Rockwell Automation 1769-HSC User Manual

User Manual

Compact High-speed Counter Module

Catalog Number

1769-HSC

Important User Information

Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication your local Rockwell Automation sales office or online at

http://www.rockwellautomation.com/literature/) describes some

important differences between solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid-state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which can lead to personal injury or death, property damage, or economic loss.

SGI-1.1 available from

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence

SHOCK HAZARD: Labels can be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage can be present.

BURN HAZARD: Labels can be on or inside the equipment, for example, a drive or motor, to alert people that surfaces can reach dangerous temperatures.

IMPORTANT

Allen-Bradley, Rockwell Software, Rockwell Automation, RS Logix, R SLogix 5000, RSLogix 500, CompactLogix, Compact I/O, ControlLogix, MicroLogix , and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

Identifies information that is critical for successful application and understanding of the product.

Summary of Changes

This manual contains new and updated information. Changes throughout this revision are marked by change bars, as shown to the right of this paragraph.

New and Updated Information

This table contains the changes made to this revision.

Topic Pages

Changes were made to differentiate between the available high speed counters modules.

31, 32, 37, 40, 66, 70, 72, 73, 74, 76, 80, 81, 84, 85, 86, 88, 89, 95, 96, 97, 98, 100, 101, 105, 107, 121

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 3

Summary of Changes

Notes:

4 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Preface

Module Overview

Module Operation

Packaged Controller Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 1

Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter 2

Counter Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Module Operation Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Number of Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Summary of Available Counter Configurations . . . . . . . . . . . . . . . . . . . . . 18

Input Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Operational Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Direction Inhibit and Direction Invert Output Control Bits . . . . . 21

Pulse/External Direction Mode Selection. . . . . . . . . . . . . . . . . . . . . . . 22

Pulse/Internal Direction Mode Selection . . . . . . . . . . . . . . . . . . . . . . . 23

Up and Down Pulses Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 24

X1 Quadrature Encoder Mode Selection . . . . . . . . . . . . . . . . . . . . . . . 25

X2 Quadrature Encoder Mode Selection . . . . . . . . . . . . . . . . . . . . . . . 26

X4 Quadrature Encoder Mode Selection . . . . . . . . . . . . . . . . . . . . . . . 26

Input Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Counter Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Linear Counter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Ring Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Modifying Count Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Counter Enable/Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Z Input Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Inhibit and Invert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Direct Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Preset/Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Rate/Timer Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Pulse Interval Rate Calculation Method . . . . . . . . . . . . . . . . . . . . . . . . 32

Cyclic Rate Calculation Method (current rate). . . . . . . . . . . . . . . . . . 32

Hysteresis Detection and Configuration. . . . . . . . . . . . . . . . . . . . . . . . 33

Scalar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Rate Valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Rate Method Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 5

Table of Contents

Installation and Wiring

Output Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Masks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Overcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Safe State Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Output Control Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Readback/Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Chapter 3

Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Selecting a Location to Reduce Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Protect the Circuit Board from Contamination . . . . . . . . . . . . . . . . . 48

Power Supply Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

System Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Mount the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Replace the Module within a System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Field Wiring Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Considerations for Reducing Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Remove and Replace the Terminal Block . . . . . . . . . . . . . . . . . . . . . . . 55

Wire the Finger-safe Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Wire the Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Terminal Door Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Terminal Block Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Wire Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Chapter 4

Module Configuration, Output, and Input Data

6 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Configure the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Configuration Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

General Configuration Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Filter Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Program Mode and Program State Run . . . . . . . . . . . . . . . . . . . . . . . . . 76

Output Program Value (Out0ProgramValue through

Out3ProgramValue) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Output Fault Mode and Output Fault State Run . . . . . . . . . . . . . . . . 77

Output Fault Value (Out0FaultValue through Out3FaultValue) . 78

Counter Maximum Count (CtrnMaxCount) . . . . . . . . . . . . . . . . . . . 78

Counter Minimum Count (CtrnMinCount) . . . . . . . . . . . . . . . . . . . 79

Counter Preset (CtrnPreset). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Counter Hysteresis (CtrnHysteresis) . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Counter Scalar (CtrnScalar) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Table of Contents

Cyclic Rate Update Time (CtrnCyclicRateUpdateTime) . . . . . . . . 81

Configuration Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Range High Limit (Range0To11[n].HighLimit) and Range Low

Limit (Range0To11[n].LowLimit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Range Output Control (Range0To11[n].OutputControl). . . . . . . 85

