Rockwell Automation 1797-OE8H User Manual

FLEX Ex HART
Analog Modules

1797-IE8H, 1797-OE8H

User Manual

Important User Information

Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application,
Installation and Maintenance of Solid State Controls (Publication SGI-1.1
available from your local Rockwell Automation sales office or online at
http://literature.rockwellautomation.com) describes some important
differences between solid state equipment and hard-wired electromechanical
devices. Because of this difference, and also because of the wide variety of
uses for solid state equipment, all persons responsible for applying this
equipment must satisfy themselves that each intended application of this
equipment is acceptable.

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

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

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

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

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

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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.

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

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

• recognize the consequence

Labels may be located on or inside the equipment to alert people
that dangerous voltage may be present.

Labels may be located on or inside the equipment to alert people
that surfaces may be dangerous temperatures.

Allen-Bradley, FLEX Ex, ControlNet Ex, PLC, RSNetWorx, RSLogix5, and Logix5000 are trademarks of Rockwell Automation, Inc.

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

Summary of Changes

What’s Changed

The following table lists items changed since the last printing.

Changes See

Removed the word bit in Command 12 B-2

Removed the word bit in Command 17 B-2

Added Device-specific Commands B-3 to B-24

To help you find new and updated information in this release of the manual,
we have included change bars as shown next to this paragraph.

1 Publication 1797-6.5.3 - March 2006

Summary of Changes 2

Notes:

Publication 1797-6.5.3 - March 2006

Summary of Changes

Table of Contents

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

What’s Changed . . . . . . . . . . . . . . . . . . . . . . . . . Summary of Changes-1

Preface

About the FLEX Ex HART Analog
Modules

Why Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Who Should Read This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

What This Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

For Additional Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Chapter 1

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

What the FLEX Ex Analog

I/O Modules Do . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

How FLEX Ex Analog Modules Communicate with Programmable

Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Events After Cycling Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Physical Features of Your Analog I/O Module . . . . . . . . . . . . . . . . . 1-3

Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Using Alarms on the 1797-IE8H Module. . . . . . . . . . . . . . . . . . . . . . 1-3

Data Format Alarm Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Remote Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Local Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

How to Use the HART Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

HART Implementation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

HART Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

HART Target Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

HART Command Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

HART Initialize Tags. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

HART Initialize Channel Tags . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Modify Your Ladder-Logic Routine . . . . . . . . . . . . . . . . . . . . . . 1-13

Selecting the Correct Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Chapter 2

Understand Configurable FLEX Ex
Analog Module Features

1 Publication 1797-6.5.3 - March 2006

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Selecting a 1797-IE8H FLEX Ex Analog Input Module’s

Operating Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Remote Transmitter Error Up or Down . . . . . . . . . . . . . . . . . . . 2-3

High Low Error Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Input Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Selecting a 1797-OE8H FLEX Ex Analog Output Module’s

Operating Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Table of Contents 2

Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Latch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Global Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Analog Digital State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Analog Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Analog Fault State Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Digital Fault State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Understanding Image Table Mapping and Bit/Word Descriptions 2-12

Bit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Analog Input Module (1797-IE8H) Image Table Mapping. . . . 2-13

Bit/Word Description for the Analog Input Module

(1797-IE8H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Analog Output Module (1797-OE8H) Image Table Mapping . 2-16

1797-IE8H and -OE8H Extended Configuration Data Table . . . . 2-19

Secondary Master Enable (SME) and Primary Master

Inhibit (PMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

How to Install Your FLEX Ex
Analog Modules

Chapter 3

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Before You Install Your Analog Module . . . . . . . . . . . . . . . . . . . . . . 3-1

Compliance to European Union Directives . . . . . . . . . . . . . . . . . . . . 3-2

EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

ATEX Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Installation in Zone 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Installation in Zone 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Electrostatic Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Mount on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Panel/Wall Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Mounting the Analog Modules on the Terminal Base Unit. . . . . 3-9

Wire the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Connecting Wiring to the FLEX Ex I/O Analog Modules. . . . . . . 3-11

Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Connections for the 1797-IE8H Module . . . . . . . . . . . . . . . . . . 3-11

Connections for the 1797-OE8H Module . . . . . . . . . . . . . . . . . 3-13

Ground the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Publication 1797-6.5.3 - March 2006

Table of Contents 3

Publication 1797-6.5.3 - March 2006

Table of Contents 4

Input, Output and Configuration
Files
for the Analog I/O Modules on the
ControlNet Network

Calibrate Your Module

Chapter 4

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Using Programming Software in Your FLEX Ex Application . . . . . 4-2

About the ControlNet Ex Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Communication Over the FLEX Ex Backplane. . . . . . . . . . . . . . . . . 4-3

Scheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Unscheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Adapter Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Fault State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Idle State Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Chapter 5

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

When and How to Calibrate Your FLEX Ex Analog I/O Module . 5-2

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

1797-IE8H Calibration Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

1797-IE8H Calibration Command Structure . . . . . . . . . . . . . . . . . . . 5-4

1797-IE8H Calibration Command Byte. . . . . . . . . . . . . . . . . . . . 5-5

1797-IE8H Calibration Item Byte Channel-Mask . . . . . . . . . . . . 5-8

1797-IE8H Calibration with Offset and Gain . . . . . . . . . . . . . . 5-11

1797-OE8H Calibration Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

1797-OE8H Calibration Command Byte . . . . . . . . . . . . . . . . . . 5-13

1797-OE8H Calibration Item Byte Channel-Mask . . . . . . . . . . 5-19

1797-OE8H Calibration Flowchart Procedure . . . . . . . . . . . . . 5-21

Apply FLEX Ex Analog I/O Modules

Publication 1797-6.5.3 - March 2006

Chapter 6

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Evaluate the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Define the Area Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Decide Classification Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Determine Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Determine Temperature Rating . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Select Protection Method(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Match Field Devices and I/O Modules . . . . . . . . . . . . . . . . . . . . . . . 6-3

P/I Analog Transmitter Functional and IS Parameters. . . . . . . . 6-3

1797-IE8H Functional and IS Parameters . . . . . . . . . . . . . . . . . . 6-4

Loop Functionality Verification . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Intrinsic Safety Entity Verification . . . . . . . . . . . . . . . . . . . . . . . . 6-6

I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Troubleshoot the FLEX Ex
Analog I/O Modules

Specifications

Table of Contents 5

Optimize Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Assigning Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Chapter 7

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1797-IE8H Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1797-OE8H Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Appendix A

1797-IE8H Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

1797-IE8H CE, CENELEC I/O Entity Parameters. . . . . . . . . A-3

1797-IE8H UL, C-UL I/O Entity Parameters. . . . . . . . . . . . . . A-4

1797-IE8H FM I/O Entity Parameters . . . . . . . . . . . . . . . . . . . A-7

1797-OE8H Output Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10

1797-OE8H CENELEC I/O Entity Parameters . . . . . . . . . . A-11

FLEX Ex HART Module Commands

Appendix B

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Protocol Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Device-specific Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Command 128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Command 129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Command 130 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

Command 131 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7

Command 132 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8

Command 133 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8

Command 134 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9

Command 135 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10

Command 136 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-11

Command 137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12

Command 138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-13

Command 139 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14

Command 140 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-15

Command 141 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-16

Command 143 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17

Command 144 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-17

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Table of Contents 6

Additional HART Protocol
Information

Command 145 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-18

Command 146 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-19

Command 147 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20

Command 148 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-20

Command 149 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-21

Command 152 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-21

Command 154 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-22

Command 158 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-23

Command 159 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-24

Command 164 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-24

Appendix C

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Message Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Master-slave Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Multiple Master Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Transaction Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Burst Mode (not supported) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2

Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

Configure the 1797-OE8H Module
in RSLogix 5000 Software Over the
ControlNet Network

Appendix D

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

Analog Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4

Latch Retry Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

Analog/Digital Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5

Digital Fault State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6

Analog Fault State Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6

Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

Digital Output Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

Global Reset Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

Analog Output Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

Diagnostic Status Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

HART Rebuild Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-8

HART Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9

HART Readback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9

HART Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9

HART Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-10

Publication 1797-6.5.3 - March 2006

Configure the 1797-IE8H Module in
RSLogix 5000 Software Over the
ControlNet Network

