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2–3

Preliminary Adjustments

Publication 1771ĆUM006B-EN-P - June 2002

Figure 2.1

Input Pulses

Time

Encoder

Channel A

Channel B

x1

x2

x4

Up

Pulsed

to

Counter

Encoder

Channel A

Channel B

x1

x2

x4

Down

Pulsed

to

Counter

15945

In the counter mode, the module adds the incoming pulses on
channel A.  The count is incremented on the rising edge of the pulse
(high true).  The direction of the count can be controlled with either
the control word or an external switch wired to channel B.  Channel
B must be left unconnected if the count direction is to be software
controlled.  Typical input device counting might be high speed static
switches and incremental encoders.  Mechanical switches are not
recommended as input counting devices used with the 1771-IJ
because the contact bounces might be counted as pulses.  However,
the 1771-IK can be used with a mechanical switch, provided the
module is configured for mechanical counting (filter has been put in)
and the counting frequency does not exceed 50Hz.  To use the
module in the counter mode, switch 4 must be set to counter (off).

Содержание Allen-Bradley 1771-IJ

Страница 1: ...User Manual Encoder Counter Modules Cat Nos 1771 IJ and 1771 IK Allen Bradley...

Страница 2: ...registered trademarks of Allen Bradley Company Inc Windows is a trademark of Microsoft Microsoft is a registered trademark of Microsoft IBM is a registered trademark of International Business Machines...

Страница 3: ...ntroduction General overview of the modules 2 Preliminary Adjustments Setting the switches and understanding the operation 3 Installation How to install the modules 4 Module Processor Communication Ho...

Страница 4: ...lines for Application Installation and Maintenance of Solid State Control available from your local Rockwell Automation office describes some important differences between solid state equipment and el...

Страница 5: ...Using This Manual P 3 Publication 1771 UM006B EN P June 2002 This preface gave you information on how to use this manual efficiently Summary...

Страница 6: ...Using This Manual P 4 Publication 1771 UM006B EN P June 2002...

Страница 7: ...odule Placement 3 2 Recommended Cable 3 2 Shielded Cable 3 4 Keying 3 5 Specifications 3 5 Chapter 4 General 4 1 Outputs Words 4 2 Input Status Word 4 2 Chapter 5 General 5 1 Output Words Single Trans...

Страница 8: ...rd 6 1 Preset Words 6 4 Example Block Transfer Programs 6 5 PLC 2 Family Processors 6 5 Rung Descriptions 6 6 PLC 3 Family Processors 6 7 PLC 5 Family Processors 6 9 Chapter 7 Extending the Count Beyo...

Страница 9: ...disregard chapter 6 on block transfer Block transfer programming Use block transfer any time If using block transfer disregard chapter 5 on single transfer The encoder counter module maintains a coun...

Страница 10: ...tionally the module can improve the accuracy of certain quadrature type of encoders by adding the count at both channel A and channel B times 2 mode or by counting the rising and falling of both chann...

Страница 11: ...s when the module detects a fault Figure 1 2 Red LED Status Indicators Channel A Channel B Marker Limit Output 1 Output 2 Fault 15943 When system power is turned on the module runs a self test During...

Страница 12: ...drive output devices from a separate load supply using the output on the module only as a switch When the output is on and conducting a maximum of 0 5V dc is dropped across it The load supply voltage...

Страница 13: ...chassis This type of programming shifts a single word of data each program scan from the processor s data table to the module It therefore takes three program scans to send a new control word and the...

Страница 14: ...ons of the status word and the preset values must account for the multipliers The count resolution setting may also be limited by the program scan time if the carry or borrow bits are used to cascade...

Страница 15: ...ord or an external switch wired to channel B Channel B must be left unconnected if the count direction is to be software controlled Typical input device counting might be high speed static switches an...

Страница 16: ...ts a voltage of 2 4V dc or above at either channel as logic 1 or true A voltage below 0 6V dc is considered as logic 0 or false Table 2 C Input Configuration Switch Assembly 1771 IJ SW 2 1 2 3 Marker...

Страница 17: ...f devices that will operate in the 12 to 24V dc range Figure 2 2 Since most high voltage quadrature encoder outputs produce signals through an open collector output the module is configured for a pull...

Страница 18: ...B input and the marker input are for open collector encoder drivers the channel B input has an internal pull up and are not switch selectable The marker input reads a signal as high true The limit swi...

Страница 19: ...channel B input changes state Refer to the connection diagrams Figures 3 1 and 3 2 for interfacing different devices Switch assembly settings these features are selected on two switch assemblies that...

Страница 20: ...f a ball point pen can be used to set the rocker arm of a switch Do not use a pencil because the point can break off and jam the switch 4 Set the three switches of SW 2 Table 2 E according to the inpu...

