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1771-6.5.91, Isolated Analog Input Module, User Manual

1. Keying Bands ATTENTION Insert or remove keying bands with your fingers Upper Connector 110224 4 Place the module in the plastic tracks on the top and bottom of the slot that guides the module into position 5 Do not force the module into its backplane connector Apply firm even pressure on the module until it is firmly seated in the chassis Note The chassis locking bar will not close if all modules are not seated properly 6 Snap the chassis locking bar or locking latch on earlier chassis over the top of the module to secure it Make sure the locking pins on the locking bar are fully engaged 7 Connect the wiring to the module as explained under Connecting Wiring below Connect your input devices to the cat no 1771 WF wiring arm shipped with the module Attach the wiring arm to the pivot bar at the bottom of the I O chassis It pivots upward and connects with the module so you can install or remove the module without disconnecting the wires Connect inputs to the 1771 IL B module as shown in Figure 2 3 This module is shipped from the factory configured for voltage inputs but can be configured for any combination of current and voltage inputs If you want to change the configuration refer to Setting the Voltage Current Selection Jumpers as explained earlier in this chapter Important The module confi
2. and 01 as follows Table 4 A Bit Settings for Voltage or Current Inputs Bit 01 Bit 00 Voltage or current input 0 1to5V DC 4to 20 mA 0 0to 5 V DC 0 to 20 mA 1 0 5 to 45 V DC 20 to 20 mA 1 10 to 10 V DC 0 to 10 V DC 1 Current input mode selected by configuration plug 2 Configurable using bipolar scaling The 1771 IL B has 16 bit resolution across the 10V range For compatibility purposes the default scaling for all ranges is 12 bits 0 4095 or 4095 This allows the series B module to be directly interchangeable with the series A module To use the full 16 bit capability scaling values must be changed Refer to Scaling later in this chapter Table 4 B shows the incremented voltage or current assigned to each bit for the seven different input ranges For example if the channel 1 input range is 0 to 5V and the actual incoming signal is at mid range 2 5V the value in the module s data word if using default scaling would be 0000 1000 0000 0000 binary or 2048 decimal The input default scaling is 2048 4096 or 1 2 of full scale 4 2 Nominal Voltage or Current Range 1 to 5V 0 to 5V 5 to 5V 10 to 10V 0 to 20mA 4 to 20mA 20 to 20mA Chapter 4 Module Configuration Table 4 B Input Voltage and Current Ranges for the Analog Input Module Default Scaling Data from Voltage or BCD Output Range A D Converter Current Per Bit 0000 to 4095 3063 to 15316 0 33mV 0000 to 4095 32768
3. save calibration values to EEPROM was successfully completed Bits 03 05 Notused Word 15 Bit 06 EEPROM Fault EF When this bit is set the calibration values could not be saved to EEPROM Calibration Fault CF When this bit is set the module could not perform offset or gain calibration This bit is set when a save is requested Calibration Inhibited Each bit represents a channel that was not calibrated bit 08 Bits 08 15 10 channel 1 bit 09 11 channel 2 and so on This bit is set either due to an 10 17 error or a user request If the channel was requested not to be calibrated these bits confirm that request Chapter Summary In this chapter you learned how to interpret the status indicators status words and troubleshoot your input module 7 5 Specifications Appendix Inputs per module 8 fully isolated differential Module Location 1771 1 0 rack 1 slot Input voltage ranges nominal Input current ranges nominal Resolution Accuracy Linearity Repeatability Isolation Voltage Input overvoltage protection Unscaled BCD and binary output data to the processor Input impedance Common mode rejection Common mode impedence Normal mode rejection 1 to 45V DC 0 to 5V DC 5 to 5V DC 10 to 10V DC 4 to 20mA 0 to 420mA 20 to 20mA 16 bit binary over full range Voltage Typical 0 01 of full scale range 25 C Maximum 0 05 of full scale range 25 C Curr
4. Chapter 6 Module Calibration 4 After the connections stabilize request the offset calibration by setting bit 00 in block transfer write word 37 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 0 00000V Table 6 A Write Block Transfer Word 28 Decimal Bit 00 Octal Bit 00 Word 37 Requested Requested Requested Save Gain Cal Offset Cal Values NOTE Normally all channels are calibrated simultaneously decimal bits 08 15 octal bits 10 17 of word 37 are 0 To disable calibration on any channel set the corresponding bit 08 through 15 decimal or 10 through 17 octal of word 37 5 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 Decimal Bit 15 14 13 12 n fio foo ob 07 06 os 04 03 02 01 00 Octal Bit UU 15 ia fis fiz n 10 07 06 05 04 03 02 01 00 Uncalibrated Channels Auto Calibration Status Cal EEPROM save Gain Cal Fault Fault Not used EEPROM Complete Complete Complete Reset bit 00 0 requested offset calibration Word 13 7 Proceed to Gain Calibration below 6 3 Chapter 6 Module Calibration Gain Calibration Calibrating gain requires that you apply 10 00000V across each input channel To calibrate the gain of an inp
5. also insure that only one block Storage MODULE ADDR RGS I transfer read or write is enabled during BitB PUE LENGTH xx m DONE a particular program scan on Rungs 6 and 7 These rungs are the conditioning block Power up Storage BTW transfer rungs Include all the input Bit BitB BLOCK XFER WRITE conditioning shown in the example 7 _ DATA ADDR Xxx ENABLE program MODULE ADDR RGS LEN storage BLOCK LENGTH XX xe BIA FILE XXXX XXXX DONE 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 PLC 3 Programming Program Action At power up the user program enables a block transfer read Then it initiates a block transfer write to configure the module Thereafter the program continuously performs read and write block transfers Chapter 2 Communicating With Your Module Block transfer instructions with the PLC 3 processor use one binary file in a data table section for module location and other related data This is the block transfer control file The block transfer data file stores data that you want transferred to your module when programming a block transfer write or from your module when programming a block transfer read The address of the block transfer data files are stored in the block transfer control file The industrial terminal prompts you to create a control file when
6. channel 1 word 14 ofthe BTR will be set Words 23 Bits 00 15 thru 36 00 17 Low and high alarm values for channels 2 thru 8 4 12 Chapter 4 Module Configuration Decimal Bit n Octal Bit Description Ez ca Word Offset Calibration bit When this bit is set 1 offset calibration is to be performed When set no other calibration function bits can be set Default is 0 no offset calibration Gain Calibration bit When this bit is set 1 gain calibration is to be performed When set no other calibration function bits can be set Default is 0 no gain calibration Word 37 Bit 02 Save calibration values When this bit is set 1 new calibration values will be saved in EEPROM Default 0 values not saved Bits 03 07 Not used Bits 08 15 Inhibit Channel Calibration When this bit is set 1 that particular channel 10 17 will not be calibrated Default 0 all channels to be calibrated Chapter Summary In this chapter you learned how to configure your module s hardware condition your inputs and enter your data 4 13 Module Status and Input Data Chapter Objectives In this chapter you will read about s reading data from your module a block transfer read data format Reading Data From Your Block transfer read programming moves status and data from the input Module module to the processor s data table in one I O scan Figure 5 1 The processor s user program initiates the request to tran
7. initiated every I O scan 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 1s stored in word 130 100g above the data address s Output Energize Instruction 012 07 enables the block transfer read operation If all conditions 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 0 indicates that it is an output instruction 1 indicates the I O rack address 2 indicates the module group location within the rack 07 indicates this is a block transfer read operation if this were a block transfer write operation 07 would be replaced by 06 Appendix D Block Transfer Mini P LC 2 and PLC 2 20 Processors D 2 Output Image Table Timer Counter Accumulated Values Area mekaar 1 8 9 m Preset Values Area Multiple GET Instructions Rungs 2 and 3 These output energize instructions 012 01 and 012 02 define the number of words to be transfer
