Rockwell Automation 1756-DHRIO, 1756-DHRIOXT User Manual

User Manual

ControlLogix Data Highway Plus-Remote I/O Communication Interface Module

Catalog Numbers 1756-DHRIO, 1756-DHRIOXT

Important User Information

IMPORTANT

Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.

Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice.

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

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

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

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

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

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

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which 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.

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

Labels may also be on or inside the equipment to provide specific precautions.

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.

ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Allen-Bradley, ControlLogix, Data Highway Plus (DH+), Rockwell Software, Rockwell Automation, Studio 5000, Studio 5000 Automation Engineer ing & Design Environment, and Studio 5000 Logi x Designer are trademarks of Rockwe ll Automation, Inc.

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

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.

Top ic Pag e

Added references to 1756-DHRIOXT module Throughout

document

Added Installation chapter 37

Added hazardous information warnings and attentions to Installation chapter 37-40

Added references to Studio 5000 Throughout

document

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 3

Summary of Changes

Notes:

4 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Preface

About the Module

Using the Data Highway Plus Network

Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Studio 5000 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Chapter 1

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

What the Module Does. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Routing Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

DH+ and CIP Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Remote I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Configure Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Alphanumeric Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Prevent Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Chapter 2

What Is Data Highway Plus?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Link Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Trunk Line/Drop Line Considerations . . . . . . . . . . . . . . . . . . . . . . . . 22

Programming Terminal Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Connect Devices to the DH+ Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Application Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Two Methods of Communication Over a DH+ Network . . . . . . . . . . . 25

Use DH+ Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Local DH+ Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Remote DH+ Messaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Configuration Information in DH+ Messaging. . . . . . . . . . . . . . . . . . . . . 32

Generate Configuration Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Application Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Example DH+ Routing Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Use Control and Information Protocol (CIP) Messaging . . . . . . . . . . . . 35

Limitations of CIP Messaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Installing the Modules

Using Programming Software in DH+ Applications

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 5

Chapter 3

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Install the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Wire the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Network Connectors and Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Chapter 4

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Select the Correct Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Use RSLinx to Create a Routing Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table of Contents

Messaging Between PLC-5 and SLC 5/04 Controllers

What Is a Routing Table? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Pyramid Integrator Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

ControlLogix Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Create the Routing Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Configure the Controller Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Use RSLinx Software to Send Control and Information

Protocol Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Use RSLogix 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Studio 5000 Environment DH+ Application Example. . . . . . . . . . . 54

Use RSLogix 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

RSLogix 500 DH+ Application Example . . . . . . . . . . . . . . . . . . . . . . . 57

Use the Studio 5000 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Studio 5000 Environment DH+ Application Example. . . . . . . . . . . 61

Define Connection Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Connection path examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Chapter 5

DH+ Messaging: PLC-5 Controllers with One 1756-DHRIO . . . . . . . 68

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Configure a Routing Table for the 1756-DHRIO Module . . . . . . . 68

Configure Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

DH+ Messaging: SLC 5/04 Controllers with Two Modules in One

ControlLogix Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Configure a Routing Table for the 1756-DHRIO Modules . . . . . . 71

Configure Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

DH+ Messaging: PLC-5 Controllers with Multiple

ControlLogix Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Configure Routing Tables for the Modules . . . . . . . . . . . . . . . . . . . . . 75

Configure Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

DH+ Messaging: PLC-5 to PLC-5/C Controllers on the ControlNet

Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Configure a Routing Table for the 1756-DHRIO Module . . . . . . . 78

Configure Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Chapter 6

Messaging Between PLC-5 or SLC 5/04 Controllers and ControlLogix Controllers

6 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

DH+ Messaging: PLC-5 Controllers to One ControlLogix Controller

with One ControlLogix Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Configure a Controller Slot for the 1756-DHRIO Module. . . . . . . 81

Configure Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

DH+ Messaging: PLC-5 to Multiple ControlLogix Controllers in One

ControlLogix Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Messaging Between ControlLogix Controllers and PLC-5 or SLC 5/04 Controllers

