEGER Fa FLOAT Natal For Help press F1 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 104 Compact IO Universal Input Module 1 0 Configuration m Current Cards Available Filter ID Pat Description 4 Read IO Config 1769 1016 16 Input 10 30 VDC 1769 IQ6XOW4 6 Input 24 VDC 4 Output RLY 17684R5 6 Channel RTD Module 1769 IT6 B Channel Thermocouple Module 1769 048 8 Output 120 240 VAC 16 Output 120 240 VAC 16 Dutput 24 VDC Source 16 Output 24 VDC Source w Protectior Analog 2 Channel Output Module 16 Output 24 VDC Sink 8 Output Relay 16 Output Relay 8 Output Isolated Relay DeviceNetScanner Power Supply Power Supply Power Supply Power Supply Any 1769 PowerSupply Any 1769 UnPowered Cable Help Hide All Cards Other Requires 1 0 Card Type ID 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 A communications dialog appears identifying the current communications configuration so that you can verif
11. Temperature Its Measurement and Control in Science and Industry Vol 6 Schooley J F 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 11009 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 J Phys E Sci Instrum 20 1368 1373 1987 62 Bentley R E Thermoelectric hysteresis in nickel based thermocouple alloys J Phys D 22 1902 1907 1989 Publication 1769 UM004A EN P 94 Compact IO Universal Input Module Using a Grounded Junction Thermocouple Appendix D Using Thermocouple Junctions This appendix describes the types of thermocouple junctions available and explains the trade offs in using them with the 1769 I
12. 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 oftype S 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 Appendix C Thermocouple Descriptions 85 contamination usually causes negative changes 25 26 29 in the thermoelectric voltage ofthe 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 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 be virtually eliminated at 1700 C by using a single length of twin bore tubing to insulate the thermoelements and that contamination of the thermocouple by impurities transferred from th
13. data words where configuration data may be entered for the 1769sc IF8U module The tag addresses for these 18 words are Local 1 C Data 0 through Local 1 C Data 17 The first two configuration words are used to configure module functions like CJC enable cyclic calibration open circuit detection and temperature units i e Celcious Fahrenheit Words 2 through 9 are used to configure channels 0 through 7 respectively All 8 words configure the same parameters for the 8 different channels For a complete description of each of these parameters and the choices available for each of them see Configuration Data File in chapter 4 Appendix F Configuring Your 1769sc IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 113 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 1769sc IF8U module input data is located in the following tag addresses when the controller is in Run mode 1769s c IF8U Channel Tag Address 0 onl co 7 w here 1 represents the slot number of the 1769sc IF8U module Local 1 Data 0 Local 1 Data 1 Local 1 Data 2 Local 1 Data 3 Local 1 Data 4 Local 1 Data 5 Local 1 Data 6 Local 1 Data 7 114 Compact IO Universal Input Module Get
14. 0 to 20mA 4mA to 20mA The data can be configured on board each module as engineering units x 1 engineering units x 10 scaled for PID percent of full scale raw proportional data 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 10 Hz 50 Hz 60 Hz 250 Hz 500 Hz 1000 Hz Chapter 1 Module Overview 3 Hardware Features The module contains a removable terminal block Channels are wired as differential inputs with the exception of RTD and resistance type inputs One cold junction compensation CJC sensor can be added to the terminal block to enable accurate readings when using thermocouple input types The CJC sensor compensates for offset voltages introduced into the input signal as a result ofthe cold junction where the thermocouple wires are connected to the module Module configuration is done via the controller s programming software and hardware jumper settings In addition some controllers support configuration via the user program In either case the module configuration is stored in the memory ofthe controller Refer to your controller s user manual for more information The illustration below shows the module s hardware features
15. 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 24 Compact IO Universal Input module Replacing a Single Module within a System The module can be replaced while the system is mounted to a panel or DIN rail Follow these steps in order 1 2 Remove power See important note at the beginning of this chapter 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 Move the bus lever to the right to disconnect unlock the bus 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 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 NOTE 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 6 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 Slide the replacement module into the open sl
16. 76A 3 263 283 1972 May June 13 Burley N Hess M Howie C F Coleman J The nicrosil versus nisil thermocouple critical comparison with the ANSI standard Appendix C Thermocouple Descriptions 89 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 14 Potts J F Jr McElroy D L 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 R G 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 H ed Pittsburgh Instrument Society of America 1972 1677 1695 17 Wang T P Starr C D Electromotive force stability of nicrosil 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 Testi
17. Autocalibration of a channel occurs whenever a channel is enabled You can also program your module to perform cyclic calibration cycles every five minutes See Selecting Enable Disable Cyclic Calibration Word 0 Bit 14 in chapter 4 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 32 Compact IO Universal Input module Chapter 4 Module Data Status and Configuration 33 Module Map Memory Chapter 4 Module Data Status and Channel Configuration After installing the 1769 IF8u universal 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 module memory map accessing input image file data configuring channels determining effective resolution and range determining module update time The module uses eleven input words for data and status bits input image and eighteen configuration words Memory Map Channel 0 Data Word Channel 1 Data Word Channel 2
18. C than those sheathed in stainless steel Bentley and Morgan 52 stressed the importance of using Inconel sheathing with a very low 82 Compact IO Universal Input Module Type R Thermocouples 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 ofa type N thermocouple is extremely sensitive to minor differences in heat treatment provided that the treatment does not violate any ofthe 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 guidelines and details ASTM Standard E230 87 in the 1992 Annual Book of ASTM Standards 7 specifies that
19. Ni 672 2 2 1 23 27 604 NiFe 518 150 ohm 5 5 2 20 107 1372 1000 ohm 1 2 1 7 39 102 3000 ohm 1 0 0 10 21 68 Note A 1000 samples were taken to find the deviations listed above Chapter 4 Module Data Status and Configuration 51 Table 4 6b Effective Resolution In units vs Input Filter Selection Units V A degC Ohms 60Hz 50Hz 10Hz 250Hz 500Hz 1000 2 0 000049 0 000082 10V to 10V 0 000000 0 000000 0 000000 0 000915 0 001830 0 014640 Oto10V 0 000153 0 000000 0 000153 0 000306 0 002448 0 014688 1to5V 0 000061 0 000061 0 000000 0 000183 0 001281 0 004880 Oto5V 0 000076 0 000076 0 000000 0 000382 0 001221 0 0 000488 0 000093 4 493500 19 101100 20 767200 Type E TC 0 155200 0 155200 0 097000 0 659600 2 386200 12 125000 Type R TC 0 378000 0 486000 0 297000 3 240000 9 855000 0 Type S TC 0 459000 0 432000 0 162000 3 024000 10 287000 25 056000 Type B TC 0 719200 0 649600 0 394400 4 060000 18 676000 37 885600 7 337000 12 037300 6 528000 1 488000 8 224000 1000 Pt 385 0 016000 0 016000 0 000000 0 048000 0 160000 5 312000 100 Pt 3916 0 038100 0 025400 0 012700 0 330200 0 266700 8 686800 200 Pt 3916 0 012700 0 025400 0 012700 0 152400 0 254000 1 981200 500 Pt 3916 0 012700 0 012700 0 000000 0 076200 1 054100 0 0 800100 9 042030 2 843820 1 354590 604 NiF
20. be in accordance with Class 1 Division 2 wiring methods Article 501 4 b ofthe National Electric Code NFPA 70 and in accordance with the authority having jurisdiction Channels are isolated from one another by 10 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 If field wiring must cross ac or power cables ensure that they cross at right angles If multiple power supplies are used with analog millivolt inputs the power supply commons must be connected Terminal Block Do not remove the CJC sensor from the terminal block if thermocouples are to be utilized Removal ofthe sensor will reduce accuracy Note For improved accuracy use a remote terminal block configuration when possible See chapter 3 for more details For millivolt and current sensors use Belden 8761 shielded twisted pair wire or equivalent to ensure proper operation and high immunity to electrical noise For RTD and resistance sensors use Belden 9501 2 wire 9533 3 wire and 83503 for runs over 100 feet or equivalent For a thermocouple use the shielded twisted pair thermocouple extension lead wires specified by the thermocouple manufacturer Using the
21. between 0 C and 350 C and 1 or 51 5 percent whichever is greater between 2009 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 C However the same materials may not satisfy the tolerances specified for the 2009 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 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 88 Compact IO Universal Input Module References 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 1 Preston Thomas H The International Temperature Scale of 1990 ITS 90 Metrologia 27 3 10 1990 ibid p 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 Tempe
22. owner s guide 1s subject to change without notice LimitedWarranty Spectrum Controls warrants that its products are free from defects in material and workmanship under normal use and service as described in Spectrum Controls literature covering this product for a period of 1 year The obligations of Spectrum Controls under this warranty are limited to replacing or repairing at its option at its factory or facility any product which shall in the applicable period after shipment be returned to the Spectrum Controls facility transportation charges prepaid and which after examination is determined to the satisfaction of Spectrum Controls to be thus defective This warranty shall not apply to any such equipment which shall have been repaired or altered except by Spectrum Controls or which shall have been subject to misuse neglect or accident In no case shall the liability of Spectrum Controls exceed the purchase price The aforementioned provisions do not extend the original warranty period of any product which has either been repaired or replaced by Spectrum Controls Preface ix Chapter 1 Module Overview 1 Chapter 2 Quick Start for Experienced Users 9 Chapter 3 Installation and Wiring 17 Table of Contents Who Should Use This Mantal M MH How to Use Thus Related Documentation onere cer cm rrt r
23. percent nickel 1 to 1 5 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 4mV K being roughly one half that of the type E thermocouple which is the most suitable ofthe 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 oftype 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 even so type K t
24. the initial calibration tolerances for type N commercial thermocouples be 2 2 C or 50 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 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 15 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 percent shall be alloyed with platinum of 99 99 percent purity to produce the positive thermoelement which
25. 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 Appendix C Thermocouple Descriptions 83 Type S Thermocouples 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 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 5 thermocouples over much of the range Type R thermocouples were not standard interpolating instruments on the IPTS 68 for the 63
