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User Manual - Rockwell Automation

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1. Chapter Sumilidly 22 taketa kimo naa ire re iude Chapter 7 Chapter Objective Diagnostics Reported by the Module Troubleshooting with the Indicators Status Reported by the Module Chapter Summary Appendix A Thermocouple Millivolt Input Module Accuracy Lead Resistance Compensation Source Impedance Compensation for Millivolt Inputs PINGING 22er sareei ai brni mieia Programming Examples Data Table Formats Block Transfer Mini PLC 2 and PLC 2 20 Processors Differences Between Series A Series B Series C and Series D Thermocouple Millivolt Input Modules Thermocouple Restrictions Extracted from NBS Monograph 125 IPTS 68 Table of Contents toc iii Appendix B Sample Programs for the Input Module 1 PLC 2 Family Processors 1 PLC 3 Family Processors B 2 PLG 6 Family Processors B 3 Appendix C 4 Digit Binary Coded Decimal BCD C 1 Signed magnitude C 2 Two s Complement Binary C 2 Appendix D Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors 0 1 Setting the Block Len
2. 117 130 Timer Counter Preset Values Area Output Image Table Control Byte Contains Read Enable Bit and Block Length in Binary Code Data Address Contains Module Address in BCD First Address Destination of Transferred Data Input Image Table Status Byte Contains Done Bit Storage Location Contains File Address in BCD R Read 07 Bit 113 030 130 j Rung 1 _ c 1 19 02 120 060 07 012 Rung 2 LT 01 012 Rung 3 02 Setting the Block Length Multiple GET Instructions only to the module s address Publication 1771 6 5 130 May 1999 12172 The input module transfers a specific number of words in one block length The number of words transferred is determined by the block length entered in the output image table control byte corresponding Block Transfer Read Enable Bit For Block Transfer Active Operations Only Number of Words to Transfer Data Table Block Transfer Mini PLC 2 and 2 20 Processors The bits in the output image table control byte bits 00 05 must be programmed to specify a binary value equal to the number of words to be transferred For example NO TAG shows if your input module is set up to transfer 6 words you would set bits 01 and 02 of the lower image table control byte The binary equivalent of 6 words is 000110 You would also set bit 07 when programming the module for block transfer read operations
3. Power Up Bit BTW BLOCK XFER WRITE FILE DATA ADDR 030 06 MODULE ADDR 110 owe BLOCK LENGTH 400 432 400 is the address of the write block transfer data file You want to examine configuration word 1 In RUN PROG Mode Action 1 Press SEARCH 8 lt data address gt 2 Press CANCEL COMMAND 3 Press DISPLAY 0 or 1 4 Press SEARCH 51 Cursor defaults to first entry in file when SEARCH 51 is pressed 5 Press INSERT In PROG Mode Action 1 Press SEARCH 8 lt data address gt 2 Press CANCEL COMMAND 3 Press DISPLAY 0 or 1 4 Press DISPLAY 001 and enter data 5 Press INSERT Result Finds the block address transfer instruction Removes preceeding command Displays the file in binary or BCD On line data change Writes data to file element Result Finds the block transfer instruction Removes preceeding command Displays the file in binary or BCD Puts cursor on word 1 Publication 1771 6 5 130 May 1999 B 2 Programming Examples Use the above procedure to enter the required words of the write block transfer instruction Be aware that the block length will depend on the number of channels selected and whether alarming or user calibration are implemented For example the block may contain only 1 word if no alarming or user calibration are implemented but may contain 27 words if using 8 inputs with alarming and user calibration The PLC 2 family write block transfer data
4. ATTENTION Cautions indicate where equipment may be damaged from misuse You should read and understand cautions and warnings before performing the procedures they precede Related Products You can install your input module in any system that uses Allen Bradley programmable controllers with block transfer capability and the 1771 I O structure Contact your nearest Allen Bradley office for more information about your programmable controllers Product Compatibility These input modules can be used with any 1771 I O chassis Communication between the analog module and the processor is bidirectional The processor block transfers output data through the output image table to the module and block transfers input data from the module through the input image table The module also requires an area in the data table to store the read block and write block data I O image table use is an important factor in module placement and addressing selection The module s data table use is listed in the following table Publication 1771 6 5 130 May 1999 Related Publications Using This Manual P 3 Table P A Compatibility and Use of Data Table Use of Data Table Compatibility Catalog Output Read Write Number image Image Block Block Addressing Chassis Bits Bits Words Words 1 2 slot 1 slot 2 slot Series Ls s ara aime ve ve vs 1771 IXE D A Compatible with 1771 41 2 A4 chassis B Compatible with 1771 A
5. Input 1 lead Input 2 lead Input 2 lead Input 3 lead Input 3 lead Input 4 lead Input 4 lead Not Used Not used Input 5 lead Input 5 lead Input 6 lead Input 6 lead Input 7 lead Input 7 lead Input 8 lead Input 8 lead 100 000mV Wiring Arm Cat No 1771 WI 10531 2 After the connections stabilize request the gain calibration by setting bit 01 in BTW word 28 and sending a block transfer write BTW to the module Refer to Table 6 A When the BTW is sent all channels are calibrated to 100 00mV NOTE Normally all channels are calibrated simultaneously bits 10 17 of word 28 are octal 0 To disable calibration on any channel set the corresponding bit 10 through 17 of word 28 3 Queue BTRs to monitor for gain calibration complete and any channels which may not have calibrated successfully Save Calibration Values If any uncalibrated channel bits bits 10 17 of word 13 are set a save cannot occur Auto calibration should be performed again starting with offset calibration If the module has a faulty channel the remaining functioning channels can be calibrated by inhibiting calibration on the faulty channel Performing Manual Calibration Module Calibration 6 5 The module can be run with the new calibration values but will lose them on power down To save these values proceed as follows 1 Request a save to EEPROM by setti
6. s hardware condition your inputs and enter your data Publication 1771 6 5 130 May 1999 Chapter Objectives Reading Data from the Module Chapter 5 Module Status and Input Data In this chapter you will read about reading data from your module input module read block format Block transfer read programming moves status and data from the input module to the processor s data table in one I O scan Table 5 A The processor user program initiates the request to transfer data from the input module to the processor During normal operation the module transfers up to 12 words to the processor s data table file The words contain module status and input data from each channel When a block transfer length of zero 0 is programmed the 1771 IXE D will respond with the Series default value of 12 Table 5 A BTR Word Assignments for Thermocouple Millivolt Input Module 1771 IXE D wmm Ee MOP EP PPT Pp oar pr pis or oe os az or Input polarity Status bits Inputs over range Inputs under range Inputs gt high alarm Inputs lt low alarms Channel 1 input Channel 2 input Channel 3 input Channel 8 input Cold Junction Temperature in C Auto calibration Status Word 1 one bit per input channel NOTE Channel input and calibration words 4 12 are expressed as follows OF or C millivolt XXXX BCD XX XX BCD or binary Cold Junction Temper
7. wy Allen Bradley Thermocouple Millivolt Input Module Cat No 1771 IXE Series D User Manual Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation 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 that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout thi
8. feature or manually through programming calibration is now done at 0 000mV and 100 000mV If EEPROM read of the auto cal values fails BTR WORD 1 bit 7 is asserted Series A used potentiometers for calibration settings with calibration done at 99 and 99mV RTS can now be reduced to 100ms for all thermocouples by programming RTS 1 The default RTS setting RTS 0 makes data available every 50ms Series A default value was 500ms BTR WORD 12 is the rounded Cold Junction Temperature resolute to 1 degree C displayable in the programmed format BCD 2s complement or signed magnitude In Series A BTR word 12 was the cold junction calibration word BTW WORD 1 bit 7 is no longer used cold junction update Cold Junction calibration by the user is no longer required it is calibrated at power up Cold junction temperature is digitally filtered having a filter time constant of 12 8 seconds It is no longer updated once per 15 second interval Cold junction value is updated continously in Series B Update was once every 15 seconds in Series A Backplane power is approximately 750mA at 5V Series A had a backplane power requirement of 1200mA Differences Between Series A Series B Series C and Series D Thermocouple Millivolt E 3 Accuracy specifications over typical RANGES and TEMPERATURES are Input Type Range IS Range WAS Accuracy IS NOTE Measurements of the most negative temperature extremes are less accurate as the
9. makes data available every 50ms Cold Junction Calibration In Series A BTR word 12 was the cold BTR WORD 12 is the rounded Cold Junction Temperature resolute junction calibration word to 1 degree C displayable in the programmed format BCD 25 complement or signed magnitude Cold Junction calibration done by user Cold Junction calibration automatically calibrated at power up Cold junction temperature is updated Cold junction temperature is digitally filtered with a filter time once per 15 second interval constant of 12 8 seconds Cold junction value is updated continously High and Low Alarms Limits When a low alarm is programmed greater When a low alarm is programmed greater than a high alarm both than a high alarm the Series A displayed low and high alarms will be activated when the input is between only low alarm the two values Backplane Current 1200mA at 5V 750mA at 5V 850mA at 5V Agency Certification e CSA certified CSA certified when product or packaging is CSA Class Division 2 Groups D certified e CSA Class Division 2 Groups B marked e ULlisted C D certified UL listed CE marked for all applicable directives Publication 1771 6 5 130 May 1999 E 2 Differences Between Series A Series B Series C and Series D Thermocouple Millivolt Publication 1771 6 5 130 May 1999 Explanation of Differences Calibration is now done automatically using auto calibration
10. 1771 6 5 130 May 1999 ASTM Standard 230 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 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 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 c