Range Configuration Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Output Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Output on Mask (OutputOnMask.0 through OutputOnMask.15). . 91 Output Off Mask (OutputOffMask.0 through OutputOffMask.15). 91

Range Enable (RangeEn.0 through RangeEn.15) . . . . . . . . . . . . . . . 91

RBF - Reset Blown Fuse (ResetBlownFuse) . . . . . . . . . . . . . . . . . . . . . 92

Control Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Range High Limit or Direct Write Value

(Range12To15[n].HiLimOrDirWr). . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Range Low Limit (Range12To15[n].LowLimit) . . . . . . . . . . . . . . . . 95

Range Output Control (Range12To15[n].OutputControl). . . . . . 96

Range Configuration Flags (12To15) . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Input Array. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Input State (InputStateA0 through InputStateZ1) . . . . . . . . . . . . . 101

Readback (Readback.0 through Readback.15). . . . . . . . . . . . . . . . . . 101

Status Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Range Active (RangeActive.0 through RangeActive.15). . . . . . . . . 103

Current Count (Ctr[n].CurrentCount). . . . . . . . . . . . . . . . . . . . . . . 104

Stored Count (Ctr[n].StoredCount). . . . . . . . . . . . . . . . . . . . . . . . . . 104

Current Rate (Ctr[0].CurrentRate to Ctr[3].CurrentRate) . . . . . 105

Pulse Interval (Ctr[0].PulseInterval and Ctr[1].PulseInterval). . . 105

Status Flags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Diagnostics and Troubleshooting

Chapter 5

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Stand Clear of the Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Program Alteration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Module Operation versus Counter Operation . . . . . . . . . . . . . . . . . . . . . 111

Counter Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Module Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Power-up Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Configuration Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Post Configuration Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Non-critical versus Critical Module Errors . . . . . . . . . . . . . . . . . . . . . . . . 113

Non-critical Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Critical Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 7

Table of Contents

Specifications

Program a 1769-HSC Module, CompactLogix Controller, and 845F Incremental Encoder with RSLogix 5000 Software

Module Error Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Module Error Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Extended Error Information Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Appendix A

Throughput and Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Rate Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Temperature Derating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Appendix B

System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

845F Encoder Wiring to the 1769-HSC Module. . . . . . . . . . . . . . . . . . . 132

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Add a 1769-HSC Module to a CompactLogix System . . . . . . . . . . . . . . 133

Configure the 1769-HSC Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Monitor the Current Count and Verify Output Operation . . . . . . . . . 140

Program a 1769-HSC Module, MicroLogix 1500 Controller, and 845F Incremental Encoder with RSLogix 500 Software

Programming Quick Reference

History of Changes

Glossary

Index

Appendix C

System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

845F Encoder Wiring to the 1769-HSC Module. . . . . . . . . . . . . . . . . . . 142

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Add a 1769-HSC Module to a MicroLogix 1500 System. . . . . . . . . . . . 143

Configure Your 1769-HSC Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Monitor the Current Count and Verify Output Operation . . . . . . . . . 148

Appendix D

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Appendix E

1769-UM006C-EN-P, November 2010 . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

8 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Preface

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Compact I/O and/or MicroLogix 1500 or CompactLogix controllers.

Packaged Controller Functionality

Additional Resources

Both the 1769-L24ER-QBFC1B and 1769-L27ERM-QBFC1B packaged controllers provide the same high-speed counter (HSC) functionality as the 1769-HSC except for the input frequency.

While many features of the 1769-HSC module are available with the embedded high-speed counters, some of the features of the 1769-HSC module are not available with the embedded high-speed counters of the CompactLogix packaged controllers. Features not available on the embedded high-speed counters include rate/timer functions and limited output range control (4 ranges instead of the 16 available with the 1769-HSC module). Specific differences between the 1769-HSC module and the packaged controller functionality are noted throughout this manual.

The CompactLogix Packaged Controllers Quick Start and User Manual, publication

IASIMP-QS010, provides wiring diagrams, configuration

procedures, and tag descriptions for the embedded high-speed counters.

These documents contain additional information concerning related products from Rockwell Automation.

Resource Description

CompactLogix System User Manual, publication 1769-UM007

Compact I/O 1769-ADN DeviceNet Adapter User Manual, publication 1769-UM001

Compact I/O Selection Guide, publication

CompactLogix Packaged Controllers Quick Start and User Manual, publication

MicroLogix 1500 Programmable Controllers User Manual, publication

MicroLogix Programmable Controllers Family Selection Guide, publication 1761-SG001

Industrial Automation Wiring and Grounding Guidelines, publication

Product Certifications website,

IASIMP-QS010

1764-UM001

1770-4.1

http://www.ab.com Provides declarations of conformity,

1769-SG002 Describes the 1769 Compact I/O modules.

