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FLEX
User Manual
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Rockwell Automation FLEX User Manual

FLEX I/O Isolated Input/ Output HART Analog Modules
Catalog Numbers 1794-IF8IH, 1794-OF8IH, 1794-IF8IHNFXT
User Manual
Original Instructions
FLEX I/O Isolated Input/Output HART Analog Modules User Manual

Important User Information

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.
IMPORTANT
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).
2 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020

Preface

Why Read This Manual

Who Should Use This Manual

About the Vocabulary

This manual shows you how to use your FLEX™ I/O analog modules with the ControlNet® products and ControlNet network, and Ethernet products and EtherNet/IP™ network. The manual helps you install, program, and troubleshoot your module. This manual:
You must be able to program and operate a ControlNet product and ControlNet or Ethernet network to make efficient use of a FLEX I/O module.
In this manual, we refer to the:
• 1794-IF8IH and 1794-IF8IHNFXT as the input modules
• 1794-OF8IH as the output module
Related Documentation
The following documents contain additional information concerning Rockwell Automation® office or distributor.
Resource Description
FLEX I/O 8 Isolated Input HART Analog Module Installation Instructions, publication 1794-IN115
FLEX I/O 8 Isolated Output Analog Module Installation Instructions, publication 1794-IN120
FLEX I/O-XT 8-Input Channel Isolated HART Analog Module, publication 1794-IN134
FLEX I/O and FLEX XT I/O Selection Guide, publication
1794-SG002
DTM Library FLEX and FLEX EX Release Notes, publication 1794-RN068
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1
Allen-Bradley Industrial Automation Glossary, AG-7.1
Common Techniques Used
The following conventions are used throughout this manual:
in this Manual
Information on wiring and installing the 1794-IF8IH HART input module.
Information on wiring and installing the 1794-OF8IH HART output module.
Information on wiring and installing the 1794-IF8IHNFXT HART XT input module.
A description and overview of the 1794 and 1797 series FLEX I/O modules compatible control platforms, and overview of how to specify a FLEX I/O system.
Web updates for FLEX I/O and FLEX EX I/O DTM libraries.
More information on proper wiring and grounding techniques.
. A glossary of industrial automation terms and abbreviations.
• Bulleted lists such as this one provide information, not procedural steps.
• Numbered lists provide steps or hierarchical information.
• Italic type is used for emphasis.
Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Notes:
4 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
Summary of Changes
About the FLEX I/O HART Analog Modules

