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Rockwell / Allen-Bradley 1771-IXHR User Manual

1. 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 Appendix Thermocouple Restrictions Commercial iron undergoes a magnetic transformation near 769C and lt 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 ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type J commercial thermocouples be 2 2 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 thermoco
2. Programming Sample Programs for the Input Module PLC 3 Family Processors 2 sss sca ceeds PLC 5 Family Processors Thermocouple Restrictions Extracted from NBS Monograph 125 IPTS 68 Generali Purpose of Manual Audience Vocabulary Manual Organization Chapter Chapter Using This Manual This manual shows you how to use your High Resolution 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 or the IXHR 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 brief overview of the topics covered in that chapter Topics Covered Overview of the Input Module Description of th
3. Due to the number of digits required for high resolution readings the 1771 module only reads input values in 2 s complement binary Since the PLC 2 family PLCs do not naturally read this data format the IXHR module is not recommended for use with PLC 2 family programmable controllers 4 1 Chapter 4 Module Programming PLC 3 Program Example 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 block 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 4 1 and described below Figure 4 1 PLC 3 Family Sample Program Structure BTR ENABLE BLOCK XFER READ Block Transfer RACK XXX Read Done Bit GROUP X f MODULE X XXXX DATA XXXX XXXX LENGTH X CNTL XXXX XXXX Block Transfer BT Pushbutton wy Done Bit
4. Chapter Objectives p de as eke es Reading Data from the Module Bit Word Descriptions Chapter Summary Module Chapter Objective Peer bobs Tools and Equipment Calibrating your Input Module About Auto calibration Performing Auto calibration Performing Manual Calibration Chapter Summary 2 gt p lele emis T gt gt gt Cc 1 ET m 1 BERERE C 1G AB nh e e 1 qv we sm um N LI ret aa e E E 1 co Table of Contents Troubleshooting daw Chapter Objective ess Diagnostics Reported by the Module Troubleshooting with the Indicators Status Reported by the Module Chapter Summary 4 pne ens x Specifications RII High Resolution Thermocouple Millivolt Input Module Accuracy Lead Resistance Compensation
5. 1mV 11111111 decimal equivalent 1 Zoom center 70mV minimum 10111010 decimal equivalent 70 Only used in millivolt mode with Z 1 Millivolt data will be 1 resolution with range of 30 000mV Zoom will be used to center the range of interest between 70mV Over and underrange bits will be asserted outside of the display range For decimal equivalent values from 71 to 127 and 71 to 128 the zoom center will default to 0 Table 5 F Example Filter Values for Word 3 Bit Setting 15 08 or 07 00 0000000 00000001 00000010 11111111 Filter values increase increments of 25msec Filter Value No filter Tau 50ms Tau 75ms Tau 6 4 seconds Chapter Summary In this chapter you learned how to configure your module s hardware condition your inputs and enter your data 5 8 Chapter Objectives Reading Data from the Module 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 6 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 During normal operation when a bl
6. 5 2 pecifications High Resolution Thermocouple Millivolt Input Module Accuracy 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 Table A A and Table A B at ambient temperature 25 C and over the temperature range 0 609 Use the calibration procedure in Chapter 7 to adjust your module to compensate for your specific environment Table A A Thermocouple Range Accuracy Based on Temperatures Above 0 C Thermocouple Temperature 0 G0 C Temperature 25 C or F F 32 140 F E 270 to 1000 0 50 C 0 90 F 0 0400 K 270 to 1380 0 52 C 0 94 F 0 0640 R 50 to 1770 1 14 C 2 00 F 0 0914 5 50 to 1770 1 12 C 2 01 F 0 0926 1 Type E J T and S error is specified from 0 C 32 F to the maximum range of the thermocouple Type B is specified from 600 C to maximum range Error does not include thermocouple or lead error see appendix F and page A 3 Table A B Millivolt Range Accuracy Millivolt Max Error Calibration 2 Range Temperature 259C Millivolt Drift 100 to 100 Normal mode 8 85UV 8 856UV C 100 to 100 Zoom mode 5 78UV 43 8561 V oC Table A C Radiated Noise Susceptibility Radiated Noise Susceptibility Error 300 1000MHz Circular Wave Field Strength 10V M 4196 Lead Resistance
7. Thermocouple Millivolt Input Module This chapter gives you information on features of the input module how input module communicates with programmable controllers The High Resolution 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 Note Use with PLC 2 family programmable controllers is not recommended The 1771 IXHR module is only available with 2 s complementary binary as its only data type The PLC 2 family does not use 2 s complementary binary 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 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 25ms The 1771 IXHR module senses up to 8 differential analog inputs and converts them to values compatible with Allen Bradley programmable controllers T
8. 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 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 thermocouples below OC The recommended upper temperature limit for continuous use of protected thermocouples 1482C applies to AWG 24 0 5mm wire T Copper vs Copper Nickel lt Constantan gt Type Thermocouple The homogeneity of most Type TP and TN or EN thermoelements is reasonably good H
9. Compensation Filtering Appendix A Specifications 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 10uV of error Source Impedance Compensation for Millivolt Inputs Source resistance causes similar errors to occur with millivolt inputs If source resistance 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 Error offset calibration counts Rs 15M ohms Where R 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 Vin 2Vns 22V Internal Error 2Vns Module Circuitry N Vo To maintain a display error of lt 5uV at Vin OV Rs should be lt 341 ohms Refer to NBS 125 Thermocouple Reference Tables for determining actual thermocouple voltage versus temperature readings Hardware 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 Software A first order prog
10. WI 1771 6 5 80 10526 1 Chapter Summary In this chapter you read about the functional aspects of the input module and how the module communicates with programmable controllers 2 3 Installing the High Resolution Thermocouple Millivolt Input Module Chapter Objectives This chapter gives you information on calculating the chassis power requirement choosing the module s location in the I O chassis keying a chassis slot for your module wiring the input module s field wiring arm installing the input module Before You Install Your Input Before installing your input module in the I O chassis you must Module Action required Refer to Calculate the power requirements of all modules in each chassis Power Requirements Determine where to place the module in the I O chassis Module Location 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 Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins Guard against electrostatic damage by observing the following warning CAUTION Electrostatic discharge can degrade performance or cause permanent damage Handle the module as stated below Wear an approved wrist strap grounding device when handling the module Touch a grounded object to rid yourself of electrostatic charge before handling
