Rockwell Automation 1756-HSC User Manual

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Page 1

User Manual

ControlLogix High-speed Counter Module

Catalog Numbers 1756-HSC

Page 2

Important User Information

IMPORTANT

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 SGI-1.1 your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/ 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.

available from

) describes some

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

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 may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.

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

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

Allen-Bradley, Rockwell Software, Rockwell Automation, ControlLogix, RSLogix , Logix5000, PHOTOSWITCH, RSNetWorx, and TechConnect are trademarks of Rockwell Automation, Inc.

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

Page 3

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 Page

The Attention and Warning tables have been updated. 39

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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4 Summary of Changes

Notes:

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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Preface

1756-HSC Module Features

Counter Modes

About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chapter 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

What is a High-speed Counter Module? . . . . . . . . . . . . . . . . . . . . . . . . 11

Encoder and Sensor Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1756-HSC/B Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Additional I/O Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1756-HSC Parts Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Counter/Encoder Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Counter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Encoder Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Preset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Rollover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Input Z (Gate/Reset) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Storage Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Assign Outputs to Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Frequency Modes

Install and Wire the ControlLogix High-speed Counter Module

Chapter 3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Frequency Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Frequency Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Sample Period for Frequency Mode . . . . . . . . . . . . . . . . . . . . . . . . 31

Period Rate and

Continuous Rate Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Sample Period for Period/Continuous Rate Modes . . . . . . . . . . . 33

Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Period Rate /Continuous Rate Output Examples . . . . . . . . . . . . . . . . 36

Maximum Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chapter 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Install the 1756-HSC Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Key the Removable

Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Wiring the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Connect the Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Connect Ungrounded End of the Cable. . . . . . . . . . . . . . . . . . . . . 45

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6 Table of Contents

Configure the 1756-HSC Module

Two Types of RTBs (each RTB comes with housing) . . . . . . . . . 46

Recommendations for Wiring Your RTB . . . . . . . . . . . . . . . . . . . 47

Wire Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Wire an Allen-Bradley 845 Incremental Encoder . . . . . . . . . . . . . 47

Wire an Allen-Bradley Bulletin 872 3-Wire DC Proximity Sensor 48

Wire a PHOTOSWITCH Series 10,000 Photoelectric Sensor . . . 49

Assemble the Removable Terminal Block and Housing . . . . . . . . . . . 50

Install the Removable Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . 51

Remove the Removable Terminal Block . . . . . . . . . . . . . . . . . . . . . . . 52

Remove the Module

from the Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Chapter 5

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

ControlLogix Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Direct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Local Chassis Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Remote Chassis Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Use the Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Configure a 1756-HSC/B, Module by using

RSLogix 5000 Software, Version 18 and Later. . . . . . . . . . . . . . . . . . . 59

Communication Format Options. . . . . . . . . . . . . . . . . . . . . . . . . . 62

Set RPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Set Up Counter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Filter Selections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Set Up Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Copy Configuration (.C) Output, Rollover, Preset Tags to Output (.O)

Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Download Configuration

to the 1756-HSC Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Module Diagnostics

1756-HSC Status Indicators

1756-HSC Data Structures

Chapter 6

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

1756-HSC Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

RSLogix 5000 Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Fault Type Determination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Troubleshoot the 1756-HSC Module . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Appendix A

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Appendix B

Configuration,Output,Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

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1756-HSC Module History

Application Considerations

Table of Contents 7

Configuration Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Output Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Input Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Appendix C

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

1756-HSC Profile Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Configure a Generic Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Copy ACD file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Add Ladder Logic Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Upgrade Module to Software Version 18 and Later . . . . . . . . . . 101

Edit Thin Profile Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Change Configuration Data via Message

Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Appendix D

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Types of Input Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Examples for Selecting Input Devices . . . . . . . . . . . . . . . . . . . . . . . . 106

Circuit Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Detailed Circuit Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

5V Differential Line Driver Example. . . . . . . . . . . . . . . . . . . . . . 108

+12 to +24V Single-ended Driver . . . . . . . . . . . . . . . . . . . . . . . . 109

Open Collector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Electromechanical Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Output Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Input Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Totem-pole Output Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Cable Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Cable Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Cable Length and Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Glossary

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

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8 Table of Contents

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Preface

O K

COUNTER

DC I/O

ABZ

00O111

01OO23

About This Publication

HSC Module Firmware 3.x Configurations

If you have module

Using firmware revision

Series B

And your desired functionality is

The 1756 High-speed Counter module counts incoming pulses from pulse generators, counters, limit switches, and other devices, and can either return a count to the controller or activate on-board outputs for a specific action depending on your application. In the rest of this manual, we refer to the High-speed Counter module as the 1756-HSC module.

The chapters in this manual focus on the configuration and operation of a

ControlLogix

1756-HSC/B module, firmware revision 3.x or later using

RSLogix™ 5000 software version 18 or later. Additional capabilities of the 1756-HSC module are highlighted in the appendices, including revised output tags and electrical schematics.

The table outlines the profiles for the 1756-HSC/B module based on your firmware and software configurations.

If you are using the ‘original’ 1756-HSC/A module, with either firmware revision 1.x or 2.x, see

Then use the Logix5000™ profile Comment

Versions earlier than 15 => Thin profile/tags only Exact Match Keying

Original

(1)

Version 15…17 => Full profile support Version 18 and later => Select Major Revision 3 and

HSC Data Comm Format

Appendix C

for details.

not supported

3.x

Rollover and Preset

in Output Tags

Versions earlier than 18 => Use generic profile/ HSC ACD file

(2)

Version 18 and later => Select Major Revision 3 and

Period/Continuous Rate

HSC Data-extended Comm Format

Totalizer

(1)

Original means the features and module behavior in the initial release of the 1756-HSC/A module, firmware revision 1.x functions and tags. See

(2)

File is located at

Who Should Use This Manual

http://samplecode.rockwellautomation.com.

You must be able to program and operate an Allen-Bradley® ControlLogix controller and various Allen-Bradley encoders and sensors to efficiently use your 1756-HSC module. In this manual, we assume that you know how to use

Appendix C

for details.

these products. If you do not, refer to the related user publications for each product, before you attempt to use the 1756-HSC module.

9Publication 1756-UM007C-EN-P - November 2011 9

Page 10

Preface

Additional Resources

These documents provide information related to the ControlLogix High-speed Counter Module.

Resource Description

1756 ControlLogix I/O Technical Data, publication 1756-TD002

ControlLogix System User Manual, publication

ControlLogix Digital I/O Modules User Manual, publication

ControlLogix Analog I/O Modules User Manual, publication

1756-UM001

1756-UM058

1756-UM009

Provides specifications for the ControlLogix controllers, I/O modules, specialty modules, chassis, power supplies and accessories.

Detailed description of how to use your ControlLogix operating system.

Detailed description of how to install and use ControlLogix digital I/O Modules.

Detailed description of how to install and use ControlLogix analog I/O Modules.

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 office.

10 Publication 1756-UM007C-EN-P - November 2011

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1756-HSC Module Features

Chapter

Introduction

What is a High-speed Counter Module?

The High-speed Counter Module (catalog number 1756-HSC) performs high-speed counting for industrial applications. This chapter provides an overview of the design and features of the 1756-HSC/B module.

For other module series, firmware, and/or software information, see

Appendix C

Topic Page

What is a High-speed Counter Module? 11 Encoder and Sensor Compatibility 13 1756-HSC/B Module Features 13

The 1756-HSC module counts pulses by using a Counter or Frequency operational mode. The counts are presented as either ‘accumulated count’ or ‘frequency’ depending on the mode that is configured for the module.

You can choose from either one of three Counter modes or one of three Frequency modes when configuring the module. The operational mode selected determines how the pulse count is stored and the behavior of the outputs.

You can manipulate the storage of the count values (detailed in 1756-HSC module evaluates these count values against user configured presets and/or values, thus the response time for activating outputs is performed at a faster rate than evaluating in the controller.

Configuration tags, which are automatically installed with the 1756-HSC module during the initial download in RSLogix 5000 programming software, determine whether the module interprets pulses as:

• accumulated count - values can be 1…16 million.

• frequency - positive or negative depending on the direction of the rotation.

Pulse count values can be calculated by using different types of Counter and Frequency modes. The simple counter uses only input A to count pulses. An encoder uses both input A and input B to count pulses. The relationship between the two channels is how the encoder determines if the count is positive (clockwise) or negative (counterclockwise).

11Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

Chapter 2

). The

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12 1756-HSC Module Features

This user manual also details the Frequency operational modes that are available depending on which one is required for your application. Frequency can be calculated in one of three ways:

• frequency (rate measurement).

•period rate.

• continuous rate.

All three Frequency modes determine the frequency of input pulses by counting pulses over a user-defined time interval. If the revolution is spinning in a clockwise direction, the frequency is positive; in a counterclockwise direction it’s decreasing (negative) frequency.

See

page 29

Pulse counts and frequency values are stored in one of three input tags (based on the mode) as shown in the table.

Mode and Input Tag Values for the 1756-HSC/B Module

for more details on Frequency modes.

Comm Format = HSC Data-extended Tags

Mode Mode Description Present Value Stored Value Totalizer

0 Counter 1 Encoder X1

Accumulated count Stored value

Directional frequency

2 Encoder X4 3 Counter Not Used N/A N/A N/A 4 Frequency

(Rate Measurement)

5 Frequency

(Period Rate)

6 Frequency

(Continuous Rate)

(1)

Modes where frequency controls the outputs.

(2)

B-input state defines direction (Counter mode).

(3)

Rollover/Preset settings apply.

(1)

See

No. of input pulses occurring

(1)

in sample period

No. of 4 MHz pulses occurring in sample period

1756-HSC Data Structures

Accumulated count

Frequency

Accumulated count

in Appendix C for a list of tags.

(2)

(3)

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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1756-HSC Module Features 13

Encoder and Sensor Compatibility

1756-HSC/B Module

The most common applications using the 1756-HSC module also use the following Allen-Bradley products:

• Allen-Bradley 845 incremental encoder

• Allen-Bradley Bulletin 872 three-wire DC proximity sensor

•PHOTOSWITCH

series 10,000 photoelectric sensor

Additional encoders and sensors may be connected to and used with the ControlLogix 1756-HSC module. For specific compatibility of other encoder and sensor compatibility, check the user publications for each product or consult your local Allen-Bradley representative.

The table shows the type of encoder or sensor that you can choose for your module.

Pulse Width, Min Frequency Range Leakage Current

Proximity 500 ns 1 MHz 250 A @ 5V DC Quad Encoder 2 s 250 kHz 250 A @ 5V DC

This table highlights features of the 1756-HSC/B module.

Features

Feature Description

Real-time manipulation of preset/rollover tag settings

Period rate / Continuous Rate frequencies Both Frequency modes are available with

Module-specific tags Tags are automatically created when you

Preset and Rollover tags, which provide a reference point to start the count and reset the count to zero, respectively, are included in the Configuration tags at the initial system configuration. The 1756-HSC/B module also has both tags in the Output tag settings to allow the values to be changed in real-time when the 1756-HSC Data-extended Comm Format is selected. This feature provides the flexibility of changing counter settings ‘on-the-fly’ without having to re-configure all system tags.

the 1756-HSC/B module when using the Data-extended Comm Format. Period Rate mode counts internal 4 MHz clock pulses over a used-defined time frame to determine frequency. Continuous Rate mode is similar to Period Rate mode except dynamic outputs can be turned On /Off at pre-determined pulse intervals.

add a 1756-HSC module to your Logix5000 project. The 1756-HSC module has very descriptive tags for using pulse and frequency values, such as Present Value, Stored Value, and Totalizer.

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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14 1756-HSC Module Features

Additional I/O Module Features

The following items are additional features for ControlLogix I/O modules, including the 1756-HSC module.

Feature Description

Configuration software RSLogix 5000 software has a custom interface to configure

your module. All module features can be enabled and disabled through the software.

Module fault reporting I/O modules provide both hardware and software

indications when a module fault occurs. Status indicators signal fault conditions. The RSLogix 5000 programming software describes the fault message so you know what action to take to resume normal operation.

Status indicators Status indicators on the front of the module report the

operational status of the 1756-HSC module. The input-point status display indicates a particular point’s status, including specifics for the input A, B, and Z (reset) points for each channel of the 1756-HSC module. The output-point status display indicates the status of four output points on the 1756-HSC module.

Producer/consumer model Logix5000 controllers let you produce (broadcast) and

consume (receive) system-shared tags. The 1756-HSC module can produce data without having to be polled first by a controller. The 1756-HSC module produces the data and

any owner-controller device can decide to consume it. Electronic Keying See RIUP RIUP is an abbreviation for removal and insertion under

page 73

in Chapter 5 for details.

power. The module can be inserted and removed from the

chassis while power is applied. This flexibility allows you to

maintain the module, either removing or inserting, without

disrupting the rest of the controlled process.

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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1756-HSC Parts Illustration

41623

1756-HSC Module Features 15

Item Description

1 Backplane connector - The backplane interface for the ControlLogix

system connects the module to the backplane.