Страница 21: ...o prevent personal injury resulting from accessibility to live parts The interior of the enclosure must be accessible only by the use of a tool Subsequent sections of this publication may contain addi...

Страница 22: ...group low voltage input modules together within a single I O chassis whenever possible WARNING Remove power from the I O chassis backplane and wiring arm before removing or installing a module Failur...

Страница 23: ...y Not Assigned Input Device Power Limit Switch Output 2 Output Return 15948 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 If multiple power sources are used maintain isolation between supplies...

Страница 24: ...lated Power Supply If necessary If multiple power sources are used maintain isolation between supplies Output 2 Note Use isolated external supplies as shown here or use a single supply as shown on fig...

Страница 25: ...to be keyed Snap the keying bands on the upper backplane connectors between these numbers printed on the backplane Table 3 A Keying is different for the 1771 IJ and the 1771 IK Table 3 A Module Keying...

Страница 26: ...3 6 Installation Publication 1771 UM006B EN P June 2002...

Страница 27: ...gramming techniques are used to coordinate and control this bidirectional data transfer Complete 16 bit words are transferred between the module and the processor The processor sends up to 3 words of...

Страница 28: ...the module differ depending on whether single transfer or block transfer programming is used In addition the bit by bit significance of these words is dependent on the data transfer method used For t...

Страница 29: ...the diagnostic bit is set to 1 if the module has detected a fault in its own operation normally this bit is 0 Bits 15 and 16 are the carry and borrow bits respectively These bits indicate whether the...

Страница 30: ...4 4 Module Processor Communication Publication 1771 UM006B EN P June 2002...

Страница 31: ...methods Section titled Single Transfer Description gives a general description of how single transfer programming works and an example for applications where no preset words are required Section titl...

Страница 32: ...10 11 Function Control see table Bits 00 02 Comparison Parameters for Preset 1 1 True 0 False Bits 03 05 Comparison Parameters for Preset 2 1 True 0 False Counter Mode Only Bit 13 Up Down 1 Count Up 0...

Страница 33: ...enabled or reset by the program The table in Figure 5 1 shows the bit settings for each function Bit 07 is the home latch enable bit The module resets the count to zero only when all three of these c...

Страница 34: ...han one of these bits can be set to 1 for each preset allowing such combinations as less than or equal to greater than or equal to or not equal to Preset Words In single transfer communication the pre...

Страница 35: ...e word output to the module If non BCD digits are entered in a preset value the module sets its default preset value to 000 for the word Single transfer programming uses the I O scan for bidirectional...

Страница 36: ...le Module Position Image Table Word Relationship 1 2 3 4 5 6 7 8 Output Word 016 Input Word 116 Output Word Written to Module 16 bits Input Word Read from Module 16 Bits Encoder Counter Module in I O...

Страница 37: ...ngs No Preset Words Used Figure 5 5 illustrates a typical example in which bidirectional single transfer occurs assuming that no preset words are used This example assumes the module placement shown i...

Страница 38: ...l when one or more preset words are needed Multiplexing requires an orderly sequencing of events in the program The program must coordinate control of the output image table word such Multiplexing req...

Страница 39: ...Family Processors describes a suitable scan counter for these processors With the PLC processor however the I O scan and program scan are asynchronous this means that the scan counter must be programm...

Страница 40: ...itself is always false sets the conditions for the counter as false Because an up counter CTU increments for each false to true transition CTU 030 registers one count each time the program scan occur...

Страница 41: ...unter module is placed in module group 7 and unused input in module group 0 would be appropriate for this purpose Note that the I O rack number is of no consequence in selecting this bit The second co...

Страница 42: ...ut words to the encoder counter module This example uses the type of scan counter recommended for PLC 2 processors However the general format of these rungs would be the same for a PLC processor with...

Страница 43: ...module group 2 Output control word is stored in word 051 Preset words 1 and 2 are stored in words 052 and 053 respectively The scan counter is recycled as shown in rung 6 This allows continuous update...

Страница 44: ...5 14 Single Transfer Programming Publication 1771 UM006B EN P June 2002...

Страница 45: ...techniques can be the easiest to use in any application where only a single output control word must be sent to the module For this reason when not using any of the preset words use single transfer pr...

Страница 46: ...tion Control See Table Bit 03 Up down 1 count up 0 count down Significant in counter mode only Bit 02 Enable outputs 1 Enable 0 Disable Bit 04 Home Latch Enable 1 Enable 0 Disable Bits 05 17 Not used...

Страница 47: ...ements its accumulated count with each pulse received on Channel A 0 The module decrements its accumulated count with each pulse received on channel A Note that if a device is wired to the Channel B i...

Страница 48: ...ether bits 00 13 are of binary or BCD format Note If BCD operation has been selected only BCD digits should be entered in the data table word output to the module If non BCD digits are entered in a pr...