26. user may choose to forgo calibration and its resulting better accuracy over time in favor of better throughput CJC Sensor If enabled default the CJC is read once every other module scan and its value updated in the CJC status word This value is also used for thermocouple cold junction compensation If disabled the CJC sensor value is not acquired and the CJC temperature is fixed at 25 C for all channels The CJC will also be fixed at 25 C for all channels if it is determined to be broken short or open circuit Configuration Word 1 15 14 13 112 11 10 9 8 7 6 5 4 3 2 1 Open Circuit Disable Ch7 Ch6 Ch5 4 Ch3 Ch2 Ch1 ChO 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Perform CJC 0 Volt CJC Adjust CH7 CH6 CH5 CH4 CH3 CH2 CH1 CHO 0 0 0 0 0 0 0 0 No CJC Adjustment 1 1 1 1 1 1 1 1 Open Circuit Disable Setting the bit to 1 disables the open circuit detect for the associated channel By default open circuit detection is applied 0 Volt CJC Adjust Cold Junction Compensation CJC is performed by default by taking the CJC sensor temperature value for a given channel converting that to a thermocouple voltage and adding that voltage from the measured value prior to converting to a user value 40 Compact IO Universal Input module Ifthis bit is set for a given channel the signal value is directly converted to a user value No cold junction compensation perf
27. 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 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 and reducing atmospheres unless suitably protected w
28. word is out of the defined operating range an over range or under range error is indicated in input data word 9 Possible causes of an out of range condition include Thetemperature is too hot or too cold for the type of thermocouple or RTD being used The wrong thermocouple or RTD is being used for the input type selected or for the configuration that was programmed Theinput device is faulty The signal input from the input device is beyond the scaling range 60 Compact IO Universal Input module Non critical vs Critical Module Errors Open Circuit Detection On every other module 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 8 Possible causes of an open circuit include theinput device is broken awire is loose or cut e the input device is not installed on the configured channel Athermocouple or RTD is installed incorrectly Attention When using a 4 wire RTD an open circuit condition is detected only if the excitation or the return are broken Attention Open circuit detection is not applicable to the 10 Volt range Non critical module errors are typically recoverable Channel errors over range or under range errors are non critical Non critical error conditions are indicated in the module input data table Critical module errors are
29. 0 74 C to gold freezing point range Other than these two points and remarks regarding history and composition all ofthe 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 71200 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 C or 0 25 percent whichever is greater between 0 C and 1450 C Type R thermocouples can be supplied to meet special tolerances of 0 6 C or 50 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 nominal chemical composition of its positive SP thermoelement platinum 10 percent rhodium The
30. 2 o z o z 4 826 0 008 T c Y Note dimensions in mm in Hole spacing tolerance is 0 4 mm 0 016 in Chapter 3 Installation and Wiring 23 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 the previous page 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 modules 4 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 NOTE If mounting more modules mount only the last one 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 35 x 7 5 mm EN 50 022 35 x 7 5 or 35 15 mm EN 50 022 35 x
31. 383 32767 to 32767 010 10000 0 10V 0 to 1000 0 to 10002 0 to 100002 0 to 100002 0 to 16383 32767 to 32767 0 10000 10 V 1000 to 1000 1000 to 10002 10000 to 10000 10000 to 100002 010 16383 32767 to 32767 010 10000 0 20 0 to 20007 0 to 20000 0 to 16383 32767 to 32767 0 to 10000 4 20mA 400to 2000 4000 to 20000 to 16383 32767 to 32767 0 0 0 1500 0 to 1500 0 to 15000 0 to 16383 32767 to 32767 0 to 10000 0 1000 Q 0 to 1000 0 to 1000 0 to 10000 0 to 10000 0 to 16383 32767 to 32767 0 10 10000 0 3000 Q 0 to 3000 0 to 3000 0 to 30000 0 to 30000 0 to 16383 32767 to 32767 0 to 10000 Platinum 385 200to 850 328 to 1562 2000 to 8500 3280 to 15620 0 to 16383 32767 to 32767 0 Platinum 3916 200 to 630 328 to 1166 2000 to 6300 3280 to 11660 0 16383 32767 to 32767 0 10000 Copper 426 100 to 260 1480 to 5000 0 to 16383 32767 to 32767 0 to 10000 Nickel 618 100 to 260 1480 to 5000 0 to 16383 32767 to 32767 0 to 10000 Nickel 672 80 to 260 1120 to 5000 0 to 16383 32767 to 32767 0 to 10000 518 100to200 148to 392 1000to 2000 1480 to 3920 0 to 16383 32767 to 32767 010 10000 1 Type and C thermocouples Nickel 672 Nickel 618 Nickel Iron 518 and Copper 426 cannot be represented in engineering units x 1 F above 3276 7 F or below 3276 7 F for Nicke Iron 518 Software treats it as an over range error or under range error for
32. 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 Appendix C Thermocouple Descriptions 7 4 6 Thermocouples are intended only as a rough guide to the user They do not apply to thermocouples having compacted mineral oxide insulation This section discusses Iron Versus Copper Nickel Alloy SAMA thermocouples called type J thermocouples A type J thermocouple is one ofthe 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 oftype J materials are supplied annually to industry in this country
33. 5 0 8 for Platinum 3916 0 8 for Nickel 0 5 C for Nickel lron 1 1 C for Copper Resistance Inputs System accuracy at 25 C 10 50 and 60 Hz filters 0 15 ohms for 150 ohm range 1 0 ohms for 1000 ohm range 1 5 ohms for 3000 ohm range System accuracy at 0 60 C 10 50 and 60 Hz filters 0 25 ohms for 150 ohm range 1 0 ohms for 1000 ohm range 2 5 ohms for 3000 ohm range Note Accuracy is dependent on the ADC output rate selection data format and input noise Repeatability at 25 C 10 Hz filter Thermocouple Types Jand N Thermocouple Types 0 1 C N 110 C to 1300 C Thermocouple Types 0 25 C N 210 C to 110 C Thermocouple Types 0 1 C T 170 to 400 C Thermocouple Types 1 5 C T 270 C to 170 C Thermocouple Type 0 1 C K 170 C to 1370 C Thermocouple Type 2 0 C K 270 C to 170 C Thermocouple Type 0 1 C E 220 C to 1000 C Thermocouple Type 1 0 C E 270 C to 220 C Thermocouple Types 0 4 SandR Appendix A Specifications 67 Thermocouple Type B 0 7 C Thermocouple Type C 0 2 C Millivolt Inputs 3 UV Voltage Inputs 150 mV Current Inputs 0 3 uA RTD Resistance Platinum 385 Platinum 3916 0 02 0 1 Nickel 0 01
34. 76 7 F The role of the cyclic calibration is to reduce offset and gain drift errors due to temperature changes within the module By setting bit 14 to 0 you Compact IO Universal Input module 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 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 Note 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 see Appendix E for RSLogix 5000 CompactLogix controller see Appendix F The default value of the configuration data 1s represented by zeros in the data file The configuration settings for word 0 are shown below Configuration Word 0 Bit Temp Units EN EN 0 Degrees 0 Degrees F 1 Unused CJC Weighted omis
35. 8 0 Predefined Module Defined 15 9 Yo Configuration 4 1 1769 L35E Ethernet Port LocalENB CompactBus Local 768 L35E Controller Slot o Major Fault Minor Fault 3 Kinbox Microsoft Manual Fa Adobe Pagemaker 7 fif RSLogix 5000 8 1 Micro DS 2 24 PM In the Controller Organizer on the left of the screen right click on 0 CompactBus Local select New Module and the following screen appears Appendix F Configuring Your 1769sc IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 109 Major Revision 1769 MODULE fi 2 Description 12 Point 240 AC Input 18 Point 24V DC Input Sink Source 1769 80 w 474 B Point 24V DC Sink Source Input 4 Point AC DC Relay Output 1769 IQEXOW4 B B Point 24V DC Sink Source Input 4 Point AC DC Relay Output B Channel RTD Direct Resistance Analog Input B Channel Thermocouple mV Analog Input 1769 MODULE Generic 1769 Module 1769 041674 16 Point 100 240 AC Output 1769 04874 8 Point 100 240 AC Output 1769 048 B 8 Point 100 240 AC Output 1769 0B1674 16 Point 24 DC Output Source 1769 0B16 B 16 Point 24v DC Output Source Show Vendor 2 Other v Specialty 1 0 Select Analog Digital Communication v Motion 1 Controller Clear All OK This screen is used to narr
36. C Nickel lron C 0 150 ohm t 5 mQ 0 1000 ohm 15 mQ 0 3000 ohm 50 mQ Temp Coefficient Temperature compensation done by periodic calibration Data formats Eng units Eng units X10 Scaled for PID Prop Counts Percent of Full Scale Input Filter 10 Hz 50 Hz 60 Hz 250 Hz 500 Hz 1kHz Channel Update Time Single Channel Min Voltage Current RTD Resistance input 7 ms with 1 kHz filter no cal Thermocouple input 14 ms with 1 kHz filter no cal Single Channel Max Voltage Current RTD Resistance input 303 ms with 10 Hz filter no cal Thermocouple input 606 ms with 10 Hz filter no cal 8 Channel Min Voltage Current RTD Resistance inputs only 56 ms with 1 kHz filter no cal Thermocouple or mixed inputs 63 ms with 1 kHz filter no cal 8 Channel Max Voltage Current RTD Resistance inputs only 2424 ms with 10 Hz filter no cal Thermocouple or mixed inputs 2727 ms with 10 Hz filter no cal Open Circuit Detection Time 7 ms 2 1 seconds Open circuit detection time is equal to the channel update time Input Over voltage Protection 30 Continuous Input Over Current Protection 28 mA DC Continuous Isolation Channel to Rack 707 VDC for 1 minute Optical amp magnetic Channel to Channel 10V Cable Impedance 25 ohms maximum for specified accuracy Input Protection Voltage Mode 30VD
37. C continuous Max Current input is limited due to input impedance 28mA max Power Requirements Internal rack 5V 150 mA maximum Internal rack 24V 45 mA maximum Fusing None 1 These accuracies were measured without CJC compensation To determine the overall accuracy you must add the CJC accuracy to each thermocouple type For example if you are using a J thermocouple you would need to add 3 degrees C which calculates to 3 6 degrees C overall To improve accuracy use a remote terminal block configuration For more details refer to chapter 2 68 Compact IO Universal Input Module Environmental Conditions Regulatory Compliance Mechanical Vibration Shock Unpack Shock amp Vibration op Free Fall Unpackaged non op Standard IEC 68 2 6 FC ICCG ES 001 A IEC 68 2 32 1 Class Limit Class III Shock Unpackaged op IEC 68 2 27Ea ICCG ES 002 A Class III Cat I Packaging Tests NSTA Temperature 0 to 60 Degree C Temp Cycle op IEC 68 2 14Nb ICCG ES 006 C 0 to 60 2 cycles 5hr cycle Thermal mapping of hot comp Done at 60 deg C full load Storage Temperature High temp non op IEC 68 2 2Bb ICCG ES 006 C 40 to 85 Degree C 85 for 16hrs Low temp non op Temp Cycle non op IEC 68 2 2Ab ICCG ES 006 C IEC 68 2 14Na ICCG ES 006 C 40 for 16hrs 40 to 85 2 cycl
38. Config 102 18 Enter the Assembly Instance numbers and their associated sizes for the 1769sc IF8U module into the Generic Profile When complete the Generic Profile for a 1769sc IF8U module should look like the following Module Properties Local 1 1769 MODULE 1 1 1 xj Type 1769 MODULE Generic 1769 Module Parent Local Connection Parameters Assembly Instance Size Name Input n zl 16 bit Description Output 104 Configuration 102 8 nes Comm Format Input Data INT 7 Slot a Cancel Back Next gt Help At this point you may click Finish to complete the configuration of your T 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 Appendix F Configuring Your 1769sc IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 111 Configuring Once you have created a Generic Profile for 1769sc IF8U Universal module you must enter configuration information into the Tag database thatis 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