2 Top and bottom guides - Guides provide assistance in seating the

removable terminal block (RTB) onto the module.

3 Connector pins - Input/output, power, and grounding connections are

made to the module through these pins with the use of an RTB.

4 Status indicators - Indicators display the status of communication, module

health, and presence of input/output devices. Use these indicators to help in troubleshooting.

5 Locking tab - The locking tab anchors the RTB on the module, maintaining

6 Slots for keying - The slots let you mechanically key the RTB to prevent

wiring connections.

inadvertently making the wrong wire connections to your module.

7 Removable terminal block - The RTB lets you connect and house the

wiring. There are several types of RTBs.

See

page 46

for details on RTB types.

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16 1756-HSC Module Features

Notes:

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

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Counter Modes

Chapter

Introduction

This chapter describes the Counter modes for the 1756-HSC/B module. Topics include:

• types of counting: counter and encoder.

• means of storing the counts.

• modes for manipulating the count.

• tags for control of on-board outputs.

Topic Page

Counter Mode 19 Encoder Mode 20

Preset 22

Rollover 22 Input Z (Gate/Reset) 23

Outputs 26

There are three Counter modes that can be selected from the Operational Mode pull-down menu on the Counter Configuration tab. See

Chapter 5

for configuration details.

Counter/Encoder Overview

The choices are:

• Counter mode (default).

• Encoder x1 mode.

• Encoder x4 mode.

The Encoder and Counter modes are virtually identical; the only difference is the method used to count. There are two counters (using input A and B) per module. Input Z, which is described in more detail later in this chapter, basically affects how the counts are stored based on the selected Storage mode.

In Counter mode, the module reads incoming pulses from input A only and stores the accumulated count value in the Present Value tag. The state of input B determines whether to increment or decrement the count based on whether it’s low, floating (count up) or high (count down).

In both Encoder modes, the 1756-HSC module uses two channels to read incoming pulses. The module uses the phase relationship between inputs A and B to determine the count value and direction of the rotation.

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18 Counter Modes

Where Count Values are Stored in Tags

Mode Description Present Value Tag Stored Value Tag Totalizer Tag

Counter

Encoder x4

• Encoder x1- This is a Bidirectional Count mode, counting up or down, using an incremental encoder with direction output.

• Encoder x4 - This is a Bidirectional Count mode, using quadrature encoder signals, with four times the resolution of X1.

The 1756-HSC/B module also offers the convenience of showing directional frequency by using any Counter mode. If the count value is increasing, the frequency is positive in the Totalizer tag. If the count value is decreasing, the frequency is negative in the Totalizer tag.

Accumulated Count Stored Value Directional FrequencyEncoder x1

There are several methods for using and manipulating the count values. Based on the state of the Z-input, the 1756-HSC module provides four modes of behavior if the application requires storage of the accumulated count value.

Store and Continue Mode

•

Store, Wait, and Resume

•

Store and Reset, Wait, and Start

•

Store and Reset, and Start

In addition, the 1756-HSC module features two software-configurable tags that provide control of the starting and ending points of an accumulated count sequence. These are the tags:

Preset

•

Rollover

The remainder of this chapter details each mode and the different configurations that you can use for specific needs of your 1756-HSC/B module.

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Counter Modes 19

Single-phase Pulse Generator

Count Up Count Down

1756-HSC Module

Increment/Decrement Count

Input A

Input B

Input A

Input B

–

... 1 2 3 012

41688

Accumulated Count in Present Value Tag

Positive Frequency

Negative Frequency

Directional Frequency in Totalizer Tag

Input Z (optional)

Pulse Count

...

Counter Mode

This is the 1756-HSC module’s default operational mode that counts incoming pulses using input A. You can control the starting and ending points of the accumulated count depending on how you have configured the module.

In the Counter mode, the count increases or decreases based on the state of input B, which can be a random signal. If input B is high, the counter will count down. If input B is low or floating (that is, not connected to a voltage source), the counter counts up. Counting is done on the leading-edge of input A.

Input B Direction of Counter

High Down Low or floating (not connected) Up

Input Z is used in Counter mode only if a Store Count mode is enabled.

page 23

See

for details on the Storage modes.

Counter Mode

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20 Counter Modes

Encoder

Input A

Input B

Input A

Input B

B Leads A 90°

A Leads B 90°

Input A

Input B

123 210

1756-HSC Module

Change

Accumulated Count in Present Value Tag

Directional Frequency in Totalizer Tag

Positive Frequency Negative Frequency

44889

. . .

Input Z (optional)

Encoder Mode

Encoder mode also counts incoming pulses. However, the phase relationship between two input channels (A and B) determines whether the direction of the count is up or down.

In Encoder x1 mode, an increasing count results when channel B is 90° ahead of channel A. The count is initiated on the rising edge of channel A, and the direction of the encoder is clockwise (positive).

The module produces a decreasing count when channel A is 90° ahead of channel B. The count is initiated on the falling edge of channel A, and the direction is counterclockwise (negative).

By monitoring both the number of pulses and the phase relationships of signals A and B, you can accurately determine the position and direction of the rotation.

The illustration shows the phase relationships between channels A and B for the x1 mode. Input Z is used in Encoder mode only if a Store Count mode is

page 23

enabled. See

for details on the Storage modes.

Encoder x1 Mode

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Page 21

Counter Modes 21

Input A

Quadrature Encoder

1756-HSC Module

Input B

Input A

Input B

Input A

Input B

B Leads A 90° A Leads B 90°

1 2 3 4 5 6 7 8 9 10 11 12 1234567891011 0

41689

Accumulated Count in Present Value Tag

Directional Frequency in Totalizer Tag

Positive Frequency Negative Frequency

Input Z (optional)

Encoder x4

Encoder x4 mode is identical to x1, except this mode counts on the leading and trailing edges of A and B to provide a greater number of pulse counts. The greater the number of pulse counts the better the module can determine position.

Input Z is used in Encoder mode only if a Store Count mode is enabled.

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See

Encoder x4 Mode

for details on the storage modes.

Maximum frequency in Encoder x1 and x4 modes = 250 kHz (assuming 50% duty cycle), with a minimum pulse width at this frequency of 2 s. The

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module assumes a 90° phase (A/B°) difference between channels.

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22 Counter Modes

Preset

Each of the two counters has one preset value associated with it. In the Encoder or Counter modes, the preset value represents a reference point (or value) from which the module begins counting. The module can count either up or down from the preset value.

The preset value itself is entered during module configuration. However, you must enter a preset command from either the RSLogix 5000 programming software or ladder logic before it becomes active. Setting the Preset Enable Bit in the Output tag to ‘1’ will send the preset value to the Present Value tag.

Preset values are entered on the Counter Configuration tab of the Module Properties dialog box.

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See

Preset in Output tag

When using the HSC Data-extended Comm Format while configuring the module, the Preset tag will be found in both the Configuration and Output tag areas.

for an example of the Counter Configuration tab.

The Configuration tag value is populated during software configuration with the Logix5000 controller, and sent to the module upon powerup, defining its behavior. This value will continue to define module behavior as long as the corresponding tag in the output area is zero.

If the value of the Preset tag in the output area is changed to a non-zero value, the module will disregard the value sent from the configuration area and use the value in the output area instead. This facilitates easier real-time ‘on-the-fly’ changes to the preset function.

Rollover

Each of the two counters has one rollover value associated with it. When the accumulated count value in the Rollover tag reaches the rollover value, it resets to zero (0) and begins counting again. The rollover value is circular (for example, if the rollover value = 360, the count will be from 358, 359, 0, 1, and so forth, in a positive direction and from 1, 0, 359, 358, and so forth, in a negative direction).

Rollover values are entered on the Counter Configuration tab of the Module Properties dialog box in the RSLogix 5000 programming software or can be changed in ladder logic.

page 65

See

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

for an example of the Counter Configuration tab.

Page 23

Counter Modes 23

IMPORTANT

Rollover in Output tag

When using the HSC Data-extended Comm Format while configuring the module, the Rollover tag will be found in both the Configuration and Output tag areas.

If the value of the Rollover tag in the Output area is changed to a non-zero value, the module will disregard the value sent from the Configuration area and use the value in the Output area instead. This facilitates easier real-time ‘on-the-fly’ changes to the Rollover function.

Input Z (Gate/Reset)

Input Z, when active, will change the behavior of an accumulated count value in the Present Value tag, depending upon which of four modes is selected.

Store and Continue Mode

•

Store, Wait, and Resume

•

Store and Reset, Wait, and Start

•

Store and Reset, and Start

The Storage modes are selected on the Counter Configuration tab on the Module Properties dialog box of the RSLogix 5000 programming software.

Storage Modes

The store count feature allows the module to store the current count value and follow four behavioral paths, depending on which Store mode is selected. The store count is triggered by the state of the Z-input (the gate) on the module.

The four modes can be changed while normal module operation continues. Improper use of on-the-fly changes may cause unintended machine operation when the store count is used as a trigger for machine sequencing.

The following illustrations show how the different modes store count values in the Present Value and Stored Value tags.

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24 Counter Modes

...10

Stored Value Tag in Logix Controller

Present Value Tag in Logix Controller

Z-Input

44900

11 12 13 14 15 16 17 18 19 20

...8 81313131313181818

Incoming Pulses

10 11 12 13 14 15 16 17 18 19 20

44901

Present Value Tag in Logix Controller

Stored Value Tag in Logix Controller

Z-Input

...1111

11 11

12 13 14 14 14 15 16

11 11 14 14 14 14 14

Incoming Pulses

10 11 12 13 14 15 16 17 18 19 20

Store and Continue Mode

In the Store and Continue mode, the module:

• reads the Present Value and places it into the Stored Value on the leading edge of Input Z.

• continues to accumulate the Present Value based on presets and incoming pulses.

• retains the Stored Value until it is overwritten by new data from the next leading edge of a pulse on Input Z.

Store, Wait, and Resume

In the Store, Wait and Resume mode, the module:

• reads the Present Value and places it into the Stored Value on the leading edge of Input Z.

• stops accumulating the count in the Present Value as long as the Z-input is high.

• resumes accumulating the count in the Present Value when the Z-input goes low.

• retains the Stored Value until it is overwritten by new data from the next leading edge of a pulse on Input Z.

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Counter Modes 25

Present Value Tag in Logix Controller

Stored Value Tag in Logix Controller

Z-Input

10 11 0 1 2 3 0 0 1 2

...11111111113 3 3 3 3

44902

Incoming Pulses

00 0

10 11 12 13 14 15 16 17 18 19 20

Present Value Tag in Logix Controller

Stored Value Tag in Logix Controller

Z-Input

...1111

01 2 3 4 0512

511 11 11 11 5 5 5 5

44903

10 11 12 13 14 15 16 17 18 19 20

Incoming Pulses

Store and Reset, Wait, and Start

In the Store and Reset, Wait, and Start mode, the module:

• reads the Present Value and places it into the Stored Value on the leading edge of Input Z and resets the count to zero (0) in the Present Value.

• resumes normal counting from zero (0) after the Z-Input goes low.

• retains the Stored Value until it is overwritten by new data from the next leading edge of a pulse on Input Z.

Store and Reset, and Start

In the Store and Reset, and Start mode, the module:

• reads the Present Value and places it into the Stored Value on the leading edge of Input Z and resets the count to zero (0) in Present Value.

• resumes counting from zero (0) regardless of the state of the Z-input.

• retains the Stored Value until it is overwritten by new data from the next leading edge of a pulse on Input Z.

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26 Counter Modes

IMPORTANT

You have the option of selecting either the rising or falling edge of the gate/reset pulse. When the Invert Z Value box is checked on the Counter Configuration tab, the state of the Z input is reversed as illustrated in the four Store modes.

For example, in the Store and Reset, and Start mode using the Invert Z, the falling edge of the pulse on Input Z will store the count value in the Stored Value tag and reset the Present Value tag to zero. The counter continues to count while the gate pin is low or high, but the present value is reset to zero (0) on the next falling edge of Input Z.

Outputs

The module has four outputs, isolated in pairs (0 and 1, 2 and 3). Each output is capable of sourcing current from an externally supplied voltage up to 30V DC. You must connect an external power supply to each of the output pairs. The outputs can source 1 A DC and are hardware-driven. They turn On or Off in less than 50 s when the appropriate count value has been reached.

Assign Outputs to Counters

By using configuration tags or the RSLogix 5000 software defaults, you can assign the outputs on the module to any of the various counters. You can assign as many as two outputs to a given counter. However, an output may be assigned only once to a counter; it’s not possible to use the same output with two different counters.

Each output on the 1756-HSC module can be turned On and Off at your discretion. The operation of outputs tied to a counter (on the Output Configuration tab of the Module Properties dialog box) are performed independently from the controller scans.