11. Bit 06 is used when block transfer write operations are required Figure D 2 Setting Block Length Multiple GET Instructions only Read 6 Words from Module oO oF 010 Output Image Table Control Byte Contains Read 012 Enable Bit and Block Length in Binary Code 017 027 Data Address 0307 Contains Module Address in BCD 12713 Binary Bit Pattern Lower Output Image Table Byte Publication 1771 6 5 130 May 1999 D 4 Block Transfer Mini PLC 2 and PLC 2 20 Processors Publication 1771 6 5 130 May 1999 Appendix E Differences Between Series A Series B Series C and Series D Thermocouple Millivolt Input Modules Major Differences between The following is a list of major differences between Series A Series Series B Series C and Series D Thermocouple Millivolt Input module cat no 1771 IXE Calibration Uses potentiometers for calibration Calibration is done automatically using auto calibration feature or settings with calibration done at 99 and manually through programming 99mV Offset Gain Calibrations User offset calibration range of 1270uV User offset calibration range is 410 5uV maximum An offset Offset correction of 3 2328 uV bit correction is 3 2328 uV bit User gain correction is now User gain correction of 012207 LSB 00152588 LSB for a maximum of 0 193787 with a maximum of 1 5503 Real Time Sampling Series A default value was 500ms The default RTS setting RTS 0
12. In particular quenching from high temperatures should be avoided ASTM Standard 230 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 should be noted that the Constantan element of Type J 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 1771 6 5 130 May 1999 F 6 Thermocouple Restrictions Publication 1771 6 5 130 May 1999 Index A G Accuracy 1 3 grounding the module 2 6 backplane connector keying 2 3 installing the module 2 4 Bit Word descriptions 1771 IXE interpreting the status indicators 4 6 2 7 block transfer 2 3 Block transfer programming 3 1 K Block transfer read 5 1 bit word descriptions 1771 IXE keying the backplane 2 3 BR assignments 1771 IXE 5 1 M Manual calibration 6 5 C module grounding 2 6 cable lengths 2 6 module installation 2 4 calculating power requirements 2 3 module location in I O chassis 2 3 Calibration module placement 2 3 channel offset 1771 IXE 6 5 procedure for 1771 I
13. L feature accessibility O explanation O other info not in manual Clarity What is unclear L Sequence What is not in the right order Other Comments Use back for more comments Your Name Location Phone Return to Marketing Communications Allen Bradley Co 1 Allen Bradley Drive Mayfield Hts OH 44124 6118 Phone 216 646 3176 FAX 216 646 4320 Publication ICCG 5 21 August 1995 PN 955107 82 PLEASE FASTEN HERE DO NOT STAPLE Other Comments PLEASE FOLD HERE Ei mop od POSTAGE WILL BE PAID BY THE ADDRESSEE Rockwell Automation Allen Bradley 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124 9705 Publication 1771 6 5 130 May 1999 NO POSTAGE NECESSARY IF MAILED IN THE UNITED STATES PLEASE REMOVE ON Rockwell Automation Allen Bradley a Rockwell Automation Business has been helping its customers improve productivity and quality for more than 90 years We design manufacture and support a broad Allen Bradley range of automation 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 E M Argentina e Australia Austria e Bahrain e Belgium e Brazil e Bulgaria e Canada e
14. May 1999 Chapter 4 Chapter Objectives Configuring the Thermocouple Millivolt Input Module 1771 IXE D DC TTE Temperature 5 Data Format Real Time Channel Calibration ouem nex en ees Configuration Block for a Block Transfer Write Bil Word 5 Chapter Summary Chapter 5 Chapter Objectives Reading Data from the Module Bit Word 5 Chapter Summary Chapter 6 Chapter Objective Tools and EqUIPMEnt setac take ses Calibrating Your Input Module About Auto Calibration Performing Auto Calibration Gain Save Calibration Values Performing Manual Calibration Setting Channel Offset Setting Channel Gain Calibration
15. Seebeck coefficient of the thermocouple drops below the input resolution of the module 3 2328uV bit Above specifications are valid to degrees on thermocouple types and User offset calibration range is 410 5uV maximum Series A was 1270uV An offset correction is 3 2328 uV bit not 10uV bit User gain correction is now 00152588 LSB for a maximum of 0 193787 Series A was 01220796 LSB with maximum of 1 550396 Multiple BTRs may occur before configuration of the module A block transfer read request with a word length of 00 will return with the old Series A block transfer default length 27 for a write 12 for a read To access the auto calibration word the block transfer length must be set to 28 for a write and 13 for a read Autocalibration can be performed on all channels simultaneously or on only certain channels of interest In either case channels being calibrated must be connected to the precision voltage source Input impedance gt 10 Megohms channel Whenalow alarm is programmed greater than a high alarm both low and high alarms will be activated when the input is between the two values The Series A displayed only low alarm Aninvalid alarm entry only 0 9 BCD accepted will cause the alarm value to be set equal to zero e In mV mode when displaying in 2 s complement or signed magnitude format the module will continue to display readings past the over or under range limit until the input satura
16. internal to the processor To complement a number means to change it to a negative number For example the following binary number is equal to decimal 22 101105 2210 Publication 1771 6 5 130 1999 Data Table Formats C 3 First the two s complement method places an extra bit sign bit in the left most position and lets this bit determine whether the number is positive or negative The number is positive if the sign bit is 0 and negative if the sign bit is 1 Using the complement method 0 10110 22 To get the negative using the two s complement method you must invert each bit from right to left after the first 1 is detected In the above example 0 10110 22 Its two s complement would be 1 01010 22 Note that in the above representation for 22 starting from the right the first digit is 0 so it is not inverted the second digit is a 1 so it is not inverted All digits after this one are inverted If a negative number is given in two s complement its complement a positive number is found in the same way 1 10010 14 0 01110 14 All bits from right to left are inverted after the first 1 is detected The two s complement of 0 is not found since no first 1 is ever encountered in the number The two s complement of 0 then is still 0 Publication 1771 6 5 130 May 1999 C 4 Data Table Formats Publication 1771 6 5 130 May 1999 Appendix D Block Transfer Mini PLC 2 and
17. observed value was 17 enter 53 0 17 x 3 0933 53 in signed magnitude binary into the upper byte of the calibration word for that channel Enter 10110101 in bits 17 10 of word 20 The lower byte will remain zero at this time 6 Repeat steps 3 through 5 for each of the remaining input channels 7 Initiate a write block transfer to send the corrections to the module The input value read by the processor should now be 0000 for all channels Setting Channel Gain Calibration 1 Now set the precision voltage source for 100 000 millivolts Allow sufficient time at least 10 seconds for the input filter and voltage source to settle Figure 6 5 Applying 100 000mV for Gain Calibration Terminal Identification Terminal 18 17 16 15 14 13 12 11 10 MP gt OO Function Input 1 lead Input 1 lead Input 2 lead Input 2 lead Input 3 lead Input 3 lead Input 4 lead Input 4 lead Not Used Not used Input 5 lead Input 5 lead Input 6 lead Input 6 lead Input 7 lead Input 7 lead Input 8 lead Input 8 lead Apply 100 000mV Wiring Arm 10533 1 Cat 1771 WI Publication 1771 6 5 130 May 1999 6 8 Module Calibration Publication 1771 6 5 130 May 1999 2 Record the input value read by the processor in the BTR file word 4 for channel 1 Determine the percentage difference from 10000 and the sign of the corr
18. to Figure Figure 3 3 Publication 1771 6 5 130 May 1999 B 4 Programming Examples 1 Enter the following rung BTW BLOCK XFER WRITE EN RACK Power Up Bit GROUP DN MODULE CONTROL ER DATA FILE LENGTH N7 60 is the address of the BTW transfer file CONTINUOUS 2 Press F8 F5 and enter N7 60 to display the configuration block The industrial terminal screen should like Figure B 3 Figure B 3 Sample PLC 5 Data File Hexadecimal Data Address 0 5 6 7 8 9 N7 60 5003 0040 0085 0040 0085 0040 N7 70 0085 0040 0085 0040 0085 0000 N7 80 0000 0000 Publication 1771 6 5 130 May 1999 The above data file would configure the module as follow e thermocouples on all inputs temperature scale of Celsius output data in BCD format real time sampling set to a 1 second scan rate all channel alarms ON all channel minimum alarm values set to 40 all channel maximum alarm values set to 85 all calibration values set to 0 Enter the data corresponding to your bit selections and add alarm and calibration values if so desired ESC returns you to the main menu 4 Digit Binary Coded Decimal BCD Appendix Data Table Formats The 4 digit BCD format uses an arrangement of 16 binary digits to represent a 4 digit decimal number from 0000 to 9999 NO TAG The BCD format is used when the input values are to be displayed for operator viewing Each group of four binary digits is used to repres
19. 1B A2B A3B A4B chassis Yes Compatible without restriction No Restricted to complementary module placement You can place your input module in any I O module slot of the I O chassis You can put two input modules in the same module group aninput and an output module in the same module group Do not put the module in the same module group as a discrete high density module unless you are using 1 or 1 2 slot addressing Avoid placing this module close to AC modules or high voltage DC modules For a list of publications with information on Allen Bradley programmable controller products consult our publication index SD499 Publication 1771 6 5 130 May 1999 P 4 Using This Manual Publication 1771 6 5 130 May 1999 Table of Contents Overview of the Thermocouple Millivolt Input Module Installing the Thermocouple Millivolt Input Module Module Programming Chapter 1 Chapter Objectives 1 1 Module Description 1 1 Features of the Input 1 1 How Analog Modules Communicate with Programmable Controllers 1 2 Ure 1 3 Getting Started de 1 3 Chapter Summary 1 3 Chapter 2 Chapter Objectives 2 1 Before You Install Your Input Module 2 1 Prevent Electrostatic D
20. 6 6 Module Calibration Figure 6 4 Shorting Inputs for Offset Calibration Terminal Identification Terminal Function 18 Input 1 lead 17 Input 1 lead Shorting link 16 Input 2 lead Repeat for each channel 15 Input 2 lead 14 Input 3 lead 13 Input 3 lead Short each input 12 Input 4 lead or apply 0 000mV 11 Input 4 lead across each input 10 Not Used channel 9 Not used 8 Input 5 lead 7 Input 5 lead 6 Input 6 lead 5 Input 6 lead 4 Input 7 lead 3 Input 7 lead 2 Input 8 lead 1 Input 8 lead Apply 0 000mV Wiring Arm Cat No 1771 WI 10532 1 3 Observe the input value read by the processor word 4 of the BTR file for channel 1 It should be 0000 4 Multiply the difference between your observed value and 0 000 by 3 0933 Determine the magnitude and sign of the required correction You can adjust the correction up to 127 binary counts 410 56 V A negative correction means that the reading was too high and you want to subtract a corrective amount from that reading A positive correction means that the reading was too low and you want to add a corrective amount to that reading 5 Enter the magnitude and sign of the correction in binary code into the upper offset correction byte of the calibration word for that channel BTW file word 20 bits 17 10 for channel 1 Publication 1771 6 5 130 May 1999 Module Calibration 6 7 For example if the