11. 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 0 4 Multiply the difference between your observed value and 0 000 by 3 0933 Determine the magnitude and sign of the required correction With zoom 1 divide the difference by 3 2328 You can adjust the correction up to 127 binary counts 410 56 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 15 08 for channel 1 7 6 Terminal Identification Terminal Function 18 Input 1 lead 17 Input 1 lead 16 Input 2 lead 15 Input 2 lead 14 Input 3 lead 13 Input 3 lead 12 Input 4 lead 11 Input 4 lead 10 Not Used 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 Chapter 7 Module Calibration For example if the 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 bit
12. Word Definition Word 13 Auto calibration word Btoo Offset calibration complete bit Biton Gancaraioncomeebt Save to EEPROM bit Not used EEPROM fault bit Bit 07 Calibration fault bit Bis 08 15 08 15 Uncalibrated channel bits Chapter Summary In this chapter you learned the meaning of the status information that the input module sends to the processor 6 3 Module Calibration Chapter Objective In this chapter we tell you how to calibrate your module Tools and Equipment To calibrate your module you will need the following tools and equipment Description Model Type Available from or equivalent Tool or Equipment Precision Voltage Source Industrial Terminal and Programming terminal for Cat 1770 T3 or Cat No Allen Bradley Company Interconnect Cable family processors 1784 145 T47 T50 etc Highland Heights OH Calibrating your Input The high resolution thermocouple millivolt input module is shipped already Module 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 BTWs to the module and the processor can read inputs from the module Calibration can be accomplished using either of two methods auto calibratio
13. arm as shown in Figure 7 1 Figure 7 1 Shorting Inputs for Offset Calibration Terminal Identification Terminal Function 18 Input 1 lead incu 17 Input 1 lead Shorting link 16 Input 2 lead Repeat for each channel 15 Input 2 lead 14 Input 3 4 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 10530 1 3 After the connections stabilize about 10 seconds request the offset calibration by setting bit 00 in block transfer write word 28 and sending a block transfer write BTW to the module Refer to Table 7 A When the BTW is sent all channels are calibrated to 0 000mV 7 2 Chapter 7 Module Calibration Table 7 A Write Block Transfer Word 28 Word Bit Inhibit Calibration on Channel Requested Auto Calibration Word 28 Set these bits to Requested Requested 7 5 3 2 1 0 Save Requested Requested inhibit Values GainCal Offset Cal NOTE Normally all channels are calibrated simultaneously bits 08 15 of word 28 are octal 0 To disable calibration on any channel set the corresponding bit 08 through 15 of word 28 To disable the clamp inhibit function set bit 06 4 Queue block tran
14. describe Block Transfer programming Sample programs in the PLC 3 and 5 processors Module scan time issues Your module communicates with 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 Refer to chapter 5 to see the 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
15. generate analog signals that are transmitted to the module Figure 2 1 Communication Between Processor and Module 2 6 alll User Program 2 To Output Devices High Resolution PC Processor Thermocouple Millivolt PLC 5 40 Shown Input Module 1771 IXHR 12933 1 3 The module converts analog signals into binary format and stores these values until the processor requests their transfer 2 2 Chapter 2 Overview of the High Resolution Thermocouple Millivolt Input Module 4 When instructed by your ladder program the processor performs 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 the data if valid before it is written over by the transfer of new data in a subsequent transfer 7 Your ladder program should allow write block transfers to the module only when enabled by the operator at power up Accuracy The accuracy of the input module is described in Appendix A Getting Started Your input module package contains the following items Please check that each part is included and correct before proceeding High Resolution Thermocouple Millivolt Input Module Cat No 1771 IXHR User s Manual Input Module Field Wiring Arm User s Manual 1771 IXHR Cat No 1771
16. keying bands shipped with each I O chassis for keying the I O slot to accept only this type of module The input modules are slotted in two places on the rear edge of the circuit board The position of the keying bands on the backplane connector must correspond to these slots to allow insertion of the module You can key any connector in an I O chassis to receive these modules except for the leftmost connector reserved for adapter or processor modules Place keying bands between the following numbers labeled on the backplane connector Figure 3 1 Between 20 and 22 Between 24 and 26 You can change the position of these bands if subsequent system design and rewiring makes insertion of a different type of module necessary Use needlenose pliers to insert or remove keying bands Figure 3 1 Keying Positions 3 2 Connecting Wiring Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Keying Bands Upper Connector 14288 Module uses the same keying slots as the 1771 IXE Thermocouple Millivolt Input Module If you are replacing a 1771 IXE with a 1771 IXHR the ladder program must be modified to accept the new block transfer format CAUTION The High Resolution Thermocouple Millivolt Input Connect your I O devices to the 1771 WI field wiring arm shipped with the module see Figure 3 2 Attach the field wiring arm to the pivot bar at the bottom of the I O chassis The field wiring arm pivots up
17. may occur Type T thermoelements are not well suited for use in nuclear environments since both thermoelements are subject to significant changes in composition under thermal neutron irradiation The copper in the thermoelement is converted to nickel and zinc Because of the high thermal conductivity of Type TP thermoelements special care should be exercised in the use of the thermocouples to insure that both the measuring and reference junctions assume the desired temperatures ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type T commercial thermocouples be 2 percent between 101 and 59C 8 between 59 and 93C and 3 4 percent between 93 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 C 5 2 3 Bit Word descriptions 1771 IXE 5 6 Block transfer programming 4 1 Block transfer read 6 1 bit word descriptions 1771 IXE 6 2 BTR word assignments 1771 IXE 6 1 C Calibration channel offset 1771 IXE 7 5 pr
