Home

1794-6.5.7, Thermocouple/Millivolt Input Module, User Manual

1. SISISISISISIS S wr 4 Millivolt Source Millivolt input Channel 1 Channel 0 Terminals 0 1 and 17 Example of 3 wire Thermocouple Wiring to a 1794 TB3T Temperature Terminal Base Unit 0 1 2 3 4 5 6 7 8 9 10 nn B M4 15 0 I 2 3 n 5 6 7 8 p 1j I m B WA J5 T S S ISISISISI SISISIS SS S d 8 7 7 n m pm T mp SISISISISISIS 39 40 m V 5 Hu H S SIS Cold J unction Compensator Allen Bradley PN 969424 01 2 supplied with module Channel 0 Terminals 0 1 and 39 Publication 1794 6 5 7 2 8 How to Install Your Thermocouple mV Input Module Module Indicators The thermocouple mV module has one status indicator that is on when power is applied to the module This indicator has 3 different states Bi LO Allen Bradley 1794 IT8 THERMOCOUPLE INPUT 8 CHANNEL emm Os INPUTO INPUT1 JNPUT2 INPUT3 INPUT4 INPUT5 INPUT 6 INPUT 7 K LLL o oco 4 c4 cy o A Status Indicator indicates diagnostic results and configuration status B Insertable label for writing individual input designations Color Meaning Red Indicates a critical fault diagnostic failure etc Blinking Indicates a noncritical fault such as open sensor input out of range etc Green Module is configured and fully operational Blinking Module is functional but not configured
2. Manual DeviceNetM anager Software User Manual ko 1787 6 5 3 Industrial Automation Wiring and Grounding Guidelines 1770 4 1 1794 FLEX I O Product Data 1794 2 1 DeviceNet Adapter 1794 5 14 1794 6 5 5 Remote I O Adapter 1794 5 46 1794 6 5 9 This preface gave you information on how to use this manual efficiently The next chapter introduces you to the remote I O adapter module Chapter Objectives The FLEX I O System Adapter Power Supply How FLEX I O Analog Modules Communicate with Programmable Controllers Chapter 1 Overview of FLEX I O and your Thermocouple mV Module In this chapter we tell you e what the FLEX I O system is and what it contains e how FLEX I O modules communicate with programmable controllers e the features of your thermocouple module FLEX I O is a small modular I O system for distributed applications that performs all of the functions of rack based I O The FLEX I O system contains the following components shown below Terminal Base 1 0 Module UL AV DA DA l re erer 3 OOOOOO SOOCOOOOOOOOOOCO 9OOOCOOOOOOOCODOO 20125 e adapter power supply powers the internal logic for as many as eight I O modules terminal base contains a terminal strip to terminate wiring for thermocouple or millivolt inputs e UO module contains the bus interface
3. Table 2 A Wiring connections for the 1794 IT8 Thermocouple Input Module Thermocouple S Channel High Signal Low Signal Shield High Signal Low Signal Shield Terminal 4 Terminal Return Terminal Terminal Return 17 1 NEN NEN Lus 3 s 3 3 3 pcm L3 3 5 EO 3 7 ye 3 5 3 REN oo L3 pw ox 5 u s NEN L x 9 31 l 24V dc Common 16 thru 33 16 17 19 21 23 25 27 29 31 and 33 24V dc power 1794 TB2 34 and 51 1794 TB3 34 thru 51 34 35 50 and 51 1 Terminals 39 to 46 are chassis ground 2 Terminals 36 37 38 and 47 48 49 are cold junction compensator terminals Publication 1794 6 5 7 How to Install Your Thermocouple mV Input Module 2 7 ATTENTION The thermocouple mV modules do not receive power from the backplane 24V dc power must be applied to your module before operation If power is not applied the module position will appear to the adapter as an empty slot in your chassis If the adapter does not recognize your module after installation is completed cycle power to the adapter ATTENTION Total current draw through the terminal base unit is limited to 10A Separate power connections to the terminal base unit may be necessary Example of Millivolt Input Wiring to a 1794 TB3 Terminal Base Unit SISISISISIS s SISISISISIS 168
4. wy Allen Bradley Thermocouple Millivolt Input User Pe Manual Cat No 1794 IT8 Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout this manual we make notes
5. 175 to 800 C pi 1 oo jo odule reports cold junction temperature for channels 00 03 Pi fi fof odule reports cold junction temperature for channels 04 07 No sensor connected do not scan Channel 1 Thermocouple Type see bits 00 03 Channel 2 Thermocouple Type see bits 00 03 Channel 3 Thermocouple Type see bits 00 03 Write Word 3 00 03 00 03 Channel 4 Thermocouple Type see write word 2 bits 00 03 Channel 5 Thermocouple Type see write word 2 bits 00 03 Channel 6 Thermocouple Type see write word 2 bits 00 03 12 15 14 17 Channel 7 Thermocouple Type see write word 2 bits 00 03 po fi fi jo S 50t01768 C Publication 1794 6 5 7 April 1997 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter 5 7 Defaults Each I O module has default values associated with it At default each module will generate inputs status and expect outputs configuration Module Defaults for Factory Defaults Real Time Size Catalog arr Input Output Input Output Number Piedad kn Default Default Default Default 1794 IT8 8 Thermocouple Input 4 o Factory defaults are the values assigned by the adapter when you e first power up the system and no previous stored settings have been applied For analog modules the defaults reflect the actual number of input words output words For example for
6. d Publication 1794 6 5 7 March 1997 Type R Thermocouple 300 150 0 150 300 450 600 750 _900 1050 1200 1350 1500 1650 1800 50 238 32 302 572 82 112 1382 1652 1022 7192 2462 2732 3002 3272 ec Temperature ar Type S Thermocouple 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 7 508 238 32 7302 7572 822 M12 1382 1652 1922 72192 2462 2732 3002 3272 9c Temperature ge Specifications A 7 Type T Thermocouple C Resolution er 1000Hz 500Hz 250Hz 10 100Hz 102 4 25 00 6 40 0 80 18413 7600 11522 IM 89 60 22 40 5 60 0 70 T6013 3032 I008 126 76 80 19 20 4 80 0 60 64 00 16 00 4 00 0 50 5120 12 80 320 0 40 38 40 9 60 240 0 30 25 60 6 40 1 60 0 20 12 80 3 20 0 80 0 10 300 150 0 150 300 450 600 7 508 7 238 UX 7302 57 9m TIN Temperature C Type N Thermocouple i 2E Resolution er 1000Hz 500Hz 250Hz 10 100Hz 128 0 32 00 8 00 1 00 2304 5760 AN TW 102 4 25 60 6 40 0 80 T3435 7608 I1522 Tat 76 80 1920 480 0 60 5120 12 80 320 0 40 25 60 64 1 60 0 20 300 150 0 150 300 450 600 750 900 1050 1200 1350 508 238 3 32 52 W2 HD BB 1602 122 Z 2462 eC Temperature s Template revised J une 23 1995 Publication 1794 6 5 7 March 1997 A 8 Specifications Type
7. to get to the calibration screen 1794 IR8 IT8 1 0 Module Calibration Channel Selection Calibration Type Offset Calibration C Gain Calibration Input Data Values T Channel 1 Start Calibration T Channel 3 T Channel 4 T Channel 5 T Channel 6 T Channel 7 Calibration Status 5 Click on the channels you want to calibrate 6 Click on the radio button for offset calibration Then click on Leis 1794 1R8 IT8 YO Module Calibration Calibration Type Offset Calibration Gain Calibration Channel Selection o Input Data Values X Channel 0 T Channel 1 T Channel 2 Channel 3 T Channel 4 Channel 5 Channel 6 T Channel 7 Calibration Statu Offset Calibration Successful 7 When calibration is complete a notification will appear on the calibration status line Publication 1794 6 5 7 April 1997 6 10 Calibrating Your Module Gain Calibration Make sure that you have calibrated the offset for this channel before calibrating the gain 1 Connect 75 000mV across each input channel Connect all high signal terminals together and attach to the positive lead from the precision voltage source Connect all low signal terminals together and attach to the negative lead 2 Click on the channels you want to calibrate 1794 1R8 IT8 WO Module Calibration Channel Selection Calibration Type Input D
8. 0 to 1 Monitor the cal done bit 09 in read word 10 If the calibration is successful the cal done bit will be set to 1 Verify that the bad cal bit 10 in read word 10 and the cal range bit O8 in read word 10 are not set 0 Send another BTW to set the cal clk bit 07 in write word 0 to 0 Send another BTW to set the hi lo bit bit 06 in write word 0 to 0 Monitor the cal done bit 09 in read word 10 The cal done bit will be reset to 0 If individually calibrating channels repeat steps 1 through 7 for offset calibration on any additonal channels you want to calibrate 10 Send a block transfer write to the module to clear all calibration mask bits to 0 Publication 1794 6 5 7 April 1997 6 8 Calibrating Your Thermocouple mV Module using DeviceNetManager Software Cat No 1787 MGR Publication 1794 6 5 7 April 1997 Calibrating Your Module The following procedure assumes that you are using DeviceNetManager software cat no 1787 MGR and have the thermocouple mV module installed in a working system Offset Calibration Inputs can be calibrated one at a time or all at once To calibrate the offsets for all inputs at once proceed as follows 1 Connect 0 000V across each input channel Connect all high signal terminals together and attach to the positive lead from the precision voltage source Connect all low signal terminals together and attach to the negative lead 2 Apply po
9. F 2 20 C PC 3 96 F F S 1 00 C 1 80 F 2 00 C PC 3 60 F F T am 40 549F 40 54 C C 1 08 F F N 0 34 C 30 619F 30 689C 9C 01 220F 0F C 40 139 40 23cF 0 260C PC 0 46 F F L 40 190 0 300F 0 370C 0C 0 620F 0F mV 12uV H2yuV 24uV PC 24pV F Note The filter is enabled by setting bit 02 in write word 0 Template revised J une 23 1995 Publication 1794 6 5 7 March 1997 A 10 Specifications Publication 1794 6 5 7 March 1997 General Appendix B Thermocouple Restrictions Extracted from NBS Monograph 125 IPTS 68 Following are some restrictions extracted from NBS Monograph 125 IPTS 68 issued March 1974 on thermocouples B E J K R S and T B Platinum 30 Rhodium vs Platinum 6 Rhodium Type Thermocouples The ASTM manual STP 470 1970 indicates the following restrictions on the use of B type thermocouples at high temperatures They should not be used in reducing atmospheres nor in those containing metallic or nonmetallic vapors unless suitably protected wiht nonmetallic protecting tubes They should never be inserted directly into a metallic primary tube At temperatures below 450C the Seebeck coefficient of Type B thermocouples becomes quite small and is almost negligible in the normal room temperature range Consequently in most applications the reference junction temperature of the thermocouple does not need to be controlled or even kn
10. L Thermocouple ec Resolution CERO 1000Hz 500Hz 250Hz 10 100Hz 93 69 1171 146 018 2006 530 346 323 68 00 851 1 06 0 13 1545 47 3 33 9 32 2 4249 531 0 66 0 08 1084 415 331 321 17 04 213 026 003 626 358 324 320 0 200 150 100 0 50 100 200 300 400 500 _600 700 w 328 238 M8 32 12 212 392 572 752 932 112 NM 1472 e rra Worst Case Accuracy for the Thermocouple mV Module Accuracy 25 C Accuracy 77 F Temperature Drift input Type 0 60 C 32 9F 8 cec s ome anoe e f xem o owe suem I oe am ow sume Kk aoc 1 80 F 0 186 C PC 0 186 F F 5 BI 6 679F 0 651 C PC 40 6519F DE T 0 67 C L210F 0 1749C C 0 1749F OF N 1 07 C 1 93 F 0 223 C PC 0 2230F F t 340C 1612 0 434 C PC 0 4349F OF L 0 58 C 1 350F 0 1190C PC 0 1199F OF Cw ew ow SUM m Publication 1794 6 5 7 March 1997 Specifications A 9 Error Due to Open Circuit Current Through Loop Resistance Input Type Error per Ohm of Loop Resistance mV 0 417uV 2 4Q 1 LSB of error Worst Case Repeatability for the Thermocouple mV Input Module Input Type konya wita pier mi CN nd a B aoc 1 80 F 2 00 C C 3 60 F F E 0 160C 4029 0 32 C PC 0 58 F F 0 20 C 40 36F 0 40 C C 0 72 F F K 0 282C 0 50 F 0 56 C C 1 00 F F R 1 10 C 1 98