21. 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 e Iceland e India Indonesia e Ireland e Israel e Italy e Jamaica e Japan e Jordan 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 Thailand e Turkey e United Arab Emirates e United Kingdom e United States e Uruguay 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 1771 6 5 130 May 1999 PN955132 11 Supersedes Publication 1771 6 5 77 January 1991 Copyright 1999 Allen Bradley Company Inc Printed in USA
22. Configuration 4 3 You must indicate what format will be used to read data from your module Typically BCD is selected with PLC 2 processors and binary also referred to as integer or decimal is selected with PLC 3 and 5 processors See Table 4 B and Appendix C for details on Data Format Table 4 B Selecting Format for Reading Data Decimal Bit 10 Decimal Bit 9 Octal Bit 12 Octal Bit 11 Data Format BCD binary coded decimal 2 s complement binary Signed magnitude binary Same as signed magnitude binary The real time sampling RTS mode of operation provides data from a fixed time period for use by the processor RTS is invaluable for time based functions such as PID and totalization in the PLC It allows accurate time based calculations in local or remote I O racks In the RTS mode the module scans and updates its inputs at a user defined time interval AT instead of the default interval The module ignores block transfer read BTR requests for data until the sample time period elapses The BTR of a particular data set occurs only once at the end of the sample period and subsequent requests for transferred data are ignored by the module until a new data set is available If a BTR does not occur before the end of the next RTS period a time out bit is set in BTR status area When set this bit indicates that at least one data set was not transferred to the processor The actual number of data sets misse
23. I O Chassis Key the Backplane Connector Place your module in any slot in the chassis except the leftmost slot which is reserved for processors or adapters ATTENTION Observe the following precautions when inserting or removing keys insert or remove keys with your fingers make sure that key placement is correct Incorrect keying or the use of a tool can result in damage to the backplane connector and possible system faults Installing the Thermocouple Millivolt Input Module 2 3 The module receives its power through the 1771 I O power supply and requires 850mA from the backplane Add this current to the requirements of all other modules in the I O chassis to prevent overloading the chassis backplane and or backplane power supply ATTENTION Do not insert or remove modules from the I O chassis while system power is ON Failure to observe this rule could result in damage to module circuitry Place your module in any I O module slot of the I O chassis except for the extreme left slot This slot is reserved for PC processors or adapter modules Group your modules to minimize adverse affects from radiated electrical noise and heat We recommend the following Group analog input and low voltage dc modules away from ac modules or high voltage dc modules to minimize electrical noise interference Do not place this module in the same I O group with a discrete high density I O module when using 2 slot ad
24. PLC 2 20 Processors Multiple GET Instructions Programming multiple GET instructions is similar to block format Mini PLC 2 and instructions programmed for other PLC 2 family processors The PLC 2 20 Processors data table maps are identical and the way information is addressed and stored in processor memory is the same The only difference is in how you set up block transfer read instructions in your program For multiple GET instructions individual rungs of ladder logic are used instead of a single rung with a block transfer instruction A sample rung using multiple GET instructions is shown in NO TAG and described in the following paragraphs Rung 1 This rung is used to set four conditions Examine On Instruction 113 02 This is an optional instruction When used block transfers will only be initiated when a certain action takes place If you do not use this instruction block transfers will be initiated every I O scan e First GET Instruction 030 120 identifies the module s physical address 120 by rack group and slot and where in the accumulated area of the data table this data is to be stored 030 Second GET Instruction 130 060 indicates the address of the first word of the file 060 that designates where the data will be transferred The file address is stored in word 130 100g above the data address Output Energize Instruction 012 07 enables the block transfer read operation If all condi
25. XE 6 5 tools 6 1 N Communication how data is noise interference 2 3 transferred 1 2 Configuring your module 1771 IXE features 4 1 configuration block 1771 power requirements 2 3 connecting wiring 2 5 from backplane 2 3 Pre installation considerations 2 1 D Programming example PLC 2 3 2 PLC 3 3 4 determining module placement 2 3 PLC 5 3 5 Diagnostics indicators 2 7 7 1 reported by module 7 1 R Real time sampling 4 3 bit settings 4 4 Filtering 3 recommended cable lengths 2 6 Publication 1771 6 5 130 May 1999 Index Publication 1771 6 5 130 May 1999 5 Scan time 3 6 Specifications Thermocouple Millivolt input module 1771 IXE 1 status indicators 2 7 T Thermocouple Millivolt input module features 1 1 Troubleshooting table 1771 IXE 732 V voltage mode input devices recommended cable length 2 6 W wiring connections 2 5 Allen Bradley AB Publication Problem Report wy If you find a problem with our documentation please complete and return this form Pub Name Thermocouple RTD Input Module User Manual Check Problem s Type Describe Problem s Internal Use Only Technical Accuracy C text illustration Completeness procedure step illustration definition info in manual What information is missing L example guideline
26. a data transfer to the buffer file R for use in the program 2 If the data is corrupted during the BTR operation the BTR done bit is not energized and data is not transferred to the buffer file In this case the data in the BTR file will be overwritten by data from the next BTR Rungs 2 and 3 These rungs provide for a user initiated block transfer write BTW after the module is initialized at power up Pressing the pushbutton locks out BTR operation and initiates a BTW that configures the module Block transfer writes will continue for as long as the pushbutton remains closed Rungs 4 and 5 These rungs provide a read write read sequence to the module at power up They also ensure that only one block transfer read or write is enabled during a particular program scan Rungs 6 and 7 These rungs are the conditioning block transfer rungs Include all the input conditioning shown in the example program Publication 1771 6 5 130 May 1999 3 4 Module Programming PLC 3 Programming Example Publication 1771 6 5 130 May 1999 Power up 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 the module when programming a block transfer write or from the module when programming a block transfer read The address of the bl
27. amming Note that PLC 2 processors that do not have the block transfer instruction must use the block transfer format which is outlined in Appendix D Figure 3 1 PLC 2 Family Sample Program Structure Block Transfer Read Done Bit FILE TO FILE MOVE COUNTER ADDR POSITION FILE LENGTH FILE A FILE R RATE PER SCAN pN XXX XXX XXX Storage Pushbutton Bit A E Block Transfer Write Storage Done Bit Pushbutton Bit A 3 1 0 Block Transfer Write Storage Done Bit Bit 4 L Block Transfer Read Storage Done Bit Power up Bit Bit 5 pE MF uU pd Enable Power up Bit Done Bit 6 p t BLOCK XFER READ EN DATA ADDR XXX X7 MODULEADDR RGS BLOCK LENGTH 05 FILE PN L7 Power up Storage Bit Bit BLOCK XFER WRITE DATA ADDR MODULE ADDR RGS BLOCK LENGTH XX FILE XXXX XXXX 7 Storage BitA XXX 1 You can replace the pushbutton with a timer done bit to initiate the block transfer write on a timed basis You can also use any storage bit in memory Module Programming 3 3 Program Action Rung 1 Block transfer read buffer the file to file move instruction holds the block transfer read BTR data file A until the processor checks the data integrity 1 If the data was successfully transferred the processor energizes the BTR done bit initiating
28. an input is out of range bit 10 for channel 1 thru bit 17 for channel 8 Also set for open channel detection Word 3 Bits 00 07 Low alarm bit for each channel is set to indicate the input is less than the low limit value you entered in the corresponding low alarm word word 4 6 8 10 12 14 16 or 18 bit 00 for channel 1 thru bit 07 for channel 8 Bits 10 17 High alarm bit for each channel is set to indicate the input has exceeded the high limit value you entered in the corresponding high alarm word word 5 7 9 11 13 15 17 or 19 bit 10 for channel 1 thru bit 17 for channel 8 Words 4 11 Input for channel 1 through 8 respectively Word 12 IEEE Cold junction temperature in C Word 13 Auto calibration word Bit 00 Offset calibration complete bit Bit 01 Gain calibration complete bit Publication 1771 6 5 130 May 1999 Module Status and Input Data 5 3 Word ELE Definition Word 13 Bit 02 Save to EEPROM bit continued Not used EEPROM fault bit Calibration fault bit Uncalibrated channel bits Chapter Summary In this chapter you learned the meaning of the status information that the input module sends to the processor Publication 1771 6 5 130 May 1999 5 4 Module Status and Input Data Publication 1771 6 5 130 May 1999 Chapter Objective Tools and Equipment Tool or Equipment Precision Voltage Source Industrial Terminal and Interconnect Cable Calibrating Your Input Module About Aut
29. and between input and backplane connections 120dB at 60Hz up to 1000V peak Greater than 10 megohms 60dB at 60Hz 120V rms continuous 270 to 10009C 210 to 1200 C 270 to 1380 C 50 to 1770 C 270 to 400 C Open input produces a maximum value reading in less than 10 seconds 18 terminal wiring arm Cat No 1771 WI 4 digit BCD 2 s complement binary signed magnitude binary Auto calibration offset and gain Zero offset and gain adjustment for each channel via programming terminal Verify every six months for maintaining absolute accuracy Any A B processor using the 1771 I O structure and block transfer 0 to 609C 32 to 140 F Ambient changes greater than 0 5 C per minute may temporarily degrade performance during periods of change 40 to 85 C 40 to 185 F 5 to 9596 without condensation 750mA 5V 3 75 Watts maximum Cat No 1771 WI Between 20 and 22 Between 24 and 26 CSA certified CSA Class Division 2 Groups A B C D certified UL listed CE marked for all applicable directives C Tick marked for all applicable acts Publication 1771 6 5 130 May 1999 A 2 Specifications Thermocouple Millivolt Input Module Accuracy Publication 1771 6 5 130 May 1999 The accuracy of your thermocouple readings depends on module accuracy lead resistance effect accuracy of the thermocouple The accuracy of the module is shown in NO TAG and NO TAG at ambient t