8. 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 The Isolated Analog Input Module 1771 IL B is shipped with each channel set for voltage mode If a milliamp input is desired you must set a jumper on the functional analog block FAB for that particular channel To set the selection jumpers for your desired inputs proceed as follows 1 Remove the module s left hand cover plate the one without the labels 2 Locate the selection plugs Figure 2 1 3 Position the jumpers as shown in Figure 2 1 for your particular module 4 Reassemble the module after you have finished checking and or setting the selection plugs Chapter 2 Installing the Input Module Figure 2 1 Configuration Jumper Settings for 1771 IL B Inputs Voltage Current Jumper Functional Analog Block r Channel 1 Channel 2 Channel 3 L Channel 4 Channel 5 Jumper in J umper in Channel 6 Current position Voltage position Channel 7 Channel 8 Edge View TT enlarged Side View T 2 3 Chapter 2 Installing the Input Module Installing the Analog Module To install your module in an I O chassis 1 First turn off power to the I O chassis backplane and disconnect the cable from the module before ATTENTION Remove power from the 1771 I O chassis removing or installing an I O module Failure t
9. l COUNTER ADDR xx LE Block transfer read buffer the file to file POSITION move instruction holds the block transfer read BTR data file A until the id aian XXX XXX DONE processor checks the data integrity If the FILE R XXXX XXXX DN data was successfully transferred the RATE PER SCAN XXX processor energizes the BTR done bit initiating a data transfer to the buffer file Storage R for use in the program If the data is Pushbutton 1 BitA corrupted during the BTR operation the 2 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 po tt Block Transfer Write Storage Done Bit Pushbutton 1 BitA E ty 1 Block Transfer Write Storage Done Bit 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 reconfigures the module Block transfer writes will continue foras long as the 5 pushbutton remains closed Block Transfer Read Power up Storage Done Bit Bit BitB E BTR BLOCK XFER READ Rungs 4 and 5 Power up Storage BTR Done These rungs provide a read write read Bit BitA Bit ENABLE sequence to the module at power up VES D Ss DATA ADDR XXX EN They
10. module You must be able to program and operate an Allen Bradley programmable controller to make efficient use of your input module In particular you must know how to program block transfers We assume that you know how to do this in this manual If you do not refer to the appropriate programming and operations manual for your programmable controller before you attempt to program this module In this manual we refer to the 1771 IL series B analog input module as the input module or the 1771 IL B the Programmable Controller as the controller This manual is divided into seven chapters The following chart shows each chapter with its corresponding title and a brief overview of the topics covered in that chapter Chapter Title Topics Covered Description of the module including general and 1 Overview of the input module hardware desire Module power requirements keying chassis 2 Installing the module location Wiring of the field wiring arm 3 Communicating with your Reading data from your module module Sample programs Hardware and software configuration 4 Configuring your module Input range selection Data format 5 Module status and input data Reading data from the module 6 Calibrating your module Information on calibrating your module 7 Troubleshooting Troubleshooting guide for problem diagnosis P 1 Preface Using This Manual Appendix Topics Covered A Specifications B Configuratio
11. module is using RTS and a block transfer read has not occurred within the programmed RTS period Invalid Filter bit IF is set if the filter parameters are not correct The value must be between 00 and 99 0 00 and 0 99 seconds in BCD or 0 and 255 0 to 2 55 in binary Invalid Alarm bit IA is set if any alarm value is unusable such as expecting BCD and value is in 2 5 complement binary Hardware Failure bit HF is set if the analog module has an internal hardware failure Such as fuse blown or open etc Alarm violation status bit A is set if one or more channels are in an alarm condition Notused ndividual underrange bits for each channel Bit 00 for channel 1 bit 01 for channel 2 etc Notused ndividual overrange bits for each channel Bit 00 for channel 1 bit 01 for channel 2 etc Not used Polarity sign bits are set when the inputis less than zero in both BCD and signed magnitude data formats Bit 00 for channel 1 bit 01 for channel 2 etc Not used Input data values Word 5 for channel 1 word 6 for channel 2 etc Chapter 5 Module Status and Input Data Decimal Bit D korc Octal Bit Description Low Alarm bits for channels 1 through 8 respectively Each bit yd represents an alarm indicator for that channel When the bit is set the i value of that channel is below the low alarm value Word 13 Bits 08 15 10 17 Not used Bits 00 07 High Alarm bits for channels 1 through 8 res
12. specify a binary value equal to the number of words to be transferred For example Figure D 2 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 Bit 06 is used when block transfer write operations are required Figure D 2 Setting Block Length Multiple GET Instructions only Block Transfer Read 6 Words Read Enable Bit from Module For Block Transfer Active Operations Only PE Image TRUE cone yte Contains Rea 012 Enable Bit and Block Length in Binary Code 027 Data Address 030 Contains Module Address in BCD Binary Bit Pattern Number of Words Lower Output Image Table Byte toTransfer e ow wu m n 00 Default 0 009 0 09 0 0 9 9 9 9 9 1 2 C Ee ee 0 yt i 29 0 0 T 1 9 9 0 1 E SE 1 0 D 3 A alarms overrange underrange B BCD format 1 3 bit settings voltage or current input block transfer 1 1 2 2 3 1 write 4 5 block transfer read word assignments block transfer write 3 2 BTR format bit word descriptions 5 2 C Calibration tools 6 1 communication configuration default 4 10 configuration block 4 10 bit word descriptions 4 12 configuration BTW configuring your module 4 1 connecting wiring 2 5 D
13. to 15316 0 33mV 4095 to 4095 15316 to 15316 0 33mV 4095 to 4095 30632 to 30632 0 33mV 0000 to 4095 0 to 15316 0 0013mA 0000 to 4095 3063 to 15316 0 0013mA 4095 to 4095 15316 to 15316 0 0013mA Note Voltage and current input ranges are selectable on a per channel basis Block Transfer Write Format To get the same resolution available from the A D converter scale each channel as shown in Table 4 C Table 4 C Scaling Endpoints Voltage Current Minimum Maximum Range Scaling Endpoint Scaling Endpoint 1 to 5V 15316 4 to 20mA 15316 0 to 5V 15316 0 to 20mA 15316 5 to 5V 15316 20 to 20mA 15316 10 to 10V 30632 30632 0 to 10V 30632 30632 You select the format to enter values in the block transfer write table Bit 08 10 octal of BTW word 2 sets the parameters for scaling high and low alarms and the digital filter constant Decimal Bit 08 In Octal Bit 10 BTW Data Format You must enter all values in 0 BCD default BCD 1 Two s Complement Binary Two s Complement Binary 4 3 Chapter 4 Module Configuration Data Format Digital Filtering 4 4 You must also indicate what format will be used to read data from your module Typically BCD is selected with PLC 2 processors and 2 s complement binary is selected with PLC 3 and PLC 5 processors See Appendix C for details on data format Table 4 D Selecting the Data Format Decimal Bit 10 Decimal Bit 09 Octal Bit 12 Octal Bit 11 Dat