11. Module not powered Chapter Summary In this chapter you learned how to install your thermocouple mV module in an existing programmable controller system and how to wire to the terminal base units Publication 1794 6 5 7 Chapter Objectives Block Transfer Programming Chapter 3 Module Programming In this chapter we tell you about e block transfer programming sample programs for the PLC 3 and PLC 5 processors Your thermocouple mV module communicates with the processor through bidirectional block transfers This is the sequential operation of both read and write block transfer instructions A configuration block transfer write BTW is initiated when the thermocouple module is first powered up and subsequently only when the programmer wants to enable or disable features of the module The configuration BTW sets the bits which enable the programmable features of the module such as scaling alarms ranges etc Block transfer reads are performed to retrieve information from the module Block transfer read BTR programming moves status and data from the module to the processor s data table The processor user program initiates the request to transfer data from the module to the processor The transferred words contain module status channel status and input data from the module ATTENTION If the thermocouple mV module is not powered up before the remote I O adapter the adapter will not recognize the module Make certai
12. at 20K is only about one half of that of Type E thermocouples Furthermore the thermoelectric homogeneity of KN thermoelements is generally not quite as good as that of EN thermoelements Both the KP and the KN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures Type K thermocouples are recommended by the ASTM 1970 for continuous use at temperatures within the range 250 to 1260C in oxidizing or inert atmospheres Both the KP and the KN thermoelements are subject to oxidation when used in air above about 850C but even so Type K thermocouples may be used at temperatures up to about 1350C for short periods with only small changes in calibration They should not be used in sulfurous reducing or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes They should not be used in vacuum at high temperatures for extended times because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration They should also not be used in atmospheres that promote green rot corrosion those with low but not negligible oxygen content ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type K commercial thermocouples be 2 2C between 0 and 277C and 3 4 percent between 277 and 1260C Limits of error are not sp
13. between 93 and 371C Type T thermocouples can also be supplied to meet special limits of error which are equal to one half the standard limits of error given above plus a limit of error of 1 percent is specified between 184 and 59C The recommended upper temperature limit for protected Type T thermocouples 371C applies to AWG 14 1 6mm wire For smaller wires it decreases to 260C for AWG 20 0 8mm and 240C for AWG 24 or 28 0 5 or 0 3mm Use this template for your appendices If it were not for the different running head this would be your chapter 4 document Numbers 1794 TB3 example thermocouple connection 2 7 A accuracy worst case A 1 adapter input status word 5 1 B bitlword description thermocouple module 17941781 4 4 5 4 ock transfer read 1 2 write 1 2 ock transfer programming 3 1 ock transfer read 4 4 1794 IT8 4 4 5 3 ock Ane pa 1794 78 4 4 5 4 configuration block 1794 178 4 4 5 4 input range selection 4 2 co o oc co C calibration gain 6 8 manual 6 4 offset 6 7 periodic 6 1 preparation types of 6 1 using decade box 6 4 using DeviceNetManager 6 9 using resistors 6 4 calibration flow chart 6 3 calibration words 6 1 cold junction compensators 1 4 cold junction connection wiring 2 4 communication between module and adapter 1 2 compatible terminal bases 2 3 configurable features 4 1 connecting CJ C 2 4 Index connecti
14. detected Read Word 11 Cold J unction sensor underrange bit this bitis set if the cold junction temperature is below 0 C 00 00 01 01 Cold J unction sensor overrange bit this bitis set if the cold junction temperature is above 70 C 02 02 Bad Structure this bit is set if there is an invalid thermocouple type selected Publication 1794 6 5 7 April 1997 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter 5 5 Decimal Bit er Word Octal Bit Description Read Word 11 03 03 Powerup bit this bit is set 1 until configuration data is received by the module ronnie 04 06 04 06 Critical Fault bits If these bits are anything other than zero return the module to the factory for repair 07 07 Unused set to 0 08 10 Calibration Range bit set to 1 if a reference signal is out of range during calibration 09 11 Calibration Done bit set to 1 after an initiated calibration cycle is complete 10 12 Calibration Bad bit set to 1 if the channel has not had a valid calibration 11 15 13 17 Unused set to 0 Write Word 1 00 01 00 01 Module Data Type Bit 01 EN Definition 0 EM C default 1 EN Bipolar counts scaled between 32768 and 432767 1 Unipolar counts scaled between 0 and 65535 Bit 02 02 Fixed Digital Filter When this bit is set 1 a software digital filter is enabled This filter settles to 100 of a Full Scal
15. hi 8 Bit Calibration Mask Filter Cutoff Thermocouple 3 Type Thermocouple 2 Type Thermocouple 1 Type Thermocouple 0 Type Thermocouple 7 Type Thermocouple 6 Type Thermocouple 5 Type Where FDF fixed digital filter bit Thermocouple 4 Type Word Bit Descriptions for the 1794 IT8 Thermocouple m V Input Module Decimal Bit m Word Octal Bit Description Read Word 0 00 15 Read Word 1 00 15 Read Word 2 00 15 Read Word 3 00 15 Read Word 4 00 15 00 17 Reserved 00 17 Channel 0 Input data 00 17 Channel 1 Input data 00 17 Channel 2 Input data 00 17 Channel 3 Input data Read Word 5 00 15 00 17 Channel 4 Input data Read Word6 o 15 0 17 Channel 5 Inputdata 0000000000000000 Read Word7 00 15 00 17 Chamnel 6 Inputdata 00000000000000000 Read Word 8 00 15 00 17 Channel 7 Input data Read Word 9 00 07 00 07 Underrange bits these bits are set if the input signal is below the input channels minimum range 08 15 10 17 Overrange bits these bits are set if 1 the input signal is above the input channel s maximum range or 2 an open detector is detected Read Word 10 00 00 1 2 Cold J unction sensor underrange bit this bit is set if the cold junction temperature is below 0 C Cold J unction sensor overrange bit this bitis set if the cold junction temperature is above 70 C o e Bad Structure this bit is set if an invalid thermocouple type i
16. the 8 thermocouple input analog module you have 11 input words and 4 output words You can change the I O data size for a module by reducing the number of words mapped into the adapter module as shown in real time sizes Real time sizes are the settings that provide optimal real time data to the adapter module Analog modules have 15 words assigned to them This is divided into input words output words You can reduce the I O data size to fewer words to increase data transfer over the backplane For example an 8 thermocouple input module has 11 words input 4 words output with factory default You can reduce the write words to 0 thus eliminating the configuration setting and unused words And you can reduce the read words to 10 by eliminating the calibration status words For information on using DeviceNetManager software to configure your adapter refer to the DeviceNetManager Software User Manual publication 1787 6 5 3 Publication 1794 6 5 7 April 1997 5 8 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter Publication 1794 6 5 7 April 1997 Chapter Objective General Information Chapter 6 Calibrating Your Module In this chapter we tell you e what tools are needed to calibrate e how to calibrate out lead wire resistance e calibrate your module manually calibrate your module using DeviceNetManager software Your module is shipped to you already calibrated If a calibra
17. the first notch of this filter during module configuration The selection influences the A D output data rate thus affecting system throughput The number of channels included in each input scan also affects system throughput Mapping Data into the FLEX I O thermocouple module data table mapping is shown below Image Table Thermocouple mV Input Module 1794 IT8 Image Table Mapping Module Image Input Data Channel 0 Input Data Channel 1 TNR Input Data Channel 2 Input Size Input Data Channel 3 1to 11 Words C Input Data Channel 4 Input Data Channel 5 Input Data Channel 6 Input Data Channel 7 Calibration Status E Output Size 0 to 3 Words gt Calibration Mask Configuration Thermocouple Type Thermocouple Type Thermocouple mV Input Module 1794 IT8 Read mwempsTw s e s wTw ww v Ga Ga Go Tw T9 omm ww TSTS w w orw w w o w wo Read Word 1 Reserved ReadWor2 Channel 0 Input Data ReadWorl3 Channel 1 Input Data ReadWorl4 Channel 2 Input Data ReadWord5 Channel 3 Input Data ReadWord6 Channel 4 Input Data Publication 1794 6 5 7 April 1997 5 4 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter Dec Bit 15 14 13 12 10 09 08 07 06 05 afos 0 o 00 Octal Bit 17 16 15 14 12 11 10 07 06 05 ajos 0 pon 00 Read Word 7 Channel 5 Input Data Read Word 8 Channel 6 Input Data Read Word 9 Channel 7 Input Data Read Word 10 Overrange Bits Unde
18. to alert you to possible injury to people or damage to equipment under specific circumstances ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention helps you identify a hazard e avoid the hazard e recognize the consequences Important Identifies information that is especially important for successful application and understanding of the product Important We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss DeviceNet DeviceNetManager and RediSTATION are trademarks of Allen Bradley Company Inc PLC PLC 2 PLC 3 and PLC S are registered trademarks of Allen Bradley Company Inc Windows is a trademark of Microsoft Microsoft is a registered trademark of Microsoft IBM is a registered trademark of International Business Machines Incorporated All other brand and product names are trademarks or registered trademarks of their respective companies Summary of Changes New Information Updated Information Summary of Changes The information below summarizes the changes to the company wide templates since the last release The following new information has been added to this manual the L type thermocouple selection has been added for use in some European markets Calibration procedures have been revised to eliminate 1 method in order to b
19. transfer data from the thermocouple mV input module to the processor Mapping Data for the The following read and write words and bit word descriptions Analog Modules describe the information written to and read from the thermocouple mV input module The module uses up to 11 words of input image and up to 3 words of output image Each word is composed of 16 bits Thermocouple mV Input Module 1794 IT8 Image Table Mapping Module Image Input Data Channel 0 Input Data Channel 1 hen Input Data Channel 2 Input Size Input Data Channel 3 1 to 11 Words e Input Data Channel 4 Input Data Channel 5 L on n Output Size 0 to 3 Words gt Calibration Mask Configuration Thermocouple Type Thermocouple Type Thermocouple mV Input Module 1794 IT8 Read bepaal Tw TS TRT S TR oe e e w w Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Read Word 0 Reserved 1 Channel 0 Input Data Channel 1 Input Data Channel 2 Input Data Channel 3 Input Data Channel 4 Input Data Channel 5 Input Data Channel 6 Input Data Channel 7 Input Data eJ w N S SS lsx e a GU cv col s Oy uU Publication 1794 6 5 7 April 1997 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter 4 5 Overrange Bits 0 Bad Cal Cal Done Thermocouple mV Input Module 1794 IT8 Write EE CG ES A Ho RES EARN 99 61293 618 I e SN RC 0958 PORE Cal Cal