Describes how to install, use, and program your CompactLogix controller.

Describes how to install, and use the 1769-ADN DeviceNet adapter.

Provides a quick start and information on how to install, use, and program your CompactLogix packaged controller.

Describes how to install, use, and program your MicroLogix 1500 controller.

Provides an overview of the MicroLogix 1500 system.

Provides general guidelines for installing a Rockwell Automation industrial system.

certificates, and other certification details.

You can view or download publications at

http://www.rockwellautomation.com/ literature/. To order paper copies of technical documentation, contact your local

Allen-Bradley distributor or Rockwell Automation sales representative.

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 9

Preface

Notes:

10 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Chapter 1

Module Overview

The 1769-HSC module is an intelligent counter module with its own microprocessor and I/O that is capable of reacting to high-speed input signals. The module can interface with up to two channels of quadrature or four channels of pulse/count inputs. The signals received at the inputs are filtered, decoded, and counted. They are also processed to generate rate and time-between-pulses (pulse interval) data. Count and rate values can then be used to activate outputs based on user-defined ranges.

IMPORTANT

For the 1769-L23E-QBFC1B and 1769-L23-QBFC1B packaged controllers HSC functionality, there is no processing to generate rate or timebetween-pulses data. Only count data is used to activate outputs based on ranges.

The module counts pulses at up to 1 MHz (250 kHz for the packaged controllers) from devices such as proximity switches, pulse generators, turbine flowmeters, and quadrature encoders. The module has four on-board, high-speed switching outputs. These outputs can be under user program or direct module control, based on the count value or frequency.

The 1769-HSC module is compatible with MicroLogix 1500 packaged controllers (1764-LSP/C and 1764-LRP/C modules, firmware revision 6.0 and later), CompactLogix controllers (generic profiles required for firmware revisions prior to 11.0), and the 1769-ADN/B DeviceNet adapter.

Topic Page

Counters 12

Inputs 12

Outputs 12

Hardware Features 13

Status Indicators 14

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 11

Chapter 1 Module Overview

Counters

Inputs

The module is capable of counting pulses in either direction (forward, reverse, up, down). A maximum of four pulse counters (or two quadrature counters) are available. Each 32-bit counter can count to ±2 billion as a ring or linear counter. In addition to providing a count value, the module provides a rate value up to ±1 MHz, dependent upon the type of input (the L23 packaged controller’s HSC module functionality does not provide rate values). The rate value (as modified by scalar) is the input frequency to the counter. When the count value is increasing, the rate value is positive. When the count value is decreasing, the rate value is negative.

Counters can also be reset or preset to any value between user-defined minimum and maximum values. Preset can be accomplished from the user program or at a Z-input event. The Z-input can also generate a capture value and/or freeze (gate) the counters.

The module features six, high-speed differential inputs labeled ±A0, ±B0, ±Z0, ±A1, ±B1, and ±Z1. These inputs support two quadrature encoders with ABZ inputs and/or up to four discrete count inputs. In addition, x1, x2, and x4 encoder configurations are provided to fully use the capabilities of high resolution quadrature encoders. The inputs can be wired for standard differential line driver output devices, as well as single-ended devices such as limit switches, photo eyes, and proximity sensors. Inputs are optically isolated from the bus and from one another, and have an operational range of 2.6…30V DC.

Outputs

Sixteen outputs are available: four on-board (real) and twelve virtual bits. All 16 outputs can be individually controlled by the module or by the user control program.

The four on-board (real) outputs are DC sourcing, powered by a user-supplied (5…30V DC) power source. These outputs are electronically protected from current overloads and short-circuit conditions. Overcurrent status is monitored and fed back to the user program. Output states are determined by a combination of output data, configuration data, ranges, and overcurrent status.

Output Control Example on page 44 for a description of how the module

See determines output status.

12 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Overview Chapter 1

Hardware Features

The module’s hardware features are illustrated in Figure 1. Refer to Chapter 3 on

page 45 for detailed information on installation and wiring.

For information about the packaged controllers’ hardware features, see the CompactLogix Packaged Controllers Quick Start and User Manual, publication

Figure 1 - Hardware Features

A0 B0

IN OUT

A1 B1Z0Z1

High Speed Counter

Do Not Remove RTB Under Power

Unless Area is Non-Hazardous

Ensure Adjacent Bus Lever is Unlatched/Latched Before/After Removing/Inserting Module

IASIMP-QS010.