30. ature XXXX BCD or binary C only Publication 1771 6 5 130 May 1999 5 2 Module Status and Input Data Bit Word Descriptions The complete bit word description for the block transfer read from the module is defined in Table 5 B Table 5 B Bit Word Description for Thermocouple Millivolt Input Module 1771 IXE D Word Definition Word 1 Bit 00 Power up bit is set to indicate that the module is waiting for its first write block transfer Bit 01 Out of range bit is set if one or more channel inputs are above or below the range for which you configured the module Bit 02 Real time sample time out bit is set when the module updates an input buffer with new data before the processor has read the previous data Monitor this bit only if you select real time sampling Bit 03 Not used Bit 04 Low cold junction temperature bit is set when the cold junction temperature is less than 0 C Bit 05 High cold junction temperature bit is set when the cold junction temperature exceeds 60 C Bit 06 Not used Bit 07 EEPROM calibration values could not be read Bits 10 17 Polarity bit for each channel is set to indicate negative polarity bit 10 for channel 1 thru bit 17 for channel 8 These bits are used in BCD and signed magnitude data formats Word 2 Bits 00 07 Underrange bit for each channel is set to indicate an input is out of range bit 00 for channel 1 thru bit 07 for channel 8 Bits 10 17 Overrange bit for each channel is set to indicate
31. be for the following offset calibration gain calibration save operation save to EEPROM When using auto calibration write transfer calibration words 20 through 27 must contain zeroes Publication 1771 6 5 130 May 1999 6 2 Module Calibration Performing Calibration of the module consists of applying 0 000mV across each Auto Calibration input channel for offset calibration and 100 000mV across each input channel for gain correction Offset Calibration Normally all inputs are calibrated together To calibrate the offset of an input proceed as follows 1 Apply power to the module 2 Connect shorting links or apply 0 000mV across each input channel on the 1771 WI field wiring arm as shown in Figure 6 1 Figure 6 1 Shorting Inputs for Offset Calibration Terminal Identification Terminal Function 18 Input 1 lead 17 Input 1 lead Shorting link 16 Input 2 lead Repeat for each channel 15 Input 2 lead 14 Input 3 lead 13 Input 3 lead Short each input 12 Input 4 lead or apply 0 000mV 11 Input 4 lead across each input 10 Not Used channel 9 Not used 8 Input 5 lead 7 Input 5 lead 6 Input 6 lead 5 Input 6 lead 4 Input 7 lead 3 Input 7 lead 2 Input 8 lead 1 Input 8 lead Apply 0 000mV 10530 1 Wiring Arm Cat 1771 WI 3 After the connections stabilize request the offset calibration by setting bit 00 in block transfer write word 28 and s
32. ckel 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 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 Thermocouple Restrictions F 5 ASTM Standard 230 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 0C Type E thermocouples can also be supplied to meet spec
33. d by the Status Reported in Word 1 Module Design your program to monitor status bits in the lower byte of word 1 and to take appropriate action depending on your application requirements You may also want to monitor these bits while troubleshooting with your industrial terminal The module sets a bit 1 to indicate it has detected one or more of the following conditions as shown in Table 7 B Table 7 B Status Reported in Word 1 Word Explanation 1 E Module is powered but has not received its first configuration block transfer The green LED is flashing or One or more inputs are out of the range for which you configured the module 02 Module updated its inputs before the processor read them The RTS interval timed out before the processor read the data 03 Not used Word 1 cont The module s ambient temperature is below 0 C Temperature readings will be inaccurate 05 The module s ambient temperature is above 60 C Temperature readings will be inaccurate Publication 1771 6 5 130 May 1999 Troubleshooting 7 3 Word Explanation Not used EEPROM calibration constants could not be read The module will continue to operate but readings may be inaccurate Sign bits for each channel Status Reported in Words 2 and 3 Design your program to monitor over under range bits and to take appropriate action depending on your application requirements You may also want to monitor these bits while troubleshooti
34. d is unknown The time out bit is reset at the completion of the BTR Set appropriate bits in the BTW data file to enable the RTS mode You can select RTS periods ranging from 100 milliseconds msec to 3 seconds in increments of 100msec Refer to Table 4 C below for actual bit settings Note that the default mode of operation is implemented by placing all zeroes in bits 13 through 17 Note that binary representation of the RTS bit string is the RTS period X 100msec For example 900msec 01001 9 X 100msec Publication 1771 6 5 130 May 1999 4 4 Module Configuration Table 4 C Bit Settings for the Real Time Sample Mode poris Sample Time Period 0 0 0 0 RTS default 50ms OO ee 100 ms 0 0 1 0 200 ms 0 0 fit 300 0 1 0 0 400 ms 500 ms Fo fo fi it o 600 ms TE 700 ms 800 ms 1 fo 900 ms Fo i 9 140 1 0 1 1 1 5 Pi fo 1 2 0 sec Pi fi 2 5 sec Ge Important Use decimally addressed bit locations for PLC 5 processors Channel Alarms Each channel has an alarm enable bit an alarm polarity bit and high and low alarm values associated with it These bits and words are explained in the bit word definitions in Table 4 E Calibration You have the ability to calibrate this module using auto calibration or by manually
35. d of the cable tape exposed shield and drain wire with electrical tape to insulate it from electrical contact Cable Grounding Remove a length of cable Pull the foil shield and bare Twist the foil shield and drain Attach a ground lug and apply jacket from the Belden 8761 drain wire from the insulated wire together to form a single heat shrink tubing to the exit area cable wires Bare drain strand Length as needed T uw 20104 Belden 8761 Cable shield 2 Chassis Ground Single point Grounding When you connect grounding conductors to the I O chassis Extend shield to termination point Expose just enough cable to grounding stud place a star washer under the first lug then adequately terminate inner conductors place a nut with captive lock washer on top of each ground lug Ground Lug ey Nut Nut and Captive A 4 Washer i A Grounding Stud Use heat shrink tubing or amp 9 other suitable insulation ron where wire exits cable Re jacket Ie s Shield and Drain R Ground Lug twisted together iS Chassis Side Plate Shield and Drain twisted together Use the cup washer if crimp on lugs are not used 1948 10 Thread forming screw External tooth Washers 19923 Refer to Industrial Automation Wiring and Grounding Guidelines publication 1770 4 1
36. dressing This module uses a byte in both the input and output image tables for block transfer Position the keying bands in the backplane connectors to correspond to the key slots on the module Place the keying bands between 20 and 22 between 24 and 26 0 B I Lp ih UT 1 0 chassis Upper Connector 110224 You can change the position of these bands if subsequent system design and rewiring makes insertion of a different type of module necessary Publication 1771 6 5 130 May 1999 2 4 Installing the Thermocouple Millivolt Input Module Install the Module and Field Wiring Arm ATTENTION Remove power from the 1771 I O chassis backplane and field wiring arm before removing or installing an I O module Failure to remove power from the backplane or wir ing arm could cause module damage degradation of performance or injury Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation locking tab locking bar pin 1771 A1B A2B A3B A3B1 A4B I O chassis 1771 A1B A2B A4B Series chassis locking bar the modules Make sure the locking pins engage card guides Y card guides 5 Pd a Modul odul
37. e 1 9 S L Snap the chassis latch over Module the top of the module to secure it Swing the chassis locking bar down into place to secure 19809 2 Attach the wiring arm 1771 WI to the horizontal bar at the bottom of the I O chassis The wiring arm pivots upward and connects with the module so you can install or remove the module without disconnecting the wires RE d horizontal bar install wiring arm 1771 WI 17643 Publication 1771 6 5 130 May 1999 Connect Wiring to the Field Wiring Arm Installing the Thermocouple Millivolt Input Module Connect your I O devices to the cat no 1771 WI wiring arm shipped with the module Input connections for the 1771 IXE D are shown below Figure 2 1 Wiring Connections for the 1771 IXE Series D Terminal Identification Terminal 18 17 16 15 14 13 12 11 10 n Co Cc qo Function Input 1 4 lead Input 1 lead Input 2 4 lead Input 2 lead Input 3 lead Input 3 lead Input 4 4 lead Input 4 lead Not Used Not used Input 5 4 lead Input 5 lead Input 6 4 lead Input 6 lead Input 7 lead Input 7 lead Input 8 lead Input 8 lead Wiring Arm Cat No 1771 WI ATTENTION Remove power from the 1771 I O chassis backplane and field wiring arm before removing or installing an I O module Failure to remove power from the backplane or wiring arm could ca
38. e input module to read the input channels and place new data into the data buffer Scan time for your module is shown in Figure 3 4 The following description references the sequence numbers in Figure Figure 3 4 Following a block transfer write 1 the module inhibits communication until after it has configured the data and loaded calibration constants 2 scanned the inputs 3 and filled the data buffer 4 Write block transfers therefore should only be performed when the module is being configured or calibrated Any time after the second scan begins 5 a block transfer read BTR request 6 can be acknowledged When operated in the default mode RTS 2 00 a BTR will be released every 50 milliseconds When operated in RTS T BTR will be waived until T millseconds at which time 1 BTR will be released Figure 3 4 Block Transfer Time End of Block Module available Transfer to perform block Write transfer Block Transfer Write Configure 1st Scan 2nd Scan 3rd Scan Time Time 1 2 3 4 5 6 7 8 9 10529 1 Internal Scan time 50msec T 100ms 200ms 300ms 3 1sec Cha pter Summary In this chapter you learned how to program your programmable controller You were given sample programs for your PLC 2 PLC 3 and 5 family processors You also read about module scan time Publication 1771 6 5 130 May 1999 Chapter Objectives Configuring the Thermocouple Milliv
39. ection You can adjust the correction up to 0 19379 A negative correction means that the reading was too high and you want to subtract a corrective amount from that reading A positive correction means that the reading was too low and you want to add a corrective amount to that reading If programming in BCD the upper limit for the display is A000 If the overrange bit is set turn back the voltage reference until the overrange turns off Use the difference for the calculation For example if the observed value was 10014 then 10000 10014 14 and 14 divided by 10000 0 14 Using the following table select gain correction values that most nearly add up to the percentage that you determined in step 1 Select a value only once Bit Value Bit 07 Sign bit Bit 06 0 0976562 Bit 05 0 0488281 Bit 04 0 024414 Bit 03 0 012207 Bit 02 0 00610351 Bit 01 0 00305175 Bit 00 0 00152587 Enter the bit code representing the sum of the corrections into the lower byte gain correction of the calibration word for that channel For example to attain the value of 0 140 you would add Percentage Bit Number 0 0976562 Bit 06 0 024414 Bit 04 0 012207 Bit 03 0 00610351 Bit 02 Total 0 1403807 Enter 11011100 in the lower byte of the calibration word for that channel This entry would set bits 07 sign and 06 04 03 and 02 which is 0 1403807 very close to the required 0 14 Remember to k