14. to install your input module in an existing programmable controller system and how to wire to the field wiring arm 2 8 Chapter Objectives Block Transfer Programming Communicating With Your Module In this chapter we describe block transfer programming quick start sample programs in the PLC 2 PLC 3 and PLC 5 processors module scan time issues Your module communicates with your processor through bidirectional block transfers This is the sequential operation of both block transfer read BTR and block transfer write BTW instructions A configuration BTW is initiated when the analog module is first powered up and subsequently only when the programmer wants to enable or disable features of the module The configuration BTW sets the bits which enable the programmable features of the module such as scaling alarming real time sampling etc Block Transfer reads are performed to retrieve information from the module Subsequent BTWs occur 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 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
15. 0 through 07 of word 3 of the block transfer write instruction If an invalid digital filter value is entered i e 1F BCD the invalid filter value bit in the block transfer read status area will be set If an invalid digital filter value is entered the module will not perform digital filtering If you choose to use the digital filtering feature the filter time constant value chosen will apply to all input signals The real time sampling RTS mode of operation provides data gathered at precisely timed intervals for use by the processor Use RTS for time based functions such as PID and totalization in the PLC RTS 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 T 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 the end of the next RTS period a time 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 next BTR 4 5 Chapter 4 Module Configuratio
16. ALLEN BRADLEY wy Isolated Analog Input Module Cat No 1771 IL Series B User Manual M Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout this manual we make notes to alert you t
17. NALOG INPUT Green RUN Indicator Red FLT fault Indicator 10528 1 7 1 Chapter 7 Troubleshooting 28 Troubleshooting with the Table 7 A shows indications probable causes and recommended actions to Indicators correct common faults Table 7 A Troubleshooting Chart for the Isolated Analog Input Module 1771 IL series B Indication Both RUN and FLT are OFF RUN Red FLT indicator ON and Green RUN indicator is ON FLT C7 RUN O Red FLT indicator ON RUN 1 Green RUN indicator is ELT O flashing Probable Cause Recommended Action Check power to I O chassis Recycle as No power to module necessary Possible short on the module LED driver failure Replace module icroprocessor oscillator or EPROM failure f immediately after power up indicates RAM or EPROM failure f during operation indicates possible Replace module microprocessor or backplane interface failure Hardware failure blown fuse etc Powerup diagnostics successfully completed Normal operation If indicator continues to flash and write block transfers BTW cannot be accomplished you Replace module 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 ap
18. a Format 0 not used 1 Fo two s complement binary 1 signed magnitude binary The analog input module has hardware based high frequency filters on all channels to reduce the effect of electrical noise on the input signal Software digital filtering is meant to reduce the effect of process noise on the input signal The digital filter equation is a classic first order lag equation Figure 4 1 Using a step input change to illustrate the filter response Figure 4 2 you can see that when the digital filter constant time elapses 63 2 of the total response is reached Each additional time constant achieves 63 2 of the remaining response Figure 4 1 Digital Filter Equation At X Yon Y Yn 1 n inl B Hed At TA Where Y n present output filtered peak voltage PV Yq 1 previous output filtered PV Z t module channel update time seconds TA digital filter time constant seconds X present input unfiltered PV Real Time Sampling Chapter 4 Module Configuration Figure 4 2 Digital Filter Lag Equation Illustration 100 0 Hs a s di 2 P 6 fe 2 EEG INE eee PA l l Amplitude PT d I a l AM oLT r l l Unfiltered Input TA 20 01 sec l TA 0 5sec Ta n TA 20 99 sec 0 0 01 0 5 0 99 Time in Seconds 16723 Digital filter time constant values of 00 BCD to 99 BCD 0 00 to 2 55 binary 00 no filter are set in bits 0
19. 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 RACK XXX GROUP X MODULE X XXXX DATA XXXX XXXX LENGTH 00 CNTL XXXX XXXX Enable Block Transfer Read Done Bit Block Transfer Write Done Bit BTW BLOCK XFER WRITE y RACK 2 GROUP X MODULE X XXXX XXXX XXXX DATA LENGTH 00 CNTL XXXX XXXX 3 3 Chapter 3 Communicating With Your Module PLC 5 Programming Program Action At power up the program enables a block transfer read rung 1 Then it examines the power up bit in the BTR file and 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 the processor mode will not initiate a block transfer write 3 4 The PLC 5 program is very similar to the PLC 3 program with the following exceptions 1 Block transfer enable bits are used instead of done bits as the conditions on each rung 2 Separate block transfer control files are used for the block transfer in
20. ample bit 04 represents input channel 5 The module sets a bit 1 to indicate it has detected an alarm condition Refer to Table 7 D Table 7 D Status Reported in Words 13 and 14 Decimal Bit E DIG Octal Bit Description Bits 00 07 Low Alarm bits for channels 1 through 8 respectively Each bit Word 13 00 07 represents an alarm indicator for that channel When the bit is set the value of that channel is below the low alarm value Bits 00 07 High Alarm bits for channels 1 through 8 respectively Each bit Word 14 represents an alarm indicator for that channel When the bit is set the 00 07 value of that channel is above the high alarm value 7 4 Chapter 7 Troubleshooting Status Reported in Word 15 Design your program to monitor status bits in word 15 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 7 E Table 7 E Status Reported in Word 15 Decimal Bit vel Octal Bit Description Offset Calibration Complete O When this bit is set the offset calibration request BED was successfully completed Gain Calibration Complete G When this bit is set the gain calibration request BM was successfully completed Bit 02 Save Complete S When this bit is set the
21. ata for an Isolated Analog Input Module cat no 1771 IL series B Address N10 00 N10 10 N10 20 N10 30 N10 40 N10 50 N10 60 N10 70 N10 80 N10 90 N10 100 N10 110 N10 120 N10 130 N10 140 The block transfer read starts at N10 00 The block transfer write starts at N10 70 B 2 Appendix Data Table Formats 4 Digit Binary Coded The 4 digit BCD format uses an arrangement of 16 binary digits to represent a Decimal BCD 4 digit decimal number from 0000 to 9999 figure C 1 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 represent a number from 0 to 9 The place values for each group of digits are 29 21 22 and 23 Table C A 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 0X 22 0 0X2 0 1X2 1 0X2 0 0X 2 0 1X2122 0X 20 0 0X23 0 0X22 0 1X2 2 3 1X 29 1 1X 23 8 0X 22 0 0x2120 f Dots of of of a of of af of of of 1 af af of of 1 o ee y 1 2 3 9 12955 1 A ppendix C Data Formats C 2 Signed magnitude Binary Two s Complement Binary Table C A BCD Representation Decimal Equivalent Place Value 23 8 22 4 2 2 20 1 0 0 0 0 0 0 0 1 1 Signed magnitude binary is a means of communicating nu
22. be set at one time To completely calibrate the module three BTWs must be sent one for each offset gain and save operations 6 1 Chapter 6 Module Calibration Performing Auto calibration 6 2 Calibration of the module consists of applying 0 00000V across each input channel for offset calibration and 10 00000V across each input channel for gain correction ATTENTION Verify that each channel s configuration jumper is set to the voltage mode refer to Setting the Voltage Current Selection Jumpers in chapter 2 Failure to do so can damage the module Offset Calibration Normally all inputs are calibrated together To calibrate the offset of an input proceed as follows 1 Verify that each channel has its jumper set for voltage mode Refer to Setting the Voltage Current Selection Jumper in chapter 2 Check the position of the jumper on each channel Apply power to the module Connect shorting links or apply 0 00000V across each input channel on the 1771 WF field wiring arm as shown in Figure 6 1 Figure 6 1 Shorting Inputs for Offset Calibration Terminal Identification 18 17 16 15 14 13 12 11 10 9 KA KA WA UDONDO Cat No 1771 WF Channel1 T Shorting link Repeat for each channel Channel 2 Channel 3 Short each input Channel 4 or apply 0 00000V across each input channel Not used Channel 5 Channel 6 Channel 7 Channel 8 Apply 0 00000V Wiring Arm 10530 1