Table of Contents

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Configure a Controller Slot for the Module . . . . . . . . . . . . . . . . . . . . 84

DH+ Messaging: SLC 5/04 to a ControlLogix Controller with

Multiple ControlLogix Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Configure a Routing Table for the Module . . . . . . . . . . . . . . . . . . . . . 86

Configure Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Chapter 7

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Local DH+ Messaging: ControlLogix Controller

in One Chassis to a PLC-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Configure Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

DH+ Messaging: ControlLogix Controller to a SLC 5/04 Controller

over ControlNet and DH+ Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Configure a Routing Table for the Module . . . . . . . . . . . . . . . . . . . . . 93

Configure Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Messaging Between ControlLogix Controllers

Using the 1756-DHRIO and 1756-DHRIOXT Modules in Remote I/O Applications

Chapter 8

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

CIP Messaging Between ControlLogix Controllers over One Link . . . 95

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Configure Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

CIP Message Routing Between ControlLogix

Controllers over Two Links. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Configure Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Chapter 9

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Introduction to Remote I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Select Devices that You Can Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Design a Remote I/O Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Network Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Cable Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

Trunk Line/Drop Line Considerations . . . . . . . . . . . . . . . . . . . . . . . 103

Module Operation in a Remote I/O Application . . . . . . . . . . . . . . . . . . 104

Exchange I/O Data Between the Module and Adapters . . . . . . . . . 105

Exchange I/O Data Between the Module and the ControlLogix

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

I/O Configuration Tree in Studio 5000 Environment Controller

Organizer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Remote I/O Scanner Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Adapter Module I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 7

Table of Contents

Using the Studio 5000 Environment in Remote I /O and Block Transfer Applications

Configure the Data Exchange Rate Between the Modules

and a Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Requested Packet Interval (RPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

RIO Scanner Status Update Rate with the Module

in a Local Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

RIO Scanner Status Update Rate with the Module

in a Remote Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Configure the Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Remote I/O Scanner Fault Notification . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Remote I/O Adapter Failure Notification . . . . . . . . . . . . . . . . . . . . . . . . . 111

Inhibit the Module Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Inhibit an Remote I/O Connector Adapter. . . . . . . . . . . . . . . . . . . . . . . . 111

Increased Remote I/O System Throughput . . . . . . . . . . . . . . . . . . . . . . . . 112

Chapter 10

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Use the Studio 5000 Environment in

Module Remote I/O Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Add the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Configure the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Add the Remote I/O Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Configure the Remote I/O Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Download the Project to the Controller . . . . . . . . . . . . . . . . . . . . . . . 119

Edit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Use the Studio 5000 Environment in 1756-DHRIO

Module Block Transfer Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Add the 1756-DHRIO or 1756-DHRIOXT Module . . . . . . . . . . 122

Configure the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Add the Remote I/O Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Configure the Remote I/O Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Add the Remote I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Configure the Remote I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Create a Block Transfer (Read or Write) Message Instruction . . . 130

Chapter 11

Connecting a ControlLogix Controller to Remote I/O

8 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Scan Remote FLEX Adapters through One 1756-DHRIO or

1756-DHRIOXT Module in a Local 1756-Chassis. . . . . . . . . . . . . . . . . 136

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Configure the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Configure the FLEX Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Scan Remote FLEX Adapters through Multiple 1756-DHRIO or

1756-DHRIOXT Modules in a Local Chassis . . . . . . . . . . . . . . . . . . . . . 138

Configure the Module Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Configure the First Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Configure the First FLEX Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Table of Contents

Configure the Second Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

Configure the Second FLEX Adapter . . . . . . . . . . . . . . . . . . . . . . . . . 140

Scan 1771 Remote I/O Adapters through a 1756-DHRIO or

1756-DHRIOXT Module in a Remote Chassis. . . . . . . . . . . . . . . . . . . . 141