18. out bit is set in the 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 missed 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 25 milliseconds msec to 3 1 seconds in increments of 25msec Refer to Table 5 B below for a sampling of actual bit settings Note that the default mode of operation is implemented by placing all zeroes in bits 09 through 15 Table 5 B Bit Settings for the Real Time Sample Mode Decimal Bits 15 14 13 12 11 10 09 Sample Time Period 0 Inhibited 1 1 1 1 0 0 0 eae Important Use decimally addressed bit locations for PLC 5 processors Each channel has high and low alarm values associated with it These bits and words are explained in the bit word definitions in Table 5 D You have the ability to calibrate this module using auto calibration or by manually setting the individual channel words Words 20 through 27 in the configuration word Table 5 D are the manual calibration words for channels 1 5 3 5 Module Configuration through 8 respectively Word 28 activates the auto calibration feature Calibration is explained in chapter 7 Configuration Block for a The complete configuration block for the block transfer w
19. 3 Enter the data corresponding to your bit selection in words 0 through 4 B 1 Programming Examples WORD 00000 00004 00010 00014 00020 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 1 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 2 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 DATA MONITOR PROG OFF W03 0 NO EDITS NO FORCES RUNG RM000000 MEM PROT OFF 5 Press CANCEL COMMAND This returns you to the ladder diagram PLC 5 Family Processors 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 to figure 4 3 1 Enter the following rung BTW BLOCK XFER WRITE EN H RACK Power Up Bit GROUP DN MODULE CONTROL 0 HER DATA FILE LENGTH CONTINUOUS N7 60 is the address of the BTW transfer file 2 Pres
20. 4414 Bit 03 0 012207 802 0 006103519 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 keep the upper byte the same as it was from step 5 Chapter Summary Chapter 7 Module Calibration 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 for all channels 6 Ifthe correction changes the result in the wrong direction change the sign and reenter it Important If the correction required is larger than 0 19379 check your reference voltage If the reference voltage is correct perform auto calibration In this chapter you learned how to calibrate your input module 7 9 Chapter Objective Diagnostics Reported by the Module Troubleshooting We describe how to troubleshoot your module by observing LED indicators and by monitoring status bits reported to the pr
21. Accuracy 0 5 C Temperature Scale Selectable C or F Input Resolution 3 2328LV Display Resolution 0 19C 0 19F or 1 0uV 10u Input Isolation 1000V peak between inputs between input and common and between input and backplane connections Common Mode Rejection 120dB at 60Hz up to 1000V peak Common Mode Impedance Greater than 10 megohms Normal Mode Rejection 60dB at 60Hz over 100mV Input Overvoltage Protection 120V rms continuous Open Input Detection Open input produces an overrange in less than 10 seconds Input Connections 18 terminal wiring arm Cat No 1771 WI Data Format 2 s complement binary Calibration Methods Auto Auto calibration for offset and gain Manual Zero offset and gain adjustment for each channel via programming terminal Verify every six months for maintaining absolute accuracy Processor Compatibility PLC 3 or PLC 5 family processor using the 1771 1 0 structure and block transfer Not recommended for use with PLC 2 family processors Environmental Conditions Operating Temperature 0 to 60 C 32 to 140 F Rate of Change Ambient changes greater than 0 5 C per minute may temporarily degrade performance during periods of change Storage Temperature 40 to 85 C 40 to 185 F Relative Humidity 5 to 95 without condensation Backplane Power Consumption 750mA 9 5V 3 75 Watts maximum Field Wiring Arm Cat 1771 Keying Between 20 and 22 Between 24 and 26
22. BLOCK XFER WRITE RACK XXX Power up E MODULE X XXXX DATA LENGTH X CNTL Program Action At power up the user program examines the 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 Rungs 1 and 2 Rungs 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 until the pushbutton is used to request another block transfer write 4 2 Chapter 4 Module Programming After this single block transfer write is performed the module returns to continuous block transfer reads automatically 4 3 Chapter 4 Module Programming PLC 5 Program Example 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 separate control file must be selected for each of the BT instructions Refer to Appendix B Figure 4 2 PLC 5 Family Sample Program Structure BT BTR Enable BLOCK XFER READ 1 L RACK GROUP MODULE CONTROL XXX XX DATA FILE LENGTH XX CO
23. Looking for more information 5 Artisan 2 Visit us on the web at http www artisan scientific com for more information QUALITY INSTRUMENTATION GUARANTEED Price Quotations Drivers Technical Specifications Manuals and Documentation Artisan Scientific is Your Source for Quality New Certified Used Pre owned Equipment Tens of Thousands of In Stock Items Fast Shipping and Delivery Equipment Demos Hundreds of Manufacturers Supported Leasing Monthly Rentals Consignment Service Center Repairs InstraView Remote Inspection Experienced Engineers and Technicians on staff in our Remotely inspect equipment before purchasing with our State of the art Full Service In House Service Center Facility Innovative InstraView website at http www instraview com We buy used equipment We also offer credit for Buy Backs and Trade Ins Sell your excess underutilized and idle used equipment Contact one of our Customer Service Representatives today Talk to a live person 888 88 SOURCE 888 887 6872 Contact us by email sales artisan scientific com Visit our website http www artisan scientific com ALLEN BRADLEY wy High Resolution Thermocouple Millivolt Input Module Cat No 1771 IXHR User Manual M Important User Information Because of the variety of uses for this product and because of the differences between solid state products and electromechanical products those responsible for applying and using t
24. NTINUOUS N Pushbutton BTW Enable PLOK 2 EN RACK X GROUP X MODULE X Power up Bit CONTROL HER DATA 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 4 4 Module Scan Time Chapter Summary Chapter 4 Module Programming Scan time is defined as the amount of time it takes for the input module to read the input channels and place new data into the data buffer Scan time for your module is shown in Figure 4 3 The following description references the sequence numbers in Figure 4 3 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