Table of Contents

Why Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Common Techniques Used in this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . 3
New and Updated Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
What FLEX I/O Analog Modules Do . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Communicate with Programmable Controllers . . . . . . . . . . . . . . . . . . . . . 14
Events Following Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Physical Features of Your Module 15
Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Use Alarms on the Input Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Low Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
High Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Remote Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Local Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Use the HART Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
HART Implementation Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Configurable FLEX I/O Analog Module Features
Install Your FLEX I/O Analog Modules
Chapter 2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Select Your Analog Input Module Operating Features. . . . . . . . . . . . . . . 20
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Sample Filter Frequency Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Select Your Analog Output Module Operating Features. . . . . . . . . . . . . 21
Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Latch Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Global Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Understand Image Table Mapping and Bit/Word Descriptions . . . . . . 24
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 3
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Before You Install Your Analog Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Install the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Mount on a DIN Rail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Mount on a Panel or Wall. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Mount the Analog Modules on the Terminal Base Unit . . . . . . . . . 32
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Wire the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Connect Wiring to the FLEX I/O HART Analog Modules. . . . . . . . . . 34
Connections for the 1794-OF8IH HART Analog Output Module on
a 1794-TB3 or 1794-TB3S Terminal Base Unit. . . . . . . . . . . . . . . . . . 37
Ground the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Chapter 4
Configuration
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Data Transfer Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Configuration Parameters for 1794-IF8IH . . . . . . . . . . . . . . . . . . . . . . . . . 41
Configuration Parameters for 1794-IF8IHNFXT. . . . . . . . . . . . . . . . . . . 43
Configuration Parameter Descriptions for 1794-IF8IH and
1794-IF8IHNFXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Byte Order (Configuration Word 0 – bits 0…1, 8…9). . . . . . . . . . . . 44
Fault Mode (Configuration Word 0, bits 2…5, 10…13) . . . . . . . . . . 47
Digital Filter (Configuration Words 4…7 – bits 0…2, 8…10) . . . . . 47
Data Format (Configuration Words 2, 3 – bits 0…3, 4…7, 8…11,
12…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Remote Low Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Remote High High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
HART Disable Channel 0…7 (Configuration Word 1 – bits 8…15) .
55
HART Current Fault Limit (Configuration Words 4…7 – bits 3…7,
11…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
HART Data Publishing Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Enable HART PV Upper and Lower Range (Configuration Word
105, bits 8...15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Enable HART PV Damping Value (Configuration Word 105,
bits 0…7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Primary Input Data (RTD Input Data) for 1794-IF8IH and
1794-IF8IHNFXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Primary Input Data (Input Words 0…7 – bits 0…15) . . . . . . . . . . . . 58
Module Diagnostic Status (Input Word 10 – bits 0…7) . . . . . . . . . . 59
HART Failure (Input Word 11 – bits 0…7). . . . . . . . . . . . . . . . . . . . . 62
HART Current Ratio (Input Word 11 – bits 8…15) . . . . . . . . . . . . 62
HART Transmitter List (Input Word 10 – bits 8…15) . . . . . . . . . . 63
Secondary Input Data (Cyclic EDT Input Data) for 1794-IF8IH and
1794-IF8IHNFXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
HART Command 3 Communication Status (Secondary Input Word
0, bits 0…7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
HART Field Device Command and Communication Status
(Secondary Input Word 2, bits 0…7) . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
HART Field Device Status (Secondary Input Word 2 – bits 8…15). . 65
HART Loop Status (Secondary Input Word 3 – bits 0…7). . . . . . . 66
HART PV Status (Secondary Input Word b, bits 8…15). . . . . . . . . 67
HART Primary Variable (Secondary Input Words 4, 5 – bits 0…15). 67 HART Secondary Variable (Secondary Input Words 6, 7 – bit 0…15) 67 HART Third Variable (Secondary Input Words 8, 9 – bits 0…15) 67 HART Fourth Variable (Secondary Input Words 10, 11 – bits 0…15) 68 HART Primary Variable Units Code (Secondary Input Word 12 –
bits 0…7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
HART Secondary Variable Units Code (Secondary Input Word 12 –
bits 8…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
HART Third Variable Units Code (Secondary Input Word 13 – bits
0…7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
HART Fourth Variable Units Code (Secondary Input Word – bits
8…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
RTD Output Data for
1794-IF8IHNFXT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Module Configuration for the 1794-OF8IH . . . . . . . . . . . . . . . . . . . . . . . 69
Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Configuration Parameters for 1794-OF8IH . . . . . . . . . . . . . . . . . . . . . . . . 70
Configuration Parameter Descriptions for 1794-OF8IH . . . . . . . . . . . . 72
Byte Order (Configuration Word 0 – bits 0…1, 8…9) . . . . . . . . . . . 72
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Fault Mode (Configuration Word 0 – bit 15). . . . . . . . . . . . . . . . . . . 74
Disable HART Channel 0…7 (Configuration Word 17 – bits 0…7) .
75
HART Current Ratio (Configuration Words 4…7 – bits 3…7,
11…15.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Data Format (Configuration Words 2, 3 – bits 0…3, 4…7, 8…10,
12…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Latch Mode (Configuration Words 4…7 – bits 2, 10) . . . . . . . . . . . 78
Analog/Digital Output Mode (Configuration Word 8 – bits 0…7) 79
Analog Fault Mode Selection (Configuration Words 4…7 –
bits 0…1, 8…9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Analog Fault Value Output Data (Configuration Words 9…16 –
bits 0…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Digital Mode Fault State (Configuration Word 8 – bit 8…15). . . . 80
HART CMD 3 Disable (Configuration Word 7 – bits 0…7). . . . . 81
Primary Input Data (RTD Output Data) for the