Table of Contents 7

Appendix E

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Data Format Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4

Up/Down Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

High and Low Error Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5

Square Root Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

Analog Input Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7

Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8

Local Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8

Remote Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8

Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-9

FLEX Ex HART Modules Network
Messaging

Appendix F

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Differences Between Attributes and Assembly Indexes . . . . . . . . . . F-3

HART Frame Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6

Index

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Installation Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

New Product Satisfaction Return . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Publication 1797-6.5.3 - March 2006

Table of Contents 8

Publication 1797-6.5.3 - March 2006

Preface

Why Read This Manual

Who Should Read This Manual

About the Vocabulary

What This Manual Contains

Chapter Title Contents

1 About the FLEX Ex HART Analog

2 Understand Configurable FLEX Ex

This manual shows you how to use your FLEX Ex analog modules with the
ControlNet Ex products and ControlNet network. The manual helps you
install, program, and troubleshoot your module.

You must be able to program and operate a ControlNet Ex product and
ControlNet network to make efficient use of a FLEX Ex module.

In this manual, we refer to the:

• 1797-IE8H as the input module

• 1797-OE8H as the output module

The following chart lists each chapter with its corresponding title and a brief
overview of the topics covered in that chapter.

Describes module functionality and physical

Modules

Analog Module Features

features

Describes configurable module features and
configuration bits

3 How to Install Your FLEX Ex Analog

Modules

4 Input, Output and Configuration Files

for the Analog I/O Modules on the
ControlNet Network

5 Calibrate Your Module Lists the tools needed, and the methods used to

6 Apply FLEX Ex Analog I/O Modules Describes how FLEX Ex is different from

7 Troubleshoot the FLEX Ex Analog I/O

Modules

Appendix Title Contents

A Outlines module specifications and accuracy

B Explains how to program the analog modules

C Additional HART Protocol Information Discusses the HART protocol and provides

How to install and wire the modules

Describes how to use these I/O modules over the
ControlNet network

calibrate the module

traditional control systems

How to use the indicators to troubleshoot your
module

references for additional information.

1 Publication 1797-6.5.3 - January 2006

Preface 2

D Configure the 1797-OE8H Module in

E Configure the 1797-IE8H Module in

F FLEX Ex HART Modules Network

For Additional Information

1797 Series FLEX Ex Selection Guide 1794-SG002

1797 Series ControlNet Ex System Cable Guide 1797-6.2.1

1797-TB3 FLEX Ex Terminal Base

1797-TB3S FLEX Ex Spring Clamp Terminal Base

1797-OE8H FLEX Ex HART 8 Output Analog Module 1797-5.3 1797-6.5.3

1797-IRT8 FLEX Ex RTD/Thermocouple/mV Module 1797-5.4 1797-6.5.2

1797-IE8H FLEX Ex HART 8 Input Analog Module 1797-5.5 1797-6.5.3

1797-OB4D 4 Output Module 1797-5.6

1797-IBN16 FLEX Ex NAMUR Digital Input Module 1797-5.7

1797-PS2E2 FLEX Ex Power Supply 1797-5.8

1797-IJ2 2 Frequency Input Module 1797-5.9 1797-6.5.4

1797-PS2N2 FLEX Ex Power Supply 1797-5.12

1797-BIC FLEX Ex Bus Isolator

1797-CEC FLEX Ex Flexbus Connector

1797-ACNR15 ControlNet Ex Adapter 1797-5.14

1797-RPA, -RPFM Fiber Hub 1797-5.15

1797-TPR, -TPRS,

-TPYR, -TPYS

1797-CE1S, -CE3S,

-CEFTN, -CEFTE

1797-EXMK Marker Kit 1797-5.23

1797-PS1E FLEX Ex Power Supply 1797-5.33

1797-PS1N FLEX Ex Power Supply 1797-5.34

1797-BCNR FLEX Ex Redundant ControlNet Barrier Module 1797-5.35

Provides the information necessary to configure

RSLogix 5000 Software Over the

the 1797-OE8H analog output module.