25. apter Summary 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 has detected one or more of the following conditions as shown in Table 8 D Table 8 D Status Reported in Word 13 Word Bit Condition 13 6 The EEPROM could not be written Channel s could not be calibrated as indicated by bits 08 through 15 respectively Bit 08 channel 1 through bit 15 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 Specifications Number of Inputs 8 all of the same type or 4 each of 2 different types Chassis Location Any single I O module slot Type B Pt 30 Rh Pt 6 Rh 320 to 1800 C Type E chromel constantan 270 to 1000 C Type of Input Selectable Type J iron constantan 210 to 1200 C Type K chromel alumel 270 to 1380 C Type R Pt Pt 13 Rh 50 to 1770 C Type S Pt Pt 10 Rh 50 to 1770 C Type T copper constantan 270 to 400 C Millivolt 100 to 100 dc Thermocouple Linearization IPTS 68 standard NBS MN 125 Cold Junction Compensation Range 0 to 60 C
26. 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 Related Publications Chapter 1 Using This Manual Table 1 A Compatibility and Use of Data Table Use of Data Table Input Output Read Write Image Image Block Block Bits Bits Words Words A Compatible with 1771 A1 A2 A4 chassis B Compatible with 1771 A1B A2B A3B A4B chassis Yes Compatible without restriction No Restricted to complementary module placement Compatibilit Catalog p d Number Addressing Chassis 1 2 slot 1 slot 2 slot Series 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 input 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 50499 Chapter Objectives Module Description Features of the Input Module Chapter Overview of the High Resolution
27. calibration values are presented in Table 5 D Enter data into the BTW instruction after entering the instruction into your ladder diagram program Table 5 D Bit Word Definitions for the High Resolution Thermocouple Millivolt Input Module Word 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 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 Millivolt input B thermocouple E thermocouple J thermocouple thermocouple R thermocouple S thermocouple T 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 Enables X10 magnification when millivolt inputs have been selected Enabling this feature causes the BTR data to display 30 000mV around the value selected by word 2 Use the digital filter word 3 to stabilize the readings when using this mode Temperature scale bit when set reports temperature in F when reset in C The module ignores this bit for millivolt inputs 5 6 Chapter 5 Module Configuration Word Description bits 09 15 Real time sample interval bits determine the sampl
28. can be acknowledged When operated in the default mode RTS 00 a BTR will be released every 25 milliseconds When operated in RTS T BTR will be waived until T millseconds at which time 1 BTR will be released Figure 4 3 Block Transfer Time End of Block Module available Transfer to perform block Write transfer Block jou Configure 1st Scan 2nd Scan 3rd Scan Time Time 1 2 3 4 5 6 7 8 9 10529 1 Internal Scan time 25 25105 5011 7511 3 1sec In this chapter you learned how to program your programmable controller You were given sample programs for your PLC 3 and PLC 5 family processors You also read about module scan time 4 5 Chapter Objectives Configuring the Module 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 IXHR module type of input or two input types X10 magnification for millivolt data C or F real time sampling millivolt bias level zoom mode only i
29. e 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 Reported 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 8 B Table 8 B Status Reported in Word 1 Word Bit Explanation 1 00 Module is powered but has not received its first configuration block transfer The green LED is flashing 01 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 8 2 8 Troubleshooting Explanation The module s ambient temperature is below 0 C Temperature readings will be inaccurate The module s ambient temperature is above 60 C Temperature readi
30. e module including general and hardware features Module power requirements keying chassis location Wiring of field wiring arm Hardware and software configuration Module write block format Reading data from your module Module read block format How to calibrate your module Troubleshooting Diagnostics reported by the module Chapter 1 Using This Manual Chapter Topics Covered Appendix A Specifications Your module s specifications Appendix B Programming Examples Appendix C Thermocouple Characteristics Extractions from NBS Monograph 125 IPTS 68 Warnings and Cautions This manual contains warnings and cautions WARNING A warning indicates where you may be injured if you use your equipment improperly CAUTION 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 PLC 3 and PLC 5 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
31. e time for updating module inputs You select sample time in 0 025 second intervals using binary code All values between 0 025 and 3 1 seconds in 0 025 second intervals are available We tabulated some values for you cont Zoom center value for channels 1 4 These values are used when millivolt inputs have been selected and bit 07 of word 1 has been set to enable zoom 1uV display resolution Enter a value 2 s complement binary format ranging from 70mV to 70mV The displayed range will then be 30 000mV around the selected value displayed in 1uV increments Refer to Table 5 E bits 08 15 Zoom center value for channels 5 8 These values are used when millivolt inputs have been selected Enter a value 2 s complement binary format ranging from 70mV to 70mV The displayed range will then be 30 000mV around the selected value displayed in 11V increments Refer to Table 5 E bits 00 07 Filter values for channels 1 4 The filter operates on the display data only Alarms underrange and overrange operate in real time The filter constant is equal to TC 0 025 1 filter value Refer to Table 5 F bits 08 15 Filter values for channels 5 8 The filter operates on the display data only Alarms underrange and overrange operate in real time The filter constant is equal to TC 0 025 1 filter value Refer to Table 5 F Words 4 thru 19 Low and High channel alarm val
32. ed from NBS Monograph 125 IPTS 68 issued March 1974 on thermocouples B E J K R S and T B Platinum 30 Rhodium vs Platinum 6 Rhodium Type Thermocouples The ASTM manual STP 470 1970 indicates the following restrictions on the use of B type thermocouples at high temperatures They should not be used in reducing atmospheres nor in those containing metallic or nonmetallic vapors unless suitably protected wiht nonmetallic protecting tubes They should never be inserted directly into a metallic primary tube At temperatures below 450C the Seebeck coefficient of Type B thermocouples becomes quite small and is almost negligible in the normal room temperature range Consequently in most applications the reference junction temperature of the thermocouple does not need to be controlled or even known as long as it is between 0 and 50 Studies have shown that a 1 percent change in the Rhodium content of the Pt 3096 Rh thermoelement produces a corresponding change in the thermocouple voltage of about 15uV i e 1 3C at 1500C In contrast a change of only 01 in the Rhodium content of Pt 6 Rh thermoelement also produces a voltage change of about 15uV 1 3C at this temperature The thermoelectric voltages of Type B thermocouples is sensitive to their history of annealing heat treatment and quenching Calibration of Type B wires above 1600C is undesirable in most circumstances ASTM Standard 230 72 in the A