1794-OF8IH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Fault Alarm (S0 Read Word – bits 8…15) . . . . . . . . . . . . . . . . . . . . . . 83
Diagnostic Data (S0 Read Word – bits 0…7). . . . . . . . . . . . . . . . . . . . 83
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
HART Status Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
HART Current Fault (S2 Read Word – bits 8…15) . . . . . . . . . . . . . 85
HART Transmitter List (S3 Read Word – bits 8…15) . . . . . . . . . . . 85
Primary Output Data (RTD Output Data) for 1794-OF8IH . . . . . . . . 85
Analog Output Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Digital Output Data (O0 Read Word – bits 0…7) . . . . . . . . . . . . . . . 85
Global Reset (O0 Read Word – bit 14) . . . . . . . . . . . . . . . . . . . . . . . . . 86
Fault (EDT Write Word – bit 14) and Run/Prog (EDT Write Word
– bit 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Secondary Input Data (Cyclic EDT Input Data) for 1794-OF8IH . . . 87
Secondary Data Table Section Created by the Adapter. . . . . . . . . . . 88
HART Command 3 Communication Status (Input Word 0 –
bits 0…7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
HART Field Device Status (Secondary Input Word 2 –
bits 8…15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Interpret the Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Edit Your 1794-IF8IHNFXT Configuration with Studio 5000 Logix Designer
(Full Profile) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
General Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Connection Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Configuration Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Alarm Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
HART Command Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Calibration Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
HART Device Info Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Chapter 5
Getting HART Data Using CIP MSG Instructions
8 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Use RSNetWorx to Send and Receive CIP MSG Instructions . . . . . . . 107
Access HART Data Using CIP Message Instruction (MSG). . . . . 110
Fill in the Information Needed for a MSG Instruction . . . . . . . . . . 111
Select the Attribute Value for the Operation You Want
to Perform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Retrieve Additional Information About the HART Device . . . . . 113
Get Device Info Block 1 Message for 1794-IF8IH
and 1794-OF8IH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Get Device Info Block 2 Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Get Device Info Block 3 Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Reset the Device Info Changed Status Bit Message. . . . . . . . . . . . . . 121
HART Pass-through Message Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Format a HART Pass-through Init Request Message. . . . . . . . . . . . 124
Format a Get Pass-through Message Status Request. . . . . . . . . . . . . 125
HART Failed Reason Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Format a Read Pass-through Reply Request . . . . . . . . . . . . . . . . . . . . 127
Troubleshoot Your Module
Use the 1794-IF8IH Module with the Generic Profile
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Chapter 6
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Interpret Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Hardware Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Module Configuration Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
HART PV Configuration Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
HART Failure Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Appendix A
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Byte Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
HART Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Channel Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Digital Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Low Alarm Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Remote High High Alarm Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Remote Low Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
HART Command 3 Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Input Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Input Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
High Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Low Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Out of Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Second Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
HART Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
HART Current Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
HART Transmitter Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Use the 1794-IF8IHNFXT with the Generic and Thin Profiles
Rockwell Automation Publication 1794-UM065D-EN-P - April 2020 9
Appendix B
Edit a Thin Profile Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Configure a Generic Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Define Your Own Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Reference Configuration Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Byte Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
HART Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Channel Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Digital Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Remote High High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Remote Low Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
PV Damping Value (32-bit floating point, LowWord) . . . . . . . . . . 169
HART Command 3 Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Input Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Input Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
High Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Low Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Out of Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Second Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
HART Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
HART Current Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
HART Transmitter Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Use the 1794-OF8IH Module with the Generic Profile
Index
Appendix C
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Background Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Local Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
HART Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Channel Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Analog Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Digital Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Digital Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Analog Fault Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
HART Command 3 Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Digital Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Fault Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Analog Data 191
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
HART Current Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
HART Transmitter Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
10 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020