39. Data Word Channel 3 Data Word Channel 4 Data Word Channel 5 Data Word Channel 6 Data Word Channel 7 Data Word Valid Input General Open circuit Status Bits Input Image 11 Words Over Under Range Status Bits Rie CJC Status Word soa Configuration slot e gt 18 Words Module Configuration Word 0 Module Configuration Word 1 Channel 0 Configuration Word Configuration File Channel 1 Configuration Word Channel 2 Configuration Word Channel 3 Configuration Word Channel 4 Configuration Word Channel 5 Configuration Word Channel 6 Configuration Word Channel 7 Configuration Word Words 10 through 17 Reserved Bit 15 Bit 1 Words 10 through 17 must be set to zero NOTE Not all controllers support program access to the configuration file Refer to your controller s user manual 34 Compact IO Universal Input module Accessing Input Image File Data Input Data File The input image file represents data words and status words Input words 0 through 7 hold the input data that represents the value ofthe analog inputs for channels 0 through 7 These data words are valid only when the channel is enabled and there are no errors Input words 8 9 and 10 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 programmi
40. F8u thermocouple mV analog input module ATTENTION 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 grounded ungrounded isolated exposed With a grounded junction thermocouple the measuring junction is physically connected to the protective sheath forming a completely sealed integral junction Ifthe sheath is metal or 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 Measuring Junction Metal Sheath Connected to Sheat Extension Wire i The shield input terminals for 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 ofthe 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 96 Compact IOTM Universal Input Module and sheath sheaths are tied together It should be noted that the isolation i
41. However this type is least suitable 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 anyw
42. I O Compact I O Compact I O 1 2 3 4 5 6 7 8 Power Supply Distance Compact I O Compact I O Compact I O System Power Supply Compact I O Compact I O Compact I O Compact I O 5 5 5 E E o 3 2 1 1 2 3 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 or DIN Rail Mounting To work with a system that is already mounted see Replacing a Single Module within a System The following procedure shows you how to assemble the Compact I O system Chapter 3 Installation and Wiring 21 1 Disconnect power 2 Check that the bus lever of the module to be installed 18 in the unlocked fully right position NOTE If the module is being installed to the left of an existing module check that the right side adjacent module s bus lever 18 in the unlocked fully right position 3 Use the upper and lower tongue and groove slots 1 to secure the modules together or 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
43. J Long term drift of some noble and refractory metal thermocouples at 1600K 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 R R 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 Rev Sci Instrum 36 601 606 1965 27 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 Plumb H H ed Pittsburgh Instrument Society of America 1972 1585 1603 28 Burns W Strouse F Mangum B W Croarkin M Guthrie W F Marcarino P Battuello M Lee H 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 Fan K Wu S New reference functions for platinum 10 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 ed
44. Logix 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 1769sc IF8u The table below provides a listing of publications that contain important information about MicroLogix 1500 systems Document Title Document Number MicroLogix 1500 User Manual 1764 UM001A US P 1769 Compact Discrete Input Output Modules Product Data 1769 2 1 MicroLogix 1500 System Overview 1764 S0001B EN P Compact I O System Overview 1769 SO001A EN P CompactLogix User Manual 1769 UM007B EN P Allen Bradley Programmable Controller Grounding and Wiring Guidelines 1770 4 1 If you would like a manual you can download a free electronic version from the internet at www theautomationbookstore com purchase a printed manual by contacting your local distributor or Rockwell Automation representative visiting www theautomationbookstore com and placing your order x Compact I O Universal Input Module calling 1 800 963 9548 USA Canada or 001 330 725 1574 Outside USA Canada Conventions Used in This Manual The following conventions are used throughout this manual Bulleted lists like this one provide information not procedural steps Numbered lists provide sequential steps or hierarchical information Italic type 1s used for emphasis Text in this font indicates words or phrases you should type General Descriptio
45. N a CHO CH4 CH1 CH5 CH2 CH6 CH3 CH7 LL J5 6 J7 J9 J10 J1 J12 Note The module comes from the factory with all the jumpers set for current type inputs Chapter 4 Module Data Status and Configuration 37 Jumper setting for current type input This includes all current type inputs i e 0 to 20 mA and 4 to 20 mA 1 2 3 Jumper setting for non current type input Includes input types such as thermocouples RTDs resistance and all voltage ranges 1 2 3 e AN sentio J4 is only used during factory calibration and should be removed for normal operation of the module Module Configuration Word 0 Module configuration word C e 0 contains the bits to enable or disable cyclic calibration and the CJC sensor for the module It is also used to indicate which temperature mode is preferred for the module when using RTDs or thermocouples Disabling cyclic calibration or the CJC sensor for thermocouple inputs will reduce the total module scan time if performance over accuracy is desired IMPORTANT you are using engineering units x 1 data format and 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 32
46. New York American Institute of Physics 1992 537 546 29 Bentley E Changes in Seebeck coefficient 01 Pt and Pt 10 Rh after use to 1700C in high purity polycrystalline alumina Int J Thermophys 6 1 83 99 1985 30 McLaren E H Murdock E G New considerations on the preparation properties and limitations ofthe standard thermocouple for thermometry Temperature Its Measurement and Control in Science and Industry Vol 4 Plumb H 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 G The properties of Pt PtRh thermocouples for thermometry in the range 0 1100 C II Effect of Appendix C Thermocouple Descriptions 91 heat treatment on standard thermocouples National Research Council of Canada Publication APH 2213 NRCC 17408 1979 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 in Science and Industry Vol 5 Schooley J F 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
47. OTE Default settings for a particular function are indicated by zero s For example the default filter frequency is 60Hz Publication 42 Compact IO Universal Input module Enabling 2 4 Wire RTD Bit 15 Setting bit 15 to a one enables 2 4 wire RTD on the associated channel Note Bits 14 and 15 are used for RTD and resistance modes only They are used to specify 2 3 or 4 wire RTD modes 2 wire RTD mode is implemented when cyclic lead compensation bit14 is disabled and 2 4 wire bit15 is enabled 3 wire RTD and resistance is implemented by enabling cyclic lead compensation and disabling 2 4 wire 4 wire RTD or resistance is implemented by enabling 2 4 wire and disabling cyclic lead compensation Disabling Cyclic Lead Compensation Bit 14 Setting bit 14 to a one disables cyclic lead compensation Note Bits 14 and 15 are used for RTD and resistance modes only They are used to specify 2 3 or 4 wire RTD modes 2 wire RTD mode is implemented when cyclic lead compensation bit14 is disabled and 2 4 wire bit15 is enabled 3 wire RTD and resistance is implemented by enabling cyclic lead compensation and disabling 2 4 wire 4 wire RTD or resistance is implemented by enabling 2 4 wire and disabling cyclic lead compensation Selecting Data Formats Bits 13 through 11 This selection configures channels 0 through 7 to present analog data in any ofthe following formats Engineering Units x 1 Engineering Units x 10 Raw Propo
48. Owner s Guide 0300198 02 Rev C Compact I O UNIVERSAL ANALOG NPUT MODULE Catalog Number 1769sc IF8u RU U 2 0 0 N E 6 T R C L 5 Important Notes 1 Please read all the information in this owner s guide before installing the product 2 The information in this owner s guide applies to hardware Series A and firmware version 1 0 or later 3 This guide assumes that the reader has a full working knowledge of the relevant processor Notice The products and services described in this owner s guide are useful in a wide variety of applications Therefore the user and others responsible for applying the products and services described herein are responsible for determining their acceptability for each application While efforts have been made to provide accurate information within this owner s guide Spectrum Controls assumes no responsibility for the accuracy completeness or usefulness of the information herein Under no circumstances will Spectrum Controls be responsible or liable for any damages or losses including indirect or consequential damages or losses arising out of either the use of any information within this owner s guide or the use of any product or service referenced herein No patent liability is assumed by Spectrum Controls with respect to the use of any of the information products circuits programming or services referenced herein The information in this
49. 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 nst and Control Systems 106 107 March 1972 38 Burns G W Gallagher J S Reference tables for the Pt 30 percent Rh versus Pt 6 percent Rh thermocouple J 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 Industry 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 Bur
50. able 4 2 for details NOTE Use the engineering units x 10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit The resolution of the engineering units x 1 data format is dependent on the range selected and the filter selected See Determining Effective Resolution and Range Engineering Units x 10 When using this data format the module scales the input data to the actual engineering values for the selected input type Values are expressed in whole units i e no assumed decimal place Refer to table 4 2 for more details 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 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 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 exam
51. al hundred hours at 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 ofthe Pt 6 percent rhodium thermoelement which is estimated to be about 18209 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 ofthe thermocouple at high temperatures has been shown by Walker et al 25 26 to depend primarily on the quality ofthe 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 C and 50 C For exa
52. below 3276 7 F for Nickel Iron 518 When voltage or current modes are selected the temperature setting is ignored Analog input data is the same for either or F selection NOTE The engineering units data formats represent real 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 1 thermocouple is selected the lowest temperature of 210 C corresponds to 32767 counts The highest temperature of 1200 C corresponds to 44 Compact IO Universal Input module 132767 See Determining Effective Resolution and Range within this chapter Engineering Units x 1 When using this data format the module scales the input data to the actual engineering values for the selected input type Values are expressed with an assumed decimal place Refer to T
53. cates an input signal that is at the minimum of its normal 36 Compact IO Universal Input module Module Configuration 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 The Under range bit for the CJC sensor 18 contained in word 10 bit 13 Note The CJC temperature can be monitored using bits 0 through 11 in input word 10 See table 4 1 for details After module installation you must configure operation details such as input type data format etc for each channel Configuration data for the module is stored in the controller configuration file which is both readable and writable Jumper Settings The module handles many input types and therfore requires the input path be changed when applicable The module contains jumpers which allow the user to change the input path from current to a non current path on a channel by channel basis The jumpers are labled on the circuit board as J5 through J12 When the jumpers are configured accross pins 2 and 3 a 250 ohm shunt resistance 15 applied to the respective channel which allows for a current type input to be used When the shunt is configured accross pins 1 and 2 the 250 ohm shunt resistance is open which allows for a non current type input to be used Refer to the figures below for proper jumper placement iN Bite HERENE