DANGER

OUT DC +5V/24V

OUT 0

OUT 1

OUT 2

OUT 3

OUT DC

COM

A0+

A0-

B0+

B0-

Z0+

Z0-

A1+

A1-

B1+

B1-

Z1+

Z1-

1769-HSC

A0 B0

IN OUT

A1 B1Z0Z1

High Speed Counter

Item Description

1 Bus lever

2a Upper panel mounting tab

2b Lower panel mounting tab

3 Module status indicators (6 Input, 4 Output, 1 Fuse, 1 OK)

4 Module door with terminal identification label

5 Removable terminal block (RTB) with finger-safe cover

5a RTB upper-retaining screw

5b RTB lower-retaining screw

6a Movable bus connector (bus interface) with female pins

6b Stationary bus connector (bus interface) with male pins

7 Nameplate label

8a Upper tongue-and-groove slots

8b Lower tongue-and-groove slots

9a Upper DIN-rail latch

9b Lower DIN-rail latch

10 Write-on label for user identification tags

45271

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 13

Chapter 1 Module Overview

Status Indicators

0 2 FUSE

OUT

AO BO ZO

A1 B1 Z1

High Speed Counter

45272

The front panel of the 1769-HSC module has a total of 12 status indicators.

For information about the packaged controllers’ status indicators, see the CompactLogix Packaged Controllers Quick Start and User Manual, publication

Table 1 - Diagnostic Indicators

Indicator Status Description

0 OUT Amber ON/OFF logic status of output 0

1 OUT Amber ON/OFF logic status of output 1

2 OUT Amber ON/OFF logic status of output 2

3 OUT Amber ON/OFF logic status of output 3

FUSE Red Overcurrent

OK Off No power is applied

A0 Amber ON/OFF status of input A0

A1 Amber ON/OFF status of input A1

B0 Amber ON/OFF status of input B0

B1 Amber ON/OFF status of input B1

Z0 Amber ON/OFF status of input Z0

Z1 Amber ON/OFF status of input Z1

ALL ON Possible causes for all status indicators to be On include the following:

IASIMP-QS010.

Red (briefly) Performing self-test

Solid green OK, normal operating condition

Flashing green OK, module in Program or Fault mode

Solid red or amber Hardware error. Cycle power to the module. If problem persists,

Flashing red Recoverable fault. Reconfigure, reset, or perform error recovery.

• Bus error has occurred—controller hard fault. Cycle power.

• During load upgrade of controller—normal operation. Do not cycle power during the

load upgrade.

• All indicators flash on briefly during powerup—normal operation.

replace the module.

Non-critical versus Critical Module Errors on page 113. The

See OK indicator flashes red for all of the error codes in the

Configuration Error Codes table on page 117.

14 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Chapter 2

Module Operation

This chapter details the operation of the 1769-HSC module. We strongly suggest that you review this information before configuring your module.

Topic Page

Counter Defaults 15

Module Operation Block Diagrams 16

Number of Counters 18

Summary of Available Counter Configurations 18

Input Filtering 20

Operational Mode Selection 21

Input Frequency 28

Counter Types 28

Modifying Count Value 29

Rate/Timer Functionality 32

Output Control 36

Counter Defaults

When the module powers up, all output array and configuration array values are set to their default values. Refer to

Chapter 4 on page 65 or Appendix D on page 149 for default values. All input array values are cleared. None of the module data

is retentive through a power cycle.

Power cycling the module has the following effects:

• Clears stored counts and configurations

• Clears faults and flags

• Turns outputs off

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 15

Chapter 2 Module Operation

Module Operation Block Diagrams

To provide an overview of the module operation, the block diagrams indicate relationships between module functions and configuration parameters.

Inputs

The following diagram illustrates how the inputs function.

Input

Filtering

Decoded

NumberOfCounters Operational Mode

Pulse Direction

DirInvert DirInhibit

Discrete Input State

Count

Min/Max and Linear/Ring

Overflow (ResetOvf)

Underflow (ResetUdf)

Store

CtrnConfig.StorageMode_0

RisingEdgeZ (reset REZ)

ZInhibit ZInvert

Enable

CtrnEn

CtrnConfig.StorageMode_1 InputStateZn ‘gating’

Direct Write

HiLimOrDirWr LoadDirectWrite ToThisCounter

Preset

CtrnSoftPreset CtrnConfig.StorageMode_2 and Rising Edge Z

Automatic PresetWarning (Preset Warning)

(1) Resets.