Output Operation

When the outputs for the module are enabled and assigned to a counter, they operate in an On-Off fashion. Up to two On-Off windows may be used for each output. The outputs use a comparison of the Present Value to the values you have programmed in one or both of the following tags:

• First Value Output Turns On and First Value Output Turns OFF

• Second Value Output Turns ON and Second Value Output Turns OFF

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Counter Modes 27

2001…4999

5000

2000

10686

Accumulated Count in Present Value Tag

For example, the ‘Output Turns ON’ tag is set for a value of 2000 and the ‘Output Turns OFF’ tag is set for a value of 5000.

In the illustration, the:

• output turns On at the Present Value of 2000.

• output remains energized for 3000 additional counts.

• output turns Off at the Present Value of 5000.

Tying Outputs to Counters

You can jumper any of the outputs to any of the counter inputs on the module’s RTB. In this way, it is possible to use the outputs to reset a counter or to cascade counters. If using the outputs this way, make certain that the correct input terminals are used to interface with the appropriate output voltage.

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28 Counter Modes

Notes:

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Frequency Modes

Chapter

Introduction

This chapter describes the frequency modes that are available with the 1756-HSC/B module when using the HSC Data-extended Comm Format.

The Frequency modes are:

• Frequency - number of input pulses per user-defined time interval.

• Period Rate - number of sampled, internal 4 MHz pulses per user-defined number of incoming pulses, with outputs updated at the end of the sample period with the Present Value, Totalizer, and Stored Value tags.

• Continuous Rate - number of sampled, internal 4 MHz pulses per user-defined number of incoming pulses, with outputs updated throughout the sample period. The Present Value, Totalizer, and Stored Value tags are updated only at the end of the sample period.

Topic Page

Frequency Mode 30 Period Rate and Continuous Rate Modes 32 Output Operation 35 Period Rate /Continuous Rate Output Examples 36

Frequency Overview

Each of the three Frequency modes use incoming pulse counts in a user-defined interval to determine frequency values. The Stored Value tag contains the calculated frequency and is always positive.

You can select one of three Frequency-operational modes based on the frequency of the incoming signal. Frequency mode is best suited for calculating higher frequencies because you define the sample period used to count incoming pulses. At higher frequencies, there are a greater number of pulses to be sampled that results in the ability to calculate frequency at a higher resolution. The Stored Value tag is updated at the end of the selected sample period.

Period Rate and Continuous Rate modes use an internal 4 MHz clock and a user-defined number of incoming pulses configured by the Scaler value that results in better performance at lower frequencies, where more 4 MHz pulses are accumulated. Higher Scaler values also help to improve the calculation of high frequency signals as longer pulse durations provide for more 4 MHz pulses to be counted. Therefore, the combination of the Scaler and incoming frequency determines the rate at which the frequency is updated in the Stored Value tag.

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30 Frequency Modes

EXAMPLE

Where Frequency Values are Stored in Tags

Mode Description Present Value Tag Stored Value Tag Totalizer Tag

Frequency No. of input pulses occurring

Period Rate Frequency Continuous Rate Frequency

The difference between the Period Rate and Continuous Rate modes is the outputs are dynamic (On/Off) throughout the sample period for Continuous Rate while Period Rate outputs are updated only at the end of the sample period. Your desired output behavior should determine whether one uses Period Rate or Continuous Rate modes.

page 35

See

in Sample Period

No. of 4 MHz pulses occurring in Sample Period

for details.

Frequency Accumulated pulse count

Frequency Mode

In Frequency mode, the module counts incoming pulses on channel A for a user-specified time interval that is configured in the Scaler tag. At the end of the interval, the module returns a value representing the sampled number of pulses in the Present Value tag, a value indicating the incoming frequency in the Stored Value tag and a value indicating the total number of pulses that have occurred in the Totalizer tag.

When the count and frequency are updated at the end of the sample period, any associated outputs are checked against their associated presets. The output On/Off values are related to the value in the Stored Value tag.

As you increase the Scaler (see

Sample Period for Frequency Mode

), the accuracy of the frequency and the time between samples will increase. In general, if you are measuring a higher frequency, the Scaler can be small. If you are measuring a lower frequency, the Scaler likely will be larger.

Frequency = No. of pulses per sample period/Scaler Time. For example, if the frequency = 30 Hz, and the Scaler = 100 ms, then

the Present Value tag returned = 3, and the Stored Value tag = 30.

Preset and rollover tag settings are active in this Frequency mode. User-defined preset and rollover commands provide control of the starting and ending points of incoming pulses, thus affecting the values in the Totalizer tag.

page 22

See

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

in Chapter 2 for preset and rollover tag details.

Page 31

Frequency Modes 31

IMPORTANT

A Input

Encoder/Pulse Generator

1756-HSC Module

B (Not used)

Z (Not used)

Incoming Pulses on A Input

Internal Sample Period

(Scaler Value, Example: 100 ms)

No. of Pulses Occurring During Sample Time in Present Value Tag

Totalizer Tag and Frequency Calculated Outputs Updated Here

(Gate/Reset)

User Selectable Sample Period,

10 ms to 2 seconds

in 10 ms increments

41690

...9 10 11 12 ...

Frequency in Stored Value Tag

User Selectable Sample Period

Sampled Pulses

100 ms

30 Hz

Total Number of Pulses in Totalizer Tag

123

Updated on Falling Edge of Scaler

* See Note Below

* Always Inactive for 10 ms Regardless of Scaler

Scaler No.

in ms

Sample Period for Frequency Mode

As previously mentioned, the Sample Period is a user-defined time frame to count the number of incoming pulses for calculating frequency. This fixed, sample period of time can be set by varying the Scaler tag, which can range from 10…2000 in 10 ms increments. For example, a Scaler value of 100 = 100 ms. The default value is 1 second.

A Scaler tag value of 0 equals a 1 second time period.

In the following frequency illustration, three pulses have been accumulated during the user-selected time period. If you had selected 100 ms as the sample period, the frequency returned to the controller is Frequency = Counts/Sample period = 3 counts/100 ms = 30 Hz.

Frequency Mode

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32 Frequency Modes

IMPORTANT

Encoder/Pulse Generator

Z Input

A Input Not Used B Input Not Used

1756-HSC Module

From Internal 4 MHz Clock

Scaler Value = 1

100 ms

No. of Sampled Pulses

41684

1, 2, 3 ....................400,000

4 MHz Internal Clock

No. of 4 MHz Pulses in Present Value Tag

Frequency in Stored Value Tag

.5 x Scaler*

250 ns ** x No. of 4 MHz clock

250 ns x 400,000

5 Hz

* If the scaler is equal to 1, the Frequency is accurate only if the duty cycle is 50%.

** One 4 MHz pulse = 250 ns.

Incoming Pulse Train at Z-Input

...9 10 11

910. . .Totalizer Tag

Determined by Scaler No. of Z-Input Pulses

Period Rate and Continuous Rate Modes

These two Frequency-operational modes are identical in how they calculate frequency. They determine the frequency of input pulses by counting the number of internal 4 MHz clock pulses over a user-specified number of Z-input signal pulses defined by the Scaler.

Frequency = .5 x Scaler / 250 ns x 4 MHz pulses

At the end of the sample period, the module returns the frequency in the Stored Value tag, the number of internal 4 MHz pulses in the Present Value tag, and a value indicating the total number of Z-input pulses that have occurred in the Totalizer tag. The output On/Off values are related to the value in the Present Value tag.

Preset and rollover settings are not active in Period Rate/Continuous Rate modes and must be equal to zero.

The difference between these two modes is in the operation of the outputs. In Continuous Rate mode, outputs are dynamically checked against their configured presets. In Period Rate mode, outputs are checked only against

page 36

their configured presets at the end of the sample period. See

for details.

Period Rate / Continuous Rate Modes

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Page 33

Frequency Modes 33

1234 56Cycles

Input Pulses on Z-Input

Sample Period for Scaler of:

1 (*)

* - a 50% duty cycle is required for accurate Frequency calculations when using a scaler of 1.

4 MHz count value in Present Value tag is incremented.

44926

IMPORTANT

As the frequency of the incoming pulse train increases, the number of sampled pulses from the 4 MHz clock decreases. Because accuracy is related to the number of 4 MHz pulses received over the sample period, the accuracy will decrease with increasing input frequencies at the Z-input. The decrease in accuracy can be lessened by scaling the input frequency through the use of the Scaler tag.

The Scaler configuration allows the incoming pulse train at the Z-input to be divided by a user-defined number. The internal 4 MHz pulses are counted for the duration of an input pulse, or multiple pulses if the Scaler is > 1. Measuring multiple input periods increases the accuracy of your measurement.

Acceptable numbers for the scaler are 1, 2, 4, 8, 16, 32, 64, and 128. There is one Scaler value for each counter. The default value for each Scaler is 1; a 0 is equivalent to 1.

Sample Period for Period/Continuous Rate Modes

In Period and Continuous Rate modes, the Scaler value defines the number of half-cycles of the incoming pulse train that comprises the sample period. The 4 MHz count value in the Present Value tag is incremented within the pulse train set by the Scaler tag.

The length of the sample period in time will vary with the incoming frequency. The lower the incoming frequency, the longer the time.

Sample period times scaler must be less than 0.25 seconds or the counter will overflow without providing an overflow indication.

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34 Frequency Modes

The inverse relationship of the increase in frequency and decrease in sampled pulses is shown in the table.

Inverse Relationship of Frequency and Sampled Pulses

Input Frequency at Z-Input

2 Hz

5 Hz

10 Hz

20 Hz

Scaler Value No. of 4 MHz Pulses

in Present Value Tag

1 1,000,000 2 2,000,000 4 4,000,000

1 400,000 2 800,000 4 1,600,000

1 200,000 2 400,000 4 800,000

1 100,000 2 200,000 4 400,000

50 Hz

100 Hz

200 Hz

500 Hz

1 40,000 2 80,000 4 160,000

1 20,000 2 40,000 4 80,000

1 10,000 2 20,000 4 40,000

1 4,000 2 8,000 4 16,000

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Frequency Modes 35

Output Operation

The Period Rate and Continuous Rate frequency operational modes differ in the operation of their respective on-board outputs. Both modes use count values that you enter in the ‘Output Turns On’ and ‘Output Turns Off’ fields on the Output Configuration tab. These user-defined presets turn an output On and Off. These On and Off count values are compared to the internal 4 MHz counts returned in the Present Value tag.

The Period Rate output On/Off presets are checked only once per sample period. Therefore, outputs are only checked against their On/Off values and updated once per scaler number of incoming pulses.

The Continuous Rate output On/Off presets are checked continuously during the sample period. Therefore, outputs are dynamically checked against their On/Off values and can be updated multiple times per scaler number of incoming pulses.

For example, assume that the module was programmed to turn On an output with a count value = 20,000 and Off at a count value = 80,001. Also assume that the incoming frequency resulted in the 4 MHz clock count in the Present Value tag = 40,000 with a scaler of ‘1’.

In Period Rate mode, the output would always be On because at the end of every sample period the Stored Value, Present Value, and Totalizer tags would be updated and the outputs compared against their On/Off values. The number of 4 MHz counts in the Present Value tag would be 40,000, which is between 20,000 and 80,001, therefore, the output would be On.

In Continuous Rate mode, the output state would change from Off to On to Off during the incoming external pulse. In this mode, the output presets are checked continuously against the 4 MHz count on the module. Initially, the 4 MHz count is zero and begins incrementing on the leading edge of the incoming pulse. The count continues to increment, whereupon it reaches 20,000 counts and the output turns On. The internal 4 MHz count continues incrementing until 40,000 counts, whereupon the pulse goes low and resets the 4 MHz count to zero, and the cycle repeats.

In both Period Rate and Continuous Rate, the Present Value, Stored Value, and Totalizer tags are updated at the end of the sample period.

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See modes.

for square wave examples in Period Rate and Continuous Rate

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36 Frequency Modes

Outputs in Period Rate and Continuous Rate with Scaler = 1

50 Hz at Z-Input 50% Duty Cycle Scaler Tag= 1

Counter

Idle

Counter Times Width of Pulse 4 MHz Count in Present Value Tag = 40,000

Output State in Period Rate

4 MHz Count = 40,000

Scaler Tag = 1 Output OnValue Tag = 20,000 Output OffValue Tag = 80,001

Output State in Continuous Rate

Scaler Tag = 1 Output OnValue = 20,000 Output OffValue = 80,001

4 MHz Count

= 20,000

4 MHz Count

= 40,000

Outputs in Period Rate and Continuous Rate with Scaler = 2

50 Hz at Z-Input 50% Duty Cycle

Scaler Tag = 2

What the Counter Sees Internally With Scaler Tag = 2

Counter Idle

Counter Times Width of Pulse 4 MHz = 80,000

Output State in Period Rate

4 MHz Count = 80,000

Output State in Continuous Rate

4 MHz Count

= 20,000

4 MHz Count

= 80,000

12633-I

Scaler Tag = 2 Output OnValue Tag = 20,000 Output OffValue Tag = 80,001

Scaler Tag = 2 Output OnValue = 20,000 Output OffValue = 80,001

Period Rate /Continuous Rate Output Examples

The following square waves illustrate the difference between Period Rate and Continuous Rate frequency operational modes. All square waves were initiated by applying a 50 Hz signal at the Input Z terminal of a counter configured for either Period Rate or Continuous Rate. The output configuration remained constant with an On value of 20,000 counts and an Off value of 80,001 counts. Only the Scaler mode was varied to show the operation of the two modes.