ControlNet Network

Provides the information necessary to configure

RSLogix 5000 Software Over the

the 1797-IE8H analog input module.

ControlNet Network

Discusses how to communicate with the HART

Messaging

modules via the MSG or CIO instruction,
differences between attributes and assembly
indexes, and enhancements to the HART frame.

For additional information on FLEX Ex systems and modules, refer to the
following documents.

Catalog
Number

FLEX Ex Taps

Interconnect Cables

Description

Installation
Instructions

1797-5.1

1797-5.13

1797-5.18

1797-5.20

Publications

User Manual

1797-6.2.1

Publication 1797-6.5.3 - January 2006

Chapter

About the FLEX Ex HART Analog Modules

1

What This Chapter Contains

What the FLEX Ex Analog I/O Modules Do

Read this chapter to familiarize yourself with the input and output analog
modules.

For See

What the FLEX Ex Analog I/O
Modules Do

How FLEX Ex Analog Modules
Communicate with Programmable
Controllers

Physical Features of Your Analog I/O
Module

Chapter Summary 1-15

The 1797-IE8H module accepts up to 8 analog inputs. The inputs are
non-isolated and will accept current in either of the following two ranges: 4 to
20 mA or 0 to 20mA. The default input range is 0 to 20 mA. The inputs have
both fixed hardware filters and selectable firmware digital filters.

Similarly, the 1797-OE8H module provides as many as eight analog outputs.
The outputs are nonisolated and will provide current in either of the following
two ranges: 4 to 20 mA or 0 to 20 mA. The default output range is 0 to 20 mA.

1-1

1-2

1-3

Each module offers host of features including:

• Local microprocessor intelligence for advanced features

• Full functionality without switches or jumpers

• Multiple data ranges that can be independently programmed

in channel groups

• Lead breakage detection

• Overrange/underrange alarms

• Remote transmitter alarm

1 Publication 1797-6.5.3 - March 2006

1-2 About the FLEX Ex HART Analog Modules

How FLEX Ex Analog Modules Communicate with Programmable Controllers

FLEX Ex analog I/O modules provide best utility when used with ControlNet
Ex products on the ControlNet network. Data connections are established
between the I/O module and an Allen-Bradley programmable controller to
transfer information between the two at a scheduled rate.

Input module information is then automatically made available in the PLC
data table through the data connection. Reciprocally, output data information
determined by the PLC program is also automatically transferred from the
PLC data table to the output module through the data connection.

In addition, when the data connection is originally established, configuration
information for the module is automatically transferred to it via the network.

Events After Cycling Power

You must apply intrinsically safe +/-V power to your FLEX Ex analog I/O
modules. The following sequence of events occurs after power has initially
been applied to your module:

• The module begins an internal diagnostic check. The channel 0 LED

indicator turns ON to indicate the check has begun. The indicator turns
OFF when the check is finished.

• After the diagnostic check, module configuration information, selected

by the user and downloaded over the network, is applied by the module.

For more information on configuration options, see Chapter 2.

• Following the module configuration download for the 1797-IE8H

module, the module begins producing runtime data for the PLC.

• Following the module configuration download for the 1797-OE8H

module, the module applies configuration data to output channels.

• If any diagnostics or alarms are generated during normal module

operation, the data is returned to the PLC controller.

Publication 1797-6.5.3 - March 2006

About the FLEX Ex HART Analog Modules 1-3

Physical Features of Your Analog I/O Module

The module label identifies the keyswitch position, wiring and module type.
Use the removable label to note individual designations per your application.

Indicators

Indicators are provided to identify input or output fault conditions, and to
show when power is applied to the module. For example, the 1797-IE8H
module is shown below.