Pulse Interval

(1)

(2) Does not apply topackaged

controller.

(1)

(2)

See page 32 to determine howandwhen to use to calculate rates.

(3)

Rate

Update Time

Scalar

Hysteresis

Rate Valid

Overflow Underflow Preset Direct Write

(3) Does not apply to

packaged controller.

16 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Operation Chapter 2

Outputs

The following diagram illustrates how the outputs function.

Mode

Discrete

On Mask

Off Mask

Feedback

Object Value

Current Count

Current Rate

Ranges

High Limit

Low Limit

Type

Invert

Counter

Active

Output Control

Range Enable

Run

Program

Fault

Mode (Program/Fault/Run)

Overcurrent

Overcurrent Flags

OverCurrentLatchOff

(1)

Output Real Only)

ResetBlownFuse

Readback (Real and Virtual)

Hold Last State

Program Mode Fault Mode

User-defined Safe State

Program State Fault State

Safe State Run

Program State Run Fault State Run

Program to Fault Enable

(1) In the packaged controller, the Type parameter is fixed at Count because the

rate measurement is not supported.

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 17

Chapter 2 Module Operation

Number of Counters

Summary of Available Counter Configurations

The module has six input points: A0, B0, Z0, A1, B1, and Z1. Through these inputs, the module can function with 1, 2, 3, or 4 counters depending upon the number of counters and the operational mode configuration of the input points.

The table summarizes the input configurations available for all counters, based on the number of counters.

No. of Counters Counter Operational Mode Gate or Preset Functionality

1 Counter 0 Any All

1 through 3 Not available

2 Counters 0 Any All

1 Any All

2 and 3 Not available

3 Counters 0 Any All

1 Pulse/Internal Direction All

2 Pulse/Internal Direction None

3 Not available

4 Counters 0 Pulse/Internal Direction All

1 Pulse/Internal Direction All

2 Pulse/Internal Direction None

3 Pulse/Internal Direction None

18 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Operation Chapter 2

The counter options and operating modes are summarized in Figure 2.

Figure 2 - Summary of Available Counters

BO ZO

B1 Z1

Counter 0

Any Mode

Counter 1

Not Available

Counter 0

Any Mode

Counter 1

Pulse

Internal

1 Counter

3 Counters

Counter 2

Not Available

Counter 3

Not Available

(1)

Counter 2

Pulse

Internal

Counter 3

Not Available

(1)

Counter 0

Any Mode

Counter 1

Any Mode

Counter 0

Pulse

Internal

Counter 1

Pulse

Internal

2 Counters

4 Counters

Counter 2

Not Available

Counter 3

Not Available

(1)

Counter 2

Pulse

Internal

Counter

Pulse

Internal

(1)

45273

(1) The number of counters is defined by the NumberOfCounters bits in word 0 of the configuration array.

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 19

Chapter 2 Module Operation

Input Filtering

In many industrial environments, high frequency noise can be inadvertently coupled to the sensor wires. The module can help reject some noise by means of

built-in filters. Inputs are filtered by means of user-selectable, low-pass filters set up during module configuration.

The available nominal pulse width filters are shown in the table.

Input Filter

A0, A1, B0, B1, Z0, Z1 5 ms, 500 s, 10 s, no filter

(7.1 ms, 715 s, 18.5 s, no filter for the packaged controller)

The filters are selected for each input in the Filter Selection word of the module’s configuration array.

TIP

Nom Filter Settings Max Guaranteed Blocked Pulse Width Min Guaranteed Pass Pulse Width

Pulse Width Equivalent

Frequency

No filter 1 MHz N/A N/A 250 ns 2 MHz

10 µs 50 kHz 7.4 µs 67.5 kHz 25 µs 20 kHz

500 µs 1 kHz 370 µs 1.35 kHz 1.25 ms 400 Hz

5 ms 100 Hz 3.7 ms 135 Hz 12.5 ms 40 Hz

(1)

Pulse Width Equivalent

The input state bits (InputStateA0 through InputStateZ1) reflect the filter’s inputs, but are NOT affected by the signal inhibit or invert operations described on page 30.

Frequency

(1)

Pulse Width Equivalent

Frequency

(1)

(1) Equivalent frequency assumes a perfect 50% duty cycle and are for reference purposes only. Hence, the no-filter setting is guaranteed to pass 4 MHz even though the

module’s maximum is 1 MHz. This lets the sensor and wiring to attenuate the pulse to 25% duty cycle while the module maintains pulse recognition.

