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AB Quality Allen-Bradley 1771-DE User Manual

Absolute encoder module
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Allen Bradley
Absolute Encoder
Module
(Cat. No. 1771-DE)
User
Manual

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Summary of Contents for AB Quality Allen-Bradley 1771-DE

  • Page 1 Allen Bradley User Absolute Encoder Module Manual (Cat. No. 1771-DE)

  • Page 2: Table Of Contents

    Table of Contents Using This Manual ....... Chapter Objectives ........What This Manual Contains .
  • Page 3 Table of Contents Offset Feature ........Offset Feature .

  • Page 4: Using This Manual

    Chapter Using This Manual Chapter Objectives Read this chapter to familiarize yourself with this manual. It tells you how to use the manual properly and efficiently. What This Manual Contains This manual contains 5 chapters and 6 appendices: Chapter/ Title What's Covered Appendix Using This Manual...

  • Page 5: Warnings And Cautions

    Chapter 1 Using This Manual If you do not know how to do either of these, read the user’s manual of your processor. Refer to our Publications Index (publication SD499) for a complete list of publications. Warnings and Cautions Throughout this manual we include special notes to alert you to possible injury to personnel or damage to equipment under specific circumstances.

  • Page 6: Introducing The Absolute Encoder Module

    Chapter Introducing the Absolute Encoder Module Chapter Objectives This chapter describes: example applications of the absolute encoder module functions of the module Allen-Bradley processors compatible with the absolute encoder module encoders you can use with the module module specifications Example Applications The absolute encoder module is usually used for: absolute-position feedback high-speed response to position based on encoder values...

  • Page 7: Compatible Processors

    Chapter 2 Introducing the Absolute Encoder Module Compatible Processors You can use the absolute encoder module with any Allen-Bradley programmable controller that uses block-transfer programming in both local and remote 1771 I/O systems. Processors that are compatible with the module include: Mini PLC-2 (cat.

  • Page 8: Module Description

    Chapter 2 Introducing the Absolute Encoder Module Module Description The next four sections give a description and specifications of the absolute encoder module. Status Indicators The module has 10 LED status indicators (Figure 2.1): Eight output status indicators (one for each output) light when the corresponding output circuitry is energized.
  • Page 9 Chapter 2 Introducing the Absolute Encoder Module Figure 2.2 Fuse Locations Right Board 13303 Terminal Identification Figure 2.3 identifies each terminal of the absolute encoder module. The bit x/common terminals refer to: not bit x terminals (uses with differential output encoders) common terminals (used with single-ended output encoders)

  • Page 10: Electrostatic Discharge

    Chapter 2 Introducing the Absolute Encoder Module Figure 2.3 Terminal Identification Left Right Wiring Wiring Bit 0 Output Supply (+5 to 24V dc) Bit 0 / Common Output 0 Bit 1 Output 1 Bit 1 / Common Output 2 Bit 2 Output 3 Bit 2 / Common Output Common (+5 to 24V dc)

  • Page 11: Specifications

    Chapter 2 Introducing the Absolute Encoder Module CAUTION: Electrostatic discharge can degrade performance or damage the module. Handle as stated above. Specifications Module Location Input Power Supply Any 1771 I/O chassis; any 2 slot I.O +5V DC +0.25V (total output group voltage tolerance includes line regulation, load regulation, drift,...

  • Page 12: Summary

    Chapter 2 Introducing the Absolute Encoder Module New Position Throughput Time Environmental Conditions 200 us Operating Temperature 0 to 60 C (32 to 140 Storage Temperature 40 to 85 C ( 40 to 185 Relative Humidity 5 to 95% (without condensation) New Write data Throughput Time Keying (for slot 0 only)

  • Page 13: Configuring And Installing Your Module

    Chapter Configuring and Installing Your Module Chapter Objectives This chapter tells you how to: select module features by setting configuration plugs power module input circuitry and output devices key the module make wiring arm connections install the module Electrostatic Discharge Electrostatic discharge can damage integrated dircuits or semiconductors in this module if you touch backplane connector pins.
  • Page 14 Chapter 3 Configuring and Installing Your Module Figure 3.1 Configuration Plug Locations and Settings (Left Board) Left Board Right 13304 Config Configuration Plug Settings uration Encoder Signal Gray Encoder Plug Mode Encoder Format Rotational Direction Single Differ Natural Standard Increasing Decreasing ended ential...
  • Page 15 Chapter 3 Configuring and Installing Your Module Figure 3.2 Configuration Plug Location and Settings (Right Board) Down Right Board 13305 Configuration Configuration Plug Settings Plug State of Outputs After Loss of Input Power Supply Turn Last State Down Selecting Encoder Format and Input Signal Mode Set configuration plugs E1 through E12 (on the left board) to match the signal mode of each encoder input channel to the encoder.