Configure the 1756-DHRIO or 1756-DHRIOXT

Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Configure First 1756-CNB Module. . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Configure the Second 1756-CNB Module. . . . . . . . . . . . . . . . . . . . . 142

Configure the 1756-DHRIO or 1756-DHRIOXT Module. . . . . 143

Configure the 1771-ASB Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Run RSNetWorx Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Chapter 12

Block Transfers with the 1756-DHRIO or 1756-DHRIOXT Module

Troubleshooting the Module

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Block Transfer Fault Notification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Block Transfer ‘Pass-Through’ Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Block Transfer Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Block Transfers to Remote FLEX I/O Modules through

a 1756-DHRIO or 1756-DHRIOXT Module in a Local Chassis. . . . 147

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Configure the 1756-DHRIO or 1756-DHRIOXT Module. . . . . 147

Configure the FLEX Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Configure the Block Transfer Module. . . . . . . . . . . . . . . . . . . . . . . . . 148

Configure Message Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Block Transfers to Remote 1771-ASB I/O Modules through a 1756-DHRIO or 1756-DHRIOXT Module in a Remote Chassis. . . 150

Configure the Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Configure the First 1756-CNB Module . . . . . . . . . . . . . . . . . . . . . . . 151

Configure the Second 1756-CNB Module. . . . . . . . . . . . . . . . . . . . . 151

Configure the 1756-DHRIO or 1756-DHRIOXT Module. . . . . 152

Configure the 1771-ASB Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Chapter 13

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Check Power Supply and Module Status . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Minimizing False Received Frame with Bad CRC Messages. . . . . . . . . 156

PCCC Commands Supported by the Data Highway Plus Module

Appendix A

What This Appendix Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Echo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

ID Host and Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Read DH+ Diagnostic Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Reset DH+ Diagnostic Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 9

Table of Contents

Appendix B

Application Guidelines and Tips

Index

Cached and Uncached Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Cached Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Uncached Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

ControlLogix Controller Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Message Manager. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Messages Between a ControlLogix Controller and PLC Devices . . . . . 165

RPI Configuration Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

RPI Formula without Block Transfer Modules. . . . . . . . . . . . . . . . . . . . . 166

Digital Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Worst Case Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Increase the Unconnected Message Buffer Limit . . . . . . . . . . . . . . . . . . . 166

Increase Unconnected Message Buffer Configuration. . . . . . . . . . . 167

Increase Unconnected Message Buffer Source Data . . . . . . . . . . . . . 167

Remote I/O Performance: ControlLogix Controllers versus PLC-5

Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

DH+ Baud Rate Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Use Cached Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Use Uncached Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Maintain PCCC Message Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

10 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Preface

Purpose of This Manual

This manual describes how to understand, configure, and troubleshoot your ControlLogix® Data Highway Plus™ Remote I/O (1756-DHRIO) communication interface module and ControlLogix Data Highway Plus Remote I/O extreme temperature communication interface module.

This manual also provides step-by-step procedures on how to:

• use the 1756-DHRIO and 1756-DHRIOXT modules to send DH+™ messages between ControlLogix controllers, PLC and SLC controllers in DH+ applications.

• connect ControlLogix controllers to remote I/O and send block transfers via the 1756-DHRIO and 1756-DHRIOXT module.

Throughout this manual, we describe ControlLogix systems that use the 1756-DHRIO and 1756-DHRIOXT modules and ControlLogix controllers. Multiple ControlLogix controllers are available. The examples contained in this manual do not call out catalog numbers for ControlLogix controllers. Whenever a controller is shown, any of the controllers apply.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 11

Preface

Studio 5000 Environment

The Studio 5000 Automation Engineering & Design Environment™ combines engineering and design elements into a common environment. The first element in the Studio 5000® environment is the Studio 5000 Logix Designer™ application. The Logix Designer application is the rebranding of RSLogix™ 5000 software and continues to be the product to program Logix5000™ controllers for discrete, process, batch, motion, safety, and drive-based solutions.