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Frequency Modes 37

Outputs in Period Rate and Continuous Rate with Scaler = 4

50 Hz at Z-Input 50% Duty Cycle Scaler Tag = 4

What the Counter Sees Internally With Scaler Tag = 4

Counter Idle

Counter Times Width of Pulse 4 MHz = 160,000

Output State in Period Rate

4 MHz Count = 160,000 4 MHz Count = 160,000

Output State in Continuous Rate

4 MHz Count

= 20,000

4 MHz Count

= 80,000

4 MHz Count

= 20,000

4 MHz Count

= 80,000

4 MHz Count

= 20,000

12634-I

Scaler Tag = 4 Output OnValue Tag = 20,000 Output OffValue Tag = 80,001

Scaler Tag = 4 Output OnValue = 20,000 Output OffValue = 80,001

IMPORTANT

Maximum Frequency

A module is capable of counting up to 16 million counts. However, the maximum rate at which the counter can accept counts depends on the type of signal directly connected to the module.

The table lists the acceptable signal levels for the 1756-HSC module..

Signal Type Source Device Maximum Signal

Pulse Digital Rulers

Quadrature Quadrature Encoder 250 kHz Channels A and B Frequency

(Frequency, Period Rate, Continuous Rate)

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PHOTOSWITCH

Flowmeters 500 kHz with a pulse

Higher signal rates typically require extra caution in the installation and compatibility of the pulse generating device. Be sure to read your device’s compatibility.

Appendix D,

HSC Channels

Rate

1 MHz with a pulse

Supporting Signal

Channel A

width >500 ns

Channel A or Z Input

width > 1s

‘Application Considerations’, to verify

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38 Frequency Modes

Notes:

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Page 39

Install and Wire the ControlLogix

ATTENTION

High-speed Counter Module

Chapter

Introduction

This chapter describes how to install and maintain the 1756-HSC module. If

page 55

your module is already installed, proceed to

Topic Page

Install the 1756-HSC Module 41 Key the Removable Terminal Block 42 Connect the Wires 44 Wire Terminations 47 Assemble the Removable Terminal Block and Housing 50 Install the Removable Terminal Block 51 Remove the Removable Terminal Block 52 Remove the Module from the Chassis 53

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR 11. Without appropriate precautions, there may be difficulties with electromagnetic compatibility in residential and other environments due to conducted and radiated disturbances.

This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The enclosure must have suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame spread rating of 5VA, V2, V1, V0 (or equivalent) if nonmetallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

In addition to this publication, see the following:

•Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1 requirements

•NEMA Standard 250 and IEC 60529, as applicable, for explanations of the degrees of protection provided by enclosures

39Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

, for additional installation

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40 Install and Wire the ControlLogix High-speed Counter Module

WARNING

ATTENTION

North American Hazardous Location Approval

The following information applies when operating this equipment in hazardous locations.

Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for use in Class I Division 2 Groups A, B, C, D, Hazardous Locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the most adverse temperature code (lowest "T" number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Authority Having Jurisdiction at the time of installation.

EXPLOSION HAZARD -

• Do not disconnect equipment unless power has been removed or the area is known to be nonhazardous.

• Do not disconnect connections to this equipment unless power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

• Substitution of components may impair suitability for Class I, Division 2.

• If this product contains batteries, they must only be changed in an area known to be nonhazardous.

Informations sur l’utilisation de cet equipement en environnements dangereux.

Les produits marques "CL I, DIV 2, GP A, B, C, D" ne conviennent qu'a une utilisation en environnements de Classe I Division 2 Groupes A, B, C, D dangereux et non dangereux. Chaque produit est livre avec des marquages sur sa plaque d'identification qui indiquent le code de temperature pour les environnements dangereux. Lorsque plusieurs produits sont combines dans un systeme, le code de temperature le plus defavorable (code de temperature le plus faible) peut etre utilise pour determiner le code de temperature global du systeme. Les combinaisons d'equipements dans le systeme sont sujettes a inspection par les autorites locales qualifiees au moment de l'installation.

RISQUE D’EXPLOSION –

• Couper le courant ou s'assurer que l'environnement est classe non dangereux avant de debrancher l'equipement.

• Couper le courant ou s'assurer que l'environnement est classe non dangereux avant de debrancher les connecteurs. Fixer tous les connecteurs externes relies a cet equipement a l'aide de vis, loquets coulissants, connecteurs filetes ou autres moyens fournis avec ce produit.

• La substitution de composants peut rendre cet

equipement inadapte a une utilisation en environnement de Classe I, Division 2.

• S'assurer que l'environnement est classe non dangereux avant de changer les piles.

Prevent Electrostatic Discharge This equipment is sensitive to electrostatic discharge, which

can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

•Touch a grounded object to discharge potential static.

•Wear an approved grounding wriststrap.

•Do not touch connectors or pins on component boards.

•Do not touch circuit components inside the equipment.

•Use a static-safe workstation, if available.

•Store the equipment in appropriate static-safe packaging

when not in use.

The ControlLogix system has been agency certified using only the ControlLogix RTBs (1756-TBCH and 1756-TBS6H). Any application that requires agency certification of the ControlLogix system using other wiring termination methods may require application specific approval by the certifying agency.

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Install and Wire the ControlLogix High-speed Counter Module 41

WARNING

Top Guide

Bottom Guide

20861-M

Install the 1756-HSC Module

You can install or remove the module while chassis power is applied.

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding. Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance that can affect module operation.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

1. Align the circuit board with the top and bottom chassis guides, as shown.

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42 Install and Wire the ControlLogix High-speed Counter Module

Locking Tab

20862-M

2. Slide the module into the chassis until the module’s top and bottom

locking tabs ‘click’.

Key the Removable Terminal Block

You should key the RTB to prevent inadvertently connecting the incorrect RTB to your module.

When the RTB mounts onto the module, keying positions will match up. For example, if you place a U-shaped keying band in slot 4 on the module, you cannot place a wedge-shaped tab in slot 4 on the RTB or your RTB will not mount on the module.

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Install and Wire the ControlLogix High-speed Counter Module 43

IMPORTANT

20850-M

Module Side of RTB

20851-M

1. Insert the U-shaped band with the longer side near the terminals, pushing the band on the module until it snaps into place.

2. Key the RTB in positions that correspond to unkeyed module positions.

3. Insert the wedge-shaped tab on the RTB with the rounded edge first.

4. Push the tab onto the RTB until it stops.

When keying your RTB and module, you must begin with a wedge-shaped tab in slot 6 or 7.

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44 Install and Wire the ControlLogix High-speed Counter Module

WARNING

ATTENTION

IMPORTANT

20104-M

Wiring the Module

Before wiring the module, adhere to the following wiring guidelines.

If you connect or disconnect wiring while the field-side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

If multiple power sources are used, do not exceed the specified isolation voltage.

When using the 1756-TBCH, do not wire more than two

0.33...1.3 mm² (22...16 AWG) conductors on any single terminal. Use only the same size wires with no intermixing of solid and stranded wire types.

Connect the Wires

When using the 1756-TBS6H, do not wire more than 1 conductor on any single terminal.

You can use an RTB to connect wiring to your module. For most applications, we recommend using Belden 8761 cable. The RTB terminations can accommodate 0.33...1.3 mm² (22...16 AWG) shielded wire. Before wiring the RTB, you must connect ground wiring.

Follow these directions to ground the wiring to the RTB.

We recommend you ground the drain wire at the field-side. If you cannot ground at the field-side, ground at an earth-ground on the chassis as shown below.

1. Remove a length of cable jacket from the connecting cables.

2. Pull the foil shield and bare the drain wire from the insulated wire.

3. Twist the foil shield and the drain wire together to form a single strand.

4. Attach a ground lug and apply heat shrink tubing to the exit area.

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Install and Wire the ControlLogix High-speed Counter Module 45

Chassis Mounting Tab

4 m or 5 m (#10 or #12) Star Washer

Drain Wire with Ground Lug

4 m or 5 m (#10 or #12) Phillips Screw and Star Washer (or SEM Screw)

20918-M

Functional Earth Ground Symbol

5. Connect the drain wire to a chassis mounting tab.

Use any chassis mounting tab that is designated as a functional signal ground. The functional earth ground symbol appears near the tab.

6. When the drain wire is grounded, connect the insulated wires to the field-side.

Connect Ungrounded End of the Cable

Follow these directions to connect the ungrounded end of the cable.

1. Cut the foil shield and drain wire back to the cable casing and apply shrink wrap.

2. Connect the insulated wires to the RTB.

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46 Install and Wire the ControlLogix High-speed Counter Module

ATTENTION

20859-M

20860-M

Two Types of RTBs (each RTB comes with housing)

Cage clamp - catalog number 1756-TBCH

1. Insert the wire into the terminal.

2. Turn the screw clockwise to close the terminal on the wire.

Spring clamp - catalog number 1756-TBS6H

1. Insert the screwdriver into the outer hole of the RTB.

2. Insert the wire into the open terminal and remove the screwdriver.

The ControlLogix system has been agency certified using only the ControlLogix RTBs (catalog numbers 1756-TBCH, 1756-TBNH, 1756-TBSH and 1756-TBS6H). Any application that requires agency certification of the ControlLogix system using other wiring termination methods may require application specific approval by the certifying agency.

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Install and Wire the ControlLogix High-speed Counter Module 47

Z1 (12…24V) Z1 (5V)

Z1 (RET) B1 (12…24V) B1 (5V)

B1 (RET) A1 (12…24V) A1 (5V)

A1 (RET) Not Used Not Used

Not Used

Z0 (12…24V) Z0 (5V)

Z0 (RET) B0 (12…24V) B0 (5V)

B0 (RET) A0 (12…24V) A0 (5V)

A0 (RET) Not Used Not Used

Not Used

COMMON 0 COMMON 0 COMMON 0

DC-0(+)

Out 2 Out 3

COMMON 1 COMMON 1 COMMON 1 DC-1(+)

Out 0 Out 1

Black

White Black

Blue

Green

Differential Line Driver Output

41601

Allen-Bradley Bulletin 845 Incremental Encoder

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

1 3 5 7

9 11 13 15 17 19 21 23 25 27 29 31 33 35

Recommendations for Wiring Your RTB

We recommend that you follow these guidelines when wiring your RTB.

1. Begin wiring the RTB at the bottom terminals and move up.

2. Use a tie to secure the wires in the strain relief (bottom) area of the RTB.

3. Order and use an extended-depth housing (catalog number 1756-TBE)

for applications that require heavy gauge wiring.

Wire Terminations

Appendix D

See

for cable considerations.

The following sections provide details about wiring terminations to specific products.

Wire an Allen-Bradley 845 Incremental Encoder

Use the table and diagram to connect the 1756-HSC module to an Allen-Bradley 845 incremental encoder.

Application A1 Connections B1 Connections Z1 Connections

Differential Line Driver Output (40 mA)

White - A1 5V DC Black of white A1Return

Blue - B1 5V DC Black of blue - B1 Return

Green - Z1 5V DC Black of green - Z1 Return

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48 Install and Wire the ControlLogix High-speed Counter Module

Jumpers

Black

Blue

Z1 (12…24V) Z1 (5V)

Z1 (RET) B1 (12…24V) B1 (5V)

B1 (RET) A1 (12…24V) A1 (5V)

A1 (RET) Not Used Not Used

Not Used

Z0 (12…24V) Z0 (5V)

Z0 (RET) B0 (12…24V) B0 (5V)

B0 (RET) A0 (12…24V) A0 (5V)

A0 (RET) Not Used Not Used

Not Used

COMMON 0 COMMON 0 COMMON 0

DC-0(+)

Out 2 Out 3

COMMON 1 COMMON 1 COMMON 1 DC-1(+)

Out 0 Out 1

12…24V DC

12…24V DC Return

41602

Allen-Bradley Bulletin 872 3-Wire DC Proximity Sensor

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

1 3 5 7

9 11 13 15 17 19 21 23 25 27 29 31 33 35

Wire an Allen-Bradley Bulletin 872 3-Wire DC Proximity Sensor

Use the table and diagram to connect the 1756-HSC module to an Allen-Bradley 872 three-wire DC proximity sensor.

Application A0 Connections B0 Connections Z0 Connections

PNP (Sourcing) N.O.