1797-IE8H

Module Type

Removable Label

Ex

8 CHANNEL ANALOG INPUT

IN1IN0 IN2 IN3 IN4

Input Designators

IN5

1797-IE8

IN6 IN7

PWR

Keyswitch Position

3

Indicator (#3)

Power On Indicator

40070

Using Alarms on the 1797-IE8H Module

The 1797-IE8H FLEX Ex module is capable of generating four alarms:

• Underrange

• Overrange

• Remote Fault

• Local Fault

These alarm conditions are described in general terms and as they relate to bits
on the FLEX Ex I/O module on the following pages. The following graphic
shows at what values these alarms are generated for Data Format 4.

Publication 1797-6.5.3 - March 2006

1-4 About the FLEX Ex HART Analog Modules

0 mA 4 mA 20 mA 22 mA

Remote Fault Remote Fault

Data Format Alarm Example

In this example, the normal active data range is 4 to 20 mA. The alarms are
generated in three overlapping bands.

PHYSICAL INPUT SIGNAL RANGE

Underrange Overrange

Local
Fault

Local
Fault

-25.00%

-12.50%

Programmable

in 20 0.1 mA

Steps by Error

Level 0.1 mA

Steps

Parameter

0.00%

Remote Transmitter Error

Up/Down Parameter

Determines Which of These

is Active

100.00% 112.50%

Programmable

in 20 0.1 mA

Steps by Error

Level 0.1 mA

Steps

Parameter

Overrange Alarm

The Overrange alarm notifies you when module input is overrange. When the
input signal exceeds 100% (20 mA), an Overrange Alarm is generated.

This alarm stays active at any value above 100% of range and is always enabled
by the module.

Underrange Alarm

41666

Publication 1797-6.5.3 - March 2006

The Underrange alarm works in a fashion converse to the overrange. This
feature notifies you when the input signal falls underrange. If the input signal
falls below 0% (4 mA), an Underrange Alarm is generated.

This alarm stays active at any value below 0% of range and is always enabled by
the module.

About the FLEX Ex HART Analog Modules 1-5

Remote Fault Alarm

The Remote Fault Alarm is primarily intended for use with remote transmitter
loops.

For example, the remote transmitter may be measuring temperature and
converting it to a standard mA signal. In such a loop, though, the input module
cannot determine the state of the loop on the far side of the transmitter.
However, the remote transmitter may be capable of diagnosing a problem in
the remote loop and signal the input module local loop with a preprogrammed
out of range (high or low) value.

The Remote Fault Alarm allows the 1797-IE8H module to work with
transmitters like the one just described. You must use the Remote Transmitter
Error Up or Down feature, see page 2-3, to configure your application for
Remote Fault notification.

For example, you must determine if you want a remote fault to cause
high out of range values or low out of range values to be returned to
the controller.

IMPORTANT

Once the alarm is issued, it remains active as long as the input
signal value remains above the programmed value.

Use Remote Fault Alarm to Determine High High or Low Low Alarm Levels

If you do not have a remote transmitter in your loop, this alarm can also be
used to program a high high or low low alarm level between the levels which
actuate the overrange or underrange alarms and the high or low local fault
alarms.

IMPORTANT

When establishing high high or low low alarms, you can only
select one side (high or low). You must use the Remote
Transmitter Error Up or Down feature in conjunction with this
alarm.

Publication 1797-6.5.3 - March 2006

1-6 About the FLEX Ex HART Analog Modules

Program the Remote Fault Alarm

For the Remote Fault alarm, you must program the threshold in 0.1 mA steps
at any level on the high or low end of input signal range. The Remote Fault
alarm activates if your I/O module receives input signal values of:

• 100.63% (20.1 mA) to 111.88% (21.9 mA) on the high end of input

signal range

or

• -0.63% (3.9 mA) to -11.88% (2.1 mA) on the low end of input

signal range

IMPORTANT

This alarm is only active for one band, either on the high side of
normal operation or the low side.The Remote Transmitter Error
Up/Down parameter determines which side is active. See page
2-3 for a description of the Remote Transmitter Error Up/Down
feature.

Local Fault Alarm

The Local Fault alarm notifies you when the loop to the transmitter or field
device, if no transmitter is used, is open or shorted.