The Studio 5000 environment is the foundation for the future of Rockwell Automation® engineering design tools and capabilities. This environment is the one place for design engineers to develop all elements of their control system.

Additional Resources

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

Resource Description

ControlLogix Controllers Selection Guide, publication 1756-SG001

Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

Product Certifications website, http://www.ab.com

Provides information and specifications for ControlLogix controllers

Provides general guidelines for installing a Rockwell Automation industrial system.

Provides declarations of conformity, certificates, and other certification details.

You can view or download publications at

http:/www.rockwellautomation.com/literature/

. To order paper copies of technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.

12 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

About the Module

Chapter

What This Chapter Contains

What the Module Does

This chapter describes the 1756-DHRIO and 1756-DHRIOXT modules and what you must know and do before you begin to use it.

Top ic Pag e

What the Module Does 13

Routing Limitations 14

Module Features 16

Prevent Electrostatic Discharge 19

Removal and Insertion Under Power 19

The Data Highway Plus/RIO module supports the following types of communication:

• Data Highway Plus™ (DH+) Messaging

• Control and Information Protocol (CIP) Messaging

• Remote I/O

You can send messages between devices on DH+ networks and devices on other networks such as ControlNet, Ethernet, or other DH+ networks.

A 1756-DHRIO channel functions as a scanner by using remote I/O functionality. The module transfers discrete and block-transfer data with remote I/O devices. This module enables connection to multiple remote I/O adapters.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 13

Chapter 1 About the Module

41275

Data Collection and Recipe Management

Programming Ter m i na l

Control Logix Chassis

Data Highway Plus

PLC-5

Data Highway Plus

SLC 500 RSView PLC-5 SLC 500 RSView

Routing Limitations

The modules can route a message through as many as four communication networks and three chassis. This limit applies to only the routing of a message and not to the total number of networks or chassis in a system.

DH+ and CIP Messaging

The modules allow an information exchange between devices, such as ControlLogix controllers, PLC and SLC controllers.

With these modules, you can exchange information in any of the following scenarios:

• Between PLC or SLC controllers on different networks

• Between the ControlLogix controllers and a PLC or SLC controller on

different networks

• Between ControlLogix controllers on different networks

The figure shows an example system. Two ControlLogix chassis link Data Highway Plus networks. Communication between PLC-5® programmable controllers on different networks is accomplished in the same manner used for communication within a network.

14 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

About the Module Chapter 1

41276

Control Logix Chassis

1756-DHRIOControlLogix Controller

1771-ASB

1746-ASB

PLC-5/20 in Adapter Mode

1794-FLEX I/O

Remote I/O

When a channel on the module is configured for Remote I/O, the module acts as a scanner for the remote I/O network. The ControlLogix controller communicates to the module’s remote I/O scanner to send and receive the I/O on the remote I/O network.

The figure shows an example system.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 15

Chapter 1 About the Module

41278

Network Type switches (behind cover)

41277

Network Address switches (behind cover)

Backplane connector (CIP=Port 1 )

Side view

Front view

Alphanumeric status indicator

Channel and module status indicators

8-pin Mini-DIN Programming Ter m i na l

Channel A (CIP=Port 2)

Wirin g label

Door

Channel B (CIP=Port 3)

Module Features

The figure shows the external features of the 1756-DHRIO and 1756-DHRIOXT modules.

Other module features include the following:

• Routing table that enables DH+ devices to use the modules and ControlLogix chassis to access other networks

• Routing communication to and from other modules

• No limit on number of modules per chassis, to the total number of

available slots and the capabilities of the power supply

• Can be removed and inserted under power without disrupting power to other modules in the chassis

16 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

About the Module Chapter 1

IMPORTANT

Network type switches (behind cover)

20810

Node type switches (behind cover)

This example shows channel A set for DH+ and channel B set RIO

This example shows the channel A node address at 010 and channel B at 024

Specify Network Type Set Switch

Channel

DH+ - 57.6K 0

RIO Scanner 1

DH+ - 115K 2

DH+ - 230K

(Only channel A suppor ts 230K

DH+. Channel B is disabled in this

mode.)