  • Page 16: Response To External Fault

    Chapter 3 Configuring and Installing Your Module encoders. This is the same as selecting “high true” or “low true” inputs from the Gray encoder. Configuration plug E15 is factory-set in the right position. It gives an increased count when the encoder rotates clockwise when looking at the shaft.

  • Page 17: Power Requirements

    Chapter 3 Configuring and Installing Your Module I/O chassis module slot. They also help to align the module with the backplane connector. Each module is slotted at its rear edge. The position of the keying bands must correspond to these slots to allow insertion of the module. Position the keying bands on the upper backplane connector between the numbers at the right of the connectors.
  • Page 18 Chapter 3 Configuring and Installing Your Module maximum of 300mA. For the best system noise immunity, we recommend use of a separate, linear regulated power supply for powering the input circuitry and the encoder. You can use this supply for more than one absolute encoder module or encoder, but do not use it for otehr 5V loads such as relays.
  • Page 19 Chapter 3 Configuring and Installing Your Module Output Power Supply To power the eight outputs (Figure 3.5), connect at least one +5 to +24V DC supply to terminal 1 and terminal 6 (or 7) of the right wiring arm. You can connect another +5 to +24V DC power supply between terminals 9 and 14 (or 15) of the right wiring arm if, for example, you need two different load supply voltages.

  • Page 20: Wiring Arm Connections

    Chapter 3 Configuring and Installing Your Module Wiring Arm Connections We recommend the following Belden cable or its equivalent to connect the encoder to the module (maximum 50 feet). Use extra twisted pairs to connect power to the encoder. No. of No.
  • Page 21 Chapter 3 Configuring and Installing Your Module Figure 3.6 Single ended Output Encoder Connection Diagram Left Right Single-ended Wiring Wiring Ouput Encoder Bit 0 Common Bit 1 Common Bit 2 Common Output Power Supply Circuitry Common Other bit connections not shown. Continue in this manner until you make all bit connections.
  • Page 22 Chapter 3 Configuring and Installing Your Module Figure 3.7 Differential Output Encoder Connection Diagram Left Right Differential Wiring Wiring Ouput Encoder Bit 0 Bit 0 Bit 1 Bit 1 Bit 2 Bit 2 Output Circuitry Other bit connections not shown. Continue in this manner until you make all bit connections.

  • Page 23: Installing The Module

    Chapter 3 Configuring and Installing Your Module Installing the Module Now that you’ve determined the power requirements, keying, and wiring for your module, you can use the following procedure to install it. Refer to the Programmable Controller Grounding and Wiring Guidelines (pub.
  • Page 24 Chapter 3 Configuring and Installing Your Module Summary This chapter told you how to select features and set configuration plugs on the absolute encoder module, and described the power requirements, keying, wiring, and installation of the module. In the next chapter you will read about block-transfer file parameters.

  • Page 25: Module/Processor Communication

    Chapter Module/Processor Communication Chapter Objectives This chapter describes file parameters for the block-transfer data files you use to write data to and read data from the absolute encoder module. Block Transfer The absolute encoder module and the processor communicate through block-transfer programming.
  • Page 26 Chapter 4 Module/Processor Communication outputs 4 and 5 (and the module is controlling all eight outputs), you must send 20 words to the module; you cannot send only the words associated with outputs 4 and 5. Figure 4.1 Format of Block transfer write Data 15 14 05 04 Control word...
  • Page 27 Chapter 4 Module/Processor Communication Control Words Each control word is associated with two outputs. The lower byte of control word 1 is associated with output 0. Its format is as follows: Bits 0 through 2 are the comparison bits for output 0, preset A (greater than, less than, equal to, greater than or equal to, less than or equal to).

  • Page 28: Write Data Throughput Time

    Chapter 4 Module/Processor Communication Write Data Throughput Time Thewrite-data throughput time is the time between the end of a block-transfer-write operation and the module update of its outputs. The module’s response time can vary, depending on the number of outputs it controls, the type of absolute encoder you use, and if you have an offset value.