23. damage Handle the module as ATTENTION Electrostatic discharge can degrade stated below a Wear an approved wrist strap grounding device or touch a grounded object to rid yourself of electrostatic charge before handling 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 2 1 Chapter 2 Installing the Input Module Power Requirements Module Location in the I O Chassis Setting the Voltage Current Selection Jumpers 2 2 Your module receives its power through the 1771 I O power supply The Isolated Analog input module requires 1 2A at 5V from the power supply 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 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 programmable controller processors or adapter modules Group your modules to minimize adverse affects from radiated electrical noise and heat We recommend the following a Group analog input and low voltage dc modules away from ac modules or high voltage dc modules to minimize electrical noise interference a 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
24. data formats 2 s complement binary C 2 4 digit binary coded decimal C 1 signed magnitude binary C 2 default configuration 4 10 description of module Diagnostics indicators 7 1 reported by module 7 1 E electrostatic discharge 2 1 F features 1 1 field wiring arm D 5 filtering 4 4 G grounding indicator lights 8 input range selection 4 2 installation of module 2 4 K keying bands M module features 1 1 module installation module location in the I O chassis 2 2 N noise interference 2 2 P power requirements pre installation considerations programming with multiple GETs pa programming example ranges input voltage and current 4 3 real time sampling 4 5 RTS bit settings 4 6 II S scaling implementation 4 7 ranges 4 8 scan time specifications T Troubleshooting table 7 2 U update time 1 1 W wiring connections 2 6 PLC is a registered trademark of Allen Bradley Company Inc PLC 5 is a trademark of Allen Bradley Company Inc SLC is a trademark of Allen Bradley Company Inc ALLEN BRADLEY Allen Bradley has been helping its customers improve productivity and quality for 90 years A ROCKWELL INTERNATIONAL COMPANY A B designs manufactures and supports a broad range of control and automation products worldwide They include logic processors power and motion control devices man machine interfaces and
25. eee ee Performing Auto calibration L Chapter Summary sescessisasr isteneni ee ee e meme eee Chapter 7 Chapter Objective KA Era s dte det ente e ence RLRE Diagnostics Reported by the Module Status Reported by the Module Appendix A Specifications sacer eee bee a E a ee e oe Eo d A 1 Appendix B Sample Configuration of the Analog Input Module B 1 Appendix C 4 Digit Binary Coded Decimal BCD Signed magnitude Binary eee Two s Complement Binary 0 0 0c Appendix D Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors D 1 Setting the Block Length Multiple GET Instructions only D 3 Overview of the Input Module Chapter Objectives This chapter gives you information on features of the module a how the input module communicates with programmable controllers Module Descriptions The 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 slot module that requires no external power supply After scanning the analog inputs the input data is converted to a specified data type in a d
26. ent Typical 0 06 of full scale range 25 C Maximum 0 1 of full scale range 25 C Includes 0 05 when using internal current resistor 1 LSB 1 LSB 1000V peak channel to channel channel to ground for 1s voltage mode 140V ac rms continuous current mode 8V dc continuous 0000 to 4409510 for unipolar ranges 0 to 5V 1 to 5V 0 to 20mA and 4 to 20mA 409510 to 409519 for bipolar ranges 35V 10V 20mA input ranges gt 10 megohms for voltage ranges 250 ohms for current ranges 2120 db 60Hz and 1K ohm source imbalance gt 50 megohms shunted by lt 5 nF gt 120 db 60Hz Current Requirements 1 0A 5V from I O chassis backplane Open Circuit Detection Time to Detect Open Circuit Calibration Power Dissipation Thermal Dissipation Engineering units sent to processor Voltage mode Open input produces upscale reading Current mode Open input produces zero reading 10 seconds maximum Auto calibration offset and gain Zero offset and gain adjustment for each channel via programming terminal Verify every six months for maintaining absolute accuracy 6 5 Watts maximum 22 2 BTU hr maximum 9999 BCD with selectable scaling 432767 binary Continued on next page Appendix A Specifications A 2 Calibration Interval Internal scan rate Environmental conditions operational temperature Storage temperature relative humidity Conductors Wiring Category Keying Wir
27. every 50 milliseconds When operated in real time sample mode RTS T BTRs will be ignored by the module for T milliseconds at which time a single BTR will be allowed Chapter Summary In this chapter you learned how to program your programmable controller You were given sample programs for your PLC 2 PLC 3 and PLC 5 family processors You also read about module scan time 3 5 Chapter Objectives Configuring Your Input Module Configuring Your Module In this chapter you will read how to a configure your module s hardware a condition your inputs enter your configuration 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 Before continuing make sure you read Setting Voltage Current Selection Jumpers in chapter 2 The software configurable features available with the Isolated Analog Input Module 1771 IL series B are a input range selection a data format a digital filtering real time sampling a scaling to engineering units a high and low alarms Configure your module for its intended operation by means of your programming terminal and block transfer write BTW instructions Note Programmable contr
28. gh scale value to 150 this input channel will report data in psi For better resolution you can multiply both of the scaling values by the same multiplier as long as both scale values are in the range of 9999 BCD or 32767 binary By setting the low scale to 3000 and the high scale value to 15000 you would report data in units of 0 01 psi per count Maximum resolution can be obtained by setting the low scale value to 9999 in BCD and the high scale value to 9999 in BCD 32767 low and 32767 high in binary For example if in the 1 to 5V mode the scaling points are 1 and 5 volts If you set the scaling to 32767 the maximum the module will display will be 32767 If 5 1V is applied the display will be 32767 and the overrange bit for that channel will be set Note To achieve the 0 to 10V range you must use bipolar scaling Select the 10V range and scale for the actual intended range If you need 0 to 100 gpm set scaling values at 100 and 100 You will effectively be creating a 0 to 10V range that is scaled from 0 to 100 Implementing the Scaling Feature You implement the scaling feature by 1 Inserting minimum and maximum scaled values in the appropriate configuration words 2 If using BCD and any of the minimum or maximum values are negative set the appropriate sign bits in the minimum or maximum sign bit words 4 7 Chapter 4 Module Configuration 4 8 Scaling Ranges The maximum range of the scaling
29. guration jumpers must be set for either voltage or current before inserting the module into the I O chassis 2 5 Chapter 2 Installing the Input Module Figure 2 3 Wiring Connections for the Isolated Analog Input Module 1771 IL B Channel 1 Channel 2 8 5 n Channel 3 3 2 i 0 Analog Source Channel 4 Ground Channel 5 Channel 6 Channel 7 Pm WR UD YO io ES tJ 1L Channel 8 NOTE The 1771 IL B module does not supply loop power for loop powered analog sources transmitters transducers etc Loop power must be supplied by the user Field Wiring Arm Cat No 1771 WF 11846 I 2 6 Chapter 2 Installing the Input Module G rounding 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 Figure 2 4 At the opposite end of the cable tape exposed shield and drain wire with electrical tape to insulate it from electrical contact Figure 2 4 Cable Grounding Remove a length of cable Pull the foil shield and bare Twist the foil shield and drain Attach a ground lug from the Belden 8761 drain wire from the insulated wire together to form a single cable wires strand A Bare drain z