Страница 49: ...the processor s data table with a block transfer read BTR instruction You transfer data to your module from the processor s data table with a block transfer write BTW instruction PLC 2 Family Process...

Страница 50: ...sfer communications fault should occur Figure 6 4 Example Ladder Logic for PLC 2 Block Transfer 010 EN 16 110 DN 16 010 EN 17 110 DN 17 0053 EN 17 0053 DN 15 110 17 1 2 15963 BLOCK XFER WRITE DATAADDR...

Страница 51: ...cution of BTR and BTW instructions The processor checks data validity before accepting read data and sets one enable bit at a time Refer to Figure 6 5 for generalized ladder logic and to Figure 6 6 fo...

Страница 52: ...H FB002 0150 0 FB001 0030 BTR BLOCK XFER READ RACK GROUP MODULE DATA LENGTH CNTL 002 1 1 HIGH FB002 0220 0 FB001 0020 Rung Descriptions Rung 1 Rung one is true only at power up It uses status word 3 b...

Страница 53: ...le Ladder logic alternates the execution of BTR and BTW instructions The processor checks data validity before accepting read data and sets one enable bit at a time Refer to Figure 6 7 for generalized...

Страница 54: ...trol Block 0 0 0 N11 10 DN Data File Length Continuous N11 15 0 N ER File 2 Rung 0 File 2 Rung 1 15965 N10 10 15 N11 10 15 Rung Descriptions Rungs 0 and 1 Rungs 0 and 1 execute BTW and BTR instruction...

Страница 55: ...3 family processors Both programs Figure 7 1 and Figure 7 2 extend the count beyond 999 4095 binary in the same manner Either program compares the new count value with the value in the previous scan o...

Страница 56: ...ZERO THEN INCREMENT THE COUNT THE CONSTANT MUST BE LESS THAN 1 2 THE TOTAL COUNTS OF THE IJ IK HALF OF 999 OR 4095 0076 00 0077 16 Ctu 0052 Pre 999 ZERO NEGATIVE VALUE DIFF DIGITS SIGNIF MOST AFTER PA...

Страница 57: ...RUNG NUMBER RM3 MVM MOVE WITH MASK A WB002 0200 0110000101011100 B WB005 0000 000011111111111111 R WB005 0001 0000000101011100 MOV MOVE FROM A TO R A WB005 0001 0000000101011100 R WN005 0000 348 LES A...

Страница 58: ...he old count value from the new value and stores the difference with its sign A New count value B Old count value R Difference of new count value less old value Rung 2 This rung looks at the sign and...

Страница 59: ...ation 1771 IJ 22 9 BTU hr 1771 IK External Supply Vext 12 24V dc Input circuits require 170mA maximum Output circuits require 1 08A maximum Input Ratings 0 Vin Vext For Vext 12V dc Vih 7 2V dc max Vil...

Страница 60: ...F 40 to 85 C Relative Humidity IEC 60068 2 30 Test Db Unpackaged Nonoperating Damp Heat 5 to 95 noncondensing Shock Operating Nonoperating IEC 60068 2 27 Test Ea Unpackaged Shock 30g 50g Vibration IEC...

Страница 61: ...nt CE2 European Union 89 336 EEC EMC Directive compliant with EN 61000 6 4 Industrial Emissions EN 50082 2 Industrial Immunity EN 61000 6 2 Industrial Immunity EN 61326 Meas Control Lab Industrial Req...

Страница 62: ...Specifications A 4 Publication 1794 UM006B EN P June 2002...

Страница 63: ...5 E encoder counter general description 1 1 encoder counter selection 2 2 example block transfer programs 6 5 single transfer no preset words 5 7 PLC 2 5 12 external power requirements 1 4 I indicator...

Страница 64: ...2002 S scan counter PLC 2 5 9 selection cable 3 2 encoder counter 2 2 setting switches 2 7 single transfer bit description 5 2 output words 5 1 preset words 5 4 status indicators 1 3 switch data form...

Страница 65: ...al accessibility info not in manual text illustration Technical Accuracy Completeness What information is missing Clarity Sequence What is not in the right order What is unclear Other Comments Use bac...

Страница 66: ...CESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS MAIL PERMIT NO 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE TECHNICAL COMMUNICATION 1 ALLEN BRADLEY DR MAYFIELD HEIGH...

Страница 67: ...and 24 hour emergency hotline software and documentation updates technical subscription services Engineering and Field Services application engineering assistance integration and start up assistance...

Страница 68: ...Publication 1771 UM006B EN P June 2002 Supersedes publication 1771 6 5 6 May 1988 and 1771 6 5 6 RN1 November 1995 PN957678 18 Copyright 2002 Rockwell Automation Inc Printed in USA...

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