IMPORTANT

• 112.50% (22 mA) or higher on the high end of input signal range - This

value indicates a short in the loop.

or

Once the alarm is issued, it remains active as long as the input
signal value remains in the programmed range.

Publication 1797-6.5.3 - March 2006

• -12.50% (2 mA) or lower on the low end of input signal range

- This value indicates an open wire condition in the loop.

The Remote Fault and Local Fault alarms are issued with the same bit whether
the cause is an under or overrange. Monitor the Overrange and Underrange
bits in your programming software to determine if the problem is a high
current or low current.

About the FLEX Ex HART Analog Modules 1-7

How to Use the HART Capabilities

HART Implementation Overview

Before using the HART capabilities, be sure that:

• the I/O module and the associated field device are working properly in

the analog 4 to 20 mA mode.

• the I/O module is configured for 4 to 20 mA range.

• the field device is HART capable.

• no more than one HART field device is connected to each channel.

• input filtering is set to a valid (defined) value.

The FLEX Ex HART modules act as intelligent HART multiplexers. Basically,
the module learns which HART devices are attached to its channels and then
routes HART messages, as appropriate, between the HART field devices and
the Flexbus. Since the HART modules act as intelligent HART multiplexers,
HART commands can be issued to the HART modules themselves.

Communication on the Flexbus occurs between the adapter and the HART
module. The adapter converts these messages to the appropriate network
format for communication with the controlling controller. The controlling
controller gets its command from the user program, storing the responses in
its memory.

Controller

User Program

Command

For Example,
ControlNet

Response

Adapter FLEX Ex HART

I/O Module

Flexbus 4 to 20 mA

HART
Field Device

In its basic form, your ladder-logic program issues an MSG instruction
containing a HART command. The MSG instruction is routed to the
appropriate adapter and FLEX Ex I/O module. Upon receiving the message,
the HART module routes the message to the appropriate channel and gathers
the HART field device response. To retrieve this response, your ladder-logic
program issues another MSG instruction.

Publication 1797-6.5.3 - March 2006

1-8 About the FLEX Ex HART Analog Modules

HART Commands

Building a usable HART command for the MSG instruction involves an
understanding of how to create a standard HART command plus the
additional knowledge of how to pack the message into a ControlNet frame. To
simplify this process, you can download the ladder-logic program discussed
here at http://www.ab.com/io. This ladder-logic program consists of a main
program and several subroutines. Modify the main program to meet your
application needs.

The first routine is HART_initialize. Use this routine after a power cycle or
reset to enable HART functionality on a specific FLEX Ex HART module and
to rebuild the associated HART loops to its field device(s). Once a FLEX Ex
HART module is initialized, it remembers the HART addresses of the field
devices and associates them to their corresponding analog channel. This
routine calls the Get_Status_with_retry subroutine to poll an answer from the
target I/O module.

The second routine is Send_Hart_SF. This routine accepts a generic HART
message to a specific I/O channel and returns a generic HART response. This
routine calls the Get_Message_with_retry subroutine to poll a response from
the target I/O module.

The third routine is Purge. If a communication error is found, this routine is
called to empty the HART buffer in the FLEX Ex HART I/O module.

Use the remaining routines to execute specific HART commands. Each
routine is dedicated to its associated HART command. For example, the
HART_CMD_3 issues a HART command 3 to the specified target device.

To issue a HART command, after the FLEX Ex HART I/O module is
initialized, fill the tag HART_Target with the associated information to
uniquely describe the path to the target. If the HART command requires
information to be send to the target device, then fill a second tag with the
appropriate information.

For example, to send a HART command 3, fill the HART_Target tag. As this
is a HART read command, no other information is necessary. To send a
HART command 35, fill the HART_Target tag. As this is a HART write
command, also fill the CMD35_cmd tag with appropriate data.

Publication 1797-6.5.3 - March 2006

About the FLEX Ex HART Analog Modules 1-9

HART Target Tags

The HART_Target tag consists of four members:

• Path — HART_Target.Path

The Path specifies the direction the message follows to get to the
desired target node. The data type is string.