Black - A0 12…24V DC Blue, PS(-)-A0 Return

Jumper B0 12…24V DC to B0 Return

Jumper Z0 12…24V DC to Z0 Return

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Install and Wire the ControlLogix High-speed Counter Module 49

Jumper

Black

Blue

White

Not used

10…30V DC

Z1 (12…24V) Z1 (5V)

Z1 (RET) B1 (12…24V) B1 (5V)

B1 (RET) A1 (12…24V) A1 (5V)

A1 (RET) Not used Not used

Not used

Z0 (12…24V) Z0 (5V)

Z0 (RET) B0 (12…24V) B0 (5V)

B0 (RET) A0 (12…24V) A0 (5V)

A0 (RET) Not used Not used

Not used

COMMON 0 COMMON 0 COMMON 0

DC-0(+)

Out 2 Out 3

COMMON 1 COMMON 1 COMMON 1 DC-1(+)

Out 0 Out 1

12…24V DC Return

41603

PHOTOSWITCH Series 10,000 Photoelectric Sensor

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

1 3 5 7

9 11 13 15 17 19 21 23 25 27 29 31 33 35

Wire a PHOTOSWITCH Series 10,000 Photoelectric Sensor

Use the table and diagram to connect wiring to a series 10,000 photoelectric sensor.

Application A1 Connections B1 Connections Z1 Connections

Any Black - A1 12…24V DC

Blue - A1 Return

Jumper B1 12…24V DC to B1 Return

White - Z1 12…24V DC Blue - Z1 Return

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50 Install and Wire the ControlLogix High-speed Counter Module

20858-M

IMPORTANT

Assemble the Removable Terminal Block and Housing

Removable housing covers the wired RTB to protect wiring connections when the RTB is seated on the module. Parts of the 1756-TBCH RTB (example below) are identified in the table.

Item Description

1 Housing cover 2 Groove 3 Side edge of RTB 4RTB 5 Strain relief area

Follow these steps to attach the RTB to the housing.

1. Align the grooves at the bottom of each side of the housing with the side edges of the RTB.

2. Slide the RTB into the housing until it snaps into place.

If additional wire routing space is required for your application, use the extended-depth housing, catalog number 1756-TBE.

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Install and Wire the ControlLogix High-speed Counter Module 51

WARNING

Top Guide

Bottom Guide

20853-M

Install the Removable Terminal Block

These steps show how to install the RTB onto the module to connect the wiring.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

Before installing the RTB, make certain:

• field-side wiring of the RTB has been completed.

• the RTB housing is snapped into place on the RTB.

• the RTB housing door is closed.

• the locking tab at the top of the module is unlocked.

1. Align the top, bottom, and left side guides of the RTB with the guides on the module.

2. Press quickly and evenly to seat the RTB on the module until the latches snap into place.

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52 Install and Wire the ControlLogix High-speed Counter Module

20854-M

WARNING

3. Slide the locking tab down to lock the RTB onto the module.

Remove the Removable Terminal Block

If you need to remove the module from the chassis, you must first remove the RTB from the module. Do these steps to remove the RTB.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

1. Unlock the locking tab at the top of the module.

2. Open the RTB door by using the bottom tab.

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Install and Wire the ControlLogix High-speed Counter Module 53

IMPORTANT

20855-M

WARNING

3. Hold the spot marked PULL HERE and pull the RTB off the module.

Do not wrap your fingers around the entire door. A shock hazard exists.

Remove the Module from the Chassis

Follow these steps to remove a module from its chassis.

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.

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54 Install and Wire the ControlLogix High-speed Counter Module

20856-M

20857-M

1. Push in the top and bottom locking tabs.

2. Pull the module out of the chassis.

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Configure the 1756-HSC Module

IMPORTANT

Chapter

Introduction

This chapter describes how to configure the 1756-HSC/B module, firmware revision 3.x, by using RSLogix 5000 programming software, version 18 and later. Your 1756-HSC module will not work until it has been configured.

See

Appendix C

firmware revisions 1.x and 2.x and RSLogix 5000 software versions 15…18.

Topic Page

ControlLogix Overview 55 Configure a 1756-HSC/B, Module by using RSLogix 5000 Software,

Version 18 and Later

for profiles of the 1756-HSC/A. The instructions include

RSLogix 5000 programming software must be installed on your computer to complete the procedures for both default and custom configurations.

For software installation instructions and to learn how to navigate the software package, see the RSLogix 5000 Getting Results Guide, publication

9399-RLD300GR

ControlLogix Overview

Set Up Counter Configuration 65 Set Up Output Configuration 68 Copy Configuration (.C) Output, Rollover, Preset Tags to Output (.O) Tags 71 Electronic Keying 73 Download Configuration to the 1756-HSC Module 79

Before configuring your 1756-HSC module in a local or remote chassis, you must have an understanding of how the module operates with the controller in the ControlLogix system. Every 1756-HSC module must be owned by a Logix5000 controller. This owner-controller stores configuration data for every 1756-HSC module that it owns.

The owner-controller sends configuration information to the modules it owns anytime the module has not been configured; generally this occurs on a module powerup or a controller-initiated reconfigure. Adding the 1756-HSC module to the I/O configuration tree of the RSLogix 5000 programming software creates configuration and I/O data structures and tags for the 1756-HSC module.

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56 Configure the 1756-HSC Module

44779

Logix Controller 1756-HSC Module

Ta gs

User Program

A remote chassis, also known as a networked chassis, contains the 1756-HSC module but not the module’s owner-controller. See

page 57

for important information about running RSNetWorx™ software with a remote chassis.

The illustration shows how the module communicates with its owner-controller. If connections are severed or compromised, the 1756-HSC module performs as configured, either setting all outputs to reset (On or Off) or continuous operations.

Module Communication with its Owner-controller

Path No. Description

1 Controller transfers configuration data and commands to the module. 2 External devices generate input signals that are transmitted to the

3 Module converts signals, stores values, and controls output without being

4 Controller stores the counts or frequency values in descriptive and easily

5 Ladder logic program can store and move data before the inputs trigger

A module’s communication, or multicasting, behavior varies depending upon whether it operates in the local chassis or in a remote chassis. The following sections detail the differences in data transfers between these setups.

Direct Connections

A direct connection is a real-time data transfer link between the controller and the device that occupies the slot that the configuration data references. When module configuration data is downloaded to an owner-controller, the

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011

controller attempts to establish a direct connection to each of the modules referenced by the data.

module.

updated by the controller.

understood tags.

new data.

Page 57

Configure the 1756-HSC Module 57

IMPORTANT

One of the following events occurs:

• If the data is appropriate to the module found in the slot, a connection is made and operation begins.

• If the configuration data is not appropriate, the data is rejected and an error message displays in the software. In this case, the configuration data can be inappropriate for any of a number of reasons. For example, a module’s configuration data may be appropriate except for a mismatch in electronic keying that prevents normal operation.

The controller maintains and monitors its connection with a module. Any break in the connection, such as removal of the module from the chassis while under power, causes the controller to set faults in the data area associated with the module. The RSLogix 5000 programming software may monitor this data area to announce the module’s failures.

Local Chassis Operation

The time frame that a module produces its data depends on the options chosen during configuration and where in the control system the module physically resides, such as locally or remotely. The requested packet interval (RPI) instructs the module to send its channel and status data to the local chassis backplane at specific time intervals.

The RPI value is set during the initial module configuration by using the RSLogix 5000 programming software. This value can be adjusted when the controller is in Program mode.

See

page 64

for RPI settings.

Remote Chassis Operation

If a module resides in a networked chassis, the role of the RPI changes slightly with respect to getting data to the owner. The RPI not only defines when the module produces data within its own chassis, but also determines how often the owner-controller receives it over the network.

When an RPI value is specified for a module in a remote chassis, in addition to instructing the module to produce data within its own chassis, the RPI also ‘reserves’ a spot in the stream of data flowing across the network.

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58 Configure the 1756-HSC Module

ControlNet Network

Data sent at the RPI rates

HSC module

Local Chassis Remote Chassis

40947

The timing of this ‘reserved’ spot may not coincide with the exact value of the RPI, but the control system guarantees that the owner-controller receives data at least as often as the specified RPI. As shown in the illustration, data from the remote chassis is sent to the ControlNet bridge module at a rate no slower than the configured RPI.

Data from Remote Chassis Sent to ControlNet Bridge Module

You must run RSNetWorx software to enable 1756-HSC modules in a remote ControlNet (networked) chassis. Running RSNetWorx software transfers configuration data to networked modules and establishes a network update time (NUT) for the ControlNet network that is compliant with the desired communication options specified for each module during configuration.

If you are not using 1756-HSC modules in a networked ControlNet chassis, running RSNetWorx software is not necessary. However, anytime a controller references a 1756-HSC module in a networked chassis, RSNetWorx software must be run to configure the ControlNet network.

In an Ethernet network with a multicast connection, a module sends new data when prior data has not been transferred for one-quarter of the RPI. For example, if data is being sent every 10 ms and the RPI is set at 100 ms, the data transfer rate is every 30 ms.

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Configure the 1756-HSC Module 59

IMPORTANT

Use the Default Configuration

1756-HSC modules in the same chassis as the controller are ready to run as soon as the program download is complete. The default configuration for your module is the Counter operational mode, with none of the outputs tied to counters.

If you choose to write a specific configuration for your application, you must access the module tags and change configuration information before downloading configuration to the owner-controller and module. Otherwise, you must issue a reconfigure command from the controller.

Access the 1756-HSC data structures through the tag monitor to make specific configuration changes.

Configure a 1756-HSC/B, Module by using RSLogix 5000 Software, Version 18 and Later

Appendix B

See

After reviewing capabilities of your 1756-HSC/B module, you are ready to configure the module by using RSLogix 5000 programming software, version 18 and later. This section provides instructions and screen facsimiles for creating a 1756-HSC/B module.

The following steps assume that you have started the RSLogix 5000 programming software and have created a controller.

1. On the Controller Organizer, right-click I/O Configuration and choose New Module.

for tag descriptions.

Chapter 2

and

Chapter 3

RSLogix 5000 software, version 15 and later, lets you add I/O modules online. When using any previous version, you must be offline when you create a new module.

for a better understanding of the

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60 Configure the 1756-HSC Module

The Select Module dialog box appears.

2. Click the ‘+’ next to Speciality for a list for this module group.

3. Select 1756-HSC/B and click OK.

The New Module dialog box appears.

4. In the Name box, type a module name.

5. In the Slot box, enter the module’s slot number.

6. In the Description box, type an optional description for the module.

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Configure the 1756-HSC Module 61

IMPORTANT

7. From the Comm Format pull-down menu, choose a communication format.

page 62

See

for a description of the formats and the associated tags that

are created during the download.

Make sure you select the correct communication format for your application because you cannot change the selection after the program is downloaded with the controller. You will have to reconfigure the module to change the communication format.

8. In the Revision box, make sure to match the actual revision for your module.

This setting works in conjunction with the electronic keying to determine the connection.

9. Choose an electronic keying method.

page 73

See

for details.

Controllers that have RSLogix 5000 software, version 17 or earlier, should use Compatible Keying for the 1756-HSC/B module. You must upgrade to version 18 or later if Exact Match is required; otherwise, there will be no connection with the controller.

10. Do one of the following to either accept default configuration settings or edit configuration data.

a. To accept the default configuration settings, make sure

Open Module Properties is not checked and then click OK.

b. To set up a custom configuration, make sure Open Module

Properties is checked and then click OK.

The New Module Properties dialog box appears with tabs for entry

of additional configuration settings.

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62 Configure the 1756-HSC Module

IMPORTANT

Communication Format Options

Multiple controllers can receive data being produced by a 1756-HSC module. The communication format determines:

• whether a controller owns or just listens to the information.

• the type of configuration options that are available.

• the tags that are generated during the initial configuration.

The following table describes the four communication formats available for the 1756-HSC/B module.

Communication Format Description

HSC Data Format used by an owner-controller to

invoke the original functionality for the 1756-HSC module. ‘Data’ format generates tag structures identical to those used by older revision 1.x HSC modules. This format is compatible with revision 3.x HSC firmware but will limit the 1756-HSC module to revision 1.x functionality.

HSC Data-extended Format used by an owner-controller to

invoke the 1756-HSC module for data enhancements in HSC revision 3.x. ‘Data-extended’ format functionality includes Period Rate and Continuous Rate Frequency modes and dynamic control of Preset, Rollover, and Output On/Off values.

Listen-only HSC Data Format used by a controller to listen-only to

a 1756-HSC module that is using the HSC Data Comm Format that is configured by another controller.

Listen-only Extended Format used by a controller to listen-only to

a 1756-HSC module that is using the HSC Data-extended Comm Format that is configured by another controller.

See

page 63

for specific modes and tags for the HSC Data and

HSC Data-extended Comm Formats.

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Page 63

Communication Format Modes and Tags

Configure the 1756-HSC Module 63

The table lists the mode number and assigned tags for the HSC Data and HSC Data-extended Comm Formats. The HSC Data format does not create the Totalizer tag, so directional frequency with the counters is not available.

Comm Format = HSC Data

Set RPI

The Connection tab on the Module Properties dialog box lets you enter a requested packet interval (RPI). The RPI guarantees the slowest rate at which the pulse count values will be produced to the owner-controller.