Not used 4-7

Channel

DH+ - 57.6K 0

RIO Scanner 1

DH+ - 115K 2

Not used 3-7

These node switches are not used with RIO.

Configure Switches

Before installing the module, you must set the network type switches for DH+ or RIO, depending on your application. For a channel configured as DH+, you must also select a node address within the range of 00-77. Node addresses are set and displayed in octal.

If your module uses the 230k DH+ network (that is Channel A switch set to

3), Channel B is disabled.

Also, node address switches do not apply if you are using remote I/O.

Set the network type and node address switches as shown in the Figure.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 17

Chapter 1 About the Module

CHA

CHB OK

H+/RIO

Alphanumeric status indicator illuminates and cycles through a sequence of messages (described in the table on the following page).

43241

EXAMPLE

Alphanumeric Indicators

At power-up the module’s alphanumeric display begins a cycle through the following sequences.

• Channel A and the network used for channel A - DH+ or RIO

• Channel A node address, if used for DH+

• Channel A status

• Channel B and the network used for channel B - DH+ or RIO

• Channel B node address, if used for DH+

• Channel B status

This sequence runs continuously during normal module operation.

For example, if your module uses the following:

• Channel A for DH+ with node address 14

• Channel B for RIO

and the channels are operating properly, you see the following sequence:

• A DH, A#14, A OK, B IO, SCAN, B OK

For a detailed list of the status and error messages that can be displayed across the alphanumeric indicators, and for troubleshooting information, see Chapter 13

18 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

About the Module Chapter 1

Prevent Electrostatic Discharge

Removal and Insertion Under Power

The Data Highway Plus module is sensitive to electrostatic discharge.

ATTENTION: 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.

You can install or remove the module while chassis power is applied if you observe the following precautions.

WARNING: 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 the module and its mating connector. Worn contacts can create electrical resistance that can affect module operation.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 19

Chapter 1 About the Module

Notes:

20 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Chapter

Using the Data Highway Plus Network

This chapter describes the basics of Data Highway Plus (DH+) and the operation of a DH+ network.

Top ic Pag e

What Is Data Highway Plus? 21

Connect Devices to the DH+ Network 23

Two Methods of Communication Over a DH+ Network 25

Use DH+ Messaging 25

Configuration Information in DH+ Messaging 32

Application Timeout 33

Example DH+ Routing Configuration 34

Use Control and Information Protocol (CIP) Messaging 35

What Is Data Highway Plus?

On the most basic level, Data Highway Plus is a wire or cable and a protocol that connects computers and peripheral devices so that they can communicate. The wire used for a network is called the network medium.

A DH+ link transfers data between ControlLogix controllers, PLC and SLC controllers, and other devices that use the DH+ network. These devices are called stations. You can connect a maximum of 32 stations to one DH+ link.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 21

Chapter 2 Using the Data Highway Plus Network

IMPORTANT

Link Design

When you design your DH+ link, use good design practices, including laying out the link before installation. We also recommend you consider the following when designing your DH+ link:

• All performance requirements

• Maintenance

• Possible future changes to the link

Use a1770-CD (Belden 9463) cable to connect your 1756-DHRIO module to DH+. Use a Belden 89463 cable to connect your 1756-DHRIOXT module to DH+. Connect a DH+ network by using a daisy chain or trunk line/drop line configuration.

Trunk Line/Drop Line Considerations

When using a trunk line/drop line configuration, use 1770-SC station connectors and follow these cable-length guidelines:

• trunk line-cable length - depends on the communication rate of the link

• drop-cable length - 30.4 m (100 cable-ft.)

Verify that your system’s design plans specify cable lengths within allowable measurements.

The maximum cable length for DH+ depends on the transmission rate. Configure all devices on a DH+ link to communicate at the same transmission rate.