30. igital 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 Features This module senses up to eight analog signals at its inputs and converts them to a proportional four digit BCD or 16 bit binary value while providing channel to channel and channel to ground isolation of 1000V You can select from five voltage or three current input ranges Each input is software selectable on a per channel basis This module s features include a Eight software configurable differential inputs a User program selectable input ranges on a per channel basis see Table 1 A Selectable real time sampling Selectable scaling to engineering units Selectable digital filtering a 1000V input isolation channel to channel channel to ground Selectable high and low input alarms S Chapter 1 Overview of the Input Module How Analog Modules Communicate with Programmable Controllers Table 1 A Program Selectable Input Ranges Voltage Ranges Current Ranges 1 to 5V dc 4 to 20mA 0 to 5V dc 0 to 20mA 5 to 45V dc 20 to 20mA 10 to 10V dc 0 to 10V dc The processor transfers data to the module block transfer write BTW and from the module block transfer read BTR using BTW and BTR instructions in your ladder diag
31. ing Arm Specifications continued calibration should be checked at 6 month intervals to maintain specified accuracy 50 milliseconds for 8 channels 0 to 60 C 32 to 1400F 40 to 850C 40 to 1850F Operating 5 to 95 without condensation Non operating 5 to 80 without condensation 14 gauge stranded max 3 64 inch insulation max Category 21 between 10 and 12 between 32 and 34 Cat No 1771 WF 1 Refer to publication 1770 4 1 Programmable Controller Wiring and Grounding Guidelines Appendix Configuration Example Sample Configuration of the The following is a sample configuration for the 1771 IL series B isolated Analog Input Module analog input module Entering the data shown in Figure B 1 in the configuration words of the write block transfer data file will result in the following module setup Overall Module Functions Chosen Digital Filter Time Constant 0 5 seconds Data Format 2 s Complement Binary Real Time Sampling Rate 1 5 seconds Individual Channel Functions Chosen Input Scale Value Range Low High counts Chan 1000 5000 Chan 5000 1000 Chan 0000 5000 Chan 5000 0000 Chan 2500 2500 Chan 5000 5000 Chan 100 100 Chan 9999 9999 The above configuration for the 1771 IL B isolated analog input module would be set up using the following PLC 5 data table file Figure B 1 Appendix B Configuration Example Figure B 1 Sample PLC 5 Data File Hexadecimal D
32. ision Voltage Source 0 10V 1LLV resolution Analogic 3100 Data Precision 8200 Accuracy of better than 2mV or equivalent Industrial Terminal and Programming terminal for A B Cat No 1770 T3 or Cat No Allen Bradley Company Interconnect Cable family processors 1784 145 T47 T50 etc Highland Heights OH Calibrating your Input The analog input module is shipped already calibrated If it becomes Module 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 send data to the module BTW and the processor can read data from the module BTR Calibration is accomplished using a method called auto calibration About Auto calibration Auto calibration calibrates the input by generating offset and gain correction values and storing them in EEPROM in the module 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 37 is performed to the module any time after the module has been powered up it interrogates word 37 for a request for auto calibration The request can be for the following offset calibration gain calibration save operation save to EEPROM Note that only one bit may
33. m High Alarm Low Alarm High Alarm Low Alarm High Alarm Low Alarm High Alarm Low Alarm High Alarm Low Alarm High Alarm Low Alarm High Alarm Value Value Value Value Value Value Value Value Value Value Value Value Value Value Value Value Sign bits low alarm values Calibration bits 4 11 Chapter 4 Module Configuration Bit Word Descriptions for the Isolated Analog Input Module Configuration Block Note that decimal bits are shown Octal bits are shown in parentheses Decimal Bit D Word Octal Bit Description Bits 00 15 Input range selections grouped 2 bits for each channel allow selection of any Word1 00 17 of 7 input voltage or current ranges See Table 4 A Bits 00 07 Digital filter reduces effect of noise on the input See Digital Filtering BTW format bit This bit determines the format for scaling digital filter Bit 08 10 constant and high and low alarms Bit 08 10 2 0 Values must be entered in BCD Word 2 Bit 08 10 21 Values must be entered in Two s Complement Binary gr Data format is used to match format of processor See Table 4 D Bits 11 15 Real time sampling defaults to 50ms if zeroes are entered See Table 4 E 13 17 for other real time sample intervals Bits 00 07 Minimum sign bits when set designate minimum scaling values that are negative in BCD Default lt 0 positive Word 3 Bits 08 15 Maximum sign bits when set designa
34. mbers 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 101105 2249 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 O and negative if the sign bit is 1 Using the signed magnitude method 0 10110 22 1 10110 22 Two s complement binary is used with PLC 3 processors when performing mathematical calculations 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 2249 Appendix C Data Formats 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 i
35. municating With Your Chapter 3 Module Chapter Objectives isses nee chau eR aE AR Oso SR ER EE ae Block Transfer Programming PLC 2 Programming o cx eua e ER EE ARR E ARE R ERIS PLC 3 Programming sa 9 nee este edes denne R Rasen PLC 5 NT TTT Module Scan Time 22er RR RE ee T RR RR Rd Chapter Summary 2s cete ad eb vend erbe RU cag kic aie nee Configuring Your Module Chapter 4 Chapter Objectives scilicel trt EE e rh Kee Configuring Your Input Module Input Range Selection lsseleleeee eens Block Transfer Write Format 0 0 0 0c eee ee eee Data Format jc 90T ct pee tpit GAES coed be COR eee aS ESS Digital Filtering 2 0 cece cece cette mmn Real Time Sampling R 0 RR L R KR R N cece eee Scaling Voss ccs T rani ee E Raa RT RE eas ae Default Configuration s ccrorereiriererti yt ktt R RRR eee Chapter Summary o essers ditt TR H 00 EEE A RRR NNE ARRE A REE Table of Contents Module Status and Input Data Calibrating Your Module Troubleshooting Specifications Configuration Example Data Formats Block Transfer Mini PLC 2 and PLC 2 20 Processors Chapter 5 Chapter Objectives 0 R R RR RRR RRR RR III Reading Data From Your Module Chapter Summary soe es e Rer eee ee ee pe RR x Rc Reis Chapter 6 Chapter Objective iius cxt px Ge Um EA We EUG ER EXG peus Tools and Equipment a s a K a R a TK caiete I Calibrating your Input Module About Auto calibration lee
36. n Set appropriate bits in the BTW data file to enable the RTS mode You can select RTS periods ranging from 50 ms to 3 1 seconds in increments of 100ms for the 1771 IL B Refer to Table 4 E below for actual bit settings Note that the default mode of operation is implemented by placing all zeroes in bits 11 through 15 13 through 17 octal Table 4 E Examples of Bit Settings for the Real Time Sample Mode Decimal Bits Octal Bits Sample Time Period No RTS Default settings 50ms 100ms 200ms 300ms 400ms 500ms 600ms 700ms 800ms 900ms 1 0s 1 55 2 0s 2 55 1 pgg 3 05 E DO GDG 4 6 Scaling Chapter 4 Module Configuration Each channel has two scaling points low and high The signal value at these points is fixed For example the high scaling point of a 10V output channel always corresponds to an input signal equal to 10 000V To implement the scaling feature you insert the minimum and maximum scaled values in the appropriate configuration words The format of the scaling values is determined by the BTW format bit bit 08 word 2 The range in BCD format is 9999 The range in binary format is 32767 For example assume that at OmA the device connected to this input channel is producing 0 psi and at 20mA it produces 150 psi and the 1771 IL B range selected is 4 to 20mA Extrapolation indicates that at 4mA the device is producing 30 psi By setting the low scale value of the input to 30 and the hi