33. his module s features include 8 input channels configurable for thermocouple input ranges or millivolt input ranges Types B 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 scaling to selected temperature range in C or F temperature resolution of 0 19C or 0 1 F millivolt resolution to 1 microvolt user selectable high and low temperature alarms all features selectable through programming 2 1 Chapter 2 Overview of the High Resolution Thermocouple Millivolt Input Module 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 programmable filters for each group of 4 inputs X10 magnification zoom for millivolt mode How Analog Modules The processor transfers data to and from the module using BTW block transfer Communicate with write and BTR block transfer read instructions in your ladder diagram Programmable Controllers 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 2 1 1 The processor transfers your configuration data and calibration values to the module using a block transfer write instruction 2 External devices
34. his product must satisfy themselves as to the acceptability of each application and use of this product For more information refer to publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control The illustrations charts and layout examples shown in this manual are intended solely to illustrate the text of this manual Because of the many variables and requirements associated with any particular installation Allen Bradley Company cannot assume responsibility or liability for actual use based upon the illustrative uses and applications No patent liability is assumed by Allen Bradley Company with respect to use of information circuits equipment or software described in this text Reproduction of the contents of this manual in whole or in part without written permission of the Allen Bradley Company is prohibited Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances WARNING Tells readers where people may be hurt if procedures are not followed properly CAUTION Tells readers where machinery may be damaged or economic loss can occur if procedures are not followed properly Warnings and Cautions Identify a possible trouble spot Tell what causes the trouble Give the result of improper action Tell the reader how to avoid trouble Important We recommend you frequently backup your applicati
35. 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 C 3 Appendix Thermocouple Restrictions C4 alters the calibration They should also not be used in atmospheres that promote green rot corrosion those with low but not negligible oxygen content ASTM Standard 230 72 the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for Type K commercial thermocouples be 2 2 between 0 and 277C and 3 4 percent between 277 and 1260C Limits of error are not specified for the Type thermocouples below Type K thermocouples can also be supplied to meet special limits of error which are equal to one half the standard limits of error given above The recommended upper temperature limit for protected Type K thermocouples 1260C applies for AWG 8 3 3mm wire For smaller wires it decreases to 1093C for AWG 14 1 6mm 982C for AWG 20 0 8mm and 871C for AWG 24 or 28 0 5 or 0 3mm R Platinum 13 Rhodium vs Platinum and Platinum 10 Rhodium vs Platinum Type Thermocouples The ASTM manual STP 470 1970 indicates the following restrictions on the use of S and R type thermocouples at high temperatures
36. l 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 zoom 0 2 Apply 0 000 millivolts to the channel input as shown in Figure 7 3 7 5 Chapter 7 Module Calibration Figure 7 3 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
37. n manual calibration The auto calibration method is recommended since it is easier and less time consuming than manual calibration Manual calibration can be used if you are more familiar with this type of calibration or if you desire to compensate for thermocouple or lead error About Auto 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 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 7 1 Chapter 7 Module Calibration Performing Auto calibration Calibration of the module consists of applying 0 000mV across each 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
38. ngs will be inaccurate Not used 07 EEPROM calibration constants could not be read The module will continue to operate but readings may be inaccurate 08 15 Not used 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 troubleshooting with your industrial terminal Bits 00 07 and 08 15 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 8 C Table 8 C Status Reported in Words 2 and 3 Word Condition 2 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 Inputs overrange Bit 08 is channel 1 bit 15 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 08 15 Corresponding channel input value has exceeded the alarm value that you entered for that channel 8 3 Chapter 8 Troubleshooting 8 4 Ch
39. nnual Book of ASTM Standards 1972 specifies that the standard limits of error for Type B commercial thermocouples be 1 2 percent between 871 and 1705C Limits of error are not specified for Type B thermocouples below 871C The recommended upper temperature limit for protected thermocouples 1705C applies to AWG 24 0 5mm wire E Nickel Chromium vs Copper Nickel lt Constantan gt Type Thermocouple Type E thermocouples are recommended by the ASTM Manual 1970 for use in the temperature range from 250 to 871C in oxidizing or inert atmospheres C 1 Appendix Thermocouple Restrictions C 2 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 t
40. nput filtering alarming calibration Configure your module for its intended operation by means of your programming terminal and write block transfers 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 the 1771 will respond with a default value of 27 This module is permanently configured to accept and report data in 2 s complementary binary format only It is not recommended for use with PLC 2 family programmable controllers 5 1 5 Module Configuration Input Type The thermocouple millivolt input module accepts the following types of inputs Table 5 A Types of Inputs Temperature Bits Input Type m Type Range C 5 04 03 02 00 Miot Milivot Millivolt 10000 100 to 100 eee 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 bit
41. nsfer write BTW to the module Refer to Table 7 A When the BTW is sent all channels are calibrated to 100 00mV NOTE Normally all channels are calibrated simultaneously bits 08 15 of word 28 are octal 0 To disable calibration on any channel set the corresponding bit 08 through 15 of BTW word 28 3 Queue BTRs to monitor for gain calibration complete and any channels which may not have calibrated successfully 74 Performing Manual Calibration Chapter 7 Module Calibration Save Calibration Values If any uncalibrated channel bits bits 08 15 of BTR 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 The module can be run with the new calibration values but will lose them on power down save these values proceed as follows 1 Request save to EEPROM by setting bit 02 in BTW word 28 and sending the BTW to the module Refer to Table 7 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 actua