40. eep the upper byte the same as it was from step 5 Module Calibration 6 9 4 Repeat the above steps 2 and 3 for channels 2 through 8 5 Initiate a write block transfer to send the corrections to the module The input value read by the processor should now be 10000 A000 for BCD for all channels 6 If the correction changes the result in the wrong direction change the sign and reenter it Important If the 96 correction required is larger than 0 19379 check your reference voltage If the reference voltage is correct perform auto calibration Chapter Summary In this chapter you learned how to calibrate your input module Publication 1771 6 5 130 May 1999 6 10 Module Calibration Publication 1771 6 5 130 May 1999 Chapter Objective Diagnostics Reported by the Module Chapter 7 Troubleshooting We describe how to troubleshoot your module by observing LED indicators and by monitoring status bits reported to the processor At power up the module momentarily turns on both indicators as a lamp test then checks for correct RAM operation EPROM operation EEPROM operation avalid write block transfer with configuration data Thereafter the module lights the green RUN indicator when operating without fault or lights the red FAULT indicator when it detects fault conditions If the red FAULT indicator is on block transfers will be inhibited The module also reports status and specific faults if t
41. emperature 25 C and over the temperature range 0 60 Use the calibration procedure in Chapter 6 to adjust your module to compensate for your specific environment Table A A Thermocouple Range Accuracy Based on Temperatures Above 0 C Thermocouple Temperature Range C Temperature 25 C or F F 32 1409F E 270 to 1000 0 0400 J 210 to 1200 0 0423 K 270 to 1380 0 0640 T 270 to 400 0 0183 R 50 to 1770 0 0914 5010 1770 0 0926 Error is specified from 0 C 32 F to the maximum range of the thermocouple Error does not include thermocouple error see appendix F Table A B Millivolt Range Accuracy Max Error piii Q Calibration Millivolt Drift 9 25 100 to 100 48 85uV 43 856uV C Table A C Radiated Noise Susceptibility Radiated Noise Susceptibility Error 300 1000MHz Circular Wave Field Strength 10V M lt 1 Lead Resistance Compensation Filtering 80megohms Vo Vin 2Vns 2o co Internal Specifications A 3 Allowable Distances The open thermocouple detection circuit injects a current of approximately 7 3 nanoamps into the thermocouple cable A total lead resistance of 1370 ohms 685 ohms one way cable resistance will produce 1 count 10uV of error Source Impedance Compensation for Millivolt Inputs Source resistance causes similar errors to occur with millivolt inputs If source resistance
42. ending a block transfer write BTW to the module Refer to Table 6 A When the BTW is sent all channels are calibrated to 0 000mV Publication 1771 6 5 130 May 1999 Module Calibration 6 3 Table 6 A Write Block Transfer Word 28 Word 28 Requested Save Values Requested Requested Gain Cal Offset Cal NOTE Normally all channels are calibrated simultaneously bits 10 17 of word 28 are octal 0 To disable calibration on any channel set the corresponding bit 10 through 17 of word 28 4 Queue block transfer reads BTRs to monitor for offset calibration complete and any channels which may have not calibrated successfully Refer to Table 6 B Table 6 B Read Block Transfer Word 13 Uncalibrated Channels Auto Calibration Status Word 13 e Rezo inca ca Complete 5 Proceed to Calibration below Gain Calibration Calibrating gain requires that you apply 100 000mV across each input channel Normally all inputs are calibrated together To calibrate the gain of an input proceed as follows 1 Apply 100 000mV across each input channel as shown in Figure 6 2 Publication 1771 6 5 130 May 1999 6 4 Module Calibration Publication 1771 6 5 130 May 1999 Terminal Identification Terminal 18 17 16 15 14 13 12 11 10 9 gt ADDN Figure 6 2 Applying 100 00 for Gain Calibration Function Input 1 lead
43. ent a number from 0 to 9 The place values for each group of digits are 20 21 2 and 23 NO TAG The decimal equivalent for a group of four binary digits is determined by multiplying the binary digit by its corresponding place value and adding these numbers Figure C 1 4 Digit Binary Coded Decimal 0X 23 0 0X22 0 TON G 1X20 1 0 23 0 0X22 0 2 1 21 2 0 20 0 0 23 0 0X22 0 1 1 2 1X20 1 1 23 8 0X22 0 ff 1X20 1 Roe Nem mms 1 2 3 9 12955 1 Publication 1771 6 5 130 May 1999 C 2 Data Table Formats Table C A BCD Representation 23 8 28 2 2001 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 1 8 1 9 Sig ned magnitude Binary Signed magnitude binary is a means of communicating numbers to your processsor It should be used with the PLC 2 family when performing computations in the processor It cannot be used to manipulate binary 12 bit values or negative values Example The following binary number is equal to decimal 22 10110 2210 The signed magnitude method places an extra bit sign bit in the left most position and lets this bit determine whether the number is positive or negative The number is positive if the sign bit is 0 and negative if the sign bit is 1 Using the signed magnitude method 0 10110 22 1 10110 22 Two s Complement Binary Two s complement binary is used with PLC 3 processors when performing mathematical calculations
44. es for Channel 8 Auto calibration Request Word enable bit for input types refer to bit word description T temperature scale bit refer to bit word description Publication 1771 6 5 130 May 1999 4 6 Module Configuration Bit Word Descriptions Word Word 1 Publication 1771 6 5 130 May 1999 Bit word descriptions of BTW file words 1 thru 3 configuration 4 thru 19 channel alarm values and 20 thru 27 calibration values are presented in Table 4 E Enter data into the BTW instruction after entering the instruction into your ladder diagram program Table 4 E Bit Word Definitions for Thermocouple Millivolt Input Module Description bits 00 02 Input type codes for inputs 1 thru 8 or 1 thru 4 if bit 06 is set to 1 Tells the module what type of input device you connected to the module Type Millivolt input E thermocouple J thermocouple thermocouple thermocouple R thermocouple S thermocouple bits 03 05 Input type codes for inputs 5 thru 8 bit 06 must be set to 1 Tells the module what type of input device you connected to inputs 5 thru 8 Type Millivolt input E thermocouple J thermocouple thermocouple T thermocouple R thermocouple S thermocouple When set to 0 bits 00 02 define input type for all channels When set to 1 bits 00 02 defines input type for channels 1 4 and bit 03 05 defines input type for channels 5 8 bit 07 Not used set
45. file should look like Figure B 1 Figure B 1 Write Block Transfer Data Transfer for a PLC 2 Family Processor DATA ADDR 030 BINARY DATA MONITOR BLOCK LENGTH 27 BLOCK XFER WRITE MODULE ADDR 110 FILE 400 432 POSITION FILE DATA 001 00000000 00000000 00000000 00000000 002 00000000 00000000 00000000 00000000 003 00000000 00000000 00000000 00000000 004 00000000 00000000 00000000 00000000 005 00000000 00000000 00000000 00000000 006 00000000 00000000 00000000 00000000 007 00000000 00000000 00000000 00000000 008 00000000 00000000 00000000 00000000 PLC 3 Family Processors Following is a sample procedure for entering data in the configuration words of the write block transfer instruction when using PLC 3 processor For a complete sample program refer to Figure Figure 3 2 To enter data in the configuration words follow these steps Example Enter the following rung for a write block transfer TW BLOCK XFER WRITE RACK 001 GROUP 1 Power Up Bit MODULE 1 HIGH DATA F0003 0000 LENGTH 27 CNTL FB004 0000 F0003 0000 is the address of the write block transfer data file You want to enter examine word 1 Publication 1771 6 5 130 May 1999 PLC 5 Family Processors 1 2 WORD 00000 00004 00010 00014 00020 Programming Examples B 3 Press SHIFT MODE to display your ladder diagram on the industrial terminal Press DD 03 0 ENTER to display the block transfer write file The industr
46. for additional information Publication 1771 6 5 130 May 1999 Interpret Status Indicators Green RUN indicator Red FAULT indicator Chapter Summary Installing the Thermocouple Millivolt Input Module 2 7 The front panel of the thermocouple mV input module contains a green RUN indicator and a red FAULT indicator At power up the module momentarily turns on the red indicator as a lamp test then checks for correct RAM operation EPROM operation EEPROM operation e a valid write block transfer with configuration data If there is no fault the red indicator turns off Thereafter the module lights the green RUN indicator when operating without fault or lights the red FAULT indicator when it detects fault conditions If the red FAULT indicator is on block transfers will be inhibited Possible module fault causes and corrective action are discussed in Chapter 8 Troubleshooting In this chapter you learned how to install your input module in an existing programmable controller system and how to wire to the field wiring arm Publication 1771 6 5 130 May 1999 2 8 Installing the Thermocouple Millivolt Input Module Publication 1771 6 5 130 May 1999 Chapter Objectives Block Transfer Programming Chapter 3 Module Programming In this chapter we describe Block Transfer programming e Sample programs in the PLC 2 PLC 3 and PLC 5 processors Module scan time issues Your module communicates w
47. gth Multiple GET Instructions only D 2 Appendix E Major Differences between Series E 1 Appendix F General F 1 J Iron vs Copper Nickel lt Constantan gt Type Thermocouple 1 Nickel Chromium vs Nickel Aluminum Type Thermocouple F 2 T Copper vs Copper Nickel lt Constantan gt Type Thermocouple F 3 E Nickel Chromium vs Copper Nickel lt Constantan gt Type Thermocouple T F 4 Platinum 10 Rhodium vs Platinum amp Platinum 13 Rhodium vs Platinum Type Thermocouples F 5 Publication 1771 6 5 130 May 1999 toc iv Table of Contents Publication 1771 6 5 130 May 1999 Chapter Objectives Module Description Features of the Input Module Chapter 1 Overview of the Thermocouple Millivolt Input Module This chapter gives you information on features of the input module how an input module communicates with programmable controllers The Thermocouple Millivolt input module is an intelligent block transfer module that interfaces analog input signals with any Allen Bradley programmable controllers that have block transfer capability Block transfer programming moves input data words from the module s memory to a designated area in the processor data table in a single scan It also moves configuration words from the processor data table to module memory The input module is a single
48. he 1771 IXE D will respond with the Series A default value of 27 Publication 1771 6 5 130 May 1999 4 2 Module Configuration Input Type The thermocouple millivolt input module accepts the following types of inputs Table 4 A Types of Inputs Temperature Range C INE ae ee ee nee Oe Ee 8 re ie Input Type Input Type Lx omes prp ppp sve mm 50 to 1770 The input type is selected by setting bits in the block transfer write BTW file Two different inputs can be selected You can have 4 inputs set for one type and 4 inputs set for another type or you can have all inputs the same If you select different types of inputs set bit 06 to 1 If you do not select 2 different input types the module defaults to all inputs set to those selected by bits 00 02 Set these bits Set this bit for 2 different for input type input types see table 5 D ac i Sample Time Format Input Input Type Word Tem perature Scale The temperature scale reported by the module is selected by setting bit 10 in the configuration word When bit 10 is set 1 the temperature is reported in degrees Fahrenheit When reset 0 the temperature is reported in degrees Celsius The temperature bit 10 is ignored when the millivolt input type is selected Publication 1771 6 5 130 May 1999 Data Format Real Time Sampling Module