Nom Filter Settings Max Guaranteed Blocked Pulse Width Min Guaranteed Pass Pulse Width

Pulse Width Equivalent

Frequency

No filter 250 kHz 0.83 µs 600 kHz 2.5 µs 200 kHz

18.5 µs 27 kHz 12.3 µs 40.5 kHz 28.6 µs 17.5 kHz

715 µs 700 Hz 495 µs 1.01 kHz 1.25 ms 400 Hz

7.1 ms 70 Hz 4.95 ms 101 Hz 12.5 ms 40 Hz

(1) Equivalent frequency assumes a perfect 50% duty cycle and are for reference purposes only. Hence, the no-filter setting is guaranteed to pass 4 MHz even though the

module’s maximum is 1 MHz. This lets the sensor and wiring to attenuate the pulse to 25% duty cycle while the module maintains pulse recognition.

(1)

Pulse Width Equivalent

IMPORTANT

Frequency

The built-in filters are simple, averaging, low-pass filters. They are

(1)

Pulse Width Equivalent

Frequency

(1)

designed to block noise pulses of width equal to the values presented in Table Filter Pulse Width and Frequency. Applying full amplitude, 50% duty cycle signals that are of frequency above the selected filter’s threshold frequency can result in an average value signal of sufficient amplitude to turn the input on. A transition from no input to the full amplitude, 50% duty cycle signal (or back to no signal) can result in inadvertent input transitions.

(1) Low-pass filters block frequencies above the threshold frequency.

20 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Operation Chapter 2

Operational Mode Selection

A count channel’s operational mode configuration selection determines how the A and B inputs cause a counter channel to increment or decrement. The six available mode selections are the following:

• Pulse/External Direction Input

• Pulse/Internal Direction Input

• Up and Down Pulse Input

• X1 Quadrature Encoder Input

• X2 Quadrature Encoder Input

• X4 Quadrature Encoder Input

IMPORTANT

The operational mode selection is limited by the number of counters selected.

• With two counters selected, Counters 0 and 1 can be assigned any

operational mode.

• With three counters selected, Counter 0 can be assigned any mode,

but Counters 1 and 2 can only be configured as pulse/internal direction.

• With four counters selected, all counters must be configured for the

pulse/internal direction mode.

See

Figure 2 on page 19 for the operational modes available for the counters,

based on the number of counters configured.

Direction Inhibit and Direction Invert Output Control Bits

These bits apply to all of the counter modes.

TIP

When set, the Direction Inhibit bit disables any physical input from affecting count direction.

When set, the Direction Invert bit changes the direction of the counter in all operational modes.

When Direction Inhibit is set, then Direction Invert is the direction.

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 21

Chapter 2 Module Operation

Pulse/External Direction Mode Selection

In this mode, the B input controls the direction of the counter, as shown in Figure 3. If the B input is low (0), the counter increments on the rising edges of input A. If the input B is high (1), the counter decrements on the rising edges of input A.

TIP

Two Output Control bits let you modify the operation of the B input from your control program or during configuration. The Direction Inhibit bit, when set (1), disables the operation of the B input.

The Direction Invert bit, when set (1), reverses the operation of the B input, but only if the Direction Inhibit bit is not set. If the Direction Inhibit bit is set, then the Direction Invert bit controls counter direction:

• When the Direction Inhibit bit is set (1) and Direction Invert = 0, count

direction is up (forward).

• When the Direction Inhibit bit is set (1) and Direction Invert = 1, count

direction is down (reversed).

Figure 3 - Pulse/External Direction Mode (direction inhibit = 0, direction invert = 0)

Encoder or Sensor

Sensor or Switch

Count Pulse

Direction Control

Input A

Input B

Input Z

Direction Control High = Decrement Low = Increment

22 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Count

Table 2 - Pulse External Direction Counting

Module Operation Chapter 2

Direction Inhibit Bit

00 0 or open 1

01 0 or open -1

10 0 or open 1

11 0 or open -1

Direction Invert Bit

Input A (count) Input B (direction) Change in

Count Value

 1-1 0, 1,  Don’t care 0

 11 0, 1,  Don’t care 0

 1-1 0, 1,  Don’t care 0

See Direction Inhibit and Direction Invert Output Control Bits on page 21 for more information.