37. n Example Information on BCD 2s complement binary signed C Data Formats magnitude Block transfer with Mini P LC 2 D and PLC 2 20 processors How to use GET GET instructions 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 The 1771 IL series B module 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 I O image table use is an important factor in module placement and addressing selection The module s data table use is listed in Table P A Table P A Compatibility and Use of Data Table Use of Data Table Compatibility Catalog Addressin Number g Chassis Image Blocks Series 17714UB A B A Compatible with 1771 A1 A2 A4 B Compatible with 1771 A1B A2B A3B A4B Y Compatible without restriction P 2 Related Publications Preface Using This Manual You can place your input module in any I O module slot of the I O chassis You can put two inpu
38. n channel Underrange Bit is set Overrange Bit is set Range when the input signal is when the input signal is less than greater than 1 to 5V 4 to 20mA 5V dc or 20mA 0 to 5V 0 to 20mA 5V dc or 20mA 5 to 5V 20 to 20mA 5V dc or 20mA 10 to 10V 10V dc User defined alarms let the user specify a range of good input values If the input value goes outside of this range the module will set the low or high alarm bit for that channel The alarm values are written to the module in the same units as the scaling values Valid alarm values are 9999 BCD or 132767 binary If you select no alarms you must set both the low alarm value and the high alarm value to zero If either the low or high alarm for a channel is not zero alarms for that channel are enabled Figure 4 3 Alarm Example Overrange Limit alarm inactive alarm active User Defined High Alarm Limit Input Channel User Defined Low Alarm Limit Underrange Limit 4 9 Chapter 4 Module Configuration Default Configuration If a write block with all zeroes is written to the module the default selections will be a to 5V dc or 4 to 20mA depends on voltage current selection jumper a BCD data format a no real time sampling RTS a no digital filter a no scaling a no alarms Note Input data is set to 0 until an initial block transfer write is received by the m
39. ndication on any 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 troubleshooting with your industrial terminal Bits 00 07 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 Decimal Bit ME Word Octal Bit Description Individual underrange bits for each channel Bit 00 for channel 1 bit 01 for channel Word 2 Bits 00 07 2 etc 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 Word 3 Bits 00 07 Inputs overrange Bit 00 is channel 1 bit 07 is channel 8 If input connections and voltages are correct this status may indicate a hardware failure 7 3 Chapter 7 Troubleshooting Status Reported in Words 13 and 14 Design your program to monitor over under alarm 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 each represent an input for channels 1 8 respectively For ex
40. not work properly The analog input module will work with a default configuration of zeroes entered in the configuration block This results in the default settings of 1 to 5V dc or 4 to 20mA depending on voltage current selection jumper BCD data format no real time sampling RTS no digital filter no scaling and no alarms Refer to Chapter 4 for more information 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 the 1771 IL series B module to powerup and operate 3 1 Chapter 3 Communicating With Your Module PLC 2 Programming The PLC 2 program example regulates when each block transfer will be initiated to eliminate problems caused by limited regulation of bidirectional block transfers Both storage bits are needed as shown in the example to accomplish this task in all PLC 2 systems local or remote with long or short program scans Therefore the program as shown is the minimum required Note that PLC 2 processors that do not have the block transfer instruction must use the GET GET block transfer format which is outlined in appendix D Figure 3 1 PLC 2 Family Sample Program Structure Block Transfer R ead Program Action d MORE FILE TO FILE MOVE ENABLE Rung 1
41. o possible injury to people or damage to equipment under specific circumstances ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention helps you a Identify a hazard a Avoid the hazard a Recognize the consequences Important Identifies information that is especially important for successful application and understanding of the product Important We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss Summary of Changes Summary of Changes Summary of Changes This release of this publication contains new and revised information from the last release New Information This manual covers the series B version of the 1771 IL isolated input module The 1771 IL series B module has 16 bit resolution improved sample time and auto calibration Revised Information Many areas in this manual have been modified Change bars as shown to the right side of this paragraph are used to indicate new or revised information Every chapter in this manual has been revised Please read carefully S 1 Purpose of Manual Audience Vocabulary Manual Organization Preface Using This Manual This manual shows you how to use your Isolated Analog Input module with an Allen Bradley programmable controller It helps you install program calibrate and troubleshoot your
42. o remove power from the backplane could cause injury or equipment damage due to possible unexpected operation Failure to remove power from the backplane could cause module damage degradation of performance or injury locking bar pins n ak S3 front of chassis Lift the locking latch holding the module into the chassis On chassis equipped with a chassis locking bar pull the locking bar pins to release the locking bar and swing it up Ca 12453 3 Position the keying bands Figure 2 2 in the backplane connectors to correspond to the key slots on the module This prevents you from inserting the wrong module in this slot This analog module uses a between 10 and 12 a between 32 and 34 ATTENTION Observe the following precautions when inserting or removing keys a 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 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 2 4 Keying Band Location Between 10 and 12 Between 32 and 34 Connecting Wiring to Your Input Module Chapter 2 Installing the Input Module Figure 2 2 Keying Positions I O chassis L3
43. odule Figure 4 4 Word Assignments for the Isolated Analog Input Module 1771 IL series B Block Transfer Write Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Octal Bits Word 1 Data BTW 2 Real Time Sampling Format Format Beers EA 3 Sign bits maximum scaling values Sign bits minimum scaling values 4 Channel 1 minimum scaling 5 Channel 1 maximum scaling 6 Channel 2 minimum scaling 7 Channel 2 maximum scaling 8 Channel 3 minimum scaling 9 Channel 3 maximum scaling 10 Channel 4 minimum scaling 11 Channel 4 maximum scaling 12 Channel 5 minimum scaling 13 Channel 5 maximum scaling 14 Channel 6 minimum scaling 15 Channel 6 maximum scaling 16 Channel 7 minimum scaling 4 10 Decimal Bits Octal Bits 17 18 19 20 21 22 23 24 25 26 2 28 39 30 3l 32 33 34 35 36 GEER EES S G l 37 Inhibit bits for calibration DJ 15 14 13 12 11 10 09 08 07 17 16 15 14 13 12 11 10 07 Chapter 4 Module Configuration Channel 7 maximum scaling Channel 8 minimum scaling Channel 8 maximum scaling E E eee ee ee e Sign bits high alarm values Channel 1 Channel 1 Channel 2 Channel 2 Channel 3 Channel 3 Channel 4 Channel 4 Channel 5 Channel 5 Channel 6 Channel 6 Channel 7 Channel 7 Channel 8 Low Alarm High Alarm Low Alar
44. ollers 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 Note Programmable controllers that use process configuration and operation software cat no 6190 PCO can take advantage of those development and runtime tools used for the application of programmable controllers in process control The PCO worksheets and the menu driven configuration screens and faceplates let you configure test debug and operate the I O module Refer to your 6190 PCO software literature for details 4 1 Chapter 4 Module Configuration During normal operation the processor transfers from 1 to 37 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 for each channel When a block transfer write length of 0 is programmed the 1771 IL series B will respond with the Series A default length of 19 Input Range Selection Individual inputs are configurable to operate with any one of five voltage or three current ranges You can select individual channel ranges using the designated words of the write block transfer instruction Table 4 A Two bits are allocated for each channel For example for channel 1 set bits 00