54. ch 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 1s only about 5 64 V K being roughly two thirds that ofthe 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 Appendix C Thermocouple Descriptions 87 impurities present in these nearly pure materials The high thermal conductivity ofthe 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 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 continuous 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 Ho
55. 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 Chapter 5 Diagnostics and Troubleshooting 61 Module Error Definition Table 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 Table 5 1 Module Error Table Extended Error Information Don t Care Bits Module Error Hex Digit 4 Hex Digit 3 Hex Digit 2 Module Error Field The purpose ofthe 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 information Hardw are 001 General and specific hardware error codes are Errors specified in the extended error informati
56. d compensates for temperature changes at the terminal block cold junction between the thermocouple wire and the input channel See the block diagram below 500V DC Isolation Bouree CJC Input Mercury ASIC 25 MHz 5 inii 18 pin E Sigma Delta ue Terminal RTD OhmVIIITC 9 a ADC Block nputs 8 a o 80c51XA 2 5V Ref processor w LED flash amp SRAM Offset Calibration 5VD 3 3VD 33V 3 Isolated 5VI 24V Power Supply 24 to 15V 5V Reg The module is designed to support up to 4 channels of RTD or resistance and up to 8 channels of voltage current or thermocouple but not concurrently For every channel of RTD or resistance the module consumes 2 possible channels of voltage current or thermocouple inputs This is due to terminal block limitations in a single board module There are five possible channel configuration combinations under this design architecture See table below Configuration Choices for the 1769sc IF8u 8 channels Voltage Current Thermocouple 0 channels RTD Resistance 6 channels Voltage Current Thermocouple 1 channels RTD Resistance 4 channels Voltage Current Thermocouple 2 channels RTD Resistance 2 channels Voltage Current Thermocouple 3 channel
57. e Bad ADC Bad Power Supply Cock Module Specific Bad module configuration Configuration Channel 0 bad filter configuration Error Channel 1 bad filter configuration Channel bad fiter configuration Channel 3 bad fiter configuration Channel 4 bad fiter configuration X409 001 0 0000 1001 Channel 5 bad filter configuration X40A 001 Channel 6 bad filter configuration Channel 7 bad configuration Channel 0 bad data forma Channel data forma Channel 2 bad data forma Channel 3 bad data forma Channel 4 bad data forma Channel 5 bad data forma Channel 6 bad data forma X413 001 0 0001 0011 Channel 7 bad data format Channel 0 and 1 incorrect RTD channel pair configuration Channel 2 and 3 incorrect RTD channel pair configuration Channel 4 and 5 incorrect RTD channel pair configuration Channel 6 and 7 incorrect RTD channel pair configuration Chapter 5 Diagnostics and Troubleshooting 63 Module Inhibit Function Some controllers support the module inhibit function See your controller manual for details Whenever the 1769sc IF8u module is inhibited the module continues to provide information about changes at its inputs to the 1769 CompactBus master for example a CompactLogix controller 64 Compact IO Universal Input module Electrical Specifications 1769sc IF8U Appendix A 1769sc IF8U Specifications This appendix lists the specifications for the 1769sc IF8U Analog Input module Specification Description
58. e 518 0 004580 0 004580 0 000000 0 045800 0 160300 2 889980 150 ohm 0 011400 0 011400 0 004560 0 045600 0 243960 3 128160 1000 ohm 0 015300 0 030600 0 015300 0 107100 0 596700 0 3000 ohm 0 045800 0 000000 0 000000 0 458000 0 961800 3 114400 52 Compact IO Universal Input module Determining Module Update Time 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 Channel update time 1s dependent upon the input filter selection The following table shows the channel update times Table 4 7 Channel Update Filter Frequency Channel Update Time 10 Hz 50 Hz 60 Hz 250 Hz 500 Hz 1 KHz 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 1s done per scan 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 ofthe module update time
59. e 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 09 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 commercial thermocouples be 1 5 C or 0 25 percent whichever is greater between 0 C and 1450 C Type S thermocouples can be supplied to meet special to
60. e module end Contact your sensor manufacturer for additional details 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 Refer to Industrial Automation Wiring and Grounding Guidelines Allen Bradley publication 1770 4 1 for additional information Noise Prevention To limit the pickup of electrical noise keep thermocouple and millivolt signal wires as far as possible from power and load lines 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 Chapter 3 Installation and Wiring 27 Removing and Replacing the Terminal 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 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 retai
61. e 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 input data to a value within the range selected for that channel Each time a channel is read by the input module that data value 15 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 is set in the channel status word The channel status word is described in the Input Data File in chapter 4 Using the module image table the controller reads the two s complement binary converted input 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 Chapter 1 Module Overview 5 Module Operation When the module receives the 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 If thermocouples are being utilized the module continuously samples the CJC sensor an
62. e sensed temperature at that location Channels that are configured for other input types are not affected by CJC open circuit conditions See Open Circuit Detection in chapter 5 for additional details Bits 5 and 4 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 Response Option Definition Upscale Downscale Last State Zero 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 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 Sets the input data value to the last input value prior to the detection of the open circuit Sets the input data value to 0 to force the channel data word to 0 Selecting Input Filter Frequency Bits 3 through 1 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 46 Compact IO Universal Input module channels 0 through 7 The filter frequency affects the following as explained later in this chapter noise rejection characteristics for module inputs cha
63. e trade offs between effective resolution and channel update time Effects of Filter Frequency on Channel Step Response The selected channel filter frequency determines the channel s step response 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 1 filter frequency Chapter 4 Module Data Status and Configuration 47 Table 4 4 Filter Frequency and Step Response Filter Frequency Step Response 10 Hz 300 ms 50 Hz 60 ms 60 Hz 50 ms 250 Hz 12 ms 500 Hz 6 ms 1 KHz 3 ms 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 frequencies 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 15 7 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 All frequency components above the cut off frequ
64. e 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 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 20 Compact IO Universal Input module System Assembly away from sources of electrical noise such as hard contact switches relays and AC motor drives away from modules which generate significant radiated heat such as the 1769 IA16 Refer to the module 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 rating The maximum 1 module rating is 8 which means that a module may not be located more than 8 modules away from the system power supply MicroLogix 1500 Controller with Integrated System Power Supply Q Q 5 5 5 9 o Compact I O Compact I O Compact I O Compact
65. ections for the CJC sensor are shown below 14 Compact IO Universal Input module Step 4 Configure the module Reference Chapter 4 Module Data Status and Channel Configuration Circuit jumpers are located on the module to change the input path from current to voltage 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 in chapter 4 for more information Step 5 Gothrough the startup procedure Reference Chapter 5 Diagnostics and Troubleshooting 1 Apply power to the controller system 2 Download your program which contains the universal 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 distributor or Spectrum Controls for assistance Step 6 Monitor the module status to check if the module is operating correctly Reference Chapter 5 Diagnostics and Troubleshooting 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 fla
66. ed 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 Chapter 5 Diagnostics and Troubleshooting 59 Channel Diagnostics If module status LED is condition On Proper Operation No action required Off Module Fault Cycle power If condition persists replace the module Call your local distributor or Spectrum Controls for assistance Corrective action 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 Detection Whenever a channel configuration word is improperly defined the module reports an error See table 5 3 for a description of module errors Over or Under Range Detection Whenever the data received at the channel
67. el 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 Channel Configuration Words 10 to 17 RESERVED Attention Words 10 through 17 must be set to zero 50 Compact IO Universal Input module Determining Effective Resolution and Range The effective resolution for an input channel depends upon the filter frequency selected for that channel The following tables provide the effective resolution for each of the range selections at the six available frequencies The tables do not include the affects of unfiltered input noise Choose the frequency that most closely matches your requirements Table 4 6a Effective Resolution In counts vs Input Filter Selection Raw Proportional Counts Input Type 60Hz 50Hz 10Hz 250Hz 500Hz 1000Hz 4to20mA 1 2 1 Oto20mA 1 1 1 10V to 10V 0 0 0 Oto10V 1 0 1 15 1 1 Oto5V 1 1 0 100mV to 100mV 1 1 1 50 to 50mV 2 1 1 Type J TC 4 4 2 Type K TC 12 7 6 Type T TC 63 72 Type E TC 8 8 Type R TC 14 18 Type S TC 17 16 6 112 381 928 Type B TC 31 28 Type N TC 5 7 6 6 100 Pt 385 3 2 200 Pt 385 1 0 500 Pt 385 1 0 0 1000 Pt 385 1 1 0 100 Pt 3916 3 2 1 200 Pt 3916 1 2 1 500 Pt 3916 1000 Pt 3916 0 1 0 24 10 Cu 426 50 40 14 149 206 120 Ni 618 2 3 1 30 21 120
68. ency are increasingly attenuated as shown in the graphs on the next page 48 Compact IO Universal Input module Figure 4 1 Frequency Response Graphs 10 Hz Input Filter Frequency 50 Hz Input Filter Frequency 0 Wal a amp 5 e 1 g 100 150 200 250 300 2 62Hz Frequency Hz 13 1 Hz Frequency Hz 60 Hz Input Filter Frequency 250 Hz Input Filter Frequency 5 g 5 c5 750 900 Mg 130 65 5 Hz Frequency Hz 1000 Hz Input Filter Frequency a z amp m co co 90 1000 1500 2000 250 3000 Frequency 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 Chapter 4 Module Data Status and Configuration 49 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 ofthe input signal The update time defines the rate at which an input channel is scanned and its channel data word is updated Enabling or Disabling a Channel Bit 0 You can enable or disable each ofthe 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 chann
69. ersal Input module From Table 4 7 Channel Update Time 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 56 ms 56 ms 56 ms 56 ms 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 56 ms 56 ms 56 ms 56 ms 101 ms 325 ms Channel 0 Scan 3 Module Scan 2 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time 0 Offset Time 56 ms 56 ms 56 ms 56 ms 73 ms 297 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 56 ms 56 ms 56 ms 56 ms 101 ms 325 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 56 ms 56 ms 56 ms 56 ms 73 ms 297 ms CJC Scan 1 Module Scan 5 Ch 0 Update Time Ch 1 Update Time Ch 2 Update Time CJC Update Time Gain Time 56 ms 56 ms 56 ms 56 ms 101 ms 325 ms CJC Scan 2 Module Scan 6 Ch 0 Update T