49. hey occur in every transfer of data to the PC processor Monitor the green and red status indicators and status bits in word 1 of the BTR file when troubleshooting your module Figure 7 1 Status Indicators TC MV MODULE RUN Green RUN LED FLT Red FLT LED 10534 1 Publication 1771 6 5 130 May 1999 7 2 Troubleshooting Troubleshooting with the Table 7 A shows LED indications and probable causes and Indicators recommended actions to correct common faults Table 7 A Troubleshooting Chart for Thermocouple Millivolt Input Module 1771 IXE D Indication Probable Cause Recommended Action Both LEDs are OFF No power to module Check power to I O chassis Recycle as Possible short on the module necessary LED driver failure Replace module Red FLT LED ON and Microprocessor oscillator or EPROM failure Replace module Green RUN LED is ON Red FLT LED ON If immediately after power up indicates RAM or Replace module EPROM failure If during operation indicates possible Replace module microprocessor or backplane interface failure Green RUN LED is flashing Power up diagnostics successfully completed Normal operation If LED continues to flash and write block transfers Replace module BTW cannot be accomplished you have a possible interface failure 1 When red LED is on the watchdog timer has timed out and backplane communications are terminated Your user program should monitor communication Status Reporte
50. ial limits of error which are less than the standard limits of error given above 1 25 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 Platinum 10 Rhodium vs Platinum amp Platinum 13 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 thermocouples are sensitive to their heat treatments
51. ial terminal screen should look like Figure B 2 Notice the highlighted block of zeroes This highlighted block is the cursor It should be in the same place as it appears in Figure B 2 If it is not you can move it to the desired position with the cursor control keys Once you have the highlighted cursor in the right place you can go on to step 3 Enter the data corresponding to your bit selection in words 0 through 4 When you have entered your data press ENTER If you make a mistake make sure the cursor is over the word you desire to change Enter the correct data and press ENTER Figure B 2 Write Block Transfer for a PLC 3 Processor START W0003 0000 0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 DATA MONITOR PROG I O OFF 5 NO FORCES 1 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 W03 0 NO EDITS 2 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 RUNG RM000000 3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 MEM PROT OFF Press CANCEL COMMAND This returns you to the ladder diagram The following is a sample procedure for entering data in the configuration words of the block transfer write instruction when using a PLC 5 processor For a complete sample program refer
52. is less than 100 ohms no compensation is necessary to maintain stated accuracy If source resistance is greater than 100 ohms the error can be calculated as follows 309329 0 22 Vin Error in calibration counts Rs 15M ohms Where source resistance one way cable resistance Vin applied input voltage When using thermocouples Vin is the approximate thermocouple voltage of the temperature of interest Vo To maintain a display error of lt 5uV at Vin OV Rs should be lt 341 ohms Refer to NBS NM 125 Thermocouple Reference Tables for determining actual thermocouple voltage versus temperature readings The analog input module has hardware based high frequency filters on all channels to reduce the effect of electrical noise on the input signal In addition a 6 pole digital filter which begins rolling off at 8 0Hz is also incorporated Publication 1771 6 5 130 May 1999 4 Specifications Publication 1771 6 5 130 May 1999 Sample Programs for the Input Module PLC 2 Family Processors Appendix B Programming Examples The following are sample programs for entering data in the configuration words of the write block transfer instruction when using the PLC 2 PLC 3 5 family processors To enter data in the configuration words follow these steps NOTE For complete programming sample refer to Figure 4 1 Example Enter the following rung for a write block transfer
53. ischarge 2 1 Understand Compliance to European Union Directives 2 2 mro P T 2 2 Low Voltage 2 2 Understand Product Compatibility 2 2 Calculate Power Requirements 2 3 Determine Module Placement the 1 0 Chassis 2 3 Key the Backplane 2 3 Install the Module and Field Wiring 2 4 Connect Wiring to the Field Wiring Arm 2 5 Cable LONGING rr Tm 2 6 Ero Rr 2 6 Interpret Status 5 2 7 Chanter SUMMAN 2 7 Chapter 3 Chapter Objectives 3 1 Block Transfer Programming 3 1 PLC 2 Programming Example 3 2 Progam ACUDI 2c ee bende 3 3 PLC 3 Programming Example 3 4 Progam AOBOR suo duh eee sues Sete se Seon 3 4 PLC 5 Programming Example 3 5 Module Scan 3 6 Chapter Summary 3 6 Publication 1771 6 5 130 May 1999 toc ii Table of Contents Module Configuration Module Status and Input Data Module Calibration Troubleshooting Specifications Publication 1771 6 5 130
54. ith the processor through bidirectional block transfers This is the sequential operation of both read and write block transfer instructions The block transfer write BTW instruction is initiated when the analog module is first powered up and subsequently only when the programmer wants to write a new configuration to the module At all other times the module is basically in a repetitive block transfer read BTR mode The following example programs accomplish this handshaking routine These 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 analog input module will work with a default configuration of all zeroes entered in the configuration block See the configuration default section to understand what this configuration looks like Also refer to Appendix B for example configuration blocks and instruction addresses to get started Your program should monitor status bits such as overrange underrange alarms etc and block transfer read activity The following example programs illustrate the minimum programming required for communication to take place Publication 1771 6 5 130 May 1999 3 2 PLC 2 Programming Example Publication 1771 6 5 130 May 1999 Module Progr
55. mm and 871C for AWG 24 or 28 0 5 or 0 3mm 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 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 thermoelements since Type TP thermoelements oxidize rapidly above this temperature However the thermoelectric properties of Type TP thermoelements are apparently not grossly affected by oxidation since 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
56. n an industrial environment Low Voltage Directive This product is tested to meet Council Directive 73 23 EEC Low Voltage by applying the safety requirements of EN 61131 2 Programmable Controllers Part 2 Equipment Requirements and Tests For specific information required by EN 61131 2 see the appropriate sections in this publication as well as Allen Bradley publication 1770 4 1 Industrial Automation Wiring and Grounding Guidelines Open style devices must be provided with environmental and safety protection by proper mounting in enclosures designed for specific application conditions See NEMA Standards publication 250 and IEC publication 529 as applicable for explanations of the degrees of protection provided by different types of enclosure Understand Product The 1771 IXE module can be used with any 1771 I O chassis Compatibility Compatibility and data table use is listed below Use of Data Table Compatibility Catalog Number Input Output Read Write Addressing Image Image Block Block Bits Bits Words Words 1 2 Slot Lr pe a a Compatible with 1771 A1 A2 A4 B Compatible with 1771 A1B A2B A3B A3B1 A4B Y Compatible without restriction Chassis Series 1771 IXE D Do not use this module with cat 1771 AL PLC 2 20 or 2 30 Local Adapter Publication 1771 6 5 130 May 1999 Calculate Power Requirements Determine Module Placement in the
57. ng bit 02 in BTW word 28 and sending the BTW to the module Refer to Table 6 A 2 Queue BTRs to monitor for save complete EEPROM fault and calibration fault An EEPROM fault indicates a nonoperative EEPROM a calibration fault indicates at least one channel was not properly offset or gain calibrated and a save did not occur You calibrate each channel by applying a precision voltage to the input terminals comparing correct with actual results and entering correction into the corresponding calibration word for that channel The correction takes affect after it is transferred to the module by the corresponding BTW instruction in your ladder diagram program Always start with offset adjustment followed by gain adjustment Before calibrating the module you must enter ladder logic into processor memory so that you can initiate write block transfers to the module and the processor can read inputs from the module Write transfers will contain calibration values in words 20 through 27 for the channel you are calibrating Use a precision voltage source such as Data Precision 8200 or equivalent for your calibration input voltage Setting Channel Offset Calibration 1 Select the millivolt range and binary data format BCD could be used but it cannot display values larger than 100mV required during gain calibration 2 Apply 0 000 millivolts to the channel input as shown in Figure 6 3 Publication 1771 6 5 130 May 1999
58. ng with your industrial terminal Bits 00 07 and 10 17 each represent an input for channels 1 8 respectively For example bit 04 represents input channel 5 The module sets a bit 1 to indicate it has detected an out of range condition Refer to Table 7 C Table 7 C Status Reported in Words 2 and 3 Word Bit Condition 2 00 07 Inputs underrange Bit 00 is channel 1 bit 07 is channel 8 If input connections and voltages are correct this status may indicate failed channel communications with the microprocessor If all channels are underrange this indicates a possible dc dc converter failure or a blown fuse 10 17 Inputs overrange Bit 10 is channel 1 bit 17 is channel 8 If input connections and voltages are correct this status may indicate a failed thermocouple functional analog block TC FAB 3 00 07 Corresponding channel input value is below the alarm value that you entered for that channel 10 17 Corresponding channel input value has exceeded the alarm value that you entered for that channel Publication 1771 6 5 130 May 1999 7 4 Troubleshooting Chapter Summary Publication 1771 6 5 130 May 1999 Status Reported in Word 13 Design your program to monitor status bits in word 13 during auto calibration and to take appropriate action depending on your requirements You may also want to monitor these bits while troubleshooting with your industrial terminal The module sets a bit 1 to indicate it ha
59. nt manufacturers The total and specific types of impurities that occur in commercial iron change with time location of primary ores and methods of smelting 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 thermocouples are taken to high temperatures especially above 900C they will lose accuracy of their calibration when they are recycled to lower temperatures Publication 1771 6 5 130 May 1999 F 2 Thermocouple Restrictions Publication