For daisy chain configurations, use the following table to determine the available total cable length.

A DH+ link using this communication rate: Cannot exceed this cable length:

57.6 kbps 3,048m (10,000 ft)

115.2 kbps 1524m (5,000ft)

230.4 kbps 762m (2,500 ft)

For proper operation, terminate the ends of a DH+ link by using the external resistors shipped with the module. The following table lists the resistors you can use with each communication rate.

If your DH+ I/O link operates at: Use this resistor rating:

57.6 kbps 150 Ω

115.2 kbps 150 Ω

230 kbps 82 Ω

22 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Using the Data Highway Plus Network Chapter 2

41279

Programming Terminal Connector

Channel A

IMPORTANT

Programming Terminal Port

The programming terminal connector is the same physical link as Channel A.

When configuring the module switches, remember the programming terminal connector can be used only if Channel A is set for DH+.

Connect Devices to the DH+

The following table lists the devices you can connect to a DH+ link.

Network

To: You can use: Cat. No.: Required

Connect PLC-3 family processors to DH+ Scanner Communication Adapter Module 1775-S5 1770-CD or

1775-SR5

Connect PLC-5 family processors to DH+ Classic and Enhanced PLC-5 processors using on-board DH+ ports 1785-Series 1770-CD or

ControlNet and EtherNet PLC-5 processors using on-board DH+ ports

Connect SLCs to DH+ SLC 5/04 Controller 1747-Series 1770-CD or

Connect PI systems to DH+ Resource Manager Module 5130-RM1 1770-CD or

Resource Manager Module 5130-RM2

Data Highway/Data Highway Plus Communication Interface Module

Perform data transmission, management, and local network diagnostics over DH+ network

Add memory, storage, and I/O capabilities to computers through DH+

Connect other SLC controllers to DH+ SLC 5/04 1747-Series 1770-CD or

Connect AutoMax to DH+ AutoMax DH+ Interface 57C-442 1770-CD or

KTX Communication Interface Card 1784-KTX 1770-CD or

KTXD Communication Interface Card 1784-KTXD 1770-CD or

PCMK Communication Card 1784-PCMK PCM6/B cable

5130-KA

Cables

Belden 89463

assembly

Belden 89463

(1)

(1) Use 1770-CD for 1756-DHRIO modules and Belden 89463 for 1756- DHRIOXT modules.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 23

Chapter 2 Using the Data Highway Plus Network

Application Guidelines

Consider the following application guidelines when configuring a DH+ link for your system:

• Minimize the number of DH+ nodes to achieve acceptable response times. Keep in mind the size and frequency of messages exchanged between devices.

• Limit the number of stations on your network when you are trying to achieve the fastest control response time. Establish separate DH+ networks to bring-on additional stations.

• Do not add or remove stations from the network during machine or process operation. If the network token resides with a device that is removed, the token can be lost to the rest of the network. The network is automatically reestablished, but it could take several seconds. Control is unreliable or interrupted during this time.

• When possible, do not program controllers online during machine or process operation. This could result in long bursts of DH+ activity, increasing response time.

• When possible, add a separate DH+ link for programming processors to keep effects of the programming terminal from the process DH+ link.

24 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Using the Data Highway Plus Network Chapter 2

Two Methods of Communication Over a DH+ Network

Use DH+ Messaging

The 1756-DHRIO and 1756-DHRIOXT modules act as a bridge for two methods of communication. These methods are:

• DH+ Messaging

• Control and Information Protocol (CIP) Messaging

The following table lists the devices that support each communication method.

Type of communication: Devices and Software supporting this type:

DH+ messaging PLC-3

PLC-5 PLC-5/250 SLC 500 ControlLogix controllers RSLinx software Interchange software

Control and Information Protocol (CIP) messaging

ControlLogix controller Studio 5000 environment

DH+ Messaging offers the following benefits:

• You can send messages between devices on the same link.

• You can send messages between devices on different links.