20. 0000 gDOO0O000000000000 qODOO0000000000000 OOOOOOOOOOOOOOCO e Note All modules must be analog modules for this configuration Discrete Module OOOOOOOOOOOOOOOO OOOO000000000000 Note Use this configuration if using any noisy dc discrete 1 0 modules in your system Thermocouple module wiring separate from discrete wiring Wiring when total current draw is greater than 10A Thermocouple or Analog Module OOO00000000000000 OOOO0000000000000 Thermocouple or Analog Module Thermocouple or Analog Module OOOOOOOOOOOOOOOO OOOO0000000000000 q9000000000000000 qDO00000000000000 KqDOOOO000000000000 Discrete Individual Module OOOOOOOOOOOOOOOO OOO00O0O0O0000O0000 24V dc 24V dc or 120V ac 24V dc Discrete Combination Module 9 OOO00000000000000 OOOOOOOCOOOOOO0000Q0 24V dc 24V dc e OOO0O000000000000 Note All modules powered by the same power supply must be analog modules for this configuration OJ Total current draw through any base unit must not be greater than 10A Pu blication 1794 6 5 7 2 4 How to Install Your Thermocouple mV Input Module Installing the Module Publication 1794 6 5 7 The thermocouple mV module mounts on a 1794 TB2 TB3 or TB3T terminal base unit Important You must use a 1794 TB3T terminal base unit if you are using the thermocouple mV module for thermocouple inputs You can use the 1794 TB2 or TB3 terminal base for mil
21. 2 51 20 97 16 25 60 76 08 500Hz 32 00 57 60 25 60 16 08 19 20 34 56 12 80 23 04 6 400 11 57 o ep o OF 250Hz 1 120 2 016 0 960 I 728 0 800 I440 0 640 L157 0 480 0 864 0 320 0 576 250Hz 8 000 14 40 6 400 11 57 4 800 8 620 3 200 5 760 1 600 2 880 10 100Hz 0 140 0 252 0 120 0 716 0 100 D 180 0 080 VIZA 0 060 0 108 0 040 0 072 0 020 0 036 10 100Hz 1 000 T 800 0 800 1 440 0 600 1 080 0 400 0 720 0 200 0 360 Template revised J une 23 1995 Specifications A 5 Type J Thermocouple 300 150 0 150 30 450 600 750 900 W 1200 508 238 732 202 52 82 m 102 12 7m Temperature C Type K Thermocouple 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 50 TB 32 30 w mn 052 71922 7192 2462 7273 Temperature ut Publication 1794 6 5 7 March 1997 A 6 Specifications A SC Resolution er 500Hz 250Hz 1000Hz 102 4 184 3 76 80 1387 51 20 97 16 25 60 46 08 Resolution 1000Hz 76 80 1382 64 00 1152 51 20 79216 38 40 59 12 25 60 46 08 12 80 23 04 25 60 716 08 19 20 34 56 12 80 23 04 6 40 IL52 500Hz 19 20 31 56 16 00 28 80 12 80 23 04 6 40 I152 4 80 BOF 3 20 370 1 60 10 100Hz 0 80 10 100Hz 60 38 o ul o w re e o d 0 10
22. 2315 C 175 to 800 C You select individual channel ranges using write words 1 and 2 of the block transfer write instruction Scaling lets you report each channel in actual engineering units Scaled values are in integer format Input Type Range Sealing Maximum Resolution TypeB 300 to 1800 C 3000 to 18000 0 19C TyeE 23 9001000 2300 to 10000 0 12C Type J 1950 to 12000 0 19C Tupe K 230 to 13720C 2300 to 13720 0 19 TypeR 50 to 1768 C 500 to 17680 0 19C TypeS 50 to 17682C 500 to 17680 0 19C TypT 195 to 400 C 1950 to 4000 0 19C TyeN 205130 2700 to 13000 0 19 TypeC Oto 2315 C 0 to 23150 0 19C Type L 1750 to 8000 0 19C IpeB T572 to 3272 F 5720 to 32720 0 19F ypE 382 to 1832 F 3820 to 18320 0 19F Type J 319 to 2192 F 3190 to 21920 0 1 TypeK 382 to 2502 F 3820 to 25020 0 19F TypeR 58 to 32149 580 to 32140 0 19F TypeS 58 to 32149 580 to 32140 0 19F TypeT 319 to 7520F 3190 to 7520 0 19F TypeN X 450to 2372 F 4500 to 23720 0 19F Tec wae poon OT Note In thermocouple mode scaled number has an implied decimal point 1 digit from the right For example if reading is 18000 temperature is 1800 0 In millivolt mode the implied decimal point is to the left of the last 2 digits For example if reading is 2250 actual reading is 22 50mV Publication 1794 6 5 7 April 1997 Writing Configuratio
23. 456 907 IB 00 0 50 64 00 1600 4 5120 12 80 320 0 40 38 40 9 60 240 0 30 25 60 6 40 1 60 0 20 12 80 320 0 80 0 10 0 300 150 0 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 508 238 32 302 572 8472 Mmm 1382 1052 1922 2192 2402 2732 3002 32D oC Temperature ar Template revised J une 23 1995 Publication 1794 6 5 7 March 1997 A 4 Specifications Type E Thermocouple OU Resolution p 1000Hz 500Hz 250Hz 10 100Hz 64 00 16 00 4 00 0 50 5120 1280 320 04 9716 2304 576 om 3840 960 240 0 30 25 60 12 80 1 60 0 20 12 80 640 0 80 0 10 0 300 150 0 150 300 450 600 750 900 1050 1200 50 TR RD SR 52 SR Hp Dg 2 21 Temperature x Type C Thermocouple oc Resolution zy 1000Hz 500Hz 250Hz 10 100Hz 32 00 8 0 2 00 0 25 5760 4d JW TAS 25 60 640 1 60 0 20 1920 480 1 20 0 15 3456 BW 710 UI 12 80 320 0 80 0 10 6 400 1 60 0 40 0 05 0 300 0 300 600 900 1200 1500 1800 2100 2400 508 2 7572 ID 1652 32 7302 3812 Temperature Publication 1794 6 5 7 March 1997 Resolution 1000Hz 17 92 3225 15 36 27 65 12 80 73 04 10 24 18 73 7 680 T3 82 5 120 9216 500Hz 4 480 8 064 3 840 5917 3 200 5 760 2 560 7 608 1 920 3 456 1 280 2304 0 640 Ste Resolution 1000Hz 128 0 230 4 102 4 1843 76 80 138
24. 94 TB3 Terminal Base Unit eee Example 3 wire Thermocouple Wiring to a 1794 TB3T Temperature Terminal Base Unit cece eae Module INICIO 354 cea a a E RC Nac ao dcs i CR a E Chapter SUMMAN w w pike wa e i pei kas m reda Chapter 3 Chapter DBISCUUBS kw ta ke aa si sew ass we dp RP EC E ER ba Block Transfer Programming ves ske ka aa eka aaa ken na kenn Sample programs for FLEX I O Analog Modules 05 PLC 3 PIAA asea hd acad oe ar po a pt Ack eo PLC 5 Programming aceite Sp ate a eo orla awe ed PLC 2 PROGRAMMING cc coupe deo a bo UR ay ak n Chapter Summary ire ar acad a xor af a e ens awn dd Publication 1794 6 5 7 ii Table of Contents Writing Configuration to and Reading Status from your Module with a Remote UO Adapter How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter Calibrating Your Module Publication 1794 6 5 7 Chapter 4 Chapter Objectives l l rl ll eee un aa va ka kaa ee Configuring Your Thermocouple mV Module 000ee Range SECON 2225 eduuaue a TABAH sees sey KE eee ke Vy ds ev a canes arin te de at e OS EE are Hardware First Notch Filter aw a aaa da aa a ace RR Ra ann Throughputin Normal Moe Reading Data From Your Module cece eee ees Mapping Data for the Analog Modules ccc e kone e nen Thermocouple mV Input Module 1794 IT8 Image Table Mapping Thermocouple mV Input Module 1794 IT8 Read Therm
25. Publication 1794 6 5 7 April 1997 Template revised J une 23 1995 Appendix A Specifications Specifications 1794 IT8 Thermocouple mV Input Module Number of Inputs 8 Channels Cat No 1794 TB2 TB3 and TB3T Terminal Base Units2 76 5mV Module Location Nominal Input Voltage Ranges Supported Thermocouple Types Type B 300 to 1800 C 572 to 32729F Type C 0 to 23159C 32 to 41999F Type E 230 to 10009C 382 to 18320F Type J 195 to 12009C 319 to 21929F Type K 230 to 1372 C 382 to 25029F Type N 270 to 13009C 450 to 23729F Type R 50 to 17689C 58 to 32149F Type S 50 to 1768 C 58 to 32149F Type T 195 to 4009C 319 to 7529F Type L 175 to 8009C 283 to 14729F Resolution 16 bits 2 384 microvolts typical Accuracy with fixed digital filter 0 025 Full Scale Range 0 5 C at 24 C 0 5 C i Accuracy without fixed digital filter 0 05 Full Scale Range 0 5 C at 24 C 0 5 C 3 Data Format 16 bit 2 s complement or offset binary unipolar Normal Mode Noise Rejection 60db 60Hz Common Mode Rejection 115db 60Hz 100db 50Hz Common Mode Input Range 10V Channel to Channel Isolation 10V System Throughput 325ms 1 channel scanned programmable to 28ms 2 65 8 channels scanned programmable to 224ms Settling Time to 100 of final value Available at system throughput rate Open Circuit Detection Out of range reading upscale Open Thermocouple Detection Time Available at syst
26. UT 1 INPUT 2 INPUT 3 t t t l EINPUT 8 CHANNEL oma Removable Label Ox Keyswitch Position OK INPUT 4 INPUT 5 INPUT 6 INPUT 7 Indicator 3 Input Designators Power On Indicator The thermocouple mV module comes with 2 cold junction compensators These are designed to mount in designated positions on the temperature terminal base unit cat no 1794 TB3T Refer to chapter 2 for installation instructions for the cold junction compensator assemblies In this chapter you learned about the FLEX I O system and the thermocouple module and how they communicate with programmable controllers Publication 1794 6 5 7 Overview of FLEX I O and your Thermocouple mV Module Publication 1794 6 5 7 Chapter 2 How to Install Your Thermocouple mV Input Module In this chapter we tell you how to install your module how to set the module keyswitch how to wire the terminal base about the indicators Before You Install Your Before installing your thermocouple mV module in the I O chassis Input Module You need to As described under Calculate the power requirements of all modules in each chassis Power Requirements page 2 2 Position the keyswitch on the terminal base Installing the Module page 2 4 ATTENTION The Thermocouple module does not receive power from the backplane 24V dc power must be applied to your module before installation If power is not applied the
27. after the program continuously per forms read block transfers The pushbutton allows the user to manually request a block transfer write PLC 5 Programming Module Programming 3 3 The PLC 5 program is very similar to the PLC 3 program with the following exceptions 1 Block transfer enable bits are used instead of done bits as the conditions on each rung 2 Separate block transfer control files are used for the block transfer instructions Figure 3 2 PLC 5 Family Sample Program Structure BTR Enable Bit N12 0 BTW Enable Bit N12 5 Pushbutton 15 Power up Bit N13 10 03 BTR BLOCK TRANSFER READ RACK GROUP MODULE on L CONTROL DATA FILE LENGTH CONTINUOUS BTW BLOCK TRANSFER WRITE EN RACK GROUP MODULE Du CONTROL a ER DATA FILE LENGTH CONTINUOUS Publication 1794 6 5 7 3 4 Module Programming Chapter Summary Publication 1794 6 5 7 PLC 2 Programming The 1794 analog I O modules are not recommended for use with PLC 2 family programmable controllers due to the number of digits needed for high resolution In this chapter you learned how to program your programmable controller You were given sample programs for your PLC 3 and PLC 5 family processors Chapter Objectives Configuring Your Thermocouple mV Module Chapter 4 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter In this chapter we tel
28. and circuitry needed to perform specific functions related to your application FLEX I O thermocouple mV modules are block transfer modules that interface analog signals with any Allen Bradley programmable controllers that have block transfer capability Block transfer programming moves input or output data words between the module s memory and a designated area in the processor data table Block transfer programming also moves configuration words from the processor data table to module memory Publication 1794 6 5 7 1 2 Overview of FLEX I O and your Thermocouple mV Module The adapter power supply transfers data to the module block transfer write and from the module block transfer read using BTW and BTR instructions in your ladder diagram program These instructions let the adapter obtain input or output values and status from the module and let you establish the module s mode of operation The illustration describes the communication process Typical Communication Between an Adapter and a Module The adapter transfers your configuration data to the module using a BTW C External devices transmit Flexbus AB a gt amp Flex IO Allen Bradley Allen Bradley mod mo FTO 2avoc ADAPTER LOCAL POWER SUPPLY ACTIVE FAULT FAULT RIO ADAPTER a a 1794 458 Your ladder program instructs the 5 adapter to perform a BTR ofthe values and sto