70. es 5hr cycle Humidity Pressure 5 to 95 RH non cond non op IEC 68 2 30 Db 5 deg 95 24hrs UL 508 CSA Class 1 Div 2 Group A B C D IEC 68 2 30 Db ICCG ES 008 B 5 deg 95 24hrs CE compliance to EN 61010 1 and EN 61131 2 Appendix B 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 20 and ending at the left with 215 Each position can be 0 or 1 in the processor memory A 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 Positive Decimal 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 2 28 23 27 2 2048 256 8 4 2 8 0010 0011 0010 1000 23 2 28 2 23 8192 512 256 32 8 0 1x2 16284 16384 1
71. et Conventions Used in This Marital cnr EE UU np X General Description aiio 1 DER 1 0 2 ET 2 Hardware Features iie ene ie o RT en TR da 3 System ccena pe AR Oo Em DEREN Hee t OD de eds 4 Module 5 Module Field Calibration ices terr rer here n e ds 7 Before You tester rias rt Liebe ev E Eel pt 9 Required Tools and lont c NEE 9 What You Need TODO peresse ec iier rh P eR ERE eer 9 Compliance to European Directives oet Ot I e EDO S 17 Power Requires orco D EHE REO SU REA e EY OM DU res 18 General Considerations Dore ERR DERE UO ETEN R 18 System DT 20 22 Replacing a Single Module watlum a System inen 24 Field Wiring Connections System de 25 Cold Junction COMP ETS AU OM 30 vi Compact IO Universal Input Module Chapter 4 Module Data Status and Channel Configuration 33 Chapter 5 Diagnostics and Troubleshooting 57 Appendix A 1769sc IF8U Specifications 65 Appendix B Two s Complement Binary Numbers 69 Appendix C Thermocouple Descriptions 3
72. for additional information on wiring grounded ungrounded and exposed thermocouple types Chapter 3 Installation and Wiring 29 Wiring Diagrams Grounded Thermocouple Within 10V DC Grounded Thermocouple 2 Wire Current Input 2 Wire V Voltage Input V 4 Wire Current Input 4 Wire RTD 2Wire Resistance 3 Wire RTD 2 Wire RTD 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 10 dc or temperature readings will be inaccurate 30 Compact IO Universal Input module Cold Junction Compensation To obtain accurate readings from channels configured for thermocouple the cold junction temperature temperature at the module s terminal junction between the thermocouple wire and the input channel must be compensated One cold junction compensating thermistor has been integrated into the removable terminal block This thermistor must remain installed to retain accuracy If the thermistor assembly is accidentally removed re install it by connecting it across the CJC terminals Note Thermocouple accuracy can differ between channels on the terminal block Channels that are physically located further from the CJC sensor are more likely to exhibit a te
73. g a channel error Chapter 2 Quick Start for Experienced Users 15 Compact IO Universal Input module Compliance to European Union Directives Chapter 3 Installation and Wiring This chapter tells you how to determine the power requirements for the module avoid electrostatic damage install the module wire the module s terminal block 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 1769sc IF8u module is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment 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 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 Industrial Automation Wiring and Grounding Guidelines for Noise Immunity publication 1770 4 1 Automa
74. g configured and the amount of configuration data downloaded by the controller NOTE Ifthe new configuration is invalid the bit function remains reset 0 and the module posts a configuration error See Configuration Errors in chapter 5 3 If A D hardware errors prevent the conversion process from taking place the bit condition is set 1 Open Circuit Flag Bits to Bits through of word 8 contain open circuit error information for channels 0 through 7 respectively Errors for the CJC sensor are indicated by OC8 of word 10 The bit is set 1 when an open circuit condition exists Note Open circuit detection is applied once every module scan if enabled See Open Circuit Detection in chapter 5 for more information on open circuit operation Over Range Flag Bits O0 to O7 Over range bits for channels 0 through 7 are contained in word 9 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 The Over range bit for the CJC sensor is contained in word 10 bit 14 Under Range Flag Bits U0 U7 Under range bits for channels 0 through 7 are contained in word 9 odd numbered bits They apply to all input types When set 1 the under range flag bit indi
75. gain span cycle unless channel to be scanned uses an Input Type of the same Input Class as any previously calibrated channel In that case offset and gain calibration values from the previous channel are used and no additional time is required 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 Module Update Time Ch 0 Update Time Ch 1 Update Time 56 ms 12 ms 68 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 Module Update Time Ch 0 Update Time Ch 1 Update Time Ch2 Update Time CJC Update Time uses lowest thermocouple filter selected 305 ms 56 ms 18 ms 305 ms 684 ms 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 Thermocouple with 60 Hz Filter Channel 2 Input Type J Thermocouple with 60 Hz Filter 54 Compact IO Univ
76. gnated thermocouples For 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 15 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 76 Compact IO Universal Input Module 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 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 The effect is most seri
77. h 175 is provided by the United States Department of Commerce 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 K 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 o
78. he results ofthis 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 S 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 type S thermocouples at high temperatures gt 1200 C depends primarily upon the quality ofthe materials used for protection and insulation and has
79. here from 45 to 60 percent copper 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 C 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 ofthe thermocouple with time Because iron 78 Compact IO Universal Input Module Type K Thermocouples 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 increase in manganese content The negative therm
80. hermocouple with this junction type provides the fastest response time but leaves thermocouple wires unprotected against corrosive or mechanical damage Measuring Junction with No Sheat 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 98 Compact IOTM Universal Input Module 1769 IF8u Conductive Material Multiplexers Exposed Junction with Shielded Cable To prevent violation of channel to channel isolation For multiple exposed junction thermocouples do not allow the measuring junctions to make direct contact with electrically conductive process material Preferably use a single exposed junction thermocouple with multiple ungrounded junction thermocouples Consider using all ungrounded junction thermocouples instead of the exposed junction type Appendix D Using Thermocouple Junctions 99 100 Compact IOTM Universal Input Module Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 This appendix examines the 1769sc IF8U 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 l
81. hermocouples 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 ofthe 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 ofthe 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 80 Compact IO Universal Input Module Type N Thermocouples Both thermoelements of type K thermocouples are reasonably stable thermoelectrically under neutron irradiati
82. i Enabled Disabled CJC Dis play Disabled Enabled Cyclic Calibration Enabled Disabled CJC Sensor Enabled Disabled Temp Units This is applied to the appropriate channel as indicated only if the format selected is Engineering Units X1 or X10 The CJC is only displayed in Engineering units for 0 through 25 C 0 850 C or 0 1850 F CJC Weighted Profile There is only one CJC sensor If enabled default the CJC temperature for each channel is scaled by multiplying the single CJC reading by a Chapter 4 Module Data Status and Configuration 39 Bit Enabled Disabled predefined scale factor derived from lab measurements of each terminal block pin s stable temperature If disabled the single CJC reading is applied directly to all channels If the CJC sensors are installed in a remote terminal block the weighted profile must be disabled CJC Display If enabled default is disabled all channel data 1s overridden with that channel s CJC temperature If disabled channel data is presented in the input table as normal Cyclic Calibration If enabled default the module s internal calibration for the ADC 18 run once every 5 minutes If disabled it is executed only once at power on reset and not again Enabling this will allow the module to readjust for environmental changes such as variations in temperature However the module throughput is reduced somewhat during the calibration operation The
83. ick Start for Experienced Users 11 ATTENTION Remove power before removing or inserting this module If you remove or insert a module with power applied an electrical arc may occur 1 Check that the bus lever of the module to be installed is in the unlocked fully right position 2 Use the upper and lower tongue and groove slots 1 to secure the modules together or to a controller 3 Move the module back along the tongue and groove slots until the bus connectors 2 line up with each other 4 Push the bus lever back slightly to clear the positioning tab 3 Use your fingers or a small screwdriver 5 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 6 Attach an end cap terminator 5 to the last module in the system by using the tongue and groove slots as before 7 Lock the end cap bus terminator 6 ATTENTION When attaching modules it is very important that the bus connectors are securely locked together to ensure proper electrical connection IMPORTANT A 1769 ECR or 1769 ECL right or left end cap respectively must be used to terminate the end of the 1769 communication bus Compact IO Universal Input module Step 3 Wire the module Reference Chapter 3 Installation and Wiring Follow the guidelines below when wiring the module General Power and input wiring must
84. ime Ch 1 Update Time Ch 2 Update Time CJC Update Time CJC Offset Time 56 ms 56 ms 56 ms 56 ms 73 ms 297 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 Chapter 4 Module Data Status and Configuration 55 Impact of Autocalibration on Module Startup During Mode Change Regardless ofthe selection ofthe 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 15 not updated by the module and the General Status bits SO to S7 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 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 Data Acquisition Ch 0 Data Acquisition Ch 1 Data Acquisition 101 ms 73 ms 101 ms 73 ms 101 ms 73 ms 56 m
85. incorrect type of thermocouple extension wire or not following the correct polarity will cause invalid readings Chapter 2 Quick Start for Experienced Users 13 Toensures 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 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 to ground as short as possible 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 RTD and resistance sensors this is at the module end For insulated ungrounded thermocouples this 15 at the module end Contact your sensor manufacturer for additional details Refer to ndustrial Automation Wiring and Grounding Guidelines Allen Bradley publication 1770 4 1 for additional information The terminal conn
86. ith 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 showed substantially less instability above 1000
87. l 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 Configuration Word 0 Bit 14 in chapter 4 for information on configuring the module to perform periodic autocalibration Compact 10 Universal Input module Chapter 2 Quick Start for Experienced Users Before You Begin This chapter can help you to get started using the 1769sc IF8u Universal input module We base the procedures here on the assumption that you have an understanding of Allen Bradley controllers You should understand electronic process control 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 Required Tools and Equipment Have the following too