Pulse/Internal Direction Mode Selection

When the Pulse/Internal Direction mode is selected, the status of the Direction Invert bit, as controlled by the user program, determines the direction of the counter. The counter increments on the rising edge of the module’s A input when the Direction Invert bit is reset (0). The counter decrements on the rising edge of the A input when the Direction Invert bit is set (1).

Table 3 - Pulse Internal Direction Counting - Counters 0 and 1

Direction Inhibit Bit

Don’t care 0  Don’t care 1

Don’t care 1  Don’t care -1

Table 4 - Pulse Internal Direction Counting - Counters 2 and 3

Direction Inhibit Bit

Don’t care 0 Don’t care  1

Don’t care 1 Don’t care  -1

Direction Invert Bit

Input A (count) Input B Change in Count

Value

0, 1,  Don’t care 0

Input A Input B (count) Change in Count

Value

Don’t care 0, 1,  0

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 23

Chapter 2 Module Operation

Up and Down Pulses Mode Selection

In this mode, the counter channel increments on the rising edge of pulses applied to input A and decrements on the rising edge of pulses applied to input B. When set, the Direction Inhibit bit causes both A and B to increment. When set, the Direction Invert bit causes B to increment and A to decrement. When the Direction Invert and Direction Inhibit bits are both set, both A and B decrement.

TIP

When both inputs transition simultaneously or near simultaneously, the net result is no change to the count value.

Figure4-UpandDown Pulse Mode (direction inhibit = 0, direction invert = 0)

Input A

Input B

Input Z

Module

Incrementing Encoder

Decrementing Encoder or

Increment Pulse

(Input A)

Decrement Pulse

(Input B)

Count

Increment Pulse

(count up)

or Sensor

Decrement Pulse

(count down)

Sensor

24 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Table5-UpandDown Counting

Module Operation Chapter 2

Direction Inhibit Bit

00 0, 1,  1

01 0, 1,  -1

10 0, 1,  1

11 0, 1,  -1

Direction Invert Bit

Input A (count) Input B (direction) Change in

Count Value

0, 1,  -1  0

0, 1,  1  0

0, 1,  -1  0

X1 Quadrature Encoder Mode Selection

In this mode, when a quadrature encoder is attached to inputs A and B, the count direction is determined by the phase relation of inputs A and B. If A leads B, the counter increments. If B leads A, the counter decrements. In other words, when B is low, the count increments on the rising edge of input A and decrements on the falling edge of input A. If B is high, all rising transitions on input A are ignored. The counter changes value only on one edge of input A as shown in Figure 5.

TIP

When both A and B transition at the same time, instead of in the defined 90° phase separation, the quadrature signal is invalid.

For more information see

Direction Inhibit and Direction Invert Output

Control Bits on page 21 and their effect on Quadrature signals on page 27.

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 25

Chapter 2 Module Operation

Figure 5 - Quadrature Encoder Modes (direction inhibit = 0, direction invert = 0)

Quadrature

Encoder

Forward Rotation

X1 Count

X2 Count

X4 Count

X2 Quadrature Encoder Mode Selection

Input A

Input B

Input Z

Reverse Rotation

The X2 Quadrature Encoder mode operates much like the X1 Quadrature Encoder except that the resolution is doubled as shown in Figure 5 on

page 26.

X4 Quadrature Encoder Mode Selection

The X4 Quadrature Encoder mode operates much like the X1 Quadrature Encoder except that the resolution is quadrupled, as shown in Figure 5 on

page 26.

Figure 6 shows how Direction Inhibit and Direction Invert affect the counter.

26 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Operation Chapter 2

Figure 6 - Operation Using Various Direction Inhibit and Direction Invert Settings

Quadrature

Encoder

Forward Rotation

DirectionInhibit = 0; DirectionInvert = 0

X1 Count Pulse

X2 Count Pulse

X4 Count Pulse

DirectionInhibit = 0; DirectionInvert = 1

Input A

Input B

Input Z

Reverse Rotation

X1 Count Pulse

X2 Count Pulse

X4 Count Pulse

DirectionInhibit = 1; DirectionInvert = 0

X1 Count Pulse

X2 Count Pulse

X4 Count Pulse

DirectionInhibit = 1; DirectionInvert = 1

X1 Count Pulse

X2 Count Pulse

X4 Count Pulse

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 27

Chapter 2 Module Operation

Input Frequency

Counter Types

Maximum input frequency is determined by the input configuration as shown in the table.