The module’s actual data transfer rate may be faster than the RPI setting. But, the RPI provides a defined, maximum period of time when data is transferred to the owner-controller.

1. Choose from the options in the Connection tab.

Field Description

Requested Packet Interval (RPI) Enter an RPI value or use the default. Inhibit Module Check the box to prevent

communication between the owner-controller and the 1756-HSC module. This option allows for maintenance of the 1756-HSC module without faults being reported to the controller.

Major Fault On Controller If Connection Fails While in Run Mode

Check the box to create a major fault if there is a connection failure with the 1756-HSC module while in Run mode.

For important information on this checkbox, see ‘Configure a Major Fault to Occur’ in the Logix5000 Controllers Information and Status Programming Manual, publication

1756-PM015

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TIP

Field Description

Use Unicast Connection on EtherNet/IP Displays only for 1756-HSC modules

using RSLogix 5000 software version 18 in a remote EtherNet/IP chassis. Use the default checkbox if there are no other controllers in ‘Listen’ mode.

Clear the box if there are other ‘listening’ controllers in the system.

Module Fault The fault box is empty if you are offline.

The type of fault displays in the text box if a fault occurs when the 1756-HSC module is online.

2. Click OK.

Set Up Counter Configuration

The Counter Configuration tab (on the Module Properties dialog box) is identical for both the HSC-Data and HSC Data-extended Comm Formats. However, the HSC Data-extended format includes the addition of the Period Rate and Continuous Rate frequency selections in the Operational Mode pull-down menu.

Be sure to select only features that are compatible with your selected

page 66

communication format. See

for Counter Configuration tab

descriptions.

The Operational modes determine how the incoming pulses are counted. The Storage modes allow the count values to be manipulated if the application requires storage of the accumulated count value.

The different operational modes are detailed on

page 17

Chapter 2.

Follow these steps to choose Counter and Storage mode options.

1. On the Modules Properties dialog box, click the Counter Configuration tab.

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66 Configure the 1756-HSC Module

The Counter Configuration dialog box appears.

The dialog box is divided into two halves; one each for the respective channel (0, 1) inputs.

2. Choose counter parameters in the Counter Configuration tab.

Field descriptions and procedures apply for both channel 0 and channel 1.

Field Description

Operational Mode Choose an operational mode based on

your application requirements. These are the values:

• Counter Mode (default)

• Encoder x1 Mode

• Encoder x4 Mode

• Counter Not Used

• Frequency Mode

• Period Rate (valid with

HSC Data-extended format only)

• Continuous Rate (valid with HSC Data-extended format only)

See

Chapter 2

and illustrations on Counter and Frequency mode operations.

and

Chapter 3

for details

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Field Description

Storage Mode Choose how the pulse count will be

stored (with the mode selected in the above field) if required for an accumulated count. These are the values:

• No Store Mode (default)

• Store and Continue Mode

• Store, Wait, and Resume Mode

• Store and Reset, Wait, and Start

Mode

• Store and Reset, and Start Mode See

Storage Modes in Chapter 2

for

details.

Rollover Defaults to zero (0), which is the

equivalent to a full count range (16,777,214). When the accumulated count value in the Present Value tag reaches the rollover value, it resets to zero (0) and begins counting again.

Range is 0…16,777,214.

This configuration setting can be overridden by a value in the Output tag for the HSC Data-extended format only. See

Rollover in Chapter 2

for details.

Preset Box defaults to zero (0) if a Preset

command is issued. The 1756-HSC module’s Present Value tag will be set to the present value.

Range is 0…Rollover value.

This configuration setting can be overridden by a value in the Output tag for the HSC Data-extended format only. See

Preset in Chapter 2

for details.

Scaler Defaults to zero (0).

For Frequency mode, the Scaler determines the amount of time in milliseconds the 1756-HSC module counts incoming pulses. Range 0…2000 ms in 10 ms increments. A value of zero (0) is equivalent to 1000 ms.

For Period Rate/Continuous Rate modes, pulses will be used to count internal 4 MHz pulses. Allowable values are 0, 1, 2, 4, 8, 16, 32, 64, 128, 256.

A value of zero is equivalent to 1. Valid with the HSC Data-extended Comm Format only.

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68 Configure the 1756-HSC Module

Field Description

Use Filter A Use Filter B Use Filter Z

Invert Z Value Box becomes active when a Storage

Select a filter for either Channel 0 and/or Channel 1.

See

Filter Selections

affect the signal rate.

mode is selected other than ‘No Store Mode.’ When active, Input Z reverses reading the rising or falling edge of the pulse depending on previous usage. If the pulse was read on the rising edge, the module inverts the signal and now reads the falling edge of the pulse.

for how the filters

3. Click OK.

Filter Selections

High-speed inputs can be sensitive to electromagnetic noise. You can manually set Channel 0 inputs and/or Channel 1 inputs to filter out noise or debounce. Debounce is created when a mechanical device changes state (On/Off).

All 1756-HSC module inputs have the following characteristics:

Set Up Output Configuration

• With the filter disabled (assuming a 50% duty cycle): – module reads at 1 MHz in Counter mode. – module reads at 250 kHz in Encoder x1 or Encoder x4 mode. – module reads at 500 kHz in Frequency mode.

• With the filter enabled (assuming a 50% duty cycle): – module counts all pulses at a frequency below 70 Hz. – module does not count any pulses at a frequency above 150 Hz. – frequencies between 71…148 Hz the operation is unpredictable and

varies with duty cycles.

The Output Configuration tab (on the Module Properties dialog box) is available for either the HSC Data or HSC Data-extended Comm Format with the 1756-HSC/B module. The tab lets you set up and maintain the four on-board outputs, which compare user-defined values to the Present Value tag to turn outputs On or Off.

Follow these steps to set up the output operation.

1. On the Modules Properties dialog box, click the Output Configuration tab.

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The Output Configuration dialog box appears.

2. Choose output parameters in the Output Configuration dialog box.

Field Description

Output Click one of four output buttons to

configure the respective output.

Tie to Counter Choose a mode to determine if an

output is tied to a counter. These are the values:

• Not Tied to Counter (default)

• Tied to Counter 0

• Tied to Counter 1

Output State in Fault Mode

Output State in Program Mode

Defaults to Off for both options. These settings determine how you want the behavior of the outputs if a fault occurs, such as a connection loss. These are the values:

• Outputs Turn On

• Counter Continues to Determine

Outputs Operation Important: For firmware revision 2 and later, a routine must be added in ladder logic to copy the configuration (C.) output setting to the (O.) output tags. Otherwise, the configuration setting will be overridden by the output tag for values other than Off.

See

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for ladder logic procedures.

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70 Configure the 1756-HSC Module

Field Description

First Value Output Turns ON Type values to turn the selected output First Value Output Turns OFF Second Value Output Turns ON

On and Off, respectively. Each pair (First Value, Second Value) can be assigned to an output.

Second Value Output Turns OFF

Communications Failure

When communications fail in Program Mode

3. Click OK.

The values can be set for the rising or falling edge of the window depending on whether the Invert Z Value is active for an operational mode. For example, a pulse count could turn On at 100 counts and end at 200 counts, or turn Off at 100 counts and turn back On at 200 counts.

Select the output’s status if communication is severed between the module and its owner-controller.

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IMPORTANT

Copy Configuration (.C) Output, Rollover, Preset Tags to Output (.O) Tags

The configuration procedures previously described populated the Configuration tags (.C) in the controller memory. Starting with firmware revision 2 for the 1756-HSC module, some of these tags—output, preset, and rollover, are also populated in the Output tags (.O) to facilitate real-time changes of these parameters.

However, the duplication of tag data could result in values being overridden when the HSC Data-extended Comm Format is selected.

The override occurs for Fault mode/Program mode output selections other than Off on the Output Configuration tab.

For example, if the outputs are configured to turn ON when in Program mode in the configuration structure and that data is not copied into the output tag structure and is left zero, the output will instead be Off during Program mode.

To coordinate the configuration tags with the output tags, we recommend that you create a ladder logic routine to copy the Configuration tag (.C) output, rollover, and preset definitions to the Output (.O) tags. This will help synchronize the data tags; when the configuration tags are established or modified, the same data will be used in the output tags.

Follow these steps to copy configuration definitions to output tags.

1. On the Controller Organizer, click the ‘+’ in front of Main Task.

A sub-menu appears.

2. Right-click MainRoutine and choose Open.

A new rung in ladder logic appears.

3. At the top of the ladder logic workspace, click the File/Misc. tab.

4. Drag-and-drop ‘File Synchronous Copy’ onto the first rung.

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5. Type the following information:

Source -- Local:3:C.Output[0] Dest -- Local:3:O.Output[0] Length -- 4 (this is the size of the array with 4 outputs: 0, 1, 2, 3)

Your routine should look like the following example for a 1756-HSC module in a slot.

6. Repeat

step 4

and

step 5

to add two more CPS commands to the

same rung.

7. Type the information as shown in the example.

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IMPORTANT

Electronic Keying

When you create a new module, you can choose how specific the keying must be when a module is inserted into the 1756-HSC module’s slot in the chassis.

Modules that are using Major Revision 3.x or later with RSLogix 5000 software versions 15...17 must use Compatible Keying. You must upgrade to version 18 if Exact Match is required.

The electronic keying feature automatically compares the expected module, as shown in the RSLogix 5000 I/O Configuration tree, to the physical module before I/O communication begins. You can use electronic keying to help prevent communication to a module that does not match the type and revision expected.

For each module in the I/O Configuration tree, the user-selected keying option determines if, and how, an electronic keying check is performed. Typically, three keying options are available.

•Exact Match

• Compatible Keying

• Disable Keying

You must carefully consider the benefits and implications of each keying option when selecting between them. For some specific module types, fewer options are available.

Electronic keying is based on a set of attributes unique to each product revision. When a Logix5000 controller begins communicating with a module, this set of keying attributes is considered.

Keying Attributes

Attribute Description

Vendor The manufacturer of the module, for example, Rockwell

Automation/Allen-Bradley.

Product Type The general type of the module, for example, communication

adapter, AC drive, or digital I/O.

Product Code The specific type of module, generally represented by its catalog

number, for example, 1756-HSC.

Major Revision A number that represents the functional capabilities and data

exchange formats of the module. Typically, although not always, a later, that is higher, Major Revision supports at least all of the data formats supported by an earlier, that is lower, Major Revision of the same catalog number and, possibly, additional ones.

Minor Revision A number that indicates the module’s specific firmware revision.

Minor Revisions typically do not impact data compatibility but may indicate performance or behavior improvement.

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IMPORTANT

You can find revision information on the General tab of a module’s Properties dialog box.

General Tab

Changing electronic keying selections online may cause the I/O communication connection to the module to be disrupted and may result in a loss of data.

Exact Match

Exact Match keying requires all keying attributes, that is, Vendor, Product Type, Product Code (catalog number), Major Revision, and Minor Revision, of the physical module and the module created in the software to match precisely in order to establish communication. If any attribute does not match precisely, I/O communication is not permitted with the module or with modules connected through it, as in the case of a communication module.

Use Exact Match keying when you need the system to verify that the module revisions are exactly as specified in the project, such as for use in highly-regulated industries.

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EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 1

Physical Module Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 2

Communication is prevented.

Exact Match keying is also necessary to enable Automatic Firmware Update for the module via the Firmware Supervisor feature from a Logix5000 controller.

In the following scenario, Exact Match keying prevents I/O communication:

The module configuration is for a 1756-IB16D module with module revision 3.1. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is prevented because the Minor Revision of the module does not match precisely

Changing electronic keying selections online may cause the I/O Communication connection to the module to be disrupted and may result in a loss of data.

Compatible Keying

Compatible Keying indicates that the module determines whether to accept or reject communication. Different module families, communication adapters, and module types implement the compatibility check differently based on the family capabilities and on prior knowledge of compatible products.

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EXAMPLE

Module Configuration Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 3

Physical Module Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 2

Communication is prevented.

Compatible Keying is the default setting. Compatible Keying allows the physical module to accept the key of the module configured in the software, provided that the configured module is one the physical module is capable of emulating. The exact level of emulation required is product and revision specific.

With Compatible Keying, you can replace a module of a certain Major Revision with one of the same catalog number and the same or later, that is higher, Major Revision. In some cases, the selection makes it possible to use a replacement that is a different catalog number than the original. For example, you can replace a 1756-CNBR module with a 1756-CN2R module.

Release notes for individual modules indicate the specific compatibility details.

When a module is created, the module developers consider the module’s development history to implement capabilities that emulate those of the previous module. However, the developers cannot know future developments. Because of this, when a system is configured, we recommend that you configure your module by using the earliest, that is, lowest, revision of the physical module that you believe will be used in the system. By doing this, you can avoid the case of a physical module rejecting the keying request because it is an earlier revision than the one configured in the software.