  • Page 29: Programming Example

    Chapter 4 Module/Processor Communication Bit 7 is the loss-of-input-power bit. It is set when input power is lost; it is reset when power is restored and bit 6 is reset. Bit 6 is the write-data-valid bit. It is set at power-up and when the processor changes from the program mode to the run mode;...
  • Page 30 Chapter 4 Module/Processor Communication the OE bit Output 0 is turned on when the shaft position is greater than or equal to 330 or when the shaft position is less than or equal to 005. If you don’t set the ZT bit in the above control word, when the encoder shaft position is 002, for example, comparison B is true, comparison A is not true, and the output is turned off.

  • Page 31: Programming Considerations

    Chapter 4 Module/Processor Communication Programming Considerations When you specify the default block length (00), the following considerations apply for PLC-2 family processors: You can and should enable the read and write instructions in the same scan (separate but equal input conditions). The module decides which operation is performed first when both instructions are enabled in the same scan.

  • Page 32: Offset Feature

    Chapter Offset Feature Offset Feature Offset is a new feature of the Absolute Encoder Module (cat. no. 1771-DE, revision B). Revision A modules do not have this feature. Offset is the difference between the 0 position of the absolute encoder and the 0 position of the machine shaft to which the encoder is connected.

  • Page 33: Offset Words

    Chapter 5 Offset Programming In this example, the 0 machine position is “ahead” of the 0 encoder position. Depending on which equation you use (your reference point), the offset value is either positive or negative. Offset Value From 0 Encoder Position and From 0 Machine Position 3584 Encoder Machine shaft...
  • Page 34 Chapter 5 Offset Programming Format of Offset Words 17 16 15 14 13 12 11 10 7 Bit # OFFSET VALUE NO. OF ENCODER POSITIONS The offset words are the last two words of the write-data block that you send to the absolute encoder module.
  • Page 35 Chapter 5 Offset Programming Figure 5.1 Format of Block transfer write Data with Offset 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Control Word for Word #1 > < > < > <...
  • Page 36 Chapter 5 Offset Programming Bit 7 is the loss-of-input-power bit. It is set when input power is lost; it is reset when power is restored and bit 6 is reset. Bit 6 is the write-data-valid bit. It is set at power-up and when the processor changes from program mode to run mode;...
  • Page 37 Chapter 5 Offset Programming Programming Considerations The default block lengths (00) for block-transfer instructions are 20 with Offset block-transfer-write words and two block-transfer-read words. These are the block lengths that transfer to and from the absolute encoder regardless of whether you use the offset feature. When you have an offset value and the module is controlling eight outputs, for example, the number of words you send to the module is 22.
  • Page 38 Chapter 5 Offset Programming LADDER DIAGRAM DUMP START POWER-UP BIT OFF00 WRITE-DATA-VALID BIT PUSHBUTTON TO CHANGE PRESETS OFF00 BLOCK XFER READ DATA ADDR: 0040 MODULE ADDR: READ FILE BLOCK LENGTH: DONE DONE FILE: 0200 - 0201 BUFFER FILE FILE TO FILE MOVE 0044 COUNTER ADDR: 0044...
  • Page 39 Chapter 5 Offset Programming Rung 1 200/06 and 200/04 are returned in the read operation and latch 077/00. When 077/00 is latched, the module toggles between a read operation and a write operation. 121/00 is optional and lets the processor initiate a block transfer write operation.

  • Page 40: Troubleshooting

    Chapter Troubleshooting Chapter Objectives In this chapter you will read how to troubleshoot your absolute encoder module using the ACTIVE (GREEN) and FAULT (red) indicators, block-transfer rungs in your ladder program, and diagnostic bits in word 2 of the read-data file. The following table lists problems indicated by LED changes, possible causes, and recomended actions.
  • Page 41 Chapter 6 Troubleshooting The block lengths of read- and write-block-transfer instructions should be equal (PLC-2 family processors); or if they are different lengths, do not enable the read and write instruction in the same scan. Your conditioning instructions in block-transfer rungs allow the rungs to turn off and on.