Summary of Changes

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

New and Updated Information

This table contains the changes made to this revision.
Topic Page
Corrected wiring diagram 35
Corrected wiring instructions 36
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Notes:
12 Rockwell Automation Publication 1794-UM065D-EN-E - April 2020
Chapter
IMPORTANT
IMPORTANT
IMPORTANT
1
About the FLEX I/O HART Analog Modules

Overview

This chapter describes the FLEX I/O Highway Addressable Remote Transducer (HART) analog modules and what you must know and do before you begin to use them.
Read this chapter to familiarize yourself with the HART analog modules.
Topic Page

What FLEX I/O Analog Modules Do 13

Communicate with Programmable Controllers 14
Use Alarms on the Input Modules 15
Use the HART Capabilities 17
HART Implementation Overview 18
Chapter Summary 18
To use all features of these modules it must be used with the 1794-ACN(R)15 with version 5.001 firmware or later, or the 1794-AENT with firmware revision 4.002 and later, or the 1794-AENTR with firmware version 1.011 and later.
For more information about using these modules with 1794-ACN(R)15 with firmware revision 5.001 and later, see 1794-RN071
.
Studio 5000 Logix Designer version 24 includes a full profile for 1794-IF8IHNFXT module. You cannot use the 1794-IF8IH profile to configure the 1794-IF8IHNFXT module.
See Use the 1794-IF8IHNFXT with the Generic and Thin Profiles on
page 153 if you are using RSLogix 5000 version 23 or earlier.
The Studio 5000 Logix Designer application is the re-branding of the RSLogix 5000 application.
What FLEX I/O Analog
The FLEX I/O HART input and output modules must be used in a ControlNet or EtherNet/IP network.
Modules Do
The 1794-IF8IH module accepts up to eight analog inputs. The inputs are isolated and will accept current in either of the following two ranges: 4…20 mA or 0…20 mA. The default input range is 0…20 mA. The inputs have both fixed hardware filters and selectable firmware digital filters.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
The 1794-IF8IHNFXT module supports 0…20 mA and 4…20 mA ranges, with a default input range of 0…20 mA. It has seven selectable input filters and seven input data formats. It provides support for loop alarm, which detects gross signal errors such as open and short circuit. It has programmable user alarms (high, low, remote high high, and remote low low). The module has a HART modem per channel. It is compliant with HART versions 5, 6, and 7, except for multi-drop support.
The 1794-OF8IH module provides as many as eight (8) analog outputs. The outputs are isolated and will provide current in either of the following two ranges: 4…20 mA or 0…20 mA. The default output range is 0…20 mA.
Each module offers:
• full functionality without switches or jumpers.
• multiple data ranges that can be independently programmed for each
• lead breakage detection.
• overrange/underrange alarms.
• remote transmitter alarm.
channel.

Communicate with Programmable Controllers

Data connections are established between the FLEX I/O module and an Allen-Bradley® programmable controller (PLC) 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 Following Powerup
You must apply +24V DC power to your FLEX I/O analog I/O modules. The following sequence of events occurs after power has initially been applied to your module:
1. The module status indicator will blink red until a connection is established and a valid configuration is passed to the module.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Module type
Removable label
Keyswitch (indicator is at #3) Power On indicator
Input designators
44811
2. 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, refer to Configurable FLEX
I/O Analog Module Features on page 19.
3. Following the module configuration download for the 1794-IF8IH and 1794-IF8IHNFXT modules, the module begins producing runtime data for the PLC processor.
Following the module configuration download for the 1794-OF8IH module, the module applies configuration data to output channels.
4. If any diagnostics or alarms are generated during normal module operation, the data is returned to the PLC processor.
Physical Features of Your Module
The module label identifies the key-in 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 1794-IF8IH module is shown below.
8 CH HART ISOLATED ANALOG INPUT
IN1IN0 IN2 IN3 IN4
IN5
1794-IF8IH
IN6 IN7
3
PWR

Use Alarms on the Input Modules

Rockwell Automation Publication 1794-UM065D-EN-P - April 2020 15
The 1794-IF8IH and 1794-IF8IHNFXT FLEX I/O modules are capable of generating four alarms:
• Low Alarm
• High Alarm
•Remote Fault
•Local Fault
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
These alarm conditions are described in general terms and as they relate to bits on the FLEX I/O module on the following pages.
Low Alarm
The low alarm notifies you when module input signal moves below the configured low alarm trigger point. If the input signal falls below 0% (4 mA), a Low Alarm is generated.
High Alarm
The high alarm works converse to the low alarm. This feature notifies you when the input signal falls above the configured high alarm trigger point. If the input signal falls above 0% (4 mA), an Underrange Alarm is generated.
Remote Fault Alarm
The remote fault alarm is 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 Fault Enable bit allows the 1794-IF8IH and 1794-IF8IHNFXT modules to work with transmitters like the one described.
Once the alarm is issued, it remains active as long as the input signal value remains above or below 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.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
Programming 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…111.88% (20.1…21.9 mA) on the high end of input signal range
or
• -0.63…-11.88% (3.9…2.1 mA) on the low end of input signal range.
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.