Input Configuration Input Frequency

1769-HSC Module

X4 Quadrature encoder 250 kHz 250 kHz

X2 Quadrature encoder 500 kHz 250 kHz

All other configurations 1 MHz 250 kHz

Input Frequency Packaged Controller

Each of the four possible counters can be configured to stop counting and set a flag at its limits (linear counter) or to rollover and set a flag at its limits (ring counter). A counter’s limits are programmed by the CtrnMaxCount and CtrnMinCount words in the module’s configuration array. Both types are described below.

Linear Counter

Figure 7 illustrates linear counter operation. In linear operation, the current count (Ctr[n].CurrentCount) value remains between, or equal to, the user-programmed minimum count (CtrnMinCount) and maximum count (CtrnMaxCount) values. If the Ctr[n].CurrentCount value goes above (>) or below (<) these values, the counter stops counting, and an overflow/underflow bit is set. The overflow/underflow bits can be reset using the CtrnResetCounterOverflow and CtrnResetCounterUnderflow bits.

Figure 7 - Linear Counter Diagram

Minimum Count Value

Underflow and Hold

Count Up

Counter Value

Count Down

Maximum Count Value

Overflow and Hold

Pulses are not accumulated in an overflow/underflow state. The counter begins counting again when pulses are applied in the proper direction. For example, if you exceed the maximum by 1000 counts, you do not need to apply 1000 counts in the opposite direction before the counter begins counting down. The first pulse in the opposite direction decrements the counter.

28 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

Module Operation Chapter 2

Ring Counter

Figure 8 demonstrates ring counter operation. In ring counter operation, the current count (Ctr[n].CurrentCount) value changes between user-programmable minimum count (CtrnMinCount) and maximum count (CtrnMaxCount) values. If, when counting up, the counter reaches the CtrnMaxCount value, it rolls over to the CtrnMinCount value upon receiving the next count and sets the overflow bit. If, when counting down, the counter reaches the CtrnMinCount value, it rolls under to the CtrnMaxCount value upon receiving the next count and sets the underflow bit. These bits can be reset using the CtrnResetCounterOverflow and CtrnResetCounterUnderflow bits.

Figure 8 - Ring Counter Diagram

Modifying Count Value

Maximum Count Value

Rollover

Count Down

Minimum Count Value

Count Up

The count value (Ctr[n].CurrentCount) can be stored, reset, or preset using the Z-input, CtrReset bit in the configuration array, control bits in the output array, or overwritten using a Direct Write command.

Table6-Available Z Functions

Setting For function

(1)

Store

Hold WhileZ=1,hold counter at its current value

Preset/Reset On rising edge of Z, preset the count value to the value in the preset word

(1) If both a store and preset function are configured, the stored count is captured before the preset operation

takes place.

On rising edge of Z, store count in the Stored Count input word

IMPORTANT

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 29

Because only the Z-inputs are used for external gating and presetting, these functions are not available for Counters 2 and 3, which do not have Z-inputs. All options are always available for Counters 0 and 1, regardless of input operational mode.

Chapter 2 Module Operation

Counter Enable/Disable

The counter can be enabled or disabled using the CtrnEn control bit. Be aware that disabling the counter does not inhibit any current count loading functions (for example, preset or direct write) or any Z function.

Z Input Functions

There are three Z input functions: store, gate, and Z preset.

Store

The Z-input can be used to capture the current count value even when the counter is counting at full 1 MHz speed.

Gate

The Z-inputs can be used to gate (hold) the counter at its current value regardless of incoming A or B inputs. A gating function is typically one that lets pulses reach the counter (gate open) or not (gate closed).

Z Preset

Preset can be programmed to occur based on the actions of the Z-input signal.

Inhibit and Invert

The Z-input signals can be inverted and/or inhibited, depending on the user configuration of the CtrnZInvert and CtrnZInhibit output control bits. If the signal is inhibited, the invert bit is the Z signal for the actions described above.

For an explanation of those bits, see

Z Inh - Z Inhibit (CtrnZInhibit) on page 93.

and

Z Inv - Z Invert (CtrnZInvert) on page 93

Direct Write

You can arbitrarily change the current count value (Ctr[n].CurrentCount) to the direct write control value (Range12To15[n].HiLimOrDirWr). This ability applies to ranges 12…15. The direct write value takes effect when the Load Direct Write bit (Range12To15[n].LoadDirectWrite) transitions from 0 to 1.

If you attempt to preset and load direct write to a counter at the same time, only the preset (CtrnPreset) will take effect.

30 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013

+ 140 hidden pages