  • Page 42: Block Transfer Timing

    Appendix Block transfer Timing Block transfer Timing for PLC 2 The time required for a block-transfer-read or -write operation for PLC-2 Family Processors family processors depends on: the system scan time(s) the number of words to be transferred the I/O configuration the number of enabled block-transfer instructions in the ladder diagram program during any program scan A block-transfer module performs only one block-transfer operation per...
  • Page 43 Appendix A Program Scan (PS) = (5 ms/1K words) x (number of program words) Processor I/O Scan (PIO) = (0.5 ms/rack number) x (declared rack numbers) Remote Distribution I/O Scan (RIO) = (7 ms/chassis) x (number of chassis) Number of Words Transferred (W) = 20 words for one write operation, two words for one read operation Calculate the block-transfer time for a write operation (TW) and for a read operation (TR).
  • Page 44 Appendix A Figure A.1 PLC 2/30 Remote System Example 1772-SD2 PLC-2/30 Rack 1 Rack 2 Rack 4 Rack 3 108121 I We want to find the worst case time between two consecutive block-transfer-read operations from the same module in this system. Solution: Program length = 4K words (K = 1,024) Number of chassis = 4 (1 assigned rack number/chassis)
  • Page 45 Appendix A Number of block-transfer words = 2 words (read) or 20 words (write) Calculate the system values. Processor Scan Time (PS) = (5ms/1K words) x (4K words) = 20ms Processor I/O Scan Time (PIO)=(0.5 ms/rack number) x (4 rack numbers) = 2 ms Remote Distribution I/O Scan Time (RIO) = (7 mx/chassis) x (4 chassis) = 28 ms...
  • Page 46 Appendix A Calculate the system values that are determined by the system configuration. Program Scan (PS) = (5 ms/1K words) x (number of program words) Processor I/O Scan (PIO) = (1 ms/rack number) x (number of declared rack numbers) Number of words transferred (W) = 2 (read) or 20 (write) Calculate the block-transfer time (T) for the read or write operation.
  • Page 47 Appendix A Figure A.2 PLC 2/30 Local System Example PLC–2/30 Rack 1 Rack 3 Rack 2 Rack 4 10813-I Solution: Program length = 4K words Number of chassis = 4 (1 assigned rack number per chassis) Number of block-transfer words, W = 2 (read) or 20 (write) Calculate the system values.
  • Page 48 Appendix A Processor I/O Scan Time (PIO) = (0.5 ms/rack number) x (4 rack numbers) = 2 ms Number of Words Transferred (W) = 2 (read) or 20 (write) Calculate the block-transfer times (T) for the read and write operation. =0.08 ms/word x 2 words = .16 ms (read) =0.08 ms/word x 20 words...
  • Page 49 Appendix A The same equation is used for read and write transfer times. Calculate the worst case system time (ST) between two block-transfer-read operations. =PS + PIO + T(read) + PS + PIO = T(write) Example 3 A Mini-PLC-2/15 programmable controller is communicating with one encoder module in its I/O chassis.
  • Page 50 Appendix A I/O chassis entries in the rack list for the channel I/O channels on the scanner that contain bloc-transfer modules block-transfer modules on the channel (if the I/O chassis containing a block-transfer module appears more than once in the I/O chassis rack list, count the module once each time the chassis appears in the rack list).) The typical time required for the encoder module to complete a...
  • Page 51 Appendix A Determine the nominal block-transfer time. Compute the approximate scanner time for each block-transfer channel. Compute the encoder re-/write-block-transfer time. Example Computation An example computation to determine the block-transfer timing with a PLC-3 family processor follows. The example is based on these facts: user program contains 20K words channel 1 contains five I/O chassis with a total of seven block-transfer modules including one encoder module...
  • Page 52 Appendix A Description Number Active I/O channels Block transfer I/O channels Block transfer modules on each I/O block transfer channel I/O chassis on each block transfer I/O channel (I/O chassis in rack list) Determine a time from the table. Example values have been added. Active I/O channels containing one or more block transfer modules...
  • Page 53 Appendix A = 476 + 36 = 512 ms CT2 = Not a block-transfer channel CT3 = [68] x [1] + 1 x 9 = 68 + 9 = 77 ms CT4 = Not an active channel Compute the encoder read-/write-block-transfer time. Example values have been added.