60. ntil the pushbutton is used to request another block transfer write After this single block transfer write is performed the module returns to continuous block transfer reads automatically The PLC 5 program is very similar to the PLC 3 program with the following exceptions You must use enable bits instead of done bits as the conditions on each rung A separate control file must be selected for each of the BT instructions Refer to Appendix B Figure 3 3 PLC 5 Family Sample Program Structure BT BLOCKXFERREAD Hen X GROUP X HDN Pushbutton Power up Bit MODULE X CONTROL HER DATAFILE LENGTH XX CONTINUOUS N BLOCK XFER WRITE EN RACK GROUP DN MODULE CONTROL XXX XX HER FILE LENGTH XX CONTINUOUS N Program Action Rungs 1 and 2 At power up the program enables a block transfer read and examines the power up bit in the BTR file rung 1 Then it initiates one block transfer write to configure the module rung 2 Thereafter the program continuously reads data from the module rung 1 A subsequent BTW operation is enabled by a pushbutton switch rung 2 Changing processor mode will not initiate a block transfer write unless the first pass bit is added to the BTW input conditions Publication 1771 6 5 130 May 1999 3 6 Module Programming Module Scan Time Scan time is defined as the amount of time it takes for th
61. o Calibration Chapter 6 Module Calibration In this chapter we tell you how to calibrate your module In order to calibrate your input module you will need the following tools and equipment Model Type Available from 0 100mV 10 resolution Analogic 3100 Data Precision 8200 or equivalent Programming terminal for Cat No 1770 T3 or Cat Allen Bradley Company family processors 1784 145 T47 T50 etc Highland Heights OH The thermocouple millivolt input module is shipped already calibrated If it becomes necessary to recalibrate the module you must calibrate the module in an I O chassis The module must communicate with the processor and industrial terminal Before calibrating the module you must enter ladder logic into the processor memory so that you can initiate BTWSs to the module and the processor can read inputs from the module Calibration can be accomplished using either of two methods e auto calibration manual calibration Auto calibration calibrates the input by generating offset and gain correction values and storing them in EEPROM These values are read out of EEPROM and placed in RAM memory at initialization of the module The auto calibration routine operates as follows Whenever a block transfer write BTW of length 28 is performed to the module any time after the module has been powered up it interrogates word 28 for a request for auto calibration The request can
62. ock transfer data files are stored in the block transfer control file The industrial terminal prompts you to create a control file when a block transfer instruction is being programmed 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 2 and described below Figure 3 2 PLC 3 Family Sample Program Structure BTR BLOCK XFER READ Block Transfer RACK XXX Read Done Bit GROUP X MODULE X XXXX DATA XXXX XXXX LENGTH X CNTL XXXX XXXX Block Transfer BT Write Done Bit Pushbutton Midi BLOCK XFER WRITE RACK XXX GROUP X MODULE X XXXX DATA XXXX XXXX LENGTH X CNTL XXXX XXXX Program Action At power up the user program examines BTR done bit in the block transfer read file initiates a write block transfer to configure the module and then does consecutive read block transfers continuously The power up bit can be examined and used anywhere in the program PLC 5 Programming Example BTR Enable Module Programming 3 5 Rungs 1 and 2 Rungs 1 and 2 are the block transfer read and write instructions The BTR enable bit in rung 1 being false initiates the first read block transfer After the first read block transfer the module performs a block transfer write and then does continuous block transfer reads u
63. 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 Publication 1771 6 5 130 May 1999 F 4 Thermocouple Restrictions Publication 1771 6 5 130 May 1999 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 230 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 59 8C between 59 and 93C and 3 4 percent 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 E Ni
64. olt Input Module 1771 IXE D Chapter Al Module Configuration In this chapter you will read how to configure your module s hardware condition your inputs and enter your data Because of the many analog devices available and the wide variety of possible configurations you must configure your module to conform to the analog device and specific application that you have chosen Data is conditioned through a group of data table words that are transferred to the module using a block transfer write instruction You can configure the following features for the 1771 IXE D module e type of input e one or two input types 9C or F e data format real time sampling alarming calibration Configure your module for its intended operation by means of your programming terminal and write block transfers Note Programmable controllers that use 6200 software programming tools can take advantage of the IOCONFIG utility to configure this module IOCONFIG uses menu based screens for configuration without having to set individual bits in particular locations Refer to your 6200 software literature for details During normal operation the processor transfers from 1 to 27 words to the module when you program a BTW instruction to the module s address The BTW file contains configuration words high and low channel alarm settings and calibration values that you enter for each channel When a block transfer length of 0 is programmed t
65. ontinuous 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 Thermocouple Restrictions F 3 ASTM Standard 230 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 specified 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 8
66. processor transfers data to and from the module using BTW Communicate with block transfer write and BTR block transfer read instructions in Programmable Controllers your ladder diagram program These instructions let the processor obtain input values and status from the module and let you establish the module s mode of operation Figure 1 1 1 The processor transfers your configuration data and calibration values to the module using a block transfer write instruction 2 External devices generate analog signals that are transmitted to the module Figure 1 1 Communication Between Processor and Module BTW E Memory 6 cu i User Program a 2 To Output Devices i BTR 4 Thermocouple Millivolt PC Processor Input Module PLC 5 40 Shown 1771 IXE B 12933 1 Publication 1771 6 5 130 May 1999 Overview of the Thermocouple Millivolt Input Module 1 3 Accuracy Getting Started Input Module 1771 IXE D Chapter Summary 3 The module converts analog signals into binary or BCD format and stores theses values until the processor requests their transfer 4 When instructed by your ladder program the processor performs a read block transfer of the values and stores them in a data table 5 The processor and module determine that the transfer was made without error and that input values are within specified range 6 Your ladder program can use and or move
67. rief overview of the topics covered in that chapter Chapter Title Topics Covered 1 Overview of the Input Module Description of the module including general and hardware features 2 Installing the Input Module Module power requirements keying chassis location Wiring of field wiring arm 3 Module Programming How to program your programmable controller for this module Sample programs Module Configuration Hardware and software configuration Module write block format 5 Module Status and Input Data Reading data from your module Module read block format 6 Module Calibration How to calibrate your module 7 Troubleshooting Diagnostics reported by the module Appendix A Specifications Your module s specifications Appendix Programming Examples Appendix C Data Formats Information on BCD signed magnitude binary and 2 s complement binary A Publication 1771 6 5 130 May 1999 P 2 Using This Manual Appendix D Block Transfer with Mini PLC 2 and How to use GET GET instructions for block transfer with Mini PLC 2 20 Mini PLC 2 and Mini PLC 2 20 processors Appendix E Differences between Series A B C and Lists differences from Series A 1771 IXE module D versions Appendix F Thermocouple Characteristics Extractions from NBS Monograph 125 IPTS 68 Warnings and Cautions This manual contains warnings and cautions ATTENTION warning indicates where you may be injured if you use your equipment improperly
68. s 4 6 8 10 12 14 16 and 18 for channels 1 thru 8 respectively bits 10 17 High alarm polarity bits tell the module the sign of the values that you enter in high alarm words set for negative reset for positive Bits 10 17 represent words 5 7 9 11 13 15 17 and 19 for channels 1 thru 8 respectively Words 4 Low and High channel alarm values that you enter via the terminal in thru 19 BCD are converted automatically by the module to its own format Store low and high channel alarms in pairs low alarm values in even numbered words high alarm values in odd numbered words For example store channel 1 low and high alarm values in words 4 and 5 respectively Publication 1771 6 5 130 May 1999 4 8 Module Configuration Word Description Calibration words are a composite of two independent bytes for each channel Enter calibration data in signed magnitude binary only The most significant bit in each byte is the sign bit set for negative reset for positive Use the high byte bits 10 17 for offset correction the low byte bits 00 07 for gain correction for each channel Use word 20 for channel 1 thru word 27 for channel 8 Refer to Chapter 7 for calibration procedures Words 20 thru 27 Auto calibration request word used to automatically calibrate selected channels and save the calibration constants in EEPROM Refer to Chapter 7 Word 28 Chapter Summary In this chapter you learned how to configure your module
69. s detected one or more of the following conditions as shown in Table 7 D Table 7 D Status Reported in Word 13 Condition Bit 10 channel 1 through bit 17 channel 8 could not be calibrated Check field wiring arm connections and source for proper voltage In this chapter you learned how to interpret the LED status indicators status words and troubleshoot your input module Appendix A Specifications Number of Inputs I O Chassis Location Type of Input Selectable Thermocouple Linearization Cold Junction Compensation Temperature Scale Selectable Input Resolution Input Isolation Common Mode Rejection Common Mode Impedance Normal Mode Rejection Input Overvoltage Protection Open Input Detection Input Connections Data Format Selectable Calibration Processor Compatibility Environmental Conditions Operating Temperature Rate of Change Storage Temperature Relative Humidity Backplane Power Consumption Field Wiring Arm Keying Agency Certification when product is marked 8 all of the same type or 4 each of 2 different types Any single I O module slot Type E chromel constantan Type J iron constantan Type K chromel alumel Type R Pt Pt 13 Rh Type T copper constantan Type S Pt Pt 10 Rh 50 to 1770 C Millivolt 100 to 100mV dc IPTS 68 standard NBS MN 125 Range 0 to 60 C Accuracy 0 5 C 9C or F 19C 19F or 10uV 1000V peak between inputs between input and common