88. l operates See the table below and the descriptions that follow for valid configuration settings and their meanings To Select Make these bit settings 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Channel Disable Enabled 0 Disabled 7870410970 1 Filter Frequency 60 Hz 0 0 50Hz 0 1 10 Hz 1 0 250 Hz __ 57 500 Hz 1kHz 11011 Open Circuit Upscale 0 0 Downscale 57 Last State 10 Zero 111 Input Type 4 to 20 mA Oto 20 mA 0 0 0 0 1 10 to 10 V 0 0 0 110 Oto 10V 0 0 0 1 1 1to5V 1 0to5V 0 0 1 0 1 100 mV 59722 50 mV 0 0 11 11 1 Type J 0 1 9 0 K TC 0 1 0 0 1 Type T TC 57972 0 1 0 1 1 TypeR TC 0 1 1 0 0 Type S TC 0 1 1 0 1 Type B TC _ a N TC 011111111 Type C TC 1 0 0 0 0 100 Pt 385 1 0 0 0 1 200 385 1 0 0 1 0 500 Pt 385 19972 1000 Pt 385 11011100 100 Pt 3916 1 0 1 0 1 200 3916 1 0 1 1 0 500 Pt 3916 puc BONNE 1000 Pt 3916 1 1 0 0 0 10 Cu 426 1 1 0 1 120 Ni 8 1 1 0 1 0 120 Ni 672 L mo 604 NiFe 518 1 1 1 0 0 150 ohm 1 1 1 1000 ohm 1 1 1 0 3000 ohm 2 Data Format Engineering Units X1 0 00 Engineering Units X10 0 0 1 Raw Proportional 0 1 0 Scaled for PID 0 1 Percentrange O 1 0 0 S S Cyclic Lead Comp Enable 0 Disable 1 2 4 Wire RTD Disable 0 Enable 1 N
89. lerances of 0 6 or 50 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 86 Compact IO Universal Input Module Type T Thermocouples This section describes Copper Versus Copper Nickel Alloy thermocouples called type T thermocouples This type is one ofthe 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 is typically copper of high electrical conductivity and low oxygen content that conforms to ASTM Specification 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 exceptionally 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
90. ley N A Powell R L Burns G W Scroger M G The nicrosil versus nisil thermocouple properties and thermoelectric 92 Compact IO Universal Input Module 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 46 Burley N A Hess R M Howie C F 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 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 F 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 SA Transactions 18 4 83 99 1979 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
91. ls and equipment ready medium blade or cross head screwdriver thermocouple or millivolt analog input device shielded twisted pair cable for wiring Belden 8761 or equivalent for millivolt and current inputs Belden 9501 9533 for RTD or shielded thermocouple extension wire for thermocouple inputs controller for example 8 MicroLogix 1500 or CompactLogix controller programming device and software for example RSLogix 500 or RSLogix 5000 What You Need To Do This chapter covers 1 Ensuring that your power supply is adequate 2 Attaching and locking the module Compact IO Universal Input module 3 Wiring the module 4 Configuring the module 5 Going through the startup procedure 6 Monitoring module operation Step 1 Ensure that your 1769 system power supply 1 has sufficient current outputto support your system configuration Reference Chapter 3 Installation and Wiring The modules maximum current draw is shown below 5V dc 24V dc 150 mA 45 mA NOTE The module cannot be located more than 8 modules away from the system power supply 1 The system power supply could be 1769 2 PB2 PA4 4 or the internal supply of the MicroLogix 1500 packaged controller Step 2 Attach and lock the module Reference Chapter 3 Installation and Wiring NOTE The module can be panel or DIN rail mounted Modules can be assembled before or after mounting Chapter 2 Qu
92. mV maximum for 0 10V inputs 25 C for 10 Hz 50 Hz and 60 Hz filters 10 mV maximum for 10V inputs 25 C for 10 Hz 50 Hz and 60 Hz filters System accuracy at 0 60 C 10 50 and 60 Hz filters 25 uV maximum for 50 mV inputs 0 60 for 10 Hz 50 Hz and 60 Hz filters 30 uV maximum for 100 mV inputs 0 60 for 10 Hz 50 Hz and 60 Hz filters 5 mV maximum for 0 5V inputs 0 60 for 10 Hz 50 Hz and 60 Hz filters 4 mV maximum for 1 5V inputs 0 60 for 10 Hz 50 Hz and 60 Hz filters 10 mV maximum for 0 10V inputs 0 60 C for 10 Hz 50 Hz and 60 Hz filters 20 mV maximum for 10V inputs 0 60 C for 10 Hz 50 Hz and 60 Hz filters Current Inputs System accuracy at 25 10 50 and 60 Hz filters 20 uA maximum for 0 20 mA inputs 25 for 10 Hz 50 Hz and 60 Hz filters 16 uA maximum for 4 20 mA inputs 25 for 10 Hz 50 Hz and 60 Hz filters System accuracy at 0 60 C 10 50 and 60 Hz filters 50 uA maximum for 0 20 mA inputs 0 60 C for 10 Hz 50 Hz and 60 Hz filters 40 uA maximum for 4 20 mA inputs 0 60 C for 10 Hz 50 Hz and 60 Hz filters RTD Inputs System accuracy at 25 10 50 and 60 Hz filters 0 5 C for Platinum 385 0 5 C for Platinum 3916 0 6 C for Nickel 0 3 C for Nickel Iron 0 6 for Copper System accuracy at 0 60 C 10 50 and 60 Hz filters 0 9 C for Platinum 38
93. mperature offset The figure below shows the CJC accuracy for each channel All accuracies displayed in degrees C EE aoaoga Note Using a remote terminal block can improve CJC accuracy When using remote terminal blocks remove the CJC sensor from the module RTB and mount it on the remote terminal block Be sure to use shielded twisted pair wire between the module and the remote terminal block Do not mount the remote terminal block near heat sources as it will cause inaccurate readings Chapter 3 Installation and Wiring 31 ATTENTION Do not remove or loosen the cold junction compensating thermistor assembly located between the two CJC terminals The thermistor assembly must be installed to ensure accurate thermocouple input readings on channels configured for thermocouple The module will operate in the thermocouple mode but at reduced accuracy if the CJC sensor is removed See Determining Open Circuit Response Bits 4 and 5 in chapter 4 Calibration 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 15 taken The A D converter uses these numbers to compensate for system offset zero and gain span errors
94. mple the voltage 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 3u V 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 50 5 percent between 870 C and 1700 C Type B thermocouples can also be supplied to meet special tolerances of 5 Appendix C Thermocouple Descriptions 75 Type E Thermocouples percent Tolerances are not specified for type B thermocouples below 870 C 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 the
95. mporary conductivity caused by condensation shall be expected 2 Over Voltage Category 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 3 Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission IEC designations Chapter 3 Installation and Wiring 19 Prevent Electrostatic Discharge ATTENTION Electrostatic discharge can damage integrated circuits or semiconductors if you touch analog module bus connector pins or the terminal block on the input module Follow these guidelines when you handle the module Touch a grounded object to discharge static potential Wear an approved wrist strap grounding device Do not touch the bus connector or connector pins Do not touch circuit components inside the module If available use a static safe work station When it is not in use keep 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 sending an erroneous signal to your system s field devices causing unintended machine motion causing an explosion in a hazardous environment Electrical arcing causes excessiv
96. n Input Types and Ranges Chapter 1 Module Overview This chapter describes the 1769 IF8u Universal Input Module and explains how the module reads current voltage RTD Resistance and thermocouple millivolt analog input data Included is information about the module s hardware and diagnostic features overview ofthe system and module operation compatibility The universal input module supports current voltage RTD resistance thermocouple and millivolt type inputs The module digitally converts and stores analog data from any combination mentioned above Each input channel is individually configured via software for a specific input device data format and filter frequency and provides open circuit over range and under range detection and indication Note There are 8 on board jumpers to configure between voltage and current modes In current modes the module measures the input current across a low drift precision resistor measures the voltage and converts to a current reading For any input other than direct current measurements the jumpers must be configured for voltage mode The tables below list the input types and their associated ranges input Type ms RTDType Temperature Range C Copper 426 100 to 260 Nckel 618 100 to 260 Nckel Iron 8 Baatinum 385 Platinum 3916 Compact 10 Universal Input module Data Formats Filter Frequencies Current Input Range
97. nal 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 5mV K roughly one third that of Appendix C Thermocouple Descriptions 81 type E thermocouples
98. negative SN 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 percent shall be alloyed with platinum of 99 99 percent purity to produce the 84 Compact IO Universal Input Module 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 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 and the SI volt was determined recently from new data obtained in an international collaborative effort involving eight national laboratories T
99. ng and Materials Vol 63 1185 1194 1963 19 Bentley R E Short term instabilities in thermocouples containing nickel based alloys High Temperatures High Pressures 15 599 611 1983 20 Kollie T G Horton J L Carr R Herskovitz M B Mossman C A Temperature measurement errors with type K Chromel vs Alumel 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 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 G W Strouse Mangum B W Croarkin M C Guthrie W F Chattle M New reference functions for platinum 13 rhodium versus platinum type and platinum 30 rhodium versus platinum 6 rhodium type B thermocouples based on the ITS 90 in Temperature Its Measurement and Control in Science and 90 Compact IO Universal Input Module Industry Vol 6 Schooley J F ed New York American Institute of Physics 1992 559 564 24 Glawe G E Szaniszlo A
100. ng 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 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 the table below Table 4 1 Input Data Table Word Bit 15 14 13 12 1 209 9 8 7 6 5 4 3 2 9 0 Analog Input Data Channel 0 Analog Input Data Channel 1 Analog Input Data Channel 2 Analog Input Data Channel 3 Analog Input Data Channel 4 Analog Input Data Channel 5 Analog Input Data Channel 6 Analog Input Data Channel 7 6 5 004 063 002 0061 000 57 56 55 54 53 52 51 SO U7 O7 U6 06 05 05 U4 04 U3 U2 02 U1 01 UO OO CJC Value Degrees C X 10 0 8501o 10 S8 O8 U8 8 Degrees F X 10 320 18501o 1 Changing bit values is not supported by all controllers Refer to your controller manual for details Input Data Values Data words 0 through 7 correspond to channels 0 through 7 and contain the converted analog input data from the input device The most significant bit bit 15 is the sign bit SGN General Sta
101. ning screws to 0 46 Nm 4 1 1n Ibs 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 NOTE 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 5 0 68 Nm 6 in Ibs NOTE If you need to remove the finger safe cover insert a screwdriver into one of the square 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 Wire Size Terminal Screw Torque Retaining Screw Torque Solid Cu 90 C 194 14 to 22 AWG 0 68 Nm 6 in lbs 0 46 Nm 4 1 in lbs Stranded Cu 90 C 194 F 16 to 22 AWG 0 68 Nm 6 in lbs 0 46 Nm 4 1 in Ibs Compact IO Universal Input module Wiring the Module ATTENTION To prevent shock hazard care should be taken when wiring the module to analog signal so
102. nnel step response channel cut off frequency effective resolution 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 Hz 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 10112 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 Improper earth ground may be a source of common mode noise NOTE Transducer power supply noise transducer circuit noise or process variable irregularities may also be sources of normal mode noise NOTE The filter frequency of the module s CJC sensors is the lowest filter frequency of any enabled thermocouple type to maximize th