  • Page 54: Application Considerations

    Appendix Application Considerations Application Considerations The absolute encoder module can control outputs within a one-count resolution (turn an output on at position 065 and off at position 066) if shaft speed does not exceed a certain limit. This speed limit depends on the number of outputs and the number of counts on the encoder.
  • Page 55 Appendix B In the first sample (Figure B.1), we assume that the encoder shaft is turning close to the maximum allowable shaft sped according to the above equation. The shaft is in each discrete position for only 220 us, giving 360 increments (or one revolution) every 79 ms.
  • Page 56 Appendix B Figure B.2 Encoder Operating at Typical Speed (60 RPM) μ (Shaft Position) (000) (001) (002) Encoder LSB (Bit 0) 2.8 ms Position Throughput Time Output Bit 13307 The first waveform of Figure B.1 and Figure B.2 represents the least significant bit (LSB), or bit 0, of a BCD or binary encoder.
  • Page 57 Appendix B The second waveform represents the new position throughput time of the module. The third waveform represents an output programmed to turn on an actuator device (waveform high) when the encoder position is 000 and to turn it off (waveform low) when the encoder position is 001. The new position throughput time of the module is based on the following sequence of events: The encoder shaft increases one position.
  • Page 58 Appendix B When New Position Controlling: Throughput Time is: 8 outputs 200 us 6 outputs 154 us 4 outputs 111 us 2 outputs 71 us You must take into account the fixed throughput time, the number of outputs per module, and the number of increments between the preset values when determining the appropriate machine preset values for a design shaft speed.
  • Page 59 Appendix B During the next scan the module reads position 032 and turns the output In this case you could program presets of 030 and 045 with the understanding that the change of output could occur a few increments after those positions. Hardware RC filtering in the module input circuitry is designed to attenuate high frequency noise spikes that may pass through the opto- isolators.

  • Page 60: Block Transfer Ladder Diagram Examples

    Appendix Block transfer Ladder Diagram Examples Bidirectional Block transfer for Figure C.1 illustrates the rungs you need to initiate a bidirectional PLC 2 Family Processors block-transfer operation using a PLC-2 family processor. Figure C.1 Example Block transfer Rungs for PLC 2 Family Processors BLOCK XFER READ DATA ADDR: 0050...
  • Page 61 Appendix C Data Address: 0050/051 This is the first possible address in the timer/counter area of the data table. Use the first available timer/counter address for your first block-transfer module data address. Module Address: 470 The module is located in rack 4, I/O group 7, slot 0. (Two-slot modules are addressed as being in slot 0.) Block Length: 00 Use the default value for the maximum number of words to read (two)
  • Page 62 Appendix C Figure C.2 Example Read and Write data File (PLC 2 Family Processors) HEXADECIMAL DATA MONITOR FILE TO FILE MOVE POSITION: 001 COUNTER ADDR: FILE LENGTH: FILE A: 2600 2623 FILE R: 2700 2723 POSITION FILE A DATA FILE R DATA 0200 9E9E 0054...

  • Page 63: Bidirectional Block Transfer For Plc 3 Processors

    Appendix C Thus, the current encoder position is between 045 and 089 (words 4 and 5), which are the presets for output 1. Bidirectional Block transfer for Figure C.3 shows you how to program a bidirectional block-transfer PLC 3 Processors operation using a PLC-3 processor.
  • Page 64 Appendix C Use a file-to-file move to buffer the read data. Use B016:0001 (status) and B016:0002 (position) for all data comparisons. Rack: 002 The module is located in rack 2. Group: 3 The module is located in I/O group 3. Module: 0 = low The module is in the low slot of the I/O group.

  • Page 65: Read Only Block Transfer For Plc 2 Family Processors

    Appendix C Figure C.4 Example Read and Write data Files (PLC 3 Processors) RADIX = %H START = WB015:0000 WORD # 00000 0000 0200 0693 0000 0000 0000 0000 0000 00008 0000 0000 0000 9E9E 0000 0511 0512 1023 00016 9E9E 1024 1535...
  • Page 66 Appendix C Figure C.5 Example Read only Block transfer Program for PLC 2 Family Processors LADDER DIAGRAM DUMP START POWER-UP BIT OFF00 WRITE-DATA-VALID BIT PUSHBUTTON TO CHANGE PRESETS OFF00 BLOCK XFER READ DATA ADDR: 0040 MODULE ADDR: BLOCK LENGTH: FILE: 0200 - 0277 READ FILE...
  • Page 67 Appendix C Rung 1 200/06 and 200/4 are returned in the read operation and latch 077/00. When 077/00 is latched, the module toggles between a read operation and a write operation. 121/00 is optional and lets the processor initiate a block transfer write operation.