29. annel 3 l Channel 4 T Channel 5 l Channel 6 l Channel 7 Channel Selection 1794 IR8 IT8 1 0 Module Calibration Calibration Type C Offset Calibration Gain Calibration Input Data Values Start Calibration Calibration Status Received open response After both offset and gain calibrations are successful click on gee You will be returned to the module configuration screen Either save to the device adapter or save appropriate button to a file by clicking on the 1794 ADN Flex I 0 Configuration Flex 1 0 Adapter Node Address 22 Module Configuration Module Type Configure 16pt 24 Vde Src Output Module gt Slot Z Type Display Name C Catalog No ALLEN BRADLEY DeviceNet Manager Load from File dam fave to File N 170 K ave to Flex 170 Run gt Idle m Outputs To Zero a Run gt Fault Reset Outputs To Zero s Reset ae To Zero Idle gt Fault Outputs Remain in Idle State 19 Remain in Idle State Module Faut Zero Inputs SL Zero Zero inmates H Close Request Sent Publication 1794 6 5 7 April 1997 6 12 Calibrating Your Module If you attempt to close without saving your configuration information by clicking on the Tjara button you will be prompted to save the changes DeviceNet Manager Q Save Configuration to File Before Exiting
30. antan gt Type Thermocouple K Nickel Chromium vs Nickel Aluminum Type Thermocouple R Platinum 1396 Rhodium vs Platinum and S Platinum 1096 Rhodium vs Platinum Type Thermocouples T Copper vs Copper Nickel Constantan Type Thermocouple Publication 1794 6 5 7 iv Table of Contents Publication 1794 6 5 7 Preface Objectives Audience Vocabulary What This Manual Contains Preface Using This Manual Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently We assume that you have previously used an Allen Bradley programmable controller that you are familiar with its features and that you are familiar with the terminology we use If not read the user manual for your processor before reading this manual In addition if you are using this module in a DeviceNet system you must be familiar with e DeviceNetManager Software cat no 1787 MGR Microsoft Windows In this manual we refer to the individual thermocouple mV module as the module e the programmable controller as the controller or the processor The contents of this manual are as follows What s Covered Overview of Flex I O and Your Thermocouple mV Module Describes features capabilities and hardware components How to Install Your A Toni 2 Thermocouple mV Input Module Installation and connecting wiring Block transfer prog
31. ata Values C Offset Calibration Gain Calibration l Channel 1 Start Calibration mo Channel 3 l Channel 4 l Channel 5 Channel 6 l Channel 7 Calibration Status 3 Click on the radio button for gain calibration Then click on Leis 1794 R8 IT8 KO Module Calibration Channel Selection Calibration Type C Offset Calibration Gain Calibration Input Data Values IX Channel 0 Channel 1 T Channel 2 Channel 3 l Channel 4 Channel 5 Channel amp Channel 7 Calibration Status Gain Calibration Successful 4 When calibration is complete a notification will appear on the calibration status line Publication 1794 6 5 7 April 1997 Calibrating Your Module 6 11 The button populates the screen with the actual values appearing at the inputs Note that there is an implied decimal point to the left of the last 2 digits For example channel 0 data value reads 7500 The actual reading is 75 00mV X Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 l Channel 5 Channel amp Channel 7 1794 1R8 IT8 10 Module Calibration Channel Selection Input Data Values 621 623 624 623 623 624 625 Calibration Status Received open response Calibration Tupe e DI E O Gain Calibration EX Channel 0 Ch
32. brate to 1 Bits 08 through 15 in write word 0 4 Send another block transfer write to set the cal clk bit 07 in write word 0 to 1 5 Monitor the cal done bit 09 in read word 10 If the calibration is successful the cal done bit will be set to 1 Verify that the bad cal bit 10 in read word 10 and the cal range bit 08 in read word 10 are not set 0 6 Send another block transfer write to set the cal clk bit 07 in write word 0 to 0 7 Monitor the cal done bit 09 in read word 10 The cal done bit will be reset to 0 8 If the calibration is successful proceed to the gain calibration Publication 1794 6 5 7 April 1997 Calibrating Your Module 6 7 Gain Calibration After completing the offset calibration proceed with the gain calibration 1 2 Apply power to the module for 40 minutes before calibrating Connect 75 000mV across each input channel Connect all high signal terminals together and attach to the positive lead from the precision voltage source Connect all low signal terminals together and attach to the negative lead After the connections stabilize send a block transfer write to the module to set the bit in the calibration mask that corresponds to the channel to be calibrated to 1 and the hi lo bit bit 06 in write word 0 to 1 Set bits 08 through 15 in write word 0 if calibrating all inputs at one time Send another block transfer write to set the cal clk bit 07 in write word
33. bration clock this bit must be set to 1 to prepare for a calibration cycle then reset to 0 to initiate calibration 08 15 10 17 Calibration mask The channel or channels to be calibrated will have the correct mask bit set Bit 8 corresponds to channel 0 bit 9 to channel 1 and so on Publication 1794 6 5 7 April 1997 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter k Word Decimal Bit Octal Bit Write Word 1 00 03 00 03 Bit 02 00 Thermocouple Type Range 04 07 04 07 08 11 10 13 12 15 14 17 Write Word 2 00 03 00 03 04 07 04 07 08 11 10 13 12 15 14 17 Chapter Summary Description Channel 0 on Millivolts default B 300 to 1800 C 230 to 1000 C 195 to 12009C 230 to 13729C 382 to 2502 F E 50 to 17689C 58 to 3214 F C C C C o S 50 to 17682C 58 to 3214 F EN Nu i t T 195to4009C 319 to 7520F Kd EB EN 572 to 3272 F 382 to 18329F 319 to 2192 F oj Oo CO o o fe 0 to 2315 C 32 to 4199 F HL 270 to 13009C 450 to 23720F 1 L 175 to 800 C 283 to 1472 F P Reserved odule reports cold junction temperature for channels 00 03 of odule reports cold junction temperature for channels 04 07 1 I Reserved No sensor connected do not scan ocouple Type see bits 00 03 EMEN LI L T9 LI F 1 Channel 1 The Channel 2 The Channel 3 The C
34. cation ICCG 5 21 August 1995 PN 955107 82 PLEASE FASTEN HERE DO NOT STAPLE Other Comments PLEASE FOLD HERE NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES G Pear gue Rm POSTAGE WILL BE PAID BY THE ADDRESSEE N Rockwell Automation Allen Bradley 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124 9705 LEASE REMOVE P Support Services At Allen Bradley customer service means experienced representatives at Customer Support Centers in key cities throughout the world for sales service and support Our value added services include Technical Support e SupportPlus programs telephone support and 24 hour emergency hotline software and documentation updates technical subscription services Engineering and Field Services application engineering assistance integration and start up assistance field service maintenance support Technical Training e lecture and lab courses e self paced computer and video based training job aids and workstations training needs analysis Repair and Exchange Services your only authorized source current revisions and enhancements worldwide exchange inventory local support ON Rockwell Automation Allen Bradley a Rockwell Automation Business has been helping its customers improve e productivity and quality for more than 90 years We design manufacture and support a broad Allen Bradley range of automati
35. cted Publication 1794 6 5 7 April 1997 Calibrating Your Module 6 3 8 9 10 n 12 13 14 15 SISISISISISISIS CA SISISISISISISISISISIS 1794 TB3 TB3T a Remove the decade box and voltage source b Reconnectthe lead wires to the input terminals for this channel Thermocouple ah or Repeat this procedure for the remaining channels Sensor Manually Calibrating your You must calibrate the module in a FLEX I O system The module Thermocouple mV Input must communicate with the processor and a programming terminal Module You can calibrate input channels in any order or all at once Before calibrating your module you must enter ladder logic into the processor memory so that you can initiate BTWs to the module and read inputs from the module Important In order to allow the internal module temperature to stabilize energize the module for at least 40 minutes before calibrating Module calibration consists of Applying a reference to the desired input s e Sending a message to the module indicating which inputs to read and what calibration step is being performed offset The module stores this input data Applying a second reference signal to the module and sending a second message indicating which inputs to read and what calibration step is being performed gain The module computes new calibration values for the inputs Once the calibration is complete the module reports back status informa
36. e step input in 60 times the selected first notch filter time shown on page 4 3 Default filter disabled 03 05 03 05 A D Filter First Notch Frequency Bit 05 0 03 Definition 0 0 10Hz default v prse rv ee 0 0 100Hz ESES 250Hz ESE 500Hz 1000hZ 06 06 Calibration High Low bit This bit is set during gain calibration reset during offset calibration KA l e mi e Oo oO ojl o 07 07 Calibration clock this bit must be set to 1 to prepare for a calibration cycle then reset to 0 to initiate calibration 08 15 10 17 Calibration mask The channel or channels to be calibrated will have the correct mask bit set Bit 8 corresponds to channel 0 bit 9 to channel 1 and so on Publication 1794 6 5 7 April 1997 5 6 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter Decimal Bit TA oro Octal Bit Description Write Word 2 00 03 00 03 Channel 0 Thermocouple Type Millivolts default B 300 to 1800 C E 230 to 1000 C J 195 to 1200 C 572 to 32720F 382 to 1832 F 319 to 2192 F 382 to 2502 F 0 0 1 E 1 E 58 to 3214 F 0 1 0 1 el O oO O 0 0 K 230 to 1372 C fa fa fa fa pofipfojf m 50 to 1768 C 58 to 32149F po fi fad ft 195 to 400 C 319 to 752 F 32 to 41999F 450 to 2372 F 283 to 14729F Fi o o jo C Oto 2315 C Fi oo fo ft N 270 to 13009C Pi popipf L
37. ecified for the Type K thermocouples below OC Type K thermocouples can also be supplied to meet special limits of error which are equal to one half the standard limits of error given above The recommended upper temperature limit for protected Type K thermocouples 1260C applies for AWG 8 3 3mm wire For smaller wires it decreases to 1093C for AWG 14 1 6mm 982C for AWG 20 0 8mm and 871C for AWG 24 or 28 0 5 or 0 3mm Thermocouple Restrictions B 5 R Platinum 13 Rhodium vs Platinum and S Platinum 10 Rhodium vs Platinum Type Thermocouples The ASTM manual STP 470 1970 indicates the following restrictions on the use of S and R type thermocouples at high temperatures They should not be used in reducing atmospheres nor in those containing metallic vapor such as lead or zinc nonmetallic vapors such as arsenic phosphorous or sulfur or easily reduced oxides unless suitably protected with nonmetallic protecting tubes They should never be inserted directly into a metallic primary tube The positive thermoelement platinum 10 rhodium 13 rhodium for R is unstable in a thermal neutron flux because the rhodium converts to palladium The negative thermoelement pure platinum is relatively stable to neutron transmutation However fast neutron bombardment will cause physical damage which will change the thermoelectric voltage unless it is annealed out The thermoelectric voltages of platinum based ther