42. nts 3 1 Module Location in the I O Chassis 3 2 Module 3 2 Connecting Wiring 3 3 Grounding the Input Modules 3 4 Installing the Input Module 3 6 Interpreting the Indicator Lights 3 6 Chapter Summary 37 Table of Contents Module Programming Chapter 5 Block Transfer PLC 2 Applications PLC 3 Program Example PLC 5 Program Example Module Scan Time Module Configuration Chapter 5 Configuring the Input Type ZOOM FOGG Temperature Scale Real Time Sampling Seed Channel Alarms s odd Calibration pM Configuration Block for a Block Transfer Write Bit Word Descriptions Chapter Summary Module Status and Input Data
43. o nickel and zinc ASTM Standard E230 72 in the Annual Book of ASTM Standards 1972 specifies that the standard limits of error for the Type E commercial thermocouples be 1 7C between 0 and 316C and 1 2 percent between 316 and 871C Limits of error are not specified for Type E thermocouples below OC Type E thermocouples can also be supplied to meet special limits of error which are less than the standard limits of error given above 1 25C between 0 and 316C and 3 8 percent between 316 and 871C The recommended upper temperature limit for protected thermocouples 871C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decreases to 649C for AWG 14 1 6mm 538C for AWG 20 8mm and 427C for AWG 24 or 28 0 5 or 0 3mm J Iron vs Copper Nickel lt Constantan gt Type Thermocouple The J thermocouple 15 the least suitable for accurate thermometry because there are significant nonlinear deviations in the thermoelectric output from different manufacturers The total and specific types of impurities that occur in commercial iron change with time location of primary ores and methods of smelting 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
44. ocedure for 1771 IXE 7 5 tools 7 1 Communication how data is transferred 2 2 Compatibility use of data table 1 3 Configuring your module 1771 IXE features 5 1 configuration block 1771 IXE 5 4 D Diagnostic indicators 3 6 Diagnostics indicators 8 1 reported by module 8 1 F Field wiring arm module specific 3 3 Filtering A 3 G Grounding 3 4 Index K Keying your module 3 2 Module installation 3 6 Module location 3 2 P Power requirements 3 1 Pre installation considerations 3 1 Programming example PLC 3 4 2 PLC 5 44 R Real time sampling 5 2 bit settings 5 3 S Scan time 4 5 Specifications Thermocouple Millivolt input module 1771 IXE A 1 T Thermocouple Millivolt input module features 2 1 Troubleshooting table 1771 IXE 8 2 W Wiring connections 1771 IXE 3 3 ALLEN BRADLEY U ROCKWELL INTERNATIONAL COMPANY With offices in major cities worldwide WORLD EUROPE MIDDLE HEADQUARTERS EAST AFRICA Allen Bradley HEADQUARTERS 1201 South Second Street Allen Bradley Europa B V Milwaukee WI 53204 USA Amsterdamseweg 15 Tel 414 382 2000 1422 AC Uithoorn Telex 43 11 016 The Netherlands FAX 414 382 4444 Tel 31 2975 60611 Telex 844 18042 FAX 31 2975 60222 Publication 1771 6 5 80 April 1991 As a subsidiary of Rockwell International one of the world s largest technology companies Allen Bradley meets today s challenges
45. ocessor At power up the module momentarily turns on both indicators as a lamp test then checks for correct RAM operation EPROM operation EEPROM operation a valid 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 they occur in every transfer of data to the PC processor Monitor the green and red LED indicators and status bits in word 1 of the BTR file when troubleshooting your module Figure 8 1 LED Indicators Green RUN Indicator Red Fault FLT Indicator 10528 1 8 1 Chapter 8 Troubleshooting Troubleshooting with the Table 8 A shows LED indications and probable causes and recommended Indicators actions to correct common faults Table 8 A Troubleshooting Chart for the 1771 IXHR Input Module Indication Probable Cause Recommended Action Both LEDs are OFF No power to module Check power to I O chassis Cycle as necessary Possible short on the module Replace module LED driver failure 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 modul
46. ock transfer length of zero 0 is programmed the 1771 IXHR will respond with a default length of 12 Table 6 A BTR Word Assignments for the 1771 IXHR Input Module Decimal Bit 15 14 13 12 11 10 9 7 6 5 3 2 1 o 1 Not used Status Codes Inputs overrange Inputs underrange Inputs gt high alarm Inputs low alarms 2 3 4 Channel 1 input 5 Channel 2 input 6 Channel 3 input 11 Channel 8 input 12 Cold Junction Temperature in C or F 13 Inhibits 1 Cold junction temperature is provided 0 19C or 0 1 F resolution The filter time constant Tau for this value is fixed at 6 4 seconds Auto calibration request 6 1 Chapter 6 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 6 B Table 6 B Bit Word Description for the 1771 IXHR Input Module Word Definition Word 1 Power up bit is set to indicate that the module is waiting for its first write block transfer Out of range bit is set if one or more channel inputs are above or below the range for which you configured the module 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 0 C o
47. of industrial automation with over 85 years of practical plant floor experience More than 13 000 employees throughout the world design manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality productivity and time to market These products and services not only control individual machines but integrate the manufacturing process while providing access to vital plant floor data that can be used to support decision making throughout the enterprise ASIA PACIFIC CANADA LATIN AMERICA HEADQUARTERS HEADQUARTERS HEADQUARTERS Allen Bradley Hong Kong Allen Bradley Canada Allen Bradley Limited Limited 1201 South Second Street Room 1006 Block B Sea 135 Dundas Street Milwaukee WI 53204 USA View Estate Cambridge Ontario NIR Tel 414 382 2000 28 Watson Road 5X1 Telex 43 11 016 Hong Kong Canada FAX 414 382 2400 Tel 852 887 4788 Tel 519 623 1810 Telex 780 64347 FAX 519 623 8930 FAX 852 510 9436 P N 955109 64 Printed in USA Looking for more information 5 Artisan 2 Visit us on the web at http www artisan scientific com for more information QUALITY INSTRUMENTATION GUARANTEED Price Quotations Drivers Technical Specifications Manuals and Documentation Artisan Scientific is Your Source for Quality New Certified Used Pre owned Equipment Tens of Thousands of In Stock Items Fast Shipping and Delivery Eq
48. on programs on appropriate storage medium to avoid possible data loss 1991 Allen Bradley Company Inc PLC is a registered trademark of Allen Bradley Company Inc Table of Contents Important User Information i Using This Manual 1 1 Purpose of Manual aaau n 1 1 21 1 Vocabulary 21 1 Manual Organization 1 1 Warnings and Cautions 1 2 Related Products 1 2 Product Compatibility 1 2 Related 5 1 3 Overview of the High Resolution Thermocouple Millivolt Input Module 2 1 Chapter 5 2 1 Module Description 2 1 Features of the Input Module 2 1 How Analog Modules Communicate with Programmable Controllers 2 2 ACCUTACY WI ee Pr 2 3 Getting Started 2 3 Chapter Summary 2 3 Installing the High Resolution Thermocouple Millivolt Input Module Rh nara 3 1 Chapter Objectives ERR 34 Before You Install Your Input Module 3 1 Electrostatic Damage 3 1 Power Requireme