• It is compatible with many Rockwell Automation® modules.

DH+ messaging is divided into two types:

• Local DH+ Messaging

- See page 25

• Remote DH+ Messaging - See page 28

Before you can design a control system to meet your application needs, be aware of the difference between Local DH+ Messaging and Remote DH+ Messaging.

Local DH+ Messaging

Devices use local DH+ messaging to communicate between devices on the same physical link. A device that uses local DH+ messaging must:

• generate local DH+ packets.

• support local DH+ protocol.

• send and receive messages.

A local DH+ message sent on a DH+ network has only enough address information to get the message to a target node on the same DH+ network.

The example in the following figure shows a PLC-5 controller sending a message to port A on the 1756-DHRIO and 1756-DHRIOXT modules. Because the

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 25

Chapter 2 Using the Data Highway Plus Network

1756- DHRIO

PLC-5 Controller B Node Number: 025

Channel A Node Number: 010 Controller Slot= 0

ControlLogix Controller

41458

IMPORTANT

controller slot for port A is configured to “0”, the message is forwarded to the ControlLogix controller in slot 0.

Receiving Local DH+ Messages on DH+

Because a local DH+ message has only enough address information to get the message to a target node on the same DH+ network, the 1756-DHRIO and 1756-DHRIOXT modules that receive this message cannot identify where to send the message. The 1756-DHRIO and 1756-DHRIOXT modules use the Controller Slot configuration parameter to send the message to the local controller.

You must use RSLinx software to configure the controller slot. For more information on setting the controller slot, see page 51

Some messages, called PCCC commands, are not sent to the controller slot. In this case, the 1756-DHRIO and 1756-DHRIOXT modules generate a response to the message. For a complete list of these messages, see Appendix

Local DH+ messaging does not require a populated routing table. Local DH+ messaging does require a default (that is a properly emptied) or an applied (that is a properly populated and saved) routing table, and a default or applied controller slot for each channel configured for DH+. For more information on routing tables, see Chapter 3

Local DH+ Messaging can target only one ControlLogix controller per DH+ channel. The ControlLogix controller must reside in the same chassis as the 1756-DHRIO and 1756-DHRIOXT modules receiving the message.

26 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Using the Data Highway Plus Network Chapter 2

IMPORTANT

Sending Local DH+ Messages on DH+

If a 1756-DHRIO channel receives a DH+ message with a destination link ID=0 from a ControlLogix controller in the same chassis, the module sends the message as a local DH+ message.

The target of the DH+ message must be on the same DH+ link as the 1756DHRIO and 1756-DHRIOXT modules sending the message. Also, the ControlLogix controller must reside in the same chassis as the 1756-DHRIO and 1756-DHRIOXT modules sending the message on DH+.

Limitations of Local DH+ Messaging

When using Local DH+ Messaging, you must remember:

• The DH+ message contains only a node ID for a node on the DH+ network.

• A local DH+ message sent to the node ID of a port on the 1756-DHRIO and 1756-DHRIOXT modules is forwarded to one user-configured controller slot.

• Messages on one DH+ network cannot be routed to other networks.

Routing Error in Local DH+ Messaging

If the module has a problem with routing a DH+ message, it can return a response with an error status of D0 hex. A PLC-5 displays this error as D000 hex when monitoring the message instruction. If you receive this error message, perform the following actions:

• Check your message instruction to make sure a destination node was entered.

• Check your default slot configuration to make sure that it matches the location of the ControlLogix controller in the chassis.

• Make sure power is applied to the module.

Programming Message Block Instructions in a Controller for Local DH+ Messaging

Before programming your message block instructions in your controller, you must:

• Determine which links send and receive DH+ Local messages.

• Draw a network to make sure you meet the design requirements for Local

DH+ messages.

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 27

Chapter 2 Using the Data Highway Plus Network

IMPORTANT

• Assign DH+ node numbers.

• Use the Studio 5000 environment to enter the controller slot or execute

the default for the controller slot for each channel configured for DH+.