Use the HART Capabilities

Once the alarm is issued, it remains active as long as the input signal value remains in the programmed range.
• 112.50% (22 mA) or higher on the high end of input signal range. This value indicates a short in the loop.
or
• -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.
Before using the HART capabilities, be sure that:
• the I/O module and the associated field device are working properly in the analog 4…20 mA mode.
• the I/O module is configured for 4…20 mA range.
• the field device is HART capable.
• no multiple HART field device is connected to each channel.
• input filtering is set to a valid (defined) value.
Rockwell Automation Publication 1794-UM065D-EN-P - April 2020 17
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Processor
User program
Adapter FLEX I/O
HART module
HART Field Device
Command
Response
for example, HART Command 3)
Flexbus
4…20 mA with HART signal

HART Implementation Overview

The FLEX I/O 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 processor. The controlling processor gets its command from the user program, storing the responses in its memory.

Chapter Summary

In this chapter, you learned about FLEX I/O analog I/O modules and HART module capabilities. Read the next chapter to learn about configurable features on your module.
18 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
Chapter
IMPORTANT
Configurable FLEX I/O Analog Module Features
2

Overview

Read this chapter to familiarize yourself with configurable features on the input and output analog modules.
Topic Page
Select Your Analog Input Module Operating Features 20
Select Your Analog Output Module Operating Features 21
Understand Image Table Mapping and Bit/Word Descriptions 24
Chapter Summary 25
HART configurable features described in this chapter include the following
1794-IF8IH and 1794-IF8IHNFXT Input Modules
Fault Mode Output Enable
High Low Error Level Module Fault State Mode
Input Filter Cutoff Local Fault Mode
Data Format Data Format
1794-OF8IH Output Module
Global Reset
Analog Fault State
Latch Retry Mode
Fault Alarm
You must use the I/O configuration portion of your PLC programming software to select and configure these features for 1794-IF8IH and 1794-OF8IH modules. This manual assumes familiarity with the programming software. A brief description of each module feature is provided here.
To learn more about configuration for the 1794-IF8IH and 1794-OF8IH modules, see the following:
Configuration on page 39
Use the 1794-IF8IH Module with the Generic Profile on page 137
Use the 1794-OF8IH Module with the Generic Profile on page 177
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
IMPORTANT
IMPORTANT
Configuration for the 1794-IF8IHNFXT module is done through Logix Designer software version 24. See Edit Your 1794-IF8IHNFXT
Configuration with Studio 5000 Logix Designer (Full Profile) on page 90.
See Use the 1794-IF8IHNFXT with the Generic and Thin Profiles on page
153 if you are using RSLogix 5000® version 23 or earlier.