  • Page 68: Bit And Word Descriptions Of Block-Transfer Data

    Appendix Bit and Word Descriptions of Block-transfer Data Block-transfer-write Data Control Word for Outputs 0 and 1 Bit No. Title Description Output enable bit - set this bit if you want output 1 turned on when comparisons with presets 1A and 1B are true. Zero transition bit - set this bit when you want output 1 energized during a transition through position 000.

  • Page 69: Block-Transfer-Read Data

    Appendix D Preset Words Word Description Preset value A for output 0 Preset value B for output 0 Preset value A for output 1 Preset value B for output 1 Preset value A for output 2 Preset value B for output 2 Preset value A for output 3 Preset value B for output 3 Preset value A for output 4...
  • Page 70 Appendix D Word No. Bit No. Description Write-data-valid bit - bit is set at power up and when the processor changes from program to run mode; it is reset when the module receives valid write data. Unused Non-BCD preset flag - bit is set when any preset is in non-BCD format.
  • Page 71 Appendix D If non-BCD Then it is And the Hex And the binary digit is in word: preset: error code is: equivalent is: 1110 1111...

  • Page 72: Connection Diagrams For Allen Bradley Encoders

    Appendix Connection Diagrams for Allen Bradley Encoders Connection Diagrams for Figures E.1 through Figure E.3 show you how to connect several Allen Bradley Encoders Allen-Bradley encoders to the absolute encoder module: Figure E.1 shows you how to connect a Bulletin 845A encoder, 0 to 359-count, 10-bit, BCD, single-ended output encoder.
  • Page 73 Appendix E Figure E.1 Connection Diagram for Allen Bradley Encoder, Bulletin 845A (BCD) 1771 DE Left Right Wiring Wiring (Pin R) BRN DECADE 1 - 1 (Pin K) ORN DECADE 1 - 2 (Pin E) YEL DECADE 1 - 4 (Pin A) GRN DECADE 1 - 8 (Pin B) BLU DECADE 2-1 (Pin G) VIO DECADE 2 - 2...
  • Page 74 Appendix E 0 to 255 count, 8 bit, Standard Follow these guidelines: Gray, Single ended Output Set configuration plug E15 on the absolute encoder module to the right position for increasing position. Signal common (pin X) and ground (pin W) are internally connected on the encoder.

  • Page 75: To 359 Count, 10 Bit, Bcd, Single Ended Output, Latching

    Appendix E 0 to 359 count, 10 bit, BCD, Follow these guidelines: Single ended Output, Latching The encoder counts up in a counterclockwise direction if you make pin H an open connection or if you connect it to +5V; if you connect it to ground, the encoder counts up in a clockwise direction.
  • Page 76 Appendix E Figure E.3 Connection Diagram for Allen Bradley Encoder, Bulletin 845C (BCD) 1771 DE Left Right Wiring Wiring Pin S D1 - 1 Pin W D1 - 2 Pin R D1 - 4 Pin K D1 - 8 Pin E D2 - 1 Pin A D2 - 2 Pin F D2 - 4 Pin B D2 - 8...

  • Page 77: Glossary

    Appendix Glossary This glossary defines terms pertaining to Allen–Bradley Absolute Encoder Modules. For abroader glossary of programmable controller words, refer to our Programmable Controller Terms (publication no. PCGI–7.2). ABSOLUTE ENCODER: An encoder with a unique digital output code for each increment of shaft rotation BIDIRECTIONAL BLOCK TRANSFER: The performance of alternating read and write operations between an...
  • Page 78 Appendix F the appropriate response occurring at the output terminals; it depends on the number of outputs the module is controlling NEW WRITE–DATA THROUGHPUT TIME: The time between the end of a block–transfer–write operation and the module update of outputs ONE–COUNT RESOLUTION: The ability of the module to perform within one increment of shaft rotation;...
  • Page 79 Index Symbols **Empty**, Glossary, Application Considerations, Installation, 3 11 Block-tranfer-write Data, Keying, Block-transfer Timing PLC-2/15, PLC-2/30 Local System, PLC-2/30 Remote System, Module Functions, PLC-3, module throughput time, Block-transfer-read Data, Block-transfer-read-Data, one-count resolution, Cabling, Compatible Encoders, Power Requirements Configuration Plugs, Location Input, Setting, Output,...
  • Page 80 Allen Bradley, a Rockwell Automation Business, has been helping its customers improve productivity and quality for more than 90 years. We design, manufacture and support a broad range of automation products worldwide. They include logic processors, power and motion control devices, operator interfaces, sensors and a variety of software. Rockwell is one of the world's leading technology companies.

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