These configuration steps must be done for each 1756-DHRIO or 1756-DHRIOXT in the your system.

Remote DH+ Messaging

Devices use remote DH+ messaging to communicate between devices on physically separate networks. A device that uses remote DH+ messaging must be able to perform the following:

• Generate Remote DH+ packets.

• Support Remote DH+ protocol.

• Send and receive messages.

Use remote DH+ messaging when the following conditions apply:

• The message originating device or the message target device is one of the devices listed in the table on page 25

• A DH+ link is in the message’s path from originator to target.

• The message originating device and the message target device are on

separate networks or the message target is in a ControlLogix chassis and multiple ControlLogix controller targets are in the chassis.

28 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

Using the Data Highway Plus Network Chapter 2

ControlLogix Chassis

1756-DHRIO and 1756-DHRIOXT Modules

PLC-5/25 Controller A - Node:010

Link ID 1

PLC-5 Controller B - Node: 030

41363

Link ID 2

Channel A - Node: 020

Channel B - Node: 025

IMPORTANT

The following figure shows an example of remote DH+ messaging between PLC processor A and PLC processor B. In this example, the following information must be included in the remote DH+ message routing message instruction:

• local DH+ node = 020

• destination link ID = 2

• remote DH+ node = 030

Link IDs

To use remote DH+ messaging, each network that is an originating network or target network requires a unique link ID. The modules require these link IDs to be decimal values between 1-199. Each DH+ channel on a 1756-DHRIO or 1756-DHRIOXT module requires its own unique link ID.

The message originates on the source network. The destination network is the message’s target network. This applies to all source and destination networks, including DH+, ControlNet, Ethernet and a ControlLogix chassis.

For remote DH+ messaging, the ControlLogix chassis is considered a separate, independent network. Therefore, a system of 1 DH+ network and one ControlLogix chassis is a two-link system.

The ControlLogix chassis is required to be a separate, independent link for DH+ messaging if multiple message target ControlLogix controllers are in a ControlLogix chassis.

Routing Tables in Remote DH+ Messaging

The modules contain a routing table that you define for your application. The routing table contains information used to steer remote DH+ messages through the system to ‘remote’ nodes on separate networks. By using the routing table, the

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 29

Chapter 2 Using the Data Highway Plus Network

1756-DHRIO and 1756-DHRIOXT modules enable devices, such as PLC-5s, to use “DH+ Remote Addressing” for messaging.

You must use RSLinx to configure your routing table. For more information on routing tables, see page 46

Programming Message Block Instructions in a Controller for Remote DH+ Messaging

Before programming your message block instructions in your controller, you must perform the following:

• Determine which links will send and receive remote DH++ messaging.

• Draw a network to make sure you meet the design requirements for remote

DH+ messaging.

If you are using remote DH+ messaging, you must also perform the following:

• Assign link numbers. The numbers must be a decimal value between 1-

199. ControlLogix chassis can also be assigned link IDs. Remember that the programming terminal and channel A are the same physical link.

• Assign DH+ node numbers.

• Use RSLinx software to load routing tables into each 1756-DHRIO and

1756-DHRIOXT module.

When using remote DH+ messaging, you must include the following in the message instruction:

• Destination link ID - A user-defined number representing a network in your system.

• Remote node or slot - The node or slot on the remote network with which you want to communicate.

If the message originates on DH+, you must also include:

• local DH+ node - The node on your local DH+ network capable of routing the message.

If the message originates on Ethernet or ControlNet networks or ControlLogix controllers, you must also include a CIP path to the first 1756-DHRIO and 1756-DHRIOXT modules.

Limitations of Remote DH+ Messaging

Remote DH+ Messages are encapsulated in CIP messages and sent on CIP connections when they are sent across ControlNet, Ethernet, and the ControlLogix chassis backplane. Resource limits are associated with CIP on the

30 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014

+ 146 hidden pages