49. onnecting a jumper wire between the positive and negative input terminals of each unused channel Refer to appendix to determine maximum cable length Grounding the Input Modules When using shielded cable or shielded thermocouple extension 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 Figure 3 3 At the opposite end of the cable tape exposed shield and drain wire with electrical tape to insulate it from electrical contact 34 Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Figure 3 3 Cable Grounding als Ground Shield at chassis mounting bolt J A Shield and drain twisted into single strand Field Wiring Arm 17798 Refer to Wiring and Grounding Guidelines publication 1770 4 1 for additional information 3 5 Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Installing the Input Module When installing your module in an I O chassis 1 First turn off power to the I O chassis WARNING Remove power from the 1771 I O chassis backplane and wiring arm before removing or installing an I O module Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation Failure to remove power f
50. owever 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 thermocouples This together with the high thermal conductivity of Type TP thermoelements is the major reason why Type Appendix Thermocouple Restrictions 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 of Type T thermocouples in hydrogen atmospheres at temperatures above about 370C is not recommended since severe embrittlement of the Type TP thermoelements
51. r 32 0 F High cold junction temperature bit is set when the cold junction temperature exceeds 60 0 C or 140 0 F Dynamic clamp bit Prevents rapid changes in data due to data corruption over the opto isolation barrier as a result of ESD radiation bursts etc 0 feature active 1 feature inhibited EEPROM calibration values could not be read Bits 08 15 Not used Word2 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 08 15 Overrange bit for each channel is set to indicate an input is out of range bit 08 for channel 1 thru bit 15 for channel 8 Also set for open channel detection Word3 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 BTW word 4 6 8 10 12 14 16 or 18 bit 00 for channel 1 thru bit 07 for channel 8 Bits 08 15 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 BTW word 5 7 9 11 13 15 17 or 19 bit 08 for channel 1 thru bit 15 for channel 8 Words 4 11 Input for channel 1 through 8 respectively in 0 1 C or 0 1 F resolution for temperature and 10uV or 11V resolution for millivolts Word 12 Cold junction temperature in 0 1 C or 0 1 F 6 2 Chapter 6 Module Status and Input Data
52. rammable filter is also available Filter time constants range from 0 disabled to 255 6 4 seconds A 3 Sample Programs for the Input Module PLC 3 Family Processors Appendix Programming Examples The following are sample programs for entering data in the configuration words of the write block transfer instruction when using the 3 or PLC 5 family processors Following is a sample procedure for entering data in the configuration words of the write block transfer instruction when using a PLC 3 processor For a complete sample program refer to Figure 4 2 To enter data in the configuration words follow these steps Example Enter the following rung for a write block transfer BTW BLOCK XFER WRITE LN E RACK 12 Power Up Bit CNTL MODULE 1 HIGH DATA 15 LENGTH CNTL CNTL om F0003 0000 1s the address of the write block transfer data file You want to enter examine word 1 1 Press SHIFT MODE to display your ladder diagram on the industrial terminal 2 Press DD 03 0 ENTER to display the block transfer write file The industrial 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
53. rite to the module is Block Transfer Write defined in Table 5 C below Table 5 C Configuration Block for the High Resolution Thermocouple Millivolt Input Module Block Transfer Write Word 1 Sample Time 2 Zoom Value for Group 2 Channels 5 8 Zoom Value for Group 1 Channels 1 4 E OE Channel 1 Low Alarm Value 5 Channel 1 High Alarm Value 6 Channel 2 Low Alarm Value 7 Channel 2 High Alarm Value 8 Channel 3 Low Alarm Value 9 Channel 3 High Alarm Value 10 Channel4 Low Alarm Value E E Channel 4 High Alarm Value 12 Channel 5 Low Alarm Value 13 Channel 5 High Alarm Value 14 Channel 6 Low Alarm Value 15 Channel 6 High Alarm Value 16 Channel 7 Low Alarm Value wv Channel 7 High Alarm Value 00000000 38 Channel 8 Low Alarm Value 19 Channel 8 High Alarm Value 20 Calibration Values for Channel 1 21 Calibration Values for Channel 2 22 Calibration Values for Channel 3 23 Calibration Values for Channel 4 Calibration Values for Channel 7 27 Calibration Values for Channel 8 28 Auto calibration Request Word 5 4 Chapter 5 Module Configuration E enable bit for input types refer to bit word description T temperature scale bit refer to bit word description Z zoom enable 0 normal 10 1 X10 1uV 5 5 5 Module Configuration Bit Word Descriptions Bit word descriptions of BTW file words 1 thru 3 configuration 4 thru 19 channel alarm values and 20 thru 27
54. rom the backplane or wiring arm could cause module damage degradation of performance or injury 2 Place the module in the plastic tracks on the top and bottom of the slot that guides the module into position 3 Do not force the module into its backplane connector Apply firm even pressure on the module to seat it properly 4 Snapthe chassis latch over the top of the module to secure it 5 Connect the wiring arm to the module Interpreting the Indicator The front panel of the input module contains a green RUN and a red FLT fault Lights indicator Figure 3 4 At power up the green and red indicators are on An initial module self check occurs If there is no fault the red indicator turns off The green indicator will blink until the processor completes a successful write block transfer to the module If a fault is found initially or occurs later the red FLT indicator lights Possible module fault causes and corrective action are discussed in Chapter 8 Troubleshooting Figure 3 4 Diagnostic Indicators TC MV Module RUN FLT LII 10528 1 3 6 Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Chapter Summary 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 3 7 Chapter Objectives Block Transfer Programming PLC 2 Applications Module Programming In this chapter we