Select Your Analog Input Module Operating Features

All features of the 1794-IF8IH and the 1794-IF8IHNFXT analog input modules are independently configurable.
The default selection value for all parameters is 0.
Fault Enable
Your input modules are capable of indicating various fault conditions, depending on the input signal value. Use the Fault Enable feature to enable or disable two alarms:
• Remote Fault Alarm
•Local Fault Mode
Use your programming software to set the Fault Enable bit to 0 to disable these alarms. Set the bit to 1 to enable them.
Fault Enable will only enable or disable the Remote and Local Fault alarms. It does not affect the Underrange and Overrange alarms. They are always active.
For more information, see Remote Fault Alarm
Alarm on page 17.
Sample Filter Frequency Rates
Six available input filter settings for the 1794-IF8IH module and seven input filter settings for the 1794-IF8IHNFXT module allow you to choose the best rolloff frequency for input channels on your I/O module. When choosing a filter, remember that time filter selection affects your input signal’s accuracy.
For example, if you choose the highest frequency of 470 Hz (filter 0) for the 1794-IF8IH module, signal noise is more likely to affect the reading, but the slowest frequency of 4.17 Hz (filter 5) provides the most accurate signal due to
20 Rockwell Automation Publication 1794-UM065D-EN-P - April 2020
on page 16 and Local Fault
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
IMPORTANT
incoming noise filtering. It is recommended that you use 62 Hz when HART is enabled to get more accurate signals due to incoming noise.
See the Input Filter Frequency table to decide which input filter to use in your FLEX I/O analog I/O application:
Input Filter Frequency for the 1794-IF8IH Module
01234567
470 Hz 62 Hz 19.6 Hz 16.7 Hz 10 Hz 4.17 Hz n/a n/a
Input Filter Frequency for the 1794-IF8IHNFNXT Module
01234567
242 Hz 123 Hz 62 Hz 19.6 Hz 16.7 Hz 10 Hz 4.17 Hz n/a
(1)
To configure input filter frequency and other module features for 1794-IF8IHNFXT module in Studio 5000 Logix Designer see 1794-IF8IHNFXT Configuration Data Table on page 43
(1)
.
Choose the best input filter cutoff in your programming software.
Data Formats
You must choose a module data format in your user program. Six data formats are available for the 1794-IF8IH module, and seven data formats for the 1794-IF8IHNFXT module.
Default format is 0
The data format selected interprets input readings and returns them to the PLC.
See the Data Format (Configuration Words 2, 3 – bits 0…3, 4…7, 8…11, 12…15)
on page 49 for Data Format tables and a more detailed description of data
formats for the 1794-IF8IH and 1794-IF8IHNFXT modules.
…20 mA.