45. pectively Each bit 00 07 represents an alarm indicator for that channel When the bit is set the Word 14 value of that channel is above the high alarm value Bits 08 15 10 17 Not used Bit 00 Offset Calibration Complete O When this bit is set the offset calibration request was successfully completed Gain Calibration Complete G When this bit is set the gain calibration request was successfully completed Bit 02 Save Complete S When this bit is set the save calibration values to EEPROM was successfully completed Bits 03 05 Not used Word 15 Bit 06 EEPROM Fault EF When this bit is set the calibration values could not be saved to EEPROM Calibration Fault CF When this bitis set the module could not Bit 07 perform offset or gain calibration This bit is set when a save is requested Bits 08 15 Calibration Inhibited Each bit represents a channel that was not calibrated either due to an error or a user request If the channel was requested not to be calibrated these bits confirm that request 10 17 Chapter Summary In this chapter you learned the meaning of the status information that the input module sends to the processor 5 3 Module Calibration Chapter Objective In this chapter we tell you how to calibrate your module Tools and Equipment To calibrate your input module you will need the following tools and equipment Tool or Equipment Description Model Type Available from Prec
46. propriate 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 Chapter 7 Troubleshooting Table 7 B Status Reported in Word 1 Decimal Bit dx orc Octal Bit Description Power up bit PU is set after initial power up It will not reset until the Bit 00 module receives a valid write block transfer Note Input data is set to zero until the first BTW is received Bit 01 Out of range bit OR is set if one or more channels are either over or under range Invalid scaling bit IS is set if the firmware cannot use the scaling data in the BTW Acceptable values are between 9999 and 9999 in BCD and 32767 to 32767 in binary Real time sample RTS time out bit is set if the module is using RTS and a block transfer read has not occurred within the programmed more RTS period Invalid Filter bit IF is set if the filter parameters are not correct The value must be between 00 and 99 0 00 and 0 99 seconds in BCD or 0 and 255 0 to 2 55 in binary Invalid Alarm bit IA is set if any alarm value is unusable such as expecting BCD and value is in 2 5 complement binary Hardware Failure bit HF is set if the analog module has an internal hardware failure such as blown fuse etc Alarm bit A is set if there is an alarm i
47. ram 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 alarm values to the module via 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 2 CR 209 mm 0 Chassis Backplane Q O O O O O O40 IO is n gt rl C a Input Module Programmable Controller Cat No 1771 IL B 118454 Accuracy Chapter Summary Chapter 1 Overview of the Input Module 3 The module converts analog signals into binary or BCD format and stores these 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 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 operator inter
48. red 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 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 Output Image Table Control Figure D 1 Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors Only 010 012 017 027 030 060 065 110 112 117 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 F ile Address in BCD R Read 07 Bit 113 030 130 012 png T fo 4 02 120 060 07 Rung 2 Rung 3 012 j 01 012 02 12172 Appendix D Block Transfer Mini P LC 2 and PLC 2 20 Processors Setting the Block Length The input module transfers a specific number of words in one block length The Multiple GET Instructions number of words transferred is determined by the block length entered in the only output image table control byte corresponding to the module s address The bits in the output image table control byte bits 00 05 must be programmed to
49. s a 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 110010 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 C 3 Multiple GET Instructions Mini PLC 2 and PLC 2 20 Processors Appendix Block Transfer Mini PLC 2 and PLC 2 20 Processors Programming multiple GET instructions is similar to block format instructions programmed for other PLC 2 family processors The 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 Figure D 1 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
50. sensors Allen Bradley is a subsidiary of Rockwell International one of the world s leading technology companies A With major offices worldwide pan Algeria e Argentina e Australia e Austria e Bahrain e Belgium e Brazil e Bulgaria e Canada e Chile e China PRC e Colombia e Costa Rica e Croatia e Cyprus e Czech Republic e Denmark e Ecuador e Egypt e EI Salvador e Finland e France e Germany e Greece e Guatemala e Honduras e Hong Kong s Hungary e Iceland e India e Indonesia e Israel e Italy e J amaica eJ apan e J ordan e Korea e Kuwait e Lebanon e Malaysia e Mexico e New Zealand e Norway e Oman 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 Switzerland e Taiwan e Thailand e The Netherlands e Turkey e United Arab Emirates e United Kingdom e United States e Uruguay e Venezuela e Yugoslavia World Headquarters Allen Bradley 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 1771 6 5 91 J une 1994 PN 955115 76 Supersedes publications 1771 6 5 91 November 1991 and 1771 6 5 91 RN1 J anuary 1993 Copyright 1994 Allen Bradley Company Inc Printed in USA
51. sfer data from the input module to the processor Figure 5 1 Word Assignments for the Isolated Analog Input Module 1771 IL series B Block Transfer Read Status word Not used Underrange bits Channels 1 8 5 4 3 2 1 REN PEE a S phe Not used Low Alarm Bits Not used efs High Alarm Bi Calibration Status Bits 5 1 Chapter 5 Module Status and Input Data 5 2 Word 5 thru 12 The Isolated Analog Input Module 1771 IL series B reports the status of all eight channels to the processor as outlined below Table 5 A Bit Word Descriptions for the Isolated Analog Input Modules 1771 IL Read Block Transfer Data Decimal Bit oue Octal Bit Bit 00 Bit 01 Bit 02 Bit 03 Word 1 Bit 04 Bit 05 Bit 06 Bit 07 Bits 08 15 10 17 Bits 00 07 Word 2 Bits 08 15 10 17 Word 3 Bits 08 15 10 17 Bits 00 07 Word 4 Bits 08 15 10 17 Description Power up bit PU is set after initial power up It will not reset until the module receives a valid write block transfer Note Input data is set to zero until the first BTW is received Out of range bit OR is set if one or more channels are either over or under range Invalid scaling bit IS is set if the firmware cannot use the scaling data in the BTW Acceptable values are between 9999 and 9999 in BCD and 32767 to 32767 in binary Real time sample RTS time out bit is set if the
52. structions Figure 3 3 PLC 5 Family Sample Program Structure BTR Enable BTR Bit BLOCK TRANSFER READ RACK GROUP MODULE vod LD CONTROL DATA FILE XXX XX ER LENGTH 00 CONTINUOUS N Pushbutton BTW Enable Bit BTW 2 BLOCK TRANSFER WRITE EN RACK GROUP MODULE UN Power up Bit CONTROL ER DATA FILE LENGTH CONTINUOUS Chapter 2 Communicating With Your Module Module Scan Time 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 Appendix A Figure 3 4 Block Transfer Time End of Block Module available Transfer Write to perform block transfer Block o Transfer Write Configure Ist Scan 2nd Scan 3rd Scan i Time Time 1 2 3 4 5 6 10529 1 Internal Scan time 50ms T 100ms 200ms 300ms 3 1s The following description references the sequence numbers in Figure 3 4 Following a block transfer write 1 the module inhibits communication until after it has loaded the new configuration data 2 scanned the inputs and or outputs 3 and filled the data buffer 4 Configuration block transfers therefore should only be performed when the module is being configured or calibrated Any time after the buffer is filled 4 a block transfer read BTR request can be acknowledged When operated in the default mode new data will be available for a BTR