38. em throughput rate Overvoltage Capability 35V dc 25V ac continuous 25 C 250V peak transient Channel Bandwidth 0 to 2 62Hz 3db default RFI Immunity Error of less than 1 of range at 10V M 27 to 1000MHz Input Offset Drift with Temperature 6 microvolts C maximum Gain Drift with Temperature 10ppm C maximum Overall Drift with Temperature 50ppm C of span maximum Cold J unction Compensation Range 0 to 70 C Cold J unction Compensator A B Part Number 969424 01 Indicators 1 red green power status indicator Flexbus Current 20mA Power Dissipation 3W maximum 31 2V dc Specifications continued on next page Publication 1794 6 5 7 March 1997 A 2 Specifications Specifications 1794 IT8 Thermocouple mV Input Module Thermal Dissipation Maximum 10 2 BTU hr 31 2V dc Keyswitch Position 3 General Specifications External dc Power Supply Voltage 24V dc nominal Voltage Range 19 2 to 31 2V dc includes 5 ac ripple 19 2V dc for ambient temperatures less than 55 C 24V dc for ambient temperatures less than 55 C 31 2V dc for ambient temperatures less than 40 C See derating curve Supply Current 150mA Q 24V dc Cabling Thermocouples inputs Appropriate shielded thermocouple extension wire Millivolt inputs Belden 8761 Dimensions Inches 1 8H x 3 7W x 2 1D Millimeters 45 7 x 94 0 x 53 3 Environmental Conditions Operational Temperature 0 to 55 C 32 to 131 F See derating curve Storage Temperature 40 to 859C 40
39. er of the installed I O modules The Output data for Slot 0 is received first followed by the Output data for Slot 1 and so on up to slot 7 The first word of input data sent by the adapter is the Adapter Status Word This is followed by the input data from each slot in the order of the installed I O modules The Input data from Slot 0 is first after the status word followed by Input data from Slot 2 and so on up to slot 7 DeviceNet Adapter Read Data Adapter Status Slot 0 Input Data Network READ Slot 1 Input Data Slot 7 Input Data aa Ladies gt Write i Slot 7 Slot 0 Output Data Slot 1 Output Data Slot 7 Output Data Publication 1794 6 5 7 April 1997 5 2 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter Adapter Input Status Word The input status word consists of e O module fault bits 1 status bit for each slot e node address changed 1 bit e O status 1 bit 1 0 Module Fault Bits Bit 15 10 through 15 9 8 7853532139 N Lal o ees Belee I O State Bit Node Address Changed Bit The adapter input status word bit descriptions are shown in the following table Bit Description Explanation This bit is set 1 whe 0 This bit is set 1 1 This bitis set 1 when an error is detected in slot position 3 This bit is set 1 4 This bit is set 1 5 h 1 6 h 1 3 an error is detected in slot position 0 when an error is de
40. etter control calibration results Change Bars The areas in this manual which are different from previous editions are marked with change bars as shown to the right of this paragraph to indicate the addition of new or revised information Publication 1794 6 5 7 April 1997 soc ii Summary of Changes Publication 1794 6 5 7 April 1997 Table of Contents Overview of Flex I O and your Thermocouple mV Module How to Install Your Thermocouple mV Input Module Module Programming Chapter 1 Chapter Objectives Ludus ab e m tete hd aka ga e di The FLEX WO S VEU ca dpi dto ao bue VOIR p vu o d How FLEX I O Analog Modules Communicate with Programmable Controle nc rori dr es eee a tn a dnt A aed A a 8 Typical Communication Between an Adapter and a Module Features of your Modules ccc cece eee ken aa kenn ChapierSUMMG vs konin a ab a KR ae ak eman vada ts Chapter 2 pa A ap a a e a ak a ak ap n A DEANE ab RTA 2 1 Before You Install Your Input Module 00 eee 2 1 European Union Directive Compliance 0 eee eee 2 1 EMC Directive Losses ganda a a AA ape kep ta A e ae ws 2 1 Low Voltage Directive i vv ea eee aa ke aa nnn Power Requirements cece aa aka aa ken aaa eat aa kenn Wiring the Terminal Base Units 1794 TB2 and TB3 shown Installing the Module n n Connecting Wiring for the Thermocouple mV Module Example of Millivolt Input Wiring to a 17
41. following restrictions at high temperatures They should not be used in sulfurous reducing or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes They should not be used in vacuum at high temperatures for extended times because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration They should also not be used in atmospheres that promote green rot corrosion those with low but not negligible oxygen content 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 ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for the Type E commercial thermocouples be 1 7C between 0 and 316C and 1 2 percent between 316 and 871C Limits of error are not specified for Type E thermocouples below OC Type E thermocouples can also be supplied to meet special limits of error which are less than the standard limits of error given above 1 25C between 0 and 316C and 3 8 percent between 316 and 871C The recommended upper temperature limit for protected thermocouples 871C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decreases to 649C for AWG 14 1 6mm 538C for AWG 20 8mm and 427C for AWG 24 or 28 0 5 or 0 3mm J Iron vs Coppe
42. hannel 4 The Channel 5 The Channel 6 The Channel 7 The D 3 D 3 ocouple Type see bits 00 03 D 3 ocouple Type see bits 00 03 ocouple Type see write word 1 bits 00 03 D 3 D 3 ocouple Q 3 ocouple Type see write word 1 bits 00 03 ype see write word 1 bits 00 03 fp 3 ocouple Type see write word 1 bits 00 03 In this chapter you learned how to configure your module s features and enter your data Publication 1794 6 5 7 April 1997 4 8 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter Publication 1794 6 5 7 April 1997 Chapter Objectives About DeviceNet Manager Polled I O Structure Chapter 5 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter In this chapter we tell you about e DeviceNetManager software e I O structure e image table mapping e factory defaults DeviceNetManager software is a software tool used to configure your Flex I O DeviceNet adapter and its related modules This software tool can be connected to the adapter via the DeviceNet network You must know and understand how DeviceNet Manager works in order to add a device to the network Refer to the DeviceNetManager Software User Manual publication 1787 6 5 3 and the DeviceNet Adapter Module User Manual publication 1794 6 5 5 Output data is received by the adapter in the ord
43. l 16 on the B row Important To reduce susceptibility to noise power analog modules and discrete modules from separate power supplies ATTENTION Do not daisy chain power or ground from the thermocouple terminal base unit to any ac or dc discrete module terminal base unit Publication 1794 6 5 7 2 6 How to Install Your Thermocouple mV Input Module ATTENTION The Thermocouple mV module does not receive power from the backplane 24V dc power must be applied to your module before installation If power is not applied the module position will appear to the adapter as an empty slot in your chassis 4 On 1794 TB3T terminal base units Connect the cold junction compensation CJC wiring to terminals 36 37 and 38 for inputs 0 through 3 and terminals 47 48 and 49 for inputs 4 through 7 Connect the tail of the cold junction compensator to any of the associated thermocouple input terminals 0 through 7 for CJC connected to 36 37 and 38 or 8 through 15 for CJC connected to 47 48 and 49 The tail of the cold junction compensator shares a terminal with an input 5 If daisy chaining the 24V dc power to the next base unit Cold Junction Compensator connect a jumper from terminal 51 on this base unit to terminal PENO 96342401 34 on the next base unit 0 1 2 3 4 5 6 7 8 9 10 11 12 131 15 1794 TB2 6 7 8 9101 12 13 M 15 JSISISISISISISISISSISI SJSISISISISISISISISISISTS 1794 TB3 TB3T
44. l you about e configuring your module s features e entering your data e reading data from your module e the read block format Because of the wide variety of possible configurations you must configure your module to conform to the specific application that you have chosen The module is configured using a group of data table words that are transferred to the module using a block transfer write instruction The software configurable features available for the thermocouple module are input output range selection including full range and bipolar selectable first notch filter e data reported in F C unipolar or bipolar count Note PLC 5 family programmable controllers that use 6200 software version 5 2 or later programming tools can take advantage of the IOCONFIG utility to configure these modules IOCONFIG uses menu based screens for configuration without having to set individual bits in particular locations Refer to your 6200 software literature for details Publication 1794 6 5 7 April 1997 4 2 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter Range Selection Input Scaling Individual input channels are configurable to operate with the following sensor types Sensor Type Range Voltage 76 50 to 76 50mV Thermocouple 300 to 1800 C 230 to 1000 C 195 to 1200 C 230 to 1372 C 50 to 1768 C 50 to 1768 C 195 to 400 C 270 to 1300 C Type C 0 to
45. livolt inputs only 1 Rotate the keyswitch 1 on the terminal base unit 2 clockwise to position 3 as required for the thermocouple mV module 2 Make certain the flexbus connector 3 is pushed all the way to the left to connect with the neighboring terminal base adapter You cannot install the module unless the connector is fully extended ATTENTION Remove field side power before removing or inserting the module This module is designed so you can remove and insert it under backplane power When you remove or insert a module with field side 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 Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector Worn contacts may create electrical resistance 3 Before installing the module check to make sure that the pins on the bottom of the module are straight so they will align properly with the female connector in the base unit 4 Position the module 4 with its alignment bar 5 aligned with the groove 6 on the terminal base 5 Press firmly and evenly to seat the module in the terminal base unit The module is seated when the latching mechanism 7 is locked into the module 6 Repeat the above steps to install the next m