Select Your Analog Output Module Operating Features

Rockwell Automation Publication 1794-UM065D-EN-P - April 2020 21
To configure data formats and other module features for 1794-IF8IHNFXT module in Logix Designer, see 1794-IF8IHNFXT Channel Data Formats on
page 51.
All features of the 1794-OF8IH analog output module are independently configurable.
The default selection value for all parameters is 0.
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Local Fault Mode
The Local Fault Mode can be programmed to determine how the module responds to communications faults and internal module faults.
When setting the Local Fault Mode feature in your programming software, set this feature’s bit to 0 to use the analog fault state or digital fault state only if a communications fault occurs. Set the bit to 1 to use the Analog Fault state or Digital Fault state if any fault occurs.
Analog fault state and digital fault state determine how the module reacts to faults when a channel is used in analog mode or digital mode, respectively.
Latch Mode
Latch Mode determines channel operation under wire-off or lead-break fault conditions. This feature is available for each channel. Channel detection occurs on a continuous basis. If a fault is detected, the channel fault alarm is set.
If Latch mode is enabled when a fault occurs, the fault will remain latched in its fault state until a Global Reset is issued. If Latch mode is disabled when a fault occurs, the channel reports a fault until the fault is corrected. Global Reset is not necessary if Latch mode is disabled.
When using your programming software, set the Latch mode bit to 0 to disable the feature. Set the bit to 1 to enable it.
Global Reset
Global Reset works in conjunction with Latch mode during fault conditions. If Latch mode is enabled and a fault condition occurs, the channel operating with a fault remains in this condition (with analog or digital fault state implied) until a Global Reset is issued. The Global Reset feature resets all outputs of a particular channel group to accept normal system output data.
The Global Reset feature is an edge triggered signal. Use your programming software to set the Global Reset bit to 1 for normal operation. Resetting of outputs occurs during the 1...0 transition.
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FLEX I/O Isolated Input/Output HART Analog Modules User Manual
Diagnostic Data error 11 = data out of range
Diagnostic Data error 11 = data out of range
04812162024
Output mA
Datatable
20.000
16.000
12.000
8.000
4.000
0.000
-4.000
Data Format
You must choose a module data format in your user program. See 1794-OF8IH
Data Formats on page 77 for an explanation of each bit. Data Formats 2, 5, 6, 8, 9,
10, 11, 12, 13 and 15 are not assigned.
When choosing a data format, remember the following:
• If an unassigned Analog Data Format is selected, the module sets Diagnostic Data to 2 for configuration failure and puts affected channels in the corresponding fault state.
• An unconfigured module channel can be assumed to have the default configuration Analog Data Format 0, 0...20 mA and Analog Mode Fault State minimum range. If a non-assigned format is selected, then the diagnostic 2 for configuration failure is set and the module channel goes to the default fault state minimum range.
• If on the other hand, the configuration had been changed, from the default, and then it was changed again to a non-assigned format, then the diagnostic bit 2 for configuration failure is set and the module goes to the fault state for the last valid configuration.
• Formats 13 and 14 are 2’s complement data formats, and require data to the module in that form.
• Range: 0…15
•Default: 0
• Data Table Reference: data format, word 12 and 13, bits 0…3, bits 4…7
If the data is sent to the module, which is out of range, the value will be clipped and Diagnostic Data will be set to 11 data out of range.
Example of Analog Format 14 and Data Clipping Performance.
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For data format tables and a more detailed description of the data formats for the 1794-OF8IH module, see Data Format (Configuration Words 2, 3 – bits 0…3,
4…7, 8…10, 12…15) on page 76.
Fault Alarm
Fault Alarm selects whether the channel fault detection is enabled or disabled. There is a 100 Hz (10 ms) filter for wire off or lead break detection.
Use your programming software to set the Fault Alarm. Set the feature bit to 0 to disable the alarm. Set the bit to 1 to enable wire off/lead break fault detection.
Understand Image Table
All Allen-Bradley FLEX I/O modules have a sixteen word table of Real Time Data (RTD) to be transferred between the controller and the I/O module. Not
Mapping and Bit/Word
all 16 words need be allocated.
Descriptions
1794-IF8IH Analog Data Table
Word Bit
1514131211109876543210
0 Channel 0 Input Data 1 Channel 1 Input Data 2 Channel 2 Input Data 3 Channel 3 Input Data 4 Channel 4 Input Data 5 Channel 5 Input Data 6 Channel 6 Input Data 7 Channel 7 Input Data 8 H7H6H5H4H3H2H1H0L7L6L5L4L3L2L1L0 9 R7 R6 R5R4 R3R2R1R0P7P6P5P4P3P2 P1P0 10 Reserved Diagnostic Status 11 C7 C6 C5 C4 C3 C2 C1 C0 F7 F6 F5 F4 F3 F2 F1 F0 12 X7 X6 X5 X4 X3 X2 X1 X0 Reserved Where: Hn: Channel n High Alarm
Ln: Channel n Low Alarm Pn: Channel n Out Of Range Alarm Rn: Channel n Second (Remote) Alarm Fn: Channel n HART Failure Cn: Channel n HART Current Fault Xn: Channel n HART Transmitter Present
0: False 1: True
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1794-IF8IHNFXT Analog Data Table
Word Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 Channel 0 Input Data 1 Channel 1 Input Data 2 Channel 2 Input Data 3 Channel 3 Input Data 4 Channel 4 Input Data 5 Channel 5 Input Data 6 Channel 6 Input Data 7 Channel 7 Input Data 8 H7 H6H5H4H3H2H1H0L7L6 L5 L4 L3L2 L1 L0 9 R7 R6R5R4R3R2R1R0P7P6 P5P4P3P2 P1P0 10
11 C7 C6 C5 C4 C3 C2 C1 C0 F7 F6 F5 F4 F3 F2 F1 F0 Where: Hn: Channel n High Alarm
(1)
X7
X6 X5 X4 X3 X2 X1 X0 Diagnostic Status
Ln: Channel n Low Alarm Pn: Channel n Out Of Range Alarm Rn: Channel n Second (Remote) Alarm Fn: Channel n HART Failure Cn: Channel n HART Current Fault Xn: Channel n HART Transmitter Present
0: False 1: True
(1)
When Xn is set, a device is connected and a has a valid device information Data-Set™ available. This bit will clear if the channel is inhibited, the device is removed, or the device is faulted, and will not be set again until a complete device information set is successfully regathered. Words S:0…S:3 are input data classified as Status Words but in RSLogix™ generic profile, these words are shown as tags I:8…I:11.
1794-IF8IHNFXT Output Analog Data Table
Word Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 R R R R R R R R HO7 HO6 HO5 HO4 HO3 HO2 HO1 HO0 Where: HOn: Channel n HART Off Dynamic Control bit
0: False 1: True