103. o approximately one half the standard tolerances given above Tolerances are not specified for type J thermocouples below 0 C or above 7509 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 Appendix C Thermocouple Descriptions 79 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
104. ocated in Chapter 4 Memory Map Channel 0 Data Word Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Channel 4 Data Word Channel 5 Data Word Channel 6 Data Word Channel 7 Data Word Valid Input General Open circuit Status Bits Input Image 11 Words Over Under Range Status Bits Input ie Fun CJC Status Word Configuration 18 Words Module Configuration Word 0 Module Configuration Word 1 Channel 0 Configuration Word Configuration File Channel 1 Configuration Word Channel 2 Configuration Word Channel 3 Configuration Word Channel 4 Configuration Word Channel 5 Configuration Word Channel 6 Configuration Word Words 10 through 17 Channel 7 Configuration Word must be set to zero Words 10 through 17 Reserved Bit 15 Bit 1 102 Compact IO Universal Input Module For example to obtain the general status of channel 2 of the module located in slot e use address I e 6 2 Slot Word Bit Input File Type 0 2 Tue Bit Element Delimiter Delimiter Word Delimiter NOTE The end cap does not use a slot address 1769sc IF8U 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 in chapter 4 The configuration file is modified using the programming software configuration screen For an exam
105. oelement 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 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 ofthe type J thermocouples may change by as much as 40mV 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 C or 50 75 percent whichever is greater between 0 C and 7509 Type J thermocouples can also be supplied to meet special tolerances which are equal t
106. ofthe configuration tag in the Controller Tag data base Locak1 C Hool AB 1769_MODULE C 0 FE Local 1 C Reserved 1 Decimal DINT H Local 1 C Data Hsc Binary INT 198 l Local 1 C Data 0 2 0000_0000_0000_0000 Binary INT F Local C Datafl 2 0000_0000_0000_0000 Binary INT H Local 1 C Data 2 2 0000_0000_0000_0000 Binary INT Locat 1 C Data 3 280000 0000 0000 0000 Binary INT Local1 C Data 4 2 0000 0000 0000 0000 Binary INT EE Local 1 C Data 280000 0000 0000 0000 Binary INT Local 1 C Data 6 2 0000 0000 0000 0000 Binary INT EE Local 1 C Data 7 280000 0000 0000 0000 Binary INT LocatTCDatal8l 2 0000_0000_0000_0000 Binary INT FE Local 1 C Data 3 280000 0000 0000 0000 Binaty INT LocatTCDatal10 280000 0000 0000 0000 Binary INT Locat1 CDatal11 240000 0000 0000 0000 Binary INT EE LocalT C Data 12 280000 0000 0000 0000 Binary INT Locat1 C Datal13 280000 0000 0000 0000 Binary INT 1 14 2 0000_0000_0000_0000 Binary INT Locat1 C Data 15 280000 0000 0000 0000 Binary INT Locat T C Data 16 280000 0000 0000 0000 Binary INT Localt1 CData 17 240000 0000 0000 0000 Binary INT To configure the 1769sc IF8U 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 10 integer
107. on 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 exarrple the input range or input filter selection 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 62 Compact IO Universal Input module error field the extended error information field can contain error codes that are module specific or common to all 1769 analog modules NOTE 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 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 lists the possible module specific configuration error codes defined for the modules Error Codes The table below explains the extended error code Table 5 3 Extended Error Codes Error Type Hex Equivalent Module Error Code Extended Error Error Description P formation Code No error Fardware Watchdog reset error Specific Error X220 001 1 0010 0000 Critical code failure Failed calibration critical EEPROM failur
108. on since the resulting changes in their chemical 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 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 C and 1250 C and 2 2 C or 2 percent whichever is greater between 200 C and 09 In the 0 C to 1250 C range type 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 for AWG 30 0 25 mm These temperature limits apply to thermocouples used in conventio
109. onfiguration screen appears Module 1 OTHER I O Module ID Code 41 Expansion General Configuration Genetic Extra Data Config Vendor ID Product Type Product Cade Series Major Rev MinorRev Input Words Dutput Words Extra Data Length Ignore Configuration Error DK Help 106 Compact IO Universal Input Module When using the read IO configuration feature in RSLogix you need to manualy enter 18 into the extra data length field To configure the module select the Generic Extra Data Configuration tab Enter the decimal equivalent of each configuration word There are a total of ten words that need to be configured altogether The module default settings are used if all the configuration words are left at zero Module 1 OTHER 1 0 Module ID Code 41 xj Expansion General Configuration Generic Extra Data Config Offset Decimal Radix NOTE For a complete description of each of these parameters and the choices available for each of them refer to chapter 4 NOTE Words 10 through 17 are reserved and must contain zero Appendix F Configuring Your 1769sc IF8U Module with the Generic Profile for CompactLogix Controllers in RSLogix 5000 The procedure in this example is used only when your 1769sc IF8U Universal module profile is not available in RSLogix 5000 Programming Software The initial release ofthe CompactLogix5320 c
110. ontroller includes the 1769 Generic I O Profile with individual 1769 I O module profiles to follow To configure a 1769sc IF8U Universal 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 Vendor Allen Bradley Type 1769 L35E CompactLogix5335E Controlled OK X Revision 12 m Cancel Hedundancy Enabled Name Description A Help Slot o Create In CR SLogix 5000 Projects Browse Choose your controller type and enter a name for your project then click OK The following main RSLogix 5000 screen appears 108 Compact IO Universal Input Module 5 RSLogix 5000 Generic_Profile 1769 L35E File Edit View Search Logic Communications Tools Window Help 5 rv gr ee Pe ord NoFoces P I OK RN 56 pepe epe Eo po gt 1 4 TimeriCounter Tpu Output Compare lglxi Controller Generic Profile Controller Tags Controller Fault Handler C3 Power Up Handler 8 69 Tasks 5 69 MainTask MainProgram Unscheduled Programs B E Motion Groups Ungrouped Axes 3 Trends 5 69 Data Types User Defined Strings
111. ormed Channel Configuration Words 2 to 9 The default value of the configuration data is represented by zeros in the data file The structure of the channel configuration file is shown below Word Bi 15 14 13 12 11 10 9 8 7 6 5 4 SEE A 0 2 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 0 Disable 3 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 1 Disable 4 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 2 Disable 5 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 3 Disable 6 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 4 Disable 7 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 5 Disable 8 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 6 Disable 9 4 Wire Cyclic Data Format Input Type Open Circuit Filter Frequency Disable RTD Lead Channel Enable Comp 7 Disable Chapter 4 Module Data Status and Configuration 41 Each channel configuration word consists of bit fields the settings of which determine how the channe
112. ot 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 rail Chapter 3 Installation and Wiring 25 Field Wiring Connections 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 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 1n of separation for every 120V of power Routing field wiring in a grounded conduit can reduce electrical noise If field wiring must cross ac or power cables ensure that they cross at right angles If multiple power supplies are used with analog millivolt inputs the power supply commons must be connected Terminal Block Do not remove the CJC sensor from the terminal block if thermocouples are to be utilized Removal of the sensor will reduce accuracy For millivolt and current sensors use Belden 8761 shielded twisted pair wire or equivalent to ensure proper operation and high immuni
113. ous 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 C or 0 5 percent whichever is greater between 0 C and 900 C and 1 7 or 1 percent whichever is greater between 200 C and 0 C Type E thermocouples can also be supplied to meet special tolerances which are equal to 1 C or 50
114. ow your search for I O modules to configure into your system With the initial release ofthe CompactLogix5320 controller this screen only includes the Generic 1769 Module Click the OK button and the following default Generic Profile screen appears 1763 0001 Generic 1769 Module Parent Local r Connection Parameters Assembly Instance 5i ize Name pu Description 73 Output 104 p Configuration o E 16 bit Comm Format input Data INT Slot 1 Cancel Back Next gt Finish Help First select the Comm Format Input Data INT for the 1769sc IF8U then fill in the name field For this example IF8U is used to help identify 110 Compact IO Universal Input Module the module type in the Controller Organizer The Description field is optional and may be used to provide more details concerning this 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 1769sc IF8U Universal module is located in slot 1 The Comm Format Assembly Instance and Size values are listed in the following table for the 1769sc IF8U Universal module 1769 Comm Format Parameter Assembly Size Module Instance 16 bit IF8U Input Data INT Input 101 11 Output 104 0
115. ple using a type J thermocouple the range 210 C to 1200 is represented as 0 to 10095 See Determining Effective Resolution and Range Chapter 4 Module Data Status and Configuration 45 Selecting Input Type Bits 10 through 6 Bits 10 through 6 in the channel configuration word indicate the type of input device If channels 1 3 5 or 7 are configured for RTD or Resistance type the configuration for the following even channels 2 4 6 8 are ignored respectively It is recommended to set both channels identically 1 and 2 3 and 4 5 and 6 or 7 and 8 when setting a channel to RTD or Resistance mode This reduces confusion in the setup A zero will be reported in the input data word for the respective even channel in RTD mode to reflect the RTD or resistance mode configuration The 4 20 range is the default input type for each channel Note The on board jumpers must be changed to voltage mode if any other input type is desired other than current Determining Open Circuit Response Bits 5 and 4 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 Ifthe CJC sensor is removed from the module terminal block its open circuit bit is set 1 and the module continues to calculate thermocouple readings at reduced accuracy If an open CJC circuit is detected the module uses 25 C as th
116. ple of module configuration using RSLogix 500 see Configuring the 1769sc IF8U in a MicroLogix 1500 System Parameter Default Setting Disable Enable Channel Enabled Filter Frequency 60 Hz Open Circuit Upscale Input Range 4 to 20 mA Engineering Data Format Units X1 Cyclic Lead Comp Enabled 4 Wire RTD Disabled Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 103 Configuring the 1769sc IF8U in a MicroLogix 1500 System This example takes you through configuring your 1769scIF8U universal analog 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 x File Edit View Search Comms Tools Window Help El amp X Ba i8 J2 amp 9 mgjgamms xe OFFLINE E No Forces E 936 o 9 mm pl H No Edits Forces Enabled Driver AB_DF1 1 Node 14 User Bit Timer Counter Input Output Compare Sy Project Controller i Controller Properties 9 Processor Status Function Files Configuration be Channel Configuration E C Program Files SYS0 SYS1 Lap2