46. livolt inputs only SREEESSESSRSSSSVE PERE RRES OOO SISIeISISISISISISISISISISISISISISIS Precision Voltage Source Ez 1794 TB3T Note 2 CJ C not required if using thermocouple for resistance only Wiring Connections for the Thermocouple Module 1794 TB2 TB3 Terminal Base Units 1794 TB3T Terminal Base Unit Thermocouple Channel High Signal Shield Terminal 4 Return 0 0 39 1 2 40 2 4 41 3 6 42 Ln m o a C N mm ce mn E A 8 2 13 29 12 13 45 01 on 15 31 14 15 46 1 Terminals 39 to 46 are chassis ground Terminals 36 37 38 and 47 48 49 are cold junction compensator connections Publication 1794 6 5 7 April 1997 6 6 Calibrating Your Module Read Write Words for Calibration Dec Bit Octal Bit Pwr Bad Write Word 0 8 Bit Calibration Mask e ji Filter Cutoff Data Type Offset Calibration Inputs can be calibrated one at a time or all at once To calibrate the offsets for all inputs at once proceed as follows 1 Apply power to the module for 40 minutes before calibrating 2 Connect 0 000V across each input channel Connect all high signal terminals together and attach to the positive lead from the precision voltage source Connect all low signal terminals together and attach to the negative lead 3 After the connections stabilize use a block transfer write to set the bit s in the calibration mask that correspond to the channel s you want to cali
47. ments since Type TP thermoelements oxidize rapidly above this temperature However the thermoelectric properties of Type TP thermoelements are apparently not grossly affected by oxidation since Roeser and Dahl 1938 observed negligible changes in the thermoelectric voltage of Nos 12 18 and 22 AWG Type TP thermoelements after heating for 30 hours in air at 500C At this temperature the Type TN thermoelements have good resistance to oxidation and exhibit only small changes in thermal emf with long exposure in air as shown by the studies of Dahl 1941 Operation of Type T thermocouples in hydrogen atmospheres at temperatures above about 370C is not recommended since severe embrittlement of the Type TP thermoelements may occur Type T thermoelements 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 thermoelement is converted to nickel and zinc Because of the high thermal conductivity of Type TP thermoelements special care should be exercised in the use of the thermocouples to insure that both the measuring and reference junctions assume the desired temperatures ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type T commercial thermocouples be 2 percent between 101 and 59C 8C between 59 and 93C and 3 4 percent
48. mocouples are sensitive to their heat treatments In particular quenching from high temperatures should be avoided ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type S and R commercial thermocouples be 1 4C between 0 and 538C and 1 4 between 538 and 1482C Limits of error are not specified for Type S or R thermocouples below OC The recommended upper temperature limit for continuous use of protected thermocouples 1482C applies to AWG 24 0 5mm wire T Copper vs Copper Nickel lt Constantan gt Type Thermocouple The homogeneity of most Type TP and TN or EN thermoelements is reasonably good However the Seebeck coefficient of Type T thermocouples is moderately small at subzero temperatures about 5 6uV K at 20K being roughly two thirds that of Type E thermocouples This together with the high thermal conductivity of Type TP thermoelements is the major reason why Type T thermocouples are less suitable for use in the subzero range than Type E thermocouples Publication 1794 6 5 7 B 6 Thermocouple Restrictions Publication 1794 6 5 7 Type T thermocouples are recommended by the ASTM 1970 for use in the temperature range from 184 to 371C in vacuum or in oxidizing reducing or inert atmospheres The recommended upper temperature limit for continuous service of protected Type T thermocouples is set at 371C for AWG 14 1 6mm thermoele
49. mocouples are taken to high temperatures especially above 900C they will lose accuracy of their calibration when they are recycled to lower temperatures ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type J commercial thermocouples be 2 2C between 0 and 277C and 3 4 percent between 277 and 760C Limits of error are not specified for Type J thermocouples below OC or above 760C Type J thermocouples can also be supplied to meet special limits of error which are equal to one half the limits given above The recommended upper temperature limit for protected thermocouples 760C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decrease to 593C for AWG 14 1 6mm and 371C for AWG 24 or 28 0 5 or 0 3mm t should be noted that the Constantan element of Type thermoelements is NOT interchangeable with the Constantan element of Types T or N due to the different ratio of copper and nickel in each Publication 1794 6 5 7 B 4 Thermocouple Restrictions Publication 1794 6 5 7 K Nickel Chromium vs Nickel Aluminum Type Thermocouple This type is more resistant to oxidation at elevated temperatures than the Types E J or T thermocouples and consequently it finds wide application at temperatures above 500C Type K thermocouples may be used at liquid hydrogen temperatures However their Seebeck coefficient about 4uV K
50. module position will appear to the adapter as an empty slot in your chassis European Union Directive If this product has the CE mark it is approved for installation within Compliance the European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive This product 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 e EN 50081 2EMC Generic Emission Standard Part 2 Industrial Environment e EN 50082 2EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment Publication 1794 6 5 7 2 2 How to Install Your Thermocouple mV Input Module Power Requirements Publication 1794 6 5 7 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 EN 61131 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 Guidelines for Handling Lithium Batteries publication AG 5 4 Automation Systems Catalog publication B111 The wiring of the terminal base
51. mulator Calibrator A and Calibration source Model 1120 dud an Industrial Terminal and Programming terminal for A B family processors Interconnect Cable Removing Lead Wire or The thermocouple mV module has open circuit detection This is Thermocouple Extension accomplished by a 1LLA current source in the module This current Wire Resistance flowing through the lead wire or thermocouple extension wire generates an error or offset voltage in the reading Use the Error Due to Open Circuit Current Through Loop Resistance in appendix A to determine if the magnitude of the error is acceptable Calibrate this error out as follows 5 5 5 5 0 15 A 16 33 B SISSE EISE IIS 34 51 C 1794 TB3 TB3T a Disconnect the lead wires at the terminal base unit b Measure total loop resistance of both lead extension wires and thermocouple c Ifusing a sensor other than a thermocouple disconnect the lead wires at the sensor and tie together for this measurement Reconnect after measurement Thermocouple or d After measuring remove ohmmeter Sencor B 5 5 5 5 0 15 A Oo EU ur m gt a Setdecade box to value determined in step 1 and connect in series with a preci sion voltage source b Connect to the input terminals of the particular channel you are calibrating Thermocouple or Voltage Source c Perform an offset and gain calibration as outlined later in this chapter Sensor Disconne
52. n that the thermocouple mV module is installed and powered before or simultaneously with the remote I O adapter If the adapter does not establish communication with the module cycle power to the adapter The following sample programs are minimum programs all rungs and conditioning must be included in your application program You can disable BTRs or add interlocks to prevent writes if desired Do not eliminate any storage bits or interlocks included in the sample programs If interlocks are removed the program may not work properly Your program should monitor status bits and block transfer read activity Publication 1794 6 5 7 3 2 Module Programming Sample programs for FLEX I O Analog Modules Program Action At power up in RUN mode or when the processor is switched from PROG to RUN the user program enables a block transfer read Then it initiates a block transfer write to configure the module Thereafter the program continuously performs read block transfers Note You must create the data file for the block transfers before you enter the block transfer instructions The pushbutton allows the user to manually request a block transfer write Publication 1794 6 5 7 1 The following sample programs show you how to use your analog module efficiently when operating with a programmable controller These programs show you how to e configure the module e read data from the module These example prog
53. n to and Reading Status from your Module with a Remote I O Adapter 4 3 You select input scaling using the designated words of the write block transfer instruction Refer to the Bit Word description for write word 0 bits 00 and 01 Hardware First Notch Filter A hardware filter in the analog to digital converter lets you select a frequency for the first notch of the filter Selection of the filter influences the analog to digital output data rate and changes the module throughput Module throughput is a function of the number of inputs used and the first notch filter Both of these influence the time from a thermocouple input to arrival at the backplane Throughput in Normal Mode A D Filter First Notch Frequency effective resolution 60Hz 100Hz 250Hz 500Hz 1000Hz 10Hz 50Hz 16 bits 16 bits 16 bits 13 bits 11 bits 9 bits 16 bits 25Hz 16 bits Number of channels End System Throughput in ms and s 1 2 3 4 5 1 625s 6 1 95s 870 510 450 330 222 186 168 7 2 2155 1 0155 595 525 385 259 217 196 8 2 6051 1 16s 680 600 440 296 248 224 1 Default setting Publication 1794 6 5 7 April 1997 4 4 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter Reading Data From Your Read programming moves status and data from the thermocouple Module input module to the processor s data table The processor s user program initiates the request to
54. ng wiring 2 4 6 4 considerations pre installation 2 1 curent draw through base units 2 2 curve derating A d supply voltage vs ambient temperature curves resolution D daisy chaining wiring 2 4 default values 5 7 derating curve A 4 DeviceNetManager software 5 1 DeviceNetManager software 6 d E example thermocouple 1794 TB3 2 7 thermocouple 1794 TB3T 2 7 F features of the module 1 3 first notch filter 4 3 flow chart calibration 6 4 G gain calibration 6 4 using DeviceN etManager 6 1 l 1 0 module faut 5 4 indicators states status input ranges 4 4 input scaling 4 2 input status word 5 4 installation module 2 4 Publication 1794 6 5 7 Index Publication 1794 6 5 7 K keyswitch positions 2 4 M manual calibration 6 4 mapping 1794 IT8 4 4 5 4 module shipping state 6 1 module fault 5 2 module features 1 3 module installation 2 4 0 offset calibration 6 1 using DeviceNetManager 6 9 open circuit error A d optimal defaults 5 7 P PLC 2 programming 3 4 polled I O structure 5 1 power defaults 5 7 preparing for calibration 6 4 programming example PLC 3 3 2 PLC 5 3 3 R range selecting 4 2 read write words for calibration 6 1 removing and replacing under power RIUP repeatability worst case A d resolution curves type B thermocouple type C thermocouple type E thermocouple A 3 type J thermocouple ty