Chapter Summary

In this chapter, we told you about the FLEX I/O system and the analog I/O modules, and how they communicate with programmable controllers. Move on to the next chapter to learn how to install your FLEX I/O analog module.
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Notes:
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Chapter
Install Your FLEX I/O Analog Modules
3

Overview

Before You Install Your Analog Module

Read this chapter to install the input and output analog modules.
Topic Page
Before You Install Your Analog Module 27
Removal and Insertion Under Power 27
Install the Module 28
Wire the Terminal Base Units 34
Connect Wiring to the FLEX I/O HART Analog Modules 34
Ground the Module 38
Chapter Summary 38
Before installing your FLEX I/O analog module:
You Need To As Described Under
Verify that the module will be installed in a suitable enclosure
Position the keyswitch on the terminal base Install the Module on page 28
Removal and Insertion Under Power page 27
on
ATTENTION: These modules do not receive primary operational power from the backplane. +V and -V DC power must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.

Removal and Insertion Under Power

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WARNING: These modules are designed so you can remove and insert them under power. However, take special care when removing or inserting these modules in an active process. I/O attached to any module being removed or inserted can change states due to its input/output signal changing conditions. If you insert or remove the terminal base 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.
FLEX I/O Isolated Input/Output HART Analog Modules User Manual
WARNING: When used in a class I, division 2, hazardous location, this equipment must be mounted in a suitable enclosure with proper wiring method that complies with the governing electrical codes.

Install the Module

Installation of the module consists of the following:
•Mounting the terminal base unit.
• Installing the analog I/O module into the terminal base unit.
• Installing the connecting wiring to the terminal base unit.
If you are installing your module into a terminal base unit that is already installed, proceed to page 32.
ATTENTION: Do not use the unused terminals on the terminal base unit. Using the terminals as supporting terminals can result in damage to modules and/or unintended operation of your system.
Mount on a DIN Rail
ATTENTION: Do not remove or replace a terminal base unit when
power is applied. Interruption of the Flexbus can result in unintended operation or machine motion.
Install the Terminal Base Unit
1. Remove the cover plug in the male connector of the unit to which you are connecting this terminal base unit.
2. Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.
3. Verify that the female Flexbus connector is fully retracted into the base unit.
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A
A
41106
41107
4. Position the terminal base at a slight angle and hooked over the top of the 35 x 7.5 mm DIN rail A (Allen-Bradley part number 199-DR1)
5. Slide the terminal base over tight against the adapter (or proceeding terminal base). Make sure the hook on the terminal base slides under the edge of the adapter (or proceeding terminal base) and the Flexbus connector is fully retracted.
ATTENTION: Do not force the terminal base into the adjacent modules. Forcing the units together can bend or break the hook and allow the units to separate and break communication over the backplane.
6. Rotate the terminal base onto the DIN rail with the top of the rail hooked under the lip on the rear of the terminal base.
Use caution to make sure that the female Flexbus connector does not strike any of the pins in the mating male connector.
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41108
41109
7. Press down on the terminal base unit to lock the terminal base on the DIN rail. If the terminal base does not lock into place, use a screwdriver or similar device to open the locking tab, press down on the terminal base until flush with the DIN rail and release the locking tab to lock the base in place.
Gently push the Flexbus connector into the side of the adapter (or proceeding terminal base) to complete the backplane connection.
8. For specific wiring information, see the installation instructions for the module you are installing in this terminal base unit. Terminal assignments are also given later in this chapter, see page 34.
9. Repeat the above steps to install the next terminal base unit. Be sure the Flexbus connector cover on the last terminal base unit is in place.
Mount on a Panel or Wall
Installation of a FLEX I/O system on a wall or panel consists of:
• laying out the drilling points on the wall or panel.
• drilling the pilot holes for the mounting screws.
• mounting the adapter mounting plate.
• installing the terminal base units and securing them to the wall or panel.
If you are installing your module into a terminal base unit that is already installed, proceed to Mount the Analog Modules on the Terminal Base Unit on page 32.
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