In the following scenario, Compatible Keying prevents I/O communication:

The module configuration is for a 1756-IB16D module with module revision 3.3. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is prevented because the minor revision of the module is lower than expected and may not be compatible with 3.3

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EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D

Major Revision = 2 Minor Revision = 1

Physical Module Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16D

Major Revision = 3 Minor Revision = 2

Communication is allowed.

In the following scenario, Compatible Keying allows I/O communication:

The module configuration is for a 1756-IB16D module with module revision 2.1. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is allowed because the major revision of the physical module is higher than expected and the module determines that it is compatible with the prior major

revision

Changing electronic keying selections online may cause the I/O communication connection to the module to be disrupted and may result in a loss of data.

Disabled Keying

Disabled Keying indicates the keying attributes are not considered when attempting to communicate with a module. Other attributes, such as data size and format, are considered and must be acceptable before I/O communication is established. With Disabled Keying, I/O communication may occur with a module other than the type specified in the I/O Configuration tree with unpredictable results. We generally do not recommend using Disabled Keying.

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78 Configure the 1756-HSC Module

ATTENTION

EXAMPLE

Module Configuration Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IA16 Major Revision = 3 Minor Revision = 1

Physical Module Vendor = Allen-Bradley

Product Type = Analog Input Module Catalog Number = 1756-IF16 Major Revision = 3 Minor Revision = 2

Communication is prevented.

Be extremely cautious when using Disabled Keying; if used incorrectly, this option can lead to personal injury or death, property damage, or economic loss.

If you use Disabled Keying, you must take full responsibility for understanding whether the module being used can fulfill the functional requirements of the application.

In the following scenario, Disable Keying prevents I/O communication:

The module configuration is for a 1756-IA16 digital input module. The

physical module is a 1756-IF16 analog input module. In this case,

communication is prevented because the analog module rejects the data formats that the digital module configuration requests.

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EXAMPLE

Module Configuration Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IA16 Major Revision = 2 Minor Revision = 1

Physical Module Vendor = Allen-Bradley

Product Type = Digital Input Module Catalog Number = 1756-IB16 Major Revision = 3 Minor Revision = 2

Communication is allowed.

In the following scenario, Disable Keying allows I/O communication:

The module configuration is for a 1756-IA16 digital input module. The physical module is a 1756-IB16 digital input module. In this case, communication is allowed because the two digital modules share common data formats

Download Configuration to the 1756-HSC Module

After you have changed the configuration data for a 1756-HSC module, the change does not take affect until you download the new program that contains that information. This downloads the entire program to the controller, overwriting any existing programs.

Follow these steps to download the new program.

1. At the top, left corner of the RSLogix 5000 software program, click the status icon.

2. Choose Download.

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The Download dialog box appears.

3. Click Download.

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Module Diagnostics

Chapter

Introduction

1756-HSC Error Codes

This chapter describes error codes and fault conditions to help you troubleshoot the 1756-HSC module.

Topic Page

1756-HSC Error Codes 81 RSLogix 5000 Diagnostics 82 Troubleshoot the 1756-HSC Module 84

Errors are displayed on the Connection tab of the Module Properties dialog box in RSLogix 5000 software and in the .EXERR field of the message variable when you reconfigure the module.

The final number of each code represents the channel number that is reporting the error: 1 = channel 0 and 2 = channel 1.

For example, code 16#0011 means that a BADCOUNT has occurred on channel 0.

The following table lists possible errors on your 1756-HSC module.

Counter Configuration Errors

Error Code Definition

16#0011, 16#0012 BADCOUNT - Occurs if you set the operational mode to a

value of seven or greater

16#0021, 16#0022 BADSTORE - Occurs if you set the Storage mode to a value

of six or greater or if the Storage mode is set to a nonzero value in Frequency mode

16#0031, 16#0032 BADROLL - Occurs if you program a nonzero value in Period

Rate/Continuous Rate frequency modes or if you program a value greater than 0xfffffe

16#0041, 16#0042 BADPRESET - Occurs if you program a nonzero value in

Period Rate/Continuous Rate frequency modes or if you program a value equal to or greater than the rollover value

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82 Module Diagnostics

Counter Configuration Errors

Error Code Definition

16#0051, 16#0052 BADSCALE - Occurs if you take any of the following

actions in the Counter/Frequency modes:

• Program a value greater than 2000 in Frequency mode

• Program a value that is not an integer multiple of 10 in

Frequency mode

• Program a value whose scaler is not equal to 0

Occurs in Period Rate/Continuous Rate modes if the scaler is not 0, 1, 2, 4, 8, 16, 32, 64, 128, 256

Output Configuration Errors

Error Code Definition

16#0061, 16#0062, 16#0063, 16#0064

16#0071, 16#0072, 16#0073, 16#0074

BADTIE - Occurs if you attempt to tie an output to a nonexistent counter or if you attempt to tie the output to two counters; valid entries are 0x0, 0x1,or 0x2

BADFAULT - Occurs if you configure the module for something other than On, Off, or Continue or if the 1756-HSC module receives a communication fault in Run mode; valid entries are 0x0, 0x1, and 0x2

RSLogix 5000 Diagnostics

16#0081, 16#0082, 16#0083, 16#0084

16#0091, 16#0092, 16#0093, 16#0094

BADPROG - Occurs if you configure the module for something other than On, Off, or Continue when transitioning from Run mode to Program mode; valid entries are 0x0, 0x1, and 0x2

BADWINDOW - Occurs if the On/Off values are greater than the 0xfffffe value

In addition to the Status Indicator display on the module, RSLogix 5000 software will alert you to fault conditions.

page 85

See

for details on status indicators.

Fault conditions in RSLogix 5000 software are reported in one of four ways.

• Warning signal on the main window next to the module - This occurs when the connection to the module is broken.

• Fault message in a window’s status line.

• Notification in the Tag Editor - General module faults also are reported in the Tag Editor. Diagnostic faults are reported only in the Tag Editor.

• Status on the Module Info tab.

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Module Diagnostics 83

The following windows display fault notification in RSLogix 5000 software.

Warning Signal on Main Window

A warning icon displays in the I/O Configuration tree when a communication fault occurs.

Fault Message in Status Line

On the Module Info tab, in the Status section, the Major and Minor Faults are listed along with the Internal State of the module.

Notification in Tag Editor

The Value field shows 65535 to indicate that the module connection has been broken.

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84 Module Diagnostics

Fault Type Determination

When you are monitoring a module’s configuration properties in RSLogix 5000 software and receive a Communication fault message, the Connection tab lists the type of fault under Module Fault.

Troubleshoot the 1756-HSC Module

This table describes troubleshooting procedures for the 1756-HSC module.

Description Take this action

The present count does not move into the stored count when Z-input is pulsed.

The counter does not increment or decrement when there are pulses on the A-input or B-input.

The output does not turn On when the On/Off window is selected and the counter value is within the On/Off window?

The outputs do not turn off despite a module fault.

The module outputs remain On when the owner-controller is in Program mode

An output must be forced On. Set the O.OutputControl[x] bit to 2. An output must be forced Off. Set the O.OutputControl[x] bit to 1.

1. Make sure the Storage mode is not set to 0.

2. Make sure the Z-input pulse width is within the specification (that is, the pulse width is long enough).

1. Make sure there is a value on the Rollover register.

2. Make sure the module is not configured for Frequency mode.

Make sure the C.Output[x].ToThisCounter is not set to 0 (which means ‘Not Tied to Counter’).

Make sure the C.Output[x].FaultMode is not set to 1 (which means ‘Outputs Turn Off’ during a fault).

Make sure C.Output[x].FaultMode is not set to 1 (which means ‘Outputs Turn Off’ during a fault.

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1756-HSC Status Indicators

Appendix

Introduction

Status Indicators

Each 1756-HSC module has indicators that show input and output status. Status indicators are located on the front of the module.

The 1756-HSC module uses the following status indicators.

The table describes what the status indicators represent, and corrective measures.

Status Indicator Display Means Action Taken

Input (A, B, Z)

Off Input turned off

Input not currently used Wire disconnected

On/Yellow Input turned on None

If you need to use the input, check wiring connections

Output (0, 1, 2, 3)

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Off Output turned off

Output not currently used

On/Yellow Output turned on None

If you need to use the output, check input wiring connections and your ladder program

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86 1756-HSC Status Indicators

Notes:

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1756-HSC Data Structures

IMPORTANT

Appendix

Configuration,Output,Input

There are three categories of 1756-HSC data structures.

• Configuration - structure of data sent from the controller to the 1756-HSC module upon powerup or user-initiated reconfigure command that defines the HSC module behavior.

• Output - structure of data continually sent from the controller to the 1756-HSC module that can modify the 1756-HSC module behavior.

• Input - structure of data continually sent from the 1756-HSC module to the controller containing the current, operational state of the 1756-HSC module.

This section describes the tags that comprise each of these data structures.

Configuration Structure

You must use configuration tags to alter module configuration. The table lists and defines 1756-HSC module configuration tags.

Some of the tags in the table below are followed by an ‘x’ or a ‘y’. The ‘x’ indicates the same tag information applies for Channel 0 and Channel 1 on the 1756-HSC module. The ‘y’ indicates the same tag information applies for the four outputs (0…3) on the 1756-HSC module.

1756-HSC Module Configuration Tags

Name Data

Ty pe

C.ProgToFaultEn BOOL Determines outputs’ state if connection is lost when the

C.Rollover[x]

DINT Decimal Designates the Rollover value.

Style Definition Change

owner-controller is in Program mode. 0 = Outputs use Program mode settings. 1 = Outputs use Fault mode settings.

Values range from 0…16,777,214.



IMPORTANT: This value must = 0 when you are using Period Rate and Continuous Rate modes.

-This setting may be overridden by the output tag setting. See

page 22

and

page 23

in Chapter 2 for details.

During Operation

Yes

(1)

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88 1756-HSC Data Structures

1756-HSC Module Configuration Tags

Name Data

Ty pe

C.Preset[x]

DINT Decimal Designates the Preset value. Module begins counting at



C.Scaler[x] INT Decimal When using Frequency mode, set this value as a multiple of

C.OperationalMode[x] SINT Decimal Designates an operational mode.

C.StorageMode[x] SINT Decimal Designates a storage mode.

C.ZInvert.x BOOL Decimal Designates whether the Z input is inverted.

C.FilterA.x BOOL Decimal Designates whether channel A uses a filter.

C.FilterB.x BOOL Decimal Designates whether channel B uses a filter.

C.FilterZ.x BOOL Decimal Designates whether channel Z uses a filter.

Style Definition Change

this value. Values range from 0…16,777,214.

IMPORTANT: This value cannot be > value also must = 0 when you are using Period Rate and Continuous Rate modes.

10 ms between 10-2000. If in Frequency mode and the value is 0, the module defaults to 1 second time base.

In Period Rate and Continuous Rate modes, the scaler determines the number of half-cycles of the incoming pulse train in the sample period. The 4 MHz count value in the Present Value tag is incremented within the pulse train set by the Scaler tag.

Acceptable numbers for the scaler are: 1, 2, 4, 8, 16, 32, 64, 128, 256. There is one Scaler value for each counter. The default value for each Scaler is 1; a 0 is equivalent to 1.

0 = Counter mode. 1 = Encoder x1 mode. 2 = Encoder x4 mode. 3 = Counter not used. 4 = Frequency mode. 5 = Period Rate mode. 6 = Continuous Rate mode.

0 = No store mode. 1 = Store and continue mode. 2 = Store, wait, and resume mode. 3 = Store and reset, wait, and start mode. 4 = Store and reset, and start mode.

0 = Do not invert Z input. 1 = Invert Z input.

0 = Do not use filter. 1 = Use 70 Hz.

the Rollover value. This

During Operation

Yes

(1)

-This setting may be overridden by the output tag setting. See

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page 22

and

page 23

in Chapter 2 for details.

Page 89

1756-HSC Module Configuration Tags

IMPORTANT

1756-HSC Data Structures 89

Name Data

Ty pe

C.Output[y].ONValue

DINT Decimal Designates the value at which an output turns On.



C.Output[y].OFFValue

DINT Decimal Designates the value at which an output



C.Output[y].ToThisCounter

SINT Decimal Designates the counter to which an output is tied.



C.Output[y].FaultMode

SINT Selects the behavior an output takes if a controller



C.Output[y].ProgMode

SINT Selects the behavior an output takes when transitioning into



Style Definition Change

During Operation

Yes

Values range from 0…16,777,214.

Yes turns OFF. Values range from 0…16,777,214.

Yes 0 = Not tied to counter. 1 = Tied to counter (0). 2 = Tied to counter (1).

Yes fault occurs. 0 = Outputs turn OFF. 1 = Outputs turn ON. 2 = Counter continues to determine outputs operation.

Yes Program Mode. 0 = Outputs turn OFF. 1 = Outputs turn ON. 2 = Counter continues to determine outputs operation.

(1)

-This setting may be overridden by the output tag setting. See

(1)

Configuration tags can be changed during operation by using a message Module Reconfigure command.

page 22

and

page 23

in Chapter 2 for details.