53. t modules in the same module group You can put an 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 using 1 or 2 slot addressing Avoid placing output modules 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 P 3 Table of Contents Overview of the Input Chapter 1 Module Chapter ObJeCtVes iue deret b abdo d e od ed e Module Descriptions lt e ea 6 cineres rdre RR ERN Crea e STT How Analog Modules Communicate with Programmable Controllers PACCUTACY iu POR aod doe RO ro ad wana Roe nd t po a Chapter Summary ssleeeeeeeee eh Installing the Input Module Chapter 2 Chapter Objectives oisi we re Re pL px PE EE Before You Install Your Input Module lesse Electrostatic Damage esanei ne aaaea eee Power Requirements lssseeeeeeee e Module Location in the I O Chassis 0 0 00 0 cee eee Module Keying i Rx RE tho eee age thee ede eas Wiring Your Input Module sss ssa rs ar er n RR RR cee eee Grounding iim Tan A E ETT R Ta aE SR TRR Setting the Voltage Current Selection Jumpers Module Installation 0 0 cc I Indicator Lights six dice see s rnm hereto Sect syed ome sys Chapter Summary 2 262hio9z epe iaa eL gU Ra eUR e eS Pd ae ESTE Com
54. te maximum scaling values that are 10 17 negative in BCD Default lt 0 positive Bits 00 15 Minimum scaling values for channel 1 Enter in format selected in word 2 Word 4 00 17 bit 08 10 Valid entries are between 49999 and 9999 in BCD 32767 and 432161 in binary Default 2 0 no scaling Bits 00 15 Maximum scaling values for channel 1 Enter in format selected in word 2 Word 5 00 17 bit 08 10 Valid entries are between 49999 and 9999 32767 and 432767 in binary Default 0 no scaling Bits 00 15 Minimum and maximum scaling values for channels 2 through 8 Enter in Words 6 19 00 17 format selected in word 2 bit 08 10 Valid entries are between 9999 and 9999 32767 and 432767 in binary Default 0 no scaling Low alarm sign bits These bits are only used when BCD format is Bits 00 07 chosen in word 2 bit 08 10 When a bit is set 1 the low alarm value for that channel is negative Default is bit reset 0 positive Word 20 Bits 08 15 High alarm sign bits These bits are only used when BCD format is 10 17 chosen in word 2 bit 08 10 When a bit is set 1 the high alarm value for that channel is negative Default is bit reset 0 positive Word 21 Bits 00 15 Low alarm value for channel 1 This represents the value at which the low 00 17 alarm bit for channel 1 word 13 ofthe BTR will be set Word 22 Bits 00 15 High alarm value for channel 1 This represents the value at which the high 00 17 alarm bit for
55. ug O l E wire Belden 8761 Cable o Insulated wires 20104 shield Chassis Ground Single point Grounding When you connect grounding conductors to the 1 0 chassis grounding stud place a star washer under the first lug then place a nut with captive lock washer on top of each ground lug i E Ground Lug E A ee amp p cd 7 B Nut 7 Nut and Captive s Grounding Stud 6 Washer Q ae A Star Washer 1 O Chassis Side Plate Braun Rug 19480 19923 lUse the cup washer if crimp on lugs are not used 10 Thread forming SEIEN External tooth Washers Refer to Wiring and Grounding Guidelines publication 1770 4 1 for additional information 2 7 Chapter 2 Installing the Input Module Indicator Lig hts The front panel of the input module contains a green RUN and a red FLT fault indicator Figure 2 5 At powerup 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 Upon completion of a block transfer write BTW the green RUN indicator will be on and the red FLT indicator will be off If a fault is found initially or occurs later the red FLT indicator lights Possible module fault causes and corrective actions are discussed in Chapter 7 Troubleshooting Figure 2 5 Diagnostic Indicators ISOLATED ANALOG INPUT RUN FLT 105281 Chapter Summary In this chapter you learned how
56. ut proceed as follows NOTE Normally all channels are calibrated simultaneously decimal bits 08015 octal bits 10 17 of word 37 are 0 To disable calibration on any channel set 1 the corresponding bit 08 15 decimal 10 17 octal of word 37 1 Apply 10 00000V across each input channel as shown in Figure 6 2 Figure 6 2 Applying 10 00000V for Gain Calibration Terminal Identification 18 7 Channel 1 16 15 Channel 2 14 Channel 3 13 12 11 Channel 4 10 9 Not used 8 7 Channel 5 6 Channel 6 5 4 Channel 7 3 2 Channel 8 1 Apply 10 00000V Wiring Arm Cat No 1771 WF 105314 2 After the connections stabilize request the gain calibration by setting bit 01 in BTW word 37 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 10 00000V 3 Queue BTRs to monitor for gain calibration complete and any channels which may not have calibrated successfully 6 4 Chapter 6 Module Calibration Save Calibration Values If any uncalibrated channel bits 08 15 10 17 octal of word 15 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 To sa
57. values is 9999 BCD or 32767 binary These values must be entered in the format selected in word 2 bit 08 10 If invalid values are entered into the scaling words the corresponding input in the BTR data will be zero and the invalid scaling bit will be set Table 4 F Default Scaling Values Input Range Default Scaling Value 10 to 10V 4095 to 4095 5 to 5V 0 to 5V to 4 SV 0 to 4095 If scaling and alarms are not selected the module still requires specific BTR and BTW file lengths for the number of channels used Table 4 G shows the required BTR and BTW file lengths Table 4 G Block Transfer Read and Write File Lengths with no scaling or alarms Channels Used BTR File Length BTW File Length Important Use decimally addressed bit locations for PLC 5 processors Chapter 4 Module Configuration Alarms Each input channel has alarm functions that provide status indication through associated status bits in the block transfer read data returned by the module Underrange alarm This bit is set if the input falls below the minimum range for that specific input type This alarm is predefined and cannot be changed by the user In current loop inputs this bit also indicates an open loop Overrange alarm This bit is set if the input rises above the maximum range for that specific input type This alarm is predefined and cannot be changed by the user For all voltage inputs this bit indicates an ope
58. ve these values proceed as follows 1 Request a save to EEPROM by setting bit 02 in BTW word 37 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 Chapter Summary In this chapter you learned how to calibrate your input module 6 5 Chapter Objective Diagnostics Reported by the Module Chapter Troubleshooting We describe how to troubleshoot your module by observing indicators and by monitoring status bits reported to the processor At powerup the module momentarily turns on both indicators as a lamp test then checks for a correct RAM operation a EPROM operation a 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 1f they occur in every transfer of data to the programmable controller processor Monitor the green and red indicators and status bits in word 1 of the BTR file when troubleshooting your module Figure 7 1 Module Indicators ISOLATED A
59. vention or at power up The accuracy of your input module is described in Appendix A In this chapter you read about the functional aspects of the input module and how the module communicates with the programmable controller Installing the Input Module Chapter Objectives This chapter gives you information on calculating the chassis power requirement a choosing the module s location in the I O chassis a configuring your module voltage current selection jumpers a keying a chassis slot for your module a wiring the input module s field wiring arm installing the input module Before You Install Your In put Before installing your input module in the I O chassis you should Module You need to As described under Calculate the power requirements of all modules ii eaccchaeele Power Requirements page 2 2 Determine where to place the module in the 1 0 chassis Module Location in the I O Chassis page 2 2 Setting the Voltage Current Selection J umpers page 2 2 Module Keying page 2 4 Select the input for each channel Key the backplane connector in the I O chassis Wiring Your Input Module page 2 5 and Make connections to the wiring arm Grounding pade 27 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 precautions performance or cause permanent

1771-6.5.91, Isolated Analog Input Module, User Manual

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