• Slot — HART_Target.Slot

The Slot indicates the specific place where the I/O module is attached
to the FLEX Ex adapter. The data type is SINT.

1 = the closest module to the adapter

8 = the module farthest from the adapter

0 = the adapter

• Channel

The Channel indicates which analog channel, 0 to 7, is desired. The data
type is SINT.

• Host_Group

The FLEX Ex HART modules have two message-access ports into
them allowing two systems to gather information from the module
concurrently. The data type is SINT.

The HART_Groups are numbered either 1 or 2. If there are no other
systems accessing the FLEX Ex Hart I/O module, that is, an asset
management system, then select the first HART_Group by setting this
value to 1.

IMPORTANT

If multiple owners access or control the same FLEX Ex HART I/O
module and field device, they must maintain identical
configurations.

Publication 1797-6.5.3 - March 2006

1-10 About the FLEX Ex HART Analog Modules

HART Command Tags

The response from the HART command routines is located in their associated
reply tags:

• CMDx_Status (x is the specific command)

Table 1.1 CMDx_Status Tags

Tag Name Description Data Type

CMDx_Status.Started Indicates when the command is in

process

CMDx_Status.Done Indicates when the command has

completed without error

CMDx_Status.Error Indicates when the command has

completed with error

CMDx_Status.Error_Code If the CMDx_Status.Error bit is set,

the associated error code is placed
here

CMDx_Status.Cmd_Performed If the CMDx_Status.Done bit is set,

the tag containing the HART
command performed is placed here

BOOL

INT

• CMDx_Reply (x is the specific command)

This tag is only returned when the specific HART command has data in
its reply. The CMDx_Reply tag contains the HART response
reformatted to their associated data type.

Table 1.2 CMD3_Reply Tags Example

Tag Name Description Data Type

CMD3_Reply.Current_mA The measured current value REAL

CMD3_Reply.PV_Units_Code The units code for the primary value INT

Publication 1797-6.5.3 - March 2006

CMD3_Reply.Primary_Value The primary value REAL

CMD3_Reply.SV_Units_Code The units code for the secondary

value

CMD3_Reply.Secondary_Value The secondary value REAL

CMD3_Reply.TV_Units_Code The units code for the third value INT

CMD3_Reply.Third_Value The third value REAL

CMD3_Reply.FV_Units_Code The units code for the fourth value INT

CMD3_Reply.Fourth_Value The fourth value REAL

INT

About the FLEX Ex HART Analog Modules 1-11

You r
Ladder-logic
Program

HART_Target

CMDx_cmd

Status

CMDx_reply

HART_CMD_x

Convert CMD
Data Type to
Generic HART
Frame

Convert Generic
HART Reply
Frame to Specific
Reply Data Type

Generic_HART
Command Frame

Generic_HART
Reply Frame

Status

Send_HART_SF

Send Message
to Target and
Poll for a
Response

HART Initialize Tags

The HART_Target tag consists of four members:

• Path — HART_Target.Path

The Path specifies the direction the message follows to get to the
desired target node. The data type is string.

• Slot — HART_Target.Slot

The Slot indicates the specific place where the I/O module is attached
to the FLEX Ex adapter. The data type is SINT.

1 = the closest module to the adapter

8 = the module farthest from the adapter

0 = the adapter

• Channel

The Channel indicates which analog channel, 0 to 7, is desired. The data
type is SINT.

Publication 1797-6.5.3 - March 2006

1-12 About the FLEX Ex HART Analog Modules

• Host_Group

The FLEX Ex HART modules have two message-access ports into
them allowing two systems to gather information from the module
concurrently.

The HART_Groups are numbered either 1 or 2. If there are no other
systems accessing the FLEX Ex Hart I/O module, that is, an asset
management system, then select the first HART_Group by setting this
value to 1. The data type is SINT.

IMPORTANT

If multiple owners access or control the same FLEX Ex HART I/O
module and field device, they must maintain identical
configurations.