Output Structure

You must use output tags to change module configuration during operation. The table lists and defines 1756-HSC module output tags.

1756-HSC Module Output Tags

Name Type Style Definition Change

During

Operation

O.ResetCounter.x BOOL Decimal Resets counter and begins counting. The reset occurs only on

a zero to one transition. 0 = Do not reset. 1 = Reset.

Yes

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90 1756-HSC Data Structures

1756-HSC Module Output Tags

Name Type Style Definition Change

During Operation

O.LoadPreset.x BOOL Decimal Loads preset count value into counter and begins counting.

The preset occurs only on a zero to one transition. 0 = No action. 1 = Load preset.

O.ResetNewDataFlag.x BOOL Decimal Handshaking bit resets data in the I.NewDataFlag.x bit after

it has been processed. The reset occurs only on a zero to one transition. 0 = Do not reset the flag. 1 = Reset the flag.

O.OutputControl[y] SINT Decimal Overrides current state of output.

0 = Normal operation. 1 = Override value to Off. 2 = Override value to On.

O.RollOver[x]



DINT Decimal Designates the Rollover value.

Values range from 0…16,777,214. IMPORTANT: This value must = 0 when you are using Period Rate or Continuous Rate modes.

Yes

O.Preset[x]



O.Output.[y].OnValue

DINT Decimal Designates the Preset value. Module begins

counting at this value. Values range from 0…16,777,214. IMPORTANT: This value cannot be > the Rollover value. This value also must = 0 when you are using Period Rate or Continuous Rate modes

DINT Decimal Designates the value at which an output turns On.

Values are 0…16,777,214.

Yes



O.Output.[y].OffValue

DINT Decimal Designates the value at which an output turns Off.

Values are 0…16,777,214.

Yes



O.Output.[y].ToThisCounter



O.Output.[y].FaultMode



O.Output.[y].ProgMode



- If this setting is ever seen by the module as a non-zero value, it will override the corresponding configuration tag setting.

See

page 22

and

page 23

SINT Decimal Designates counter to which this output is tied.

0 = Not tied to counter. 1 = Tied to counter (0). 2 = Tied to counter (1).

SINT Decimal Selects the behavior this output takes if a controller

fault occurs. 0 = Outputs turn Off. 1 = Outputs turn On. 2 = Counter continues to determine outputs operation.

SINT Decimal Selects the behavior this output takes when the owner

transitions into Program mode. 0 = Outputs turn Off. 1 = Outputs turn On. 2 = Counter continues to determine outputs operation.

in Chapter 2 for details.

Yes

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1756-HSC Data Structures 91

IMPORTANT

Input Structure

You must use input tags to monitor module status. The table lists and defines 1756-HSC module input tags.

1756-HSC Module Input Tags

Name Type Style Definition

I.CommStatus DINT Decimal Displays module connection status.

0 = Module is connected. 65535 = Module is not connected.

I.PresentValue[x] DINT Decimal Displays the current count in the Counter and Encoder modes. Displays

counts per sample in Frequency, Period Rate, or Continuous Rate modes. Values range from 0…16,777,214.

I.StoredValue[x] DINT Decimal Displays the Stored Count value in the Counter and Encoder modes.

Displays the current frequency in Hz in Frequency, Period Rate, and Continuous Rate modes. Values range from 0…16,777,214.

I.Totalizer[x] DINT Decimal Displays the current frequency in Hz in Counter and Encoder modes.

Displays the total accumulated counts in Frequency, Period Rate, and Continuous Rate modes. Values range from 0…16,777,214.

I.WasReset.x BOOL Decimal Displays whether the counter was reset.

0 = Counter was not reset. 1 = Counter was reset.

I.WasPreset.x BOOL Decimal Displays whether the Preset value for the counter was loaded.

0 = Preset value was not loaded. 1 = Preset value was loaded.

I.NewDataFlag.x BOOL Decimal Displays whether the module received new data on the last scan.

0 = No new data was received. 1 = New data was received.

I.ZState.x BOOL Decimal Displays the Z state.

0 = Gate is low. 1 = Gate is high.

I.OutputState.y BOOL Decimal Displays the output state.

0 = Output is low. 1 = Output is high.

I.IsOverridden.y BOOL Decimal Determines whether output is overridden.

0 = Output is using On-Off window. 1 = Output is overridden.

I.CSTTimestamp DINT[2] Displays the coordinated system timestamp of the last sample

in microseconds.

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92 1756-HSC Data Structures

Notes:

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1756-HSC Module History

O K

COUNTER

DC I/O

ABZ

00O111

01OO23

O K

COUNTER

DC I/O

ABZ

00O111

01OO23

IMPORTANT

Appendix

Introduction

If you have module

Series

Using firmware revision

1.x

2.x

This appendix describe’s Logix5000 profiles for 1756-HSC modules:

• Series A, firmware revisions 1.x, 2.x, software versions 15…18.

• Series B, firmware revision 3.x, software versions 15…18.

The table shows the profiles available for your 1756-HSC module based on the series, firmware, and software version that you are running.

And your desired functionality is

Original

(see Important below)

Original

(see Important below)

Rollover and Preset

in Output Tags

Then use the Logix5000 profile Comment

Versions earlier than 15 => Thin profile/tags only Tag user-interface only Version 15 and later => Full profile support Tags with a GUI

interface Versions earlier than 15 => Thin profile/tags only Exact Match Keying Versions 15…17 => Full profile support

not supported

Version 18 and later => Select Major Revision 2 and HSC Data Comm Format

Versions earlier than 18 => Use generic profile/ HSC ACD File

(1)

Version 18 and later => Select Major Revision 2 and HSC Data-extended Comm Format

Tags with a GUI

interface

Tags with a GUI

interface. Totalizer

tags not active.

Versions earlier than 15 => Thin profile/tags only Exact Match Keying

not supported

Series

3.x

Original

(see Important below)

Rollover and Preset

in Output Tags

Period/Continuous

Rate

Versions 15…17 => Full Profile Support Version 18 and later => Select Major Revision 3

and HSC Data Comm Format Versions earlier than 18 => Use generic profile/HSC

ACD File

(1)

Version 18 and later => Select Major Revision 3 and HSC Data-extended Comm Format

Totalizer

(1)

File is located at

http://samplecode.rockwellautomation.com.

‘Original’ represents the four primary modes of operation initially designed for the 1756-HSC/A module, firmware revision 1.x. These modes are Counter, Encoder x1, Encoder x4, and Frequency.

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IMPORTANT

1756-HSC Profile Overview

There are three profiles available for programming your 1756-HSC module depending on your module’s firmware, software, and the desired functionality. As shown in the table on

• Full profile

• Thin profile

• Generic profile

Full profile support, for software versions 15 and later, include separate Counter and Output Configuration tab dialog boxes that make it easier to enter 1756-HSC operational data via a user-interface that provides error checking and user-friendly data entry. See with a full profile.

This section describes procedures for using a generic profile and modifying tags with a thin profile.

Software versions prior to 15 do not include a user-interface that provides error checking and user-friendly data entry. Instead, configuration tags have to be manually entered during the initial set-up. This is referred to as a thin profile.

page 93

, you will use either a:

Chapter 5

for configuring a module

A generic profile lets a prior software version use the functionality that’s available only for the latest software. For example, a 1756-HSC module, with software version 13, could use a generic profile to gain the output functionality, available in software version 18, that lets you modify the outputs in real-time by changing the rollover and preset values in the output tags.

A generic profile will create non specific tags, with a name related to the modules slot location. The tag names created will not reference any specific 1756-HSC module terminology.

To download firmware revisions for your module, go to

http://www.rockwellautomation.com/support

Downloads. Do not backflash your module’s firmware from firmware

revision 3.x to 2.x or 1x. Attempting to backflash or downgrade a module’s firmware from 3.x to 2.x or 1x will irreversibly damage the module.

1756-HSC modules at firmware revision 2.x or 1x cannot be flash upgraded to any firmware revision 3.x because 3.x modules have a hardware update.

and choose

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IMPORTANT

Configure a Generic Profile

You will use a generic profile if your application requires the use of rollover and preset in output tags and:

• your RSLogix 5000 software is earlier than version 18 for either module series A or B.

• your RSLogix 5000 software is earlier than version 18 for two additional module series B modes: Period Rate frequency, Continuous Rate frequency.

A generic profile copies an .ACD file that contains the identical tag structure that is included in software version 18. You must use the 1756-Generic Profile as indicated in the procedures.

Ladder logic lets you copy the module information between the user-defined data types and the module-defined data types to allow the controller and the 1756-HSC module to exchange data.

Before beginning configuration, you should download the following file for either the series A or series B application, ‘Generic Connection for the 1756-HSC Ser A Rev 2.1/Ser B Rev 3.X’.

This file is available at the Rockwell Automation Sample Code website (

http://samplecode.rockwellautomation.com

After you have downloaded and opened the sample code .ACD file, follow these steps to create a generic profile.

1. In RSLogix 5000 software, open or create a project for your controller.

From the File menu, choose New to access the New Controller dialog box to create a controller name.

2. On the Controller Organizer, right-click I/O Configuration and choose New Module.

The Select Module window appears.

3. Click the ‘+’ next to Other to display a list of I/O modules.

4. Select a generic module and click OK.

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IMPORTANT

The New Module dialog box appears.

5. Type a name for the module in the Name box.

6. In the Comm Format pull-down menu, choose Data-DINT.

The Data-DINT communication format must be chosen to use the correct connection parameters as shown in the sample New Module dialog box.

Also, in the generic module configuration, configuration data is created as an array of bytes. User-defined tags are copied over the array specified by the communication format selection.

7. Enter a module slot number that is specific to your chassis configuration.

Connection Parameters

In the right-side column of the New Module dialog box, there are entry fields for the Connection Parameters. You must set connection parameters for input, output, and configuration for the owner-controller to exchange information with the 1756-HSC module.

The Assembly Instance is a number that identifies what the data looks like that is transferred between the owner-controller and an I/O module.

The Size box determines how large the connections are between the owner-controller and the I/O module. Connections are sent in sizes matching the selected communication format data type.

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IMPORTANT

8. Enter Connection Parameters exactly as shown in the example below.

The generic connection works only with the matching Assembly Instance and Size parameters listed above for the input, output, and configuration settings.

9. Check Open Module Properties to access additional dialog boxes to enter information.

10. Click OK.

The Module Properties dialog box appears in the Connection tab.

11. Use the default RPI value and check Inhibit Module.

12. Click OK.

13. On the Controller Organizer, right-click I/O Configuration and choose

New Module.

Add a 1756-HSC module and assign it to an unused chassis slot in your I/O Configuration tree.

This module will not be used, but the configuration of this profile will aid later in the configuration of the generic module.

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14. Click OK.

The ladder logic in your RSLogix 5000 project will copy the module configuration from this profile to the generic profile.

15. Click OK.

16. Save the project.

Copy ACD file

1. Open the copied .ACD file in a new instance of RSLogix 5000 software.

2. In the Controller Organizer of the sample project, extend the

User-Defined Data Types to view the 1756-HSC data types.

3. Copy and paste each of the User-Defined Data Types (UDTs), one at a time, into your RSLogix 5000 project.

4. Do one of the following to create tags and specify the appropriate 1756-HSC module UDTs for each (HSC_CONFIG, HSC_IN_STRUCT, and HSC_OUT_STRUCT).

Define Your Own Tags

a. To define your own tags, double-click Controller Tags on the

Controller Organizer. b. Click the Edit Tags tab at the bottom of the Controller Tags window. c. In the blank entry field at the bottom of the window, enter your tag

name and data type.

Use Default Tags from RSLogix 5000 Software

a. To use default tags from RSLogix 5000 (which were imported from

the sample download at the start of these procedures), double-click Controller Tags on the Controller Organizer.

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1756-HSC Module History 99

b. Click the ‘+’ sign to expand and review each of the three UDTs

(HSC_CONFIG, HSC_IN_STRUCT, HSC_OUT_STRUCT).

Add Ladder Logic Routines

Ladder logic copies the module information from the user-defined data types to the module-defined data types. Otherwise, the controller and the 1756-HSC module will not be able to communicate.

Follow these necessary steps to copy the ladder logic routine from the example .ACD file.

1. On the Controller Organizer under Tasks, double-click Main Program.

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IMPORTANT

2. Double-click the .ACD file to access the ladder logic.

3. Paste the rungs into a routine of your 1756-HSC project.

4. If you are using RSLogix 5000 software, version 13 or earlier, or you did

not add an unused 1756-HSC module in

step 13

, delete rung 1 of the

copied and pasted ladder logic.

If you do not leave the unused 1756-HSC module in your project, or you have no other 1756-HSC module in your project, you cannot export and then re-import the project as the module-defined tags will not import properly.

A ladder logic routine also is suggested if you are using the HSC Data-extended Comm Format. This option allows you to change the output, rollover, and preset configuration settings in the output tags. The duplication of tag data could result in values being overridden when the HSC Data-extended Comm Format is selected.

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