55. s F8 F5 and enter N7 60 to display the configuration block The industrial terminal screen should like Figure B 3 B 2 Programming Examples Figure B 3 Sample PLC 5 Data File Hexadecimal Data Address 0 1 2 3 4 5 6 7 8 9 60 5008 0046 007F 8EB8 7148 8EB8 7148 8EB8 7148 8EB8 70 7148 FE70 0352 70 0352 FE70 0352 FE70 0352 0000 N7 80 0000 0000 0000 0000 0000 0000 0000 The above data file would configure the module as follow K thermocouples on inputs 5 8 millivolt inputs on channels 1 4 temperature scale of Celsius zoom enabled for channels 1 4 real time sampling set to a 1 second scan rate zoom center set to 70mV 46H 70D filter time constant 6 4 seconds for channels 1 4 all channel alarms ON low alarm values for channels 1 4 set 29 000mV 70mV 41 000mV high alarm values for channels 1 4 set to 29 000mV 70mV 99 000mV low alarm values for channels 5 8 set to 40 09C high alarm values for channels 5 8 set to 85 0 C all user calibration values set to 0 Note Put data file in decimal format to view addresses 61 through 78 3 Enter the data corresponding to your bit selections and add alarm and calibration values if so desired 4 ESC returns you to the main menu B 3 General Appendix Thermocouple Restrictions Extracted from NBS Monograph 125 IPTS 68 Following are some restrictions extract
56. s Set this bit for 2 different for input type input types see table 5 D Zoom Feature The zoom feature word 2 can be enabled when millivolt inputs are used This feature allows you to view 30mV in 1UV increments around a selected value ranging from 70 to 70mV Temperature Scale The temperature scale reported by the module is selected by setting bit 08 in the configuration word When bit 08 is set 1 the temperature is reported in degrees Fahrenheit When reset 0 the temperature is reported in degrees Celsius The temperature bit 08 is ignored when the millivolt input type is selected Real Time Sampling 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 5 2 Channel Alarms Calibration Chapter 5 Module Configuration 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
57. s 15 08 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 7 4 Applying 100 000 for Gain Calibration Apply 100 000mV Wiring Arm 10533 1 Cat 1771 WI 7 7 Chapter 7 Module Calibration 7 8 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 correction 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 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 02
58. sfer reads BTRs to monitor for offset calibration complete and any channels which may have not calibrated successfully Refer to Table 7 B Table 7 B Read Block Transfer Word 13 Word Bit E 14 E 11 10 07 06 os 04 E 02 01 00 Uncalibrated Channels Auto Calibration Status Word 13 EEPROM Save to Gain Cal Offset Cal 8 7 5 3 2 Faut Faut Complete Complet 3 a Complete vompere 5 Proceed to Gain 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 7 2 7 3 Chapter 7 Module Calibration Figure 7 2 Applying 100 00mV for Gain Calibration Terminal Identification Terminal Function 18 Input 1 lead 17 Input 1 lead 16 Input 2 lead 15 Input 2 lead 14 Input 3 lead 13 Input lead 12 Input 4 lead 11 Input 4 lead 10 Not Used 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 100 000 Wiring Arm Cat No 1771 WI 10531 1 2 After the connections stabilize about 10 seconds request the gain calibration by setting bit 01 in BTW word 28 and sending a block tra
59. the module Handle the module from the front away from the backplane connector Do not touch backplane connector pins Keep the module in its static shield bag when not in use or during shipment Power Requirements Your module receives its power through the 1771 I O chassis backplane from the chassis power supply The maximum current drawn by the thermocouple millivolt input module from this supply is 750mA 3 75 Watts 3 1 Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Add this value to the requirements of all other modules in the I O chassis to prevent overloading the chassis backplane and or backplane power supply Module Location in the Place your module in any slot of the I O chassis except for the extreme left slot Chassis This slot is reserved for processors or adapter modules Group your modules to minimize adverse affects from radiated electrical noise and heat We recommend the following Group analog 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 addressing This module uses a byte in both the input and output image tables for block transfer After determining the module s location in the I O chassis connect the wiring arm to the pivot bar at the module s location Module Keying Use the plastic
60. ues that you enter via the terminal in 2 s complementary binary 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 Alarms are disabled by setting the low alarm equal to the high alarm If the zoom feature is enabled the alarm values should be the difference between the actual alarm limit and zoom center value in word 2 Refer to the example PLC 5 program in chapter 5 5 7 5 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 08 15 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 Word 28 Auto calibration request word used to automatically calibrate selected channels and save the calibration constants in EEPROM Refer to Chapter 7 Table 5 E Example Zoom Settings for Word 2 Zoom Settings Bit Settings 15 08 or 07 00 Zoom center 70mV maximum 01000110 decimal equivalent 70 Zoom center OmV 00000000 decimal equivalent 0 Zoom center
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62. uples 760C applies to AWG 8 3 3mm wire For smaller wires the recommended upper temperature decrease to 593C for AWG 14 1 6mm and 371C for AWG 24 or 28 0 5 or 0 3mm t should be noted that the Constantan element of Type 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 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 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 continuous use at temperatures within the range 250 to 1260C in oxidizing or inert atmospheres Both the KP and the KN thermoelements are subject to oxidation when used in air above about 850C but even so Type K thermocouples may be used at temperatures up to about 1350C for short periods with only small changes
63. ward and connects with the module so you can install or remove the module without disconnecting the wires Connect inputs in successive order starting with channel 1 positive leads to even numbered terminals negative leads to odd numbered terminals of the wiring arm Make connections to channel 1 at wiring arm terminals 18 4 and 17 Follow the connection label on the side of the module for connecting the remaining inputs Figure 3 2 3 3 Chapter 3 Installing the High Resolution Thermocouple Millivolt Input Module Figure 3 2 Connection Diagram for the 1771 IXHR Inputs Terminal Identification Terminal Function 18 Input 1 lead 17 Input 1 lead L IX 09 Channel 1 16 Input 2 lead EZ 15 Input 2 lead I LT XC 09 Channel 2 14 Input 3 lead 13 Input 3 lead 12 Input 4 lead 11 Input 4 lead E 10 Not Used Do not use 9 Not used C 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 Short circuit 1 Input 8 lead unused pins Connect positive thermocouple leads to even numbered terminals negative leads to odd numbered terminals Ground cable shield to chassis mounting bolt Wiring Arm Cat 1771 WI 10527 1 Do not connect an input to terminals 9 and 10 They are reserved for the cold junction temperature sensor inside the wiring arm Short circuit unused input terminals by c

Rockwell / Allen-Bradley 1771-IXHR User Manual

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