HART Initialize Channel Tags

The channel member of the HART_Target tag is a decimal number that
indicates which channel is the target. The channels’ member of the
HART_initialize tag consists of eight one bit flags.

0 = Search for a HART Field Device on the

Ch 7 Ch 6 Ch 5 Ch 4 Ch 3 Ch 2 Ch 1 Ch 0

IMPORTANT

To make the HART_initialize routine run effectively, only enable
channels with active HART field devices.

Associated Channel

1 = Disables Searching for a HART Field
Device on the Associated Channel

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Table 1.3 HART_Init_Status Tags

Tag Name Description Data Type

HART_Init_Status.Started Indicates when the command is in

process

HART_Init_Status.Done Indicates when the command has

completed without error

HART_Init_Status.Error Indicates when the command has

completed with error

HART_Init_Status.Error_Code If the CMDx_Status.Error bit is set,

the associated error code is placed
here

HART_Init_Status.HART_Channels_
Found

If the CMDx_Status.Done bit is set,
the tag containing the list of
channels with active HART field
devices

BOOL

INT

When these tags are initialized, a JSR to the HART_initialize routine is
performed.

Modify Your Ladder-Logic Routine

With this background information, it is now time to modify the routine to
meet the needs of your application. To do so, perform the following steps:

1. Make sure your wiring is correct and make note of your node address,
the slot location of the FLEX Ex HART I/O module and the channel
with your field device.

2. Load the program into Logix5000 software.

3. Modify the members of the HART_initialize tag to match your setup.

4. Modify the members of the HART_Target tag to match your setup.

5. If you plan to use a HART write command, which requires data to be

sent to the field device, modify the associated CMDx_cmd tag with the
associated data.

6. Download the program to the ControlLogix controller.

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7. Place the controller into RUN mode.

This assumes you will re-write the Main Routine to meet your
application.

8. Refer to the following list of error codes if an error is returned from one
of the following routines:

Table 1.4 HART_Initialize Routine

Error Code Description

-1 Could not enable HART LEDs

-2 Could not rebuild HART loops

-3 Routine timed out

-4 Could not get status from Rebuild HART
Loops command

Table 1.5 HART_CMD_x Routine

Error Code Description

-1 Invalid slot number

-2 Invalid expected data size

-3 Invalid Host Group number

-4 Could not get a response

Once you have modified your ladder-logic routine, the ladder logic will now
call the HART_initialize routine. The yellow LEDs on the associated channels
of the selected FLEX Ex HART module will start to flash. This indicates that
the module has received the command and is in the process of searching for
HART field devices on the associated channels. Upon successful completion
of the HART_initialize routine, the HART_Init_Status_Done flag is set. At
this point, the ladder logic will examine the contents of the HART_Cmd tag
and attempt to issue the HART command associated with the decimal number
contained in this tag. Any HART replies are placed in their associated
CMDx_reply tag. To issue a different command, change the value of the
HART_Cmd tag to match the desired HART Command.

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Selecting the Correct Path

The Path is a string that specifies the direction the message follows to get to a
desired node. The MSG instruction requires a specific format for the string,
consisting of a number sequence with each number separated by a $ sign. The
message sequence is performed in sequential order from the perspective of the
controller.

EXAMPLE

A path of $01$03$02$05 is interpreted as:
$01 = Go out the backplane port of the 1756
controller

$03 = Go to the module in slot 3 of the 1756 chassis

(1)

$02 = Go out the front communications port of the
module
$05 = Go to node address 5

(1)

Assume that a 1756-CNB is in slot 3.

If you are using a ControlLogix system, the numbers $01 and the $02 will
usually be in these sequence locations. The $03 may vary depending on the slot
location of your network module. The $05 will vary according to your target
address. If you need to bridge to other networks, then additional numbers will
be needed in the sequence. For more details on this method, search in the
Logix5000 Help.

Chapter Summary

In this chapter, you learned about FLEX Ex analog I/O modules and HART
module capabilities. Move on to Chapter 2 to learn about configurable features
on your module.

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Notes:

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