117. portion of the Controller Organizer Based on the Generic Profile created earlier for 1769sc IF8U module the Controller Tags screen looks like the following 6 RSLogix 5000 Generic_profile 1769 135 Controller Tags Generic_profile controller laj xj ij Edt View Search Logic Communications Tools Window Help S e Offline 08 F RUN Fron ore NoForces T OK mcer B 4 Comp c Sot TagNeme gt Foroe Mask E Controller Generic profile B con Description AB TTES MODULE CO AB 1769 MODULE INT 268 0 Ethernet Port LocalENB EB CompactBus Local 8 11 1769 MoDULE IF8U gt Tags f Et Tags 7 Tag addresses are automatically created for configured I O modules local I O addresses are preceded by the word Local These addresses have the following format Input Data Local s I Configuration Data Local s C Where s is the slot number assigned the I O modules in the Generic Profiles 112 Compact IO Universal Input Module Configuring a 1769sc IF8U Universal Module 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
118. r 30 6 The positive BP thermoelement typically contains 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 ASTM 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 Compact IO Universal Input Module thermoelements will typically have significant impurities of elements such as palladium iridium iron and silicon 38 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 R 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 be used intermittently for several hours up to 1790 C and continuously for sever
119. rature Scale of 1990 ITS 90 Natl Inst Stand Technol Tech Note 1265 1990 August 190 p 4 The 1976 Provisional 0 5 to 30 K 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 Tech Publ 470B edited by Benedict R P Philadelphia ASTM 1981 258p 6 Hansen M Anderko K 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 61p 9 Starr 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 J 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 22009 J Res Natl Bur Stand U S 24 205 224 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
120. rmocouples This type and 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 09 for any of the letter desi
121. rtional Data Scaled for PID Percent Range Chapter 4 Module Data Status and Configuration Table 4 2 Channel Data Word Format Data Format Input Type Engineering Units x 10 Engineering Units x 1 Scaled For PID Proportional Counts Percent Range Celsius Fahrenheit Celsius Fahrenheit J 210 to 1200 3460 to 21920 16383 32767 to 32767 0 to 10000 K 270 to 1370 4540 to 24980 010 16383 32767 to 32767 0 to 10000 T 270 to 400 4540 to 7520 0 to 16383 32767 to 32767 0 to 10000 E 270 to 1000 454 1832 2700to 10000 4540 to 18320 01 16383 32767 to 32767 0 10000 R 0 to 1768 32 to 3214 0 to 17680 320 to 32140 0 to 16383 32767 to 32767 0 10000 S 0 to 1768 32 to 3214 0 to 17680 320 to 32140 0 to 16383 32767 to 32767 0 B 300 to 1820 572103308 300010 18200 5720 to 32767 01 16383 32767 to 32767 0 10000 210 to 1300 346 to 2372 2100 to 13000 3460 to 23720 0 16383 32767 to 32767 0 to 10000 6 0 to 2315 320 to 32767 0 to 16383 32767 to 32767 0 10000 50 mV 500 to 5002 5000 to 50002 0 to 16383 32767 to 32767 O to 10000 100 mV 1000 to 1000 1000 to 1000 10000 to 10000 10000 to 10000 010 16383 32767 to 32767 010 10000 0 5V 0 to 500 0 to 500 0 to 5000 0 to 5000 0 to 16383 32767 to 32767 0 10000 1 5V 100 to 500 100to 5002 1000 to 5000 1000to 5000 0 to 16
122. s 56 ms 56 ms 174 ms 174 ms 174 ms 168 ms 690 ms 56 Compact IO Universal Input module Safety Considerations Chapter 5 Diagnostics and Troubleshooting This chapter describes troubleshooting the universal input module This chapter contains information on safety considerations while troubleshooting internal diagnostics during module operation module errors contacting Spectrum Controls Inc 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 personnel remain clear ofthe equipment The problem could be intermittent and sudden unexpected machine motion could occur Have someone ready to operate an emergenc
123. s RTD Resistance 0 channels Voltage Current Thermocouple 4 channels RTD Resistance Compact 10 Universal Input module Thermocouple and RTD measurements are linearized using the specifications listed in the table below Input Type Specification 2000 PU 585 5000 388 10000 385 1000 3916 200043976 500043976 10000715516 100 01226 2 K T E R 5 B N c Thermocouple measurements utilize a single cold junction compensation sensor placed in the center ofthe terminal block Thermocouple support includes types J K T E R S B N C with a range to 100 mV In thermocouple mode the 1769sc IF8u will measure thermocouple and CJC sensor voltages and convert the results to a linearized temperature reading RTD support includes types Pt 385 Pt 3916 N1618 N1672 and Cu 426 In RTD and resistance modes the module will inject a constant current through the RTD or resistor measure the voltage across the resistance and convert to a linearized temperature or resistance reading RTD and resistance input types support 2 3 or 4 wire resistance measurements When configured for current or voltage type inputs the module converts the analog values directly into digital counts Chapter 1 Module Overview 7 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 interna
124. s 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 IF8u Grounded Junction with Shielded Cable Metal Sheath with Electrical Continuity to Thermocouple Signal Wires Spectrum Controls recommends that a grounded junction thermocouple have a protective sheath made of electrically insulated material for Using an Ungrounded Isolated Junction Thermocouple Using an Exposed Junction Thermocouple Appendix D Using Thermocouple Junctions 97 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 using frequent or rapid temperature cycling For this type of thermocouple junction the response time is longer than for the grounded junction Measuring Junction Isolated from Sheath An exposed junction thermocouple uses a measuring junction that does not have a protective metal sheath A t
125. solutes particularly iron The negative thermoelement TN or EN 15 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 The 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 or 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 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 resear
126. ting Technical Assistance Declaration of Conformity Note that your module contains electronic components which are susceptible to damage from electrostatic discharge ESD An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material In the unlikely event that the module should need to be returned to Spectrum Controls please ensure that the unit is enclosed in approved ESD packaging such as static shielding metallized bag or black conductive container Spectrum Controls reserves the right to void the warranty on any unit that 1s improperly packaged for shipment For further information or assistance please contact your local distributor or call the Spectrum Controls technical Support at USA 425 746 9481 Available upon request GLOBAL PARTNER 2003 Spectrum Controls Inc All rights reserved Specifications subject to change without notice The Encompass logo and ControlLogix are trademarks of Rockwell Automation Publication 0300198 02 Rev C July 2004 Printed in U S A Corporate Headquarters Spectrum Controls Inc P O Box 5533 Bellevue WA 98006 USA Fax 425 641 9473 Tel 425 746 9481 Web Site www spectrumcontrols com E mail spectrum spectrumcontrols com SPECTRUM O N T R L S
127. tion Systems Catalog publication B113 18 Compact IO Universal Input module Power Requirements General Considerations The module receives power through the bus interface from the 5 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 150 mA 45 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 1 and to circuits not exceeding Over Voltage Category II 2 IEC 60664 1 3 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 EXPLOSION HAZARD Substitution of components may impair suitability for Class Division2 Do not replace components 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 This product must be installed an enclosure 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 te
128. tus Bits 50 to S7 Bits SO through S7 of word 8 contain the general status information for channels 0 through 7 respectively Bit S8 of word 10 contains general status information for the CJC sensor If set 1 this bit indicates an error over or under range open circuit or input data not valid condition associated with that channel or CJC The data not valid condition is described below Chapter 4 Module Data Status and Configuration 35 Input Data Not Valid Condition The general status bits 50 to S7 also indicate whether or not the input data for a particular channel 0 through 7 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 the A D converter can provide valid properly configured data to the 1769 bus master controller The following information highlights the bit operation ofthe Data Not Valid condition 1 The default and module power up bit condition 15 reset 0 2 The bit condition 15 set 1 when a new configuration 15 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 bein
129. ty to electrical noise For RTD and resistance sensors use Belden 9501 2 wire 9533 3 wire and 83503 for runs over 100 feet or equivalent 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 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 26 Compact IO Universal Input module 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 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 Keep cable shield connections to ground as short as possible 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 th
130. urces 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 Belden 8761 for non thermocouple applications excluding RTDs and Belden 9533 or 83503 for RTD Resistance type inputs To Module To Analog Input Cable Ki Signal Wire Foil Shield Signal Wire Signal Wire Signal Wire Drain Wire To wire your module follow these steps 1 At each end of the cable strip some casing to expose the individual wires 2 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 careful when stripping wires Wire fragments that fall into a module could cause damage at power up 3 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 for more details 4 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap 5 Connect the signal wires to the terminal block Connect the other end of the cable to the analog input device 6 Repeat steps 1 through 5 for each channel on the module NOTE See Appendix D Using Thermocouple Junctions
131. wever 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 oftype 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 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
132. y stop switch in case it becomes necessary to shut off power Program Alteration There are several possible causes of alteration to the user program including extreme environmental conditions Electromagnetic Interference 58 Compact IO Universal Input module Module Operation vs Channel Operation Power up Diagnostics 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 CompactLogix 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 detect
133. y the target controller If the communication settings are correct click on Read IO Config Read IO Configration from Online Processor x Driver Route Processor Node DF1 1 local fi Decimal 21 Octal Last Configured AB_DF1 1 Node 1d local Reply Timeout 0 Sec Who Active Cancel Read IO Config Help The actual I O configuration 15 displayed In this example a second tier of Appendix E Module Configuration Using MicroLogix 1500 and RSLogix 500 105 is attached to the MicroLogix 1500 processor 1 0 Configuration Current Cards Available Fiter anio Pat Description Ial Read IO Config 17584015 16 Input 10 30 VDC 17694950 w4 6 Input 24 VDC 4 Output RLY 1769 16 6 Channel RTD Module 1769 IT6 B Channel Thermocouple Module 1769 048 8 Output 120 240 VAC 1769 0416 16 Output 120 240 VAC Micrologix 1500 LSP Series B 1769 0816 16 Dutput 24 VDC Source 1 0 Module ID Code 41 1769 0B16P 16 Dutput 24 VDC Source w Protectior 1769 0F2 Analog 2 Channel Output Module 16 Output 24 VDC Sink 8 Dutput Relay 16 Output Relay 8 Output Isolated Relay DeviceNetScanner Power Supply Power Supply Power Supply Power Supply Any 1769 PowerSupply Any 1769 UnPowered Cable Ady Config H Hide All Cards Other Requires 1 0 Card Type ID The 1769sc IF8U module is installed in slot 1 To configure the module double click on the module slot The general c

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