55. noon Offset Calibration pa a die den kak Gain Calibration saaa aaa aaa Rn aw ki an aa po RR 5 1 Table of Contents iii Calibrating Your Thermocouple mV Module using DeviceNetM anager Software Cat No 1787 MGR cece eee eee eee 6 9 CE EE ANN CENE ET EET TE CETT CETT T OTT 6 9 Gaim a IBI as sii asa dod c4 dde e ol o Qoa ai ai elas 4 6 1 Specifications Appendix A SDESCUICAUUMS Soha date kk d VC Kor hates EC Fa ad Derating CUVE rw Resolution Curves for Thermocouples aaa Type B Thermocouple est ee eee ae ana aa eee nn Type E Thermocouple ais ava kaw andi caw ie yr nha Type C Thermocouple 2 ba cria id nO be E Ele sap oe Type J Thermocouple x osea der d e cc ade hs Type K Therm tO ple ou baeo d aR e a OR tenas Type R Thermocouple 1 caza deb o e RR Peewee ad Type S ThERDCOUMIG 2c ues dd wow tores ul e os Type T Thermocouple 12 ad ouo E eo Rb ERE RR Type N Thermocouple ccc cece aaa kak n Worst Case Accuracy for the Thermocouple mV Module Error Due to Open Circuit Current Through Loop Resistance Worst Case Repeatability for the Thermocouple mV Input Module Thermocouple Restrictions Appendix B Extracted from NBS Benet NE B 1 Monograph 125 IPTS 68 B Platinum 30 Rhodium vs Platinum 6 Rhodium Type Thermocouples e kr ye B 1 E Nickel Chromium vs Copper Nickel lt Constantan gt Type Thermocouple 122 xx oae x rna RE E A E ERA J Iron vs Copper Nickel lt Const
56. ocouple mV Input Module 1794 IT8 Write Word Bit Descriptions for the 1794 IT8 Thermocouple mV Input Mod le ion coa DER GERE ERR op POE ed Chapter Summa kt gge an ai e 5 a a Chapter 5 Chapter Objectives 4 kew aaa aa m kw Ra a ER m da About DeviceNet Manager isses Poll d lO Suee sicie crprePReriretueiru w erna Adapter Input Status Word ccc cece aa ke ka aa kk enan System TRIDUODDUE i i ye kode ds ra tro de xe y race deeds s Mapping Data into the Image Table ccc cece eee Thermocouple mV Input Module 1794 IT8 Image Table Mapping Thermocouple mV Input Module 1794 IT8 Read Thermocouple mV Input Module 1794 IT8 Write Word Bit Descriptions for the 1794 IT8 Thermocouple mV Input Module us koze ERE DK edad dea bird eid Deui Ta Pirates VEU ERR WOO a AR ae RON waned ROC a Chapter 6 Chapter ODISEUME sures epusdes R mbi bu eae doce General IMOMGMON s ci acea A OUR T Z TE FRI dep Ya OR Qa ond TOOK and E DW MENN svr cu o a do gcc ea Removing Lead Wire or Thermocouple Extension Wire Resistance Method Losses sexe tesa ER oa ead wame es aw RR Method ia m ek a a WEREG AR YA ka a A aa fakt Manually Calibrating your Thermocouple mV Input Module Flow Chart for Calibration Procedure ccc e eee kannan Calibration Setups e kw dieses ds ka dow kase Ge ee en Wiring Connections for the Thermocouple Module Read Write Words for Calibration erer ee
57. odule in its terminal base unit How to Install Your Thermocouple mV Input Module 2 5 Connecting Wiring for the Thermocouple mV module wiring is made through the terminal base Thermocouple mV Module unit on which the module mounts The module comes with 2 cold junction compensators for use when using the thermocouple module in the thermocouple mode Compatible terminal base unit are Module 1794 TB2 1794 TB3 1794 TB3T 1 The 1794 TB3T terminal base unit contains connections for cold junction compensation for use with thermocouple modules 2 For millivolt inputs only 1794 TB2 and 1794 TB3 1794 TB3T Where V 2 24V dc V 24V dc These terminals on 1794 TB3 only C 24V dc commo n COM 24V dc common CJ C cold junction compensation N additional input chassis ground Connecting Wiring using a 1794 TB2 TB3 and TB3T Terminal Base Units 1 Connect the individual signal wiring to numbered terminals on the 0 15 row A on the terminal base unit Connect the high side to the even numbered terminals and the low side to the odd numbered terminals See Table 2 A 2 Connect shield return to the associated terminal on row B as shown in Table 2 A On 1794 TB2 and TB3 bases only terminate shields to the associated shield return terminals on row B On 1794 TB3T bases only terminate shields to terminals 39 to 46 on row C 3 Connect 24V dc to terminal 34 on the 34 51 row C and 24V common to termina
58. on products worldwide They include logic processors power and motion control devices operator interfaces sensors and a variety of software Rockwell is one of the world s leading technology companies Worldwide representation n es Argentina e Australia e Austria e Bahrain e Belgium e Brazil e Bulgaria e Canada e Chile e China PRC e Colombia e Costa Rica e Croatia e Cyprus e Czech Republic e Denmark e Ecuador e Egypt e El Salvador e Finland e France e Germany e Greece e Guatemala e Honduras e Hong Kong e Hungary s Iceland e India e Indonesia e Ireland e Israel e Italy e Jamaica eJ apan eJ ordan e Korea e Kuwait e Lebanon e Malaysia e Mexico e Netherlands e New Zealand e Norway e Pakistan e Peru e Philippines e Poland e Portugal e Puerto Rico e Qatar e Romania e Russia CIS e Saudi Arabia e Singapore e Slovakia e Slovenia e South Africa Republic e Spain e Sweden e Switzerland e Taiwan e Thailand e Turkey e United Arab Emirates e United Kingdom e United States e Uruguay e Venezuela e Yugoslavia Allen Bradley Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 1794 6 5 7 April 1997 PN955128 56 Supersedes publication 1794 6 5 7 March 1996 Copyright 1997 Allen Bradley Company Inc Printed in USA
59. own as long as it is between 0 and 50C Studies have shown that a 0 1 percent change in the Rhodium content of the Pt 30 Rh thermoelement produces a corresponding change in the thermocouple voltage of about 15uV i e 1 3C at 1500C In contrast a change of only 01 in the Rhodium content of Pt 6 Rh thermoelement also produces a voltage change of about 15uV 1 3C at this temperature The thermoelectric voltages of Type B thermocouples is sensitive to their history of annealing heat treatment and quenching Calibration of Type B wires above 1600C is undesirable in most circumstances ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type B commercial thermocouples be 1 2 percent between 871 and 1705C Limits of error are not specified for Type B thermocouples below 871C The recommended upper temperature limit for protected thermocouples 1705C applies to AWG 24 0 5mm wire Publication 1794 6 5 7 B 2 Thermocouple Restrictions Publication 1794 6 5 7 E Nickel Chromium vs Copper Nickel lt Constantan gt Type Thermocouple Type E thermocouples are recommended by the ASTM Manual 1970 for use in the temperature range from 250 to 871C in oxidizing or inert atmospheres The negative thermoelement is subject to deterioration above about 871C but the thermocouple may be used up to 1000C for short periods The ASTM Manual 1970 indicates the
60. pe K thermocouple type N thermocouple A 4 type R thermocouple type S thermocouple type T thermocouple S sample program 3 4 scaling 4 4 software DeviceNetManager 5 1 specifications thermocouple A 1 status indicators 2 9 system throughput 5 3 T terminal bases compatible 2 3 thermocouple input mapping 1794 IT8 thermocouple 1794 TB3T example 2 throughput normal mode 4 3 W wiring connections 6 4 methods of 2 3 to terminal bases 2 1 wiring connections 1794 1T8 2 4 6 4 wy Allen Bradley Publication Problem Report If you find a problem with our documentation please complete and return this form Pub Name B Input Thermocouple mV User Manual Check Problem s Type Describe Problem s Internal Use Only C Technical Accuracy C text C illustration Completeness procedure step illustration definition info in manual What information is missing example guideline feature accessibility C explanation other 7 info not in manual Clarity What is unclear Sequence What is not in the right order L Other Comments Use back for more comments Your Name Location P hone Return to Marketing Communications Allen Bradley Co 1 Allen Bradley Drive Mayfield Hts OH 44124 6118 Phone 216 646 3176 216 646 4320 Publi
61. r Nickel lt Constantan gt Type Thermocouple The J thermocouple is the least suitable for accurate thermometry because there are significant nonlinear deviations in the thermoelectric output from different manufacturers The total and specific types of impurities that occur in commercial iron change with time location of primary ores and methods of smelting Thermocouple Restrictions B 3 Type J thermocouples are recommended by the ASTM 1970 for use in the temperature range from 0 to 760C in vacuum oxidizing reducing or inert atmospheres If used for extended times above 500C heavy gage wires are recommended because the oxidation rate is rapid at elevated temperatures They should not be used in sulfurous atmospheres above 500C Because of potential rusting and embrittlement they are not recommended for subzero temperatures They should not be cycled above 760C even for a short time if accurate readings below 760C are desired at a later time The negative thermoelement a copper nickel alloy is subject to substantial composition changes under thermal neutron irradiation since copper is converted to nickel and zinc Commercial iron undergoes a magnetic transformation near 769C and an alpha gamma crystal transformation near 910C Both of these transformations especially the latter seriously affect the thermoelectric properties of iron and therefore the Type J thermocouples If Type J ther
62. ramming and programming examples Module P rogramming Writing Configuration to and Reading Describes block transfer write and block transfer read 4 Status from Your Module with a configurations including complete bit word descriptions Remote I O Adapter How Communication Takes Place Describes communication over the I O backplane 5 and I O Image Table Mapping with between the module and the adapter and how data is the DeviceNet Adapter mapped into the image table Lists the tools needed and the methods used to calibrate the thermocouple input module Calibrating Your Module Appendix Module specifications derating curve resolution curves A Specifications for thermocouples worst case accuracy and error due to open circuit current B Thermocouple Restrictions Extracted from NBS Monograph 125 IPTS 68 Publication 1794 6 5 7 April 1997 P 2 Using This Manual Conventions For Additional Information Summary Publication 1794 6 5 7 April 1997 Catalog Number E mi Publications Description Installation User Instructions 1787 MGR 1794 1794 ADN 1794 AS B C We use these conventions in this manual In this manual we show Like this that there is more information about a topic in another chapter in this manual that there is more information about the topic in another manual For additional information on FLEX I O systems and modules refer to the following documents
63. rams illustrate the minimum programming required for communication to take place PLC 3 Programming Block transfer instructions with the PLC 3 processor use one binary file in a data table section for module location and other related data This is the block transfer control file The block transfer data file stores data that you want transferred to your module when programming a block transfer write or from your module when programming a block transfer read The address of the block transfer data files are stored in the block transfer control file The same block transfer control file is used for both the read and write instructions for your module A different block transfer control file is required for every module A sample program segment with block transfer instructions is shown in Figure 3 1 and described below Figure 3 1 PLC 3 Family Sample Program Structure BTR Enable Block Transfer BLOCK XFER READ EN Read Done Bit RACK E B3 0 GROUP Done y MODULE DN CONTROL 15 15 DATA FILE Error LENGTH ER LT 13 Block Transfer Write Done Bit Pushbutton BTW Enable B3 0 BLOCK XFER WRITE EN 4 RACK 02 05 GROUP Done MODULE DN Power up Bit CONTROL 05 B4 10 ie Error l ER 03 03 Program Action At power up in RUN mode or when the processor is switched from PROG to RUN the user program enables a block transfer read Then it initiates a block transfer write to configure the module There