70. s manual we use notes to make you aware of safety considerations ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention statements help you to identify a hazard avoid the hazard recognize the consequences Important Identifies information that is critical for successful application and understanding of the product ControlNet is a trademark PLC is a registered trademark of Allen Bradley Company Inc Purpose of Manual Audience Vocabulary Manual Organization Preface Using This Manual This manual shows you how to use your Thermocouple Millivolt input module with an Allen Bradley programmable controller It helps you install program calibrate and troubleshoot your module You must be able to program and operate an Allen Bradley programmable controller PLC to make efficient use of your input module In particular you must know how to program block transfer instructions We assume that you know how to do this in this manual If you do not refer to the appropriate PLC programming and operations manual before you attempt to program this module In this manual we refer to The individual input module as the input module The Programmable Controller as the controller This manual is divided into eight chapters The following chart shows each chapter with its corresponding title and a b
71. setting the individual channel words Words 20 through 27 in the configuration word Table 4 E are the calibration words for channels 1 through 8 respectively Calibration is explained in chapter 6 Publication 1771 6 5 130 May 1999 Module Configuration 4 5 Configuration Block for a The complete configuration block for the block transfer write to the Block Transfer Write Word 1 Oo CO NI Oo oy 11 28 module is defined in Table 4 D below Table 4 D Configuration Block for Thermocouple Millivolt Input Module Block Transfer Write E22 C COR COR d eee CR mew a Not Used Enable Channel Alarms one bit per input channel Low Alarms Polarity one bit per input channel Channel 1 Low Alarm Value Channel 1 High Alarm Value Channel 2 Low Alarm Value Channel 2 High Alarm Value Channel 3 Low Alarm Value Channel 3 High Alarm Value Channel 4 Low Alarm Value Channel 4 High Alarm Value Channel 5 Low Alarm Value Channel 5 High Alarm Value Channel 6 Low Alarm Value Channel 6 High Alarm Value Channel 7 Low Alarm Value Channel 7 High Alarm Value Channel 8 Low Alarm Value Channel 8 High Alarm Value Calibration Values for Channel 1 Calibration Values for Channel 2 Calibration Values for Channel 3 Calibration Values for Channel 4 Calibration Values for Channel 5 Calibration Values for Channel 6 Calibration Values for Channel 7 Calibration Valu
72. slot module which does not require an external power supply After scanning the analog inputs the input data is converted to a specified data type in a digital format to be transferred to the processor s data table on request The block transfer mode is disabled until this input scan is complete Consequently the minimum interval between block transfer reads is the same as the total input update time for each analog input module 5011 The 1771 IXE D module senses up to 8 differential analog inputs and converts them to values compatible with Allen Bradley programmable controllers This module s features include 8 input channels configurable for thermocouple input ranges or millivolt input ranges Types E J K T R and S thermocouples and 100 millivolts two types of inputs allowed 4 of one input type and 4 of another cold junction compensation e scaling to selected temperature range in C or F temperature resolution of 1 C or 1 F millivolt resolution to 10 microvolts user selectable high and low temperature alarms Publication 1771 6 5 130 May 1999 1 2 Overview of the Thermocouple Millivolt Input Module all features selectable through programming e self diagnostics and status reporting at power up detection of open circuit if thermocouple fails automatic offset and gain calibration for each channel software calibration of all channels eliminating potentiometers How Analog Modules The
73. tes The module employs a digital filter capable of 120dB decade rolloff from a corner frequency of 8 Hz This Series B module is NOT compatible with the 1771 EX extender board Use the 1771 EZ extender board with Series B Publication 1771 6 5 130 May 1999 E 4 Differences Between Series A Series B Series C and Series D Thermocouple Millivolt Publication 1771 6 5 130 May 1999 The Series B module requires approximately 2 seconds to execute initialization after power is applied The red LED will be turned on and the green LED extinguished when the watchdog timer times out A type code of 1115 will yield S type thermocouple Data format of 112 yields signed magnitude instead of 2 s complement When the module is programmed for RTS 0 and the PLC is switched from run to program and back to run an RTS timeout is inhibited on the switch from program to run Allowable ambient temperature change to maintain accuracy is 0 59C min Series B C and D have CE certification General Appendix F 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 J T E and S J Iron vs Copper Nickel Constantan Type Thermocouple The J thermocouple 1 the least suitable for accurate thermometry because there are significant nonlinear deviations in the thermoelectric output from differe
74. the data if valid before it is written over by the transfer of new data subsequent transfer 7 Your ladder program should allow write block transfers to the module only when enabled by the operator at power up The accuracy of the input module is described in Appendix A Your input module package contains the following items Please check that each part is included and correct before proceeding User s Manual Field Wiring Arm User s Manual Cat No 1771 WI 1771 6 5 130 10526 1 In this chapter you read about the functional aspects of the input module and how the module communicates with programmable controllers Publication 1771 6 5 130 May 1999 1 4 Overview of the Thermocouple Millivolt Input Module Publication 1771 6 5 130 May 1999 Chapter Objectives Before You Install Your Input Module Prevent Electrostatic Discharge Chapter 2 Installing the Thermocouple Millivolt Input Module This chapter gives you information on calculating the chassis power requirement choosing the module s location in the I O chassis e keying a chassis slot for your module wiring the input module s field wiring arm installing the input module Before installing your input module in the I O chassis you must Action required Refer to Calculate the power requirements of all modules in each chassis Calculate Power Requirements Determine where to place the module in the I O chassis Module Loca
75. tion in the I O Chassis Key the backplane connector in the I O chassis Module Keying Make connections to the wiring arm Connecting Wiring and Grounding The thermocouple mV input module is sensitive to electrostatic discharge ATTENTION Electrostatic discharge can damage integrated circuits or semiconductors if you touch backplane connector pins Follow these guidelines when you handle the module Touch a grounded object to discharge static potential Wear an approved wrist strap grounding device Do not touch the backplane connector or connector pins Do not touch circuit components inside the module f available use a static safe work station When not in use keep the module in its static shield bag Publication 1771 6 5 130 May 1999 2 2 Installing the Thermocouple Millivolt Input Module Understand Compliance to If this product has the CE mark it is approved for installation within European Union Directives 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 EN 50081 2EMC Generic Emission Standard Part 2 Industrial Environment EN 50082 2EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use i
76. tions of the rung are true the block transfer read enable bit 07 is set in the output image data table control byte The output image table control byte contains the read enable bit and the number of words to be transferred The output energize instruction is defined as follows e indicates that it is an output instruction e indicates the I O rack address e indicates the module group location within the rack e 07 indicates this is a block transfer read operation if this were a block transfer write operation 07 would be replaced by 06 Rungs 2 and 3 These output energize instructions 012 01 and 012 02 define the number of words to be transferred This is accomplished by setting a binary bit pattern in the module s output image table control byte The binary bit pattern used bits 01 and 02 energized is equivalent to 6 words or channels and is expressed as 110 in binary notation Publication 1771 6 5 130 May 1999 Block Transfer Mini PLC 2 and 2 20 Processors Rung Summary Once the block transfer read operation is complete the processor automatically sets bit 07 in the input image table status byte and stores the block length of the data transferred Figure D 1 Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors Only 010 Data Table 07 oe image Table es Byte a R 017 027 030 Timer Counter Accumulated 060 Values Area 065 110 112
77. to 0 Temperature scale bit when set reports temperature in F when reset C The module ignores this bit for millivolt inputs Module Configuration 4 7 Word Description Word 1 bits 11 12 Format bits tell the module which format to use for reporting input cont values to the processor 4 digit BCD EN 0 2 s complement binary EM 1 Signed magnitude binary 0 Select the format used by your processor bits 13 17 Real time sample interval bits determine the sample time for updating module inputs You select sample time in 0 1 second intervals using binary code All values between 0 1 and 3 1 seconds in 0 1 second intervals are available We tabulated some values for you Sampie Timp pure EEK 0 1 1 EEA pues e ENE NNNM ME 0 7 1 1 MENTI 2005 529 1 5 1 1 1 a 2 0 1 2 5 1 1 1 878 3 0 1 1 1 _ Word 2 bits 00 07 Channel alarm enable bits tell the module which channel alarm values are activated Set bit 00 for alarm s in channel 1 and set alarm s in words 4 low alarm and 5 high alarm Repeat the procedure for setting alarms in channels 2 thru 8 bits 01 07 and words 6 19 respectively bits 10 17 Not used set to 0 Word 3 bits 00 07 Low alarm polarity bits tell the module the sign of the values that you enter in low alarm words set for negative reset for positive Bits 00 07 represent word
78. use module damage degradation of performance or injury Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation fas Short circuit unused pins fx Channel 1 Connect positive thermocouple leads to even numbered terminals negative leads to odd numbered terminals Ground cable shield to chassis mounting bolt Important The sensor cable must be shielded The shield must e extend the length of the cable but be connected only at the 1771 I O chassis extend up to the point of termination The shield should extend to the termination point exposing just enough cable to adequately terminate the inner conductors Use heat shrink or another suitable insulation where the wire exits the cable jacket 10527 1 Publication 1771 6 5 130 May 1999 2 6 Installing the Thermocouple Millivolt Input Module Cable Lengths Recommended maximum cable length for voltage mode input devices is 50 feet due to possible signal degradation and electrical noise immunity in typical industrial environments Grounding When using shielded cable wire ground the foil shield and drain wire only at one end of the cable We recommend that you wrap the foil shield and drain wire together and connect them to a chassis mounting bolt grounding stud or chassis single point grounding point Use heat shrink tubing to seal the exit point of the wires At the opposite en

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