64. res them in a data table Eu The adapter and module determine thatthe transfer was made without error and input values are within specified range Q Your ladder program can use and or move the data if valid before it is written over by the transfer of new data in a subsequent transfer PIE 5 Your ladder program performs BTWs to the module only when Bm 700000000 0 INPUT 5 CHANNEL aaa O aa PS NS EE PT UE sec UNA INPUT OINPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 OX U o te t t 42 4 4 WJ OOOOOOOOOOOOOO00 OOO00000000000000 OOOOOOOOOOOOOOOOO EL PEN their transfer you power it up or any time you wish to reconfigure the module Publication 1794 6 5 7 The module converts analog signals into binary format and stores these values until the adapter requests analog signals to the module Features of your Modules Chapter Summary Overview of FLEX I O and your Thermocouple mV Module 1 3 The module label identifies the keyswitch position wiring and module type A removable label provides space for writing individual designations per your application 1794 IT8 Module Type i Flex lO Allen Bradley 1794 178 THERMOCOU INPUT 0 INP
65. rrange Bits Bad Cal Cal Pwr Bad CJC CJC Thermocouple mV Input Module 1794 IT8 Write Dec Bit 15 1M 13 12 11 09 08 07 06 05 o 03 02 ot 00 Octal Bit 17 16 15 14 13 11 10 07 06 05 o 03 02 an 00 Write Word 1 8 Bit Calibration Mask m S A Filter Cutoff FDF Data Type Write Word 2 Thermocouple 3 Type Thermocouple 2 Type Thermocouple 1 Type Thermocouple 0 Type Write Word 3 Thermocouple 7 Type Thermocouple 6 Type Thermocouple 5 Type Thermocouple 4 Type Where FDF fixed digital filter bit Word Bit Descriptions for the 1794 IT8 Thermocouple mV Input Module Decimal Bit ER wis Octal Bit Description Read Word 1 00 15 00 17 Reserved ReadWord2 00 15 00 17 Channel 0 Inputdata 0000000000000000 Read Word3 00 15 00 17 Chamelliputdata n Read Word 4 00 15 00 17 Channel 2 Inputdata n ReadWord5 00 15 00 17 Chamnel 3 Inputdata 00000000000000 ReadWord6 00 15 00 17 Channel 4 Inputdata n ReadWord7 00 15 00 17 Chamnel5 Inputdata 0000000000000 RexWod8 00 15 00 17 Chamnel6 Inputdata 000000000000000 Read Word 9 00 15 00 17 Channel 7 Input data Read Word 10 00 07 00 07 Underrange bits these bits are set if the input signal is below the input channel s minimum range 08 15 10 17 Overrange bits these bits are set if 1 the input signal is above the input channel s maximum range or 2 an open detector is
66. s selected o i S so 03 03 Powerup bit this bit is set 1 until configuration data is received by the module 04 06 04 06 Critical Error bits If these bits are anything other than all zeroes return the module to the factory for repair 07 07 08 10 09 1 10 12 Calibration Bad bit set to 1 if the channel has not had a valid calibration 11 15 13 17 Unused set to 0 Unused set to 0 a Calibration Range bit set to 1 if a reference signal is out of range during calibration Calibration Done bit set to 1 after an initiated calibration cycle is complete Publication 1794 6 5 7 April 1997 4 6 Writing Configuration to and Reading Status from your Module with a Remote I O Adapter Decimal Bit ees oro Octal Bit Description Write Word 0 00 01 00 01 Module Data Type Bit 01 00 Definition f fo fo fo eaea 777 RN 1 1 Unipolar counts scaled between 0 and 65535 Bit 02 02 Fixed Digital Filter When this bit is set 1 a software digital filter is enabled This filter settles to 100 of a Full Scale step input in 60 times the selected first notch filter time shown on page 4 3 Default filter disabled 03 05 03 05 A D Filter First Notch Frequency Bit 05 0 03 Definition ofofo 10Hz default EEEN ae vp ps se Pee ome po qme ry pree rr pee 06 06 Calibration High Low bit This bitis set during gain calibration reset during offset calibration 07 07 Cali
67. tected in slot position 1 I O Module Fault a when an error is detected in slot position 4 when an error is detected in slot position 5 This bit is set 1 when an error is detected in slot position 6 This bit is set 1 when an error is detected in slot position 7 This bit is set 1 when the node address switch setting has been changed since power up Bit 0 idle Bit 1 run 10 thru 15 Notused sentas zeroes Node Address Changed IIO State Possible causes for an I O Module Fault are e transmission errors on the Flex I O backplane e a failed module e amodule removed from its terminal base incorrect module inserted in a slot position the slot is empty The node address changed bit is set when the node address switch setting has been changed since power up The new node address does not take affect until the adapter has been powered down and then powered back up Publication 1794 6 5 7 April 1997 How Communication Takes Place and I O Image Table Mapping with the DeviceNet Adapter 5 3 System Throughput System throughput from analog input to backplane is a function of e the configured A D filter first notch frequency e the number of channels actually configured for connection to a specific sensor SEE PAGE 4 3 The A D converter which converts channel 0 through 7 analog data to a digital word provides a programmable first notch filter You can set the position of
68. tion check is required follow the procedure below Perform module calibration periodically based on your application Module calibration may also be required to remove module error due to aging of components In addition calibration may be required to eliminate long lead wire resistance to open circuit detection current See Error Due to Open Circuit Current Through Loop Resistance in Appendix A Calibration can be accomplished using any of the following methods manual calibration as described below e 6200 I O CONFIGURATION software version 5 2 or later refer to your 6200 software publications for procedures for calibrating e DeviceNetManager Software refer to your DeviceNetManager software documentation for the DeviceNet Adapter Module Cat No 1794 ADN Some portion of this calibration is included here for use by personnel proficient with DeviceNet Adapter configuration software Important You can use a 1794 TB2 or TB3 terminal base unit if you are using the thermocouple mV module in the millivolt mode only You must use a 1794 TB3T terminal base unit for all thermocouple uses Publication 1794 6 5 7 April 1997 6 2 Calibrating Your Module Tools and E quipment In order to calibrate your thermocouple input module you will need the following tools and equipment Tool or Equipment Description E Analogic 3100 Data Precision 8200 or Thermocouple Simulator Theimecsu Ectron Corporation ade ple Si
69. tion about the procedure The following flow chart shows the procedure for calibration Important Perform the offset calibration procedure first then the gain calibration procedure Publication 1794 6 5 7 April 1997 6 4 Calibrating Your Module Flow Chart for Calibration Procedure Apply reference signal for gain calibration to each channel to be calibrated Apply reference signal for offset calibration to each channel to be calibrated Retain corresponding bits in the calibration mask and set cal Hi Lo 1 Set corresponding bits in the calibration mask and set cal Hi Lo 0 ery er Set cal clk Set cal clk 1 e Oa Cal done 21 Cal done 1 9 NO Bad cal 0 Cal range 0 NO Bad cal 0 Cal range 0 YES Set cal clk 0 Set cal clk 0 and cal hi lo 0 mw 0 9 Exit Exit Cal done 0 YES Clear corresponding bits in the calibration mask Legend block transfer write S block transfer read Publication 1794 6 5 7 April 1997 Calibrating Your Module 6 5 Calibration Setups Using a Precision Voltage Source Lez edi Fa dp e s A el opui af el ure us SSISISISISISISISISISISISISISISIS 0 15 Y SSISISISISISISISISISISISISISISISIS 1 31 5 OOO 1SISSISISISISISISISISISISISISSISIS tc Precision Voltage Source LLL These terminals not on 1794 TB2 1794 TB2 TB3 E Ln Note Use 1794 TB2 and TB3 terminal base units for mil
70. to 1859F Relative Humidity 5 to 95 noncondensing operating 5 to 8096 noncondensing nonoperating Shock Operating 30 g peak acceleration 11 1 ms pulse width Non operating 50 g peak acceleration 11 1 ms pulse width Vibration Tested 5 g 10 500Hz per IEC 68 2 6 Agency Certification e CSA certified when product or packaging is marked e CSA Class l Division 2 Groups A B C D certified e UL listed e CE marked for all applicable directives Installation Instructions Publication 1794 5 21 1 Specifications based on A D filter first notch frequency of 10Hz 2 Use 1794 TB2 or TB3 terminal base unit for millivolt inputs only You must use a 1794 TB3T terminal base unit when using thermocouple inputs 3 Referto the thermocouple manufacturer for the correct extension wire Publication 1794 6 5 7 March 1997 Specifications A 3 Derating Curve User Applied 24V dc Supply versus Ambient Temperature 31 2 f 2 amp 24 0 8 The area within the curve represents the safe ki operating range for the module under various I conditions of user supplied 24V dc supply voltages and ambient temperatures 19 3 7 25 C 40 C 50 C 55 C Safe operating area Ambient Temperature Resolution Curves for Thermocouples Type B Thermocouple Resolution ze esolution ge 1000Hz 500Hz 250Hz 10 100Hz 102 4 25 60 6 40 0 80 1843 4608 1152 T4 89 60 22 40 5 60 0 70 T1613 7037 08 126 76 80 19 20 4 80 0 60 13837 3
71. unit is determined by the current draw through the terminal base Make certain that the current draw does not exceed 10A ATTENTION Total current draw through the terminal base unit is limited to 10A Separate power connections may be necessary ATTENTION Do not daisy chain power or ground from the thermocouple terminal base unit to any ac or dc discrete module terminal base unit How to Install Your Thermocouple mV Input Module 2 3 Methods of wiring the terminal base units are shown in the illustration below Wiring the Terminal Base Units 1794 TB2 and TB3 shown ATTENTION Do not daisy chain power or ground from the thermocouple terminal base unit to any ac or dc discrete module terminal base unit Thermocouple Thermocouple Thermocouple Thermocouple or Analog Module or Analog Module or Analog Module or Analog Module Daisy chaining 5000000000000000 0000000000000000 DO00000000000008 Keleleloleleleieleloielelolelsion H EE SEV tho o 8 Q EI E 24V dc Wiring when total current draw is less than 10A OOOOOOOOOOOOOOOO Thermocouple or Analog Module OOOOO000O000000000 Discrete Module OO000000000
72. wer to the module for 45 minutes before calibrating 3 Click on Configure for the slot containing the thermocouple module Flex 1 0 Adapter 1794 ADN Flex I O Configuration Node Address 22 ALLEN BRADLEY DeviceNet Manager Load from File Module Configuration Module Type 8pt Thermocouple Input Module Type Display Name Spt Relay Output Module 2 mo W apt Analog Output Module amp 170 Configuration 8 Pt Analog Input Module 16pt 24 Vde Src Output Module 19 Catalog No 1 0 Summary Configure Run gt Idle Reset Outputs To Zero Run gt Fault Reset Outputs To Zero E Idle gt Fault Outputs Remain in Idle State Module Fault Zero Inputs s Close Request Sent The following screen appears Module Slot Position 7 1 0 Data Size I words Dutput Size o words Input Size Configuration 1794 IT8 8 Pt Thermocouple Analog 1 0 Module Set to Defaults Cancel Module Data Type A D Filter First Notch Frequency Degrees Centigrade 10 Hz T Fixed Digital Filter Thermocouple Type Channel 0 mitivots s Channel 4 mitivots H Channel 1 milivots H Channel 5 mtvots H Channel 2 milivots H Channel amp mmvots H Channel 3 milivots s Channel 7 mmvots a Calibrating Your Module 6 9 4 Click on asa

1794-6.5.7, Thermocouple/Millivolt Input Module, User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents