Rockwell Automation 1794-OF8IH User Manual
FLEX I/O Isolated Input/Output HART
Analog Modules
Catalog Numbers 1794-IF8IH and1794-OF8IH
User Manual
Important User Information
WARNING
IMPORTANT
ATTENTION
SHOCK HAZARD
BURN HAZARD
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
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, when necessary, we use notes to make you aware of safety considerations.
available from your local Rockwell Automation sales office or online at
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, and recognize the consequence.
Labels may be on or inside the equipment, such as a drive or motor, to alert people that dangerous voltage may be present.
Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous
temperatures.
Allen-Bradley, Rockwell Automation, FLEX I/O, RSLogix, RSLinx, RSLogix 5000 and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
Summary of Changes
This manual contains new and updated information. Changes throughout this
revision are marked by change bars, as shown to the right of this paragraph.
New and Updated Information
This table contains the changes made to this revision.
Topic Page
Overview 1
Communicate with Programmable Controllers 2
Events Following Power-up 2
Use Alarms on the Input Module 3
Remote Fault Alarm 4
Programming the Remote Fault Alarm 5
Configurable FLEX I/O Analog Module Features 7
Data Format 9
Install the Terminal Base Unit 16
Mount the Analog Modules on the Terminal Base Unit 21
Connections for the 1794-IF8IH HART Analog Input Module
on a 1794-TB3 Terminal Base Unit
Connections for the 1794-OF8IH HART Analog Output Module
on a 1794-TB3 or 1794-TB3S Terminal Base Unit
Ground the Module 24
About the ControlNet and EtherNet Adapters 26
Communication Over the FLEX I/O Backplane 26
I/O Structure 28
23
24
Fault State Data 28
Data Transfer Types 31
Interpret the Status Indicators 57
Use the 1794-IF8IH Module with the Generic Profile 119
Use the 1794-OF8IH Module with the Generic Profile 133
Publication 1794-UM065B-EN-E - September 2010
iv Summary of Changes
Notes:
Publication 1794-UM065B-EN-E - September 2010
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 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 as the input module
• 1794-OF8IH as the output module
Related Documentation
The following documents contain additional information concerning Rockwell
Automation products. To obtain a copy, contact your local
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 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.
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 sequential steps or hierarchical information.
• Italic type is used for emphasis.
v Publication 1794-UM065B-EN-E - September 2010
vi Preface
Notes:
Publication 1794-UM065B-EN-E - September 2010
Table of Contents
Summary of Changes
About the FLEX I/O HART Analog
Module
Configurable FLEX I/O Analog
Module Features
Install Your FLEX I/O Analog
Modules
New and Updated Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Why Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Common Techniques Used in this Manual. . . . . . . . . . . . . . . . . . . . . . . v
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What FLEX I/O Analog Modules Do . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Communicate with Programmable Controllers . . . . . . . . . . . . . . . . . . . 2
Events Following Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Physical Features of Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Use Alarms on the Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Remote Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Local Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Use the HART Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HART Implementation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Select Your Analog Input Module Operating Features . . . . . . . . . . . . . 8
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Select Your Analog Output Module Operating Features. . . . . . . . . . . 10
Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Latch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Global Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Understand Image Table Mapping and Bit/Word Descriptions . . . . . 13
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Before You Install Your Analog Module . . . . . . . . . . . . . . . . . . . . . . . 15
Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Mount on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Mount on a Panel or Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mount the Analog Modules on the Terminal Base Unit . . . . . . . . 21
The HART analog input and output modules mounts
on a 1794-TB3 or 1794-TB3S terminal base unit. . . . . . . . . . . . . . 21
Wire the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connect Wiring to the FLEX I/O HART Analog Modules . . . . . . . . 22
Connections for the 1794-IF8IH HART Analog Input Module
on a 1794-TB3 Terminal Base Unit . . . . . . . . . . . . . . . . . . . . . . . 23
i Publication 1794-UM065B-EN-E - September 2010
ii Table of Contents
Input, Output and Configuration of
the FLEX I/O HART Analog I/O
Modules
1794-IF8IH and 1794-OF8IH
Configuration
Connections for the 1794-OF8IH HART Analog Output Module
on a 1794-TB3 or 1794-TB3S Terminal Base Unit . . . . . . . . . . . . 24
Ground the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Use Programming Software in Your FLEX I/O Application. . . . . . . 25
About the ControlNet and EtherNet Adapters . . . . . . . . . . . . . . . . . . 26
Communication Over the FLEX I/O Backplane . . . . . . . . . . . . . . . . 26
Scheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Unscheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fault State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Idle State Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Data Transfer Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Fault Mode (8 of 1 bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input Filter Cutoff (8 of 3 bits). . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
ADC Conversion Rate, Channel Update Time and Repeatability. 39
Data Format (8 of 4 bits). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Remote Low Low Alarm Limit (8 of 16 bit) . . . . . . . . . . . . . . . . . 41
Remote High High Alarm Limit (8 of 16 bit). . . . . . . . . . . . . . . . . 42
Low Alarm Limit (8 of 16 bit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
High Alarm Limit (8 of 16 Bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
HART Disable Channel 0 to 7 (8 of 1 bit). . . . . . . . . . . . . . . . . . . 43
HART Current Fault Limit (8 of 5 bits) . . . . . . . . . . . . . . . . . . . . . 43
Command 3 Disable (8 of 1 bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Real Time Data (RTD) Profile, Primary Input Parameters . . . . . . . . . 45
Primary Input Data (8 of 16 bits each) . . . . . . . . . . . . . . . . . . . . . . 45
Real Time Data (RTD) Profile, Primary Status Parameters. . . . . . . . . 46
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
High Alarm (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Low Alarm (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Remote Alarm (8 of 1 bit each). . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Loop Alarm (8 of 1 bit each). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Module Diagnostic Status (1 of 8 bits) . . . . . . . . . . . . . . . . . . . . . . 49
HART Status Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
HART Failure (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
HART Current Fault (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . 52
HART Transmitter List (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . 52
Secondary Input Data Table, Cyclic EDT Input Data. . . . . . . . . . . . . 52
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Table of Contents iii
HART Command 3 Communication Status (8 of 1 bits): . . . . . . . 53
HART Field Device Command and Communication
Status (8 of 8 bits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
HART Field Device Status (8 of 8 bits) . . . . . . . . . . . . . . . . . . . . . 54
HART Loop Status (8 of 8 bits):. . . . . . . . . . . . . . . . . . . . . . . . . . . 55
HART PV Status (8 of 8 bits): . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Primary HART Variable (8 of 32 bits):. . . . . . . . . . . . . . . . . . . . . . 56
Secondary HART Variable (8 of 32 bits):. . . . . . . . . . . . . . . . . . . . 56
Third HART Variable (8 of 32 bits):. . . . . . . . . . . . . . . . . . . . . . . . 56
Fourth HART Variable (8 of 32 bits): . . . . . . . . . . . . . . . . . . . . . . 56
Primary HART Variable Units Code (8 of 8 bits):. . . . . . . . . . . . . 56
Secondary HART Variable Units Code (8 of 8 bits):. . . . . . . . . . . 56
Third HART Variable Units Code (8 of 8 bits):. . . . . . . . . . . . . . . 57
Fourth HART Variable Units Code (8 of 8 bits): . . . . . . . . . . . . . 57
Interpret the Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Module Configuration for the 1794-OF8IH. . . . . . . . . . . . . . . . . . . . . 57
Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Analog Output Module (1794-OF8IH) . . . . . . . . . . . . . . . . . . . . . 59
Byte Order (2 of 2 bits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Fault Mode (8 of 1 bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Bus Communications and Module Fault Mode (1 of 1 bit). . . . . . 64
HART Disable Channel 0 to 7 (8 of 1 bit). . . . . . . . . . . . . . . . . . . 65
HART Current Fault Limit (8 of 5 bits) . . . . . . . . . . . . . . . . . . . . . 65
Analog Data Format (8 of 4 bits each) . . . . . . . . . . . . . . . . . . . . . . 65
Latch Mode (8 of 1 bit each). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Analog/Digital Output Mode (8 of 1 bit each) . . . . . . . . . . . . . . . 67
Analog Mode Fault State (8 of 2 bits each) . . . . . . . . . . . . . . . . . . 68
Analog Mode Channel Fault State Value (8 of 16 bits each). . . . . 68
Digital Mode Fault State (8 of 1 bit each). . . . . . . . . . . . . . . . . . . . 69
Command 3 Disable (8 of 1 bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Real Time Data (RTD) Profile, Status Parameters . . . . . . . . . . . . . . . . 70
Fault Alarm (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Diagnostic Data (1 of 8 bits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
HART Status Fields. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
HART Current Fault (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . 73
HART Transmitter List (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . 73
Real Time Data (RTD) Profile, Output Parameters. . . . . . . . . . . . . . . 73
Analog Output Data (8 of 16 bits each) . . . . . . . . . . . . . . . . . . . . . 73
Digital Output Data (8 of 1 bit each) . . . . . . . . . . . . . . . . . . . . . . . 73
Global Reset (1 of 1 bit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Fault (1 of 1 bit) and Run/Prog (1 of 1 bit) . . . . . . . . . . . . . . . . . . 74
Secondary Input Data Table, Cyclic EDT Input Data. . . . . . . . . . . . . 75
Secondary Data Table Section Created by the Adapter. . . . . . . . . 75
HART Command 3 Communication Status (8 of 1 bits) . . . . . . . 75
Publication 1794-UM065B-EN-E - September 2010
iv Table of Contents
Configure Module Messaging
Troubleshoot Your Module
FLEX I/O HART Module Commands
Additional HART Protocol
Information
FLEX I/O HART Modules Network
Messaging
Use the 1794-IF8IH Module with
the Generic Profile
Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
HART Configuration Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Pick HART Input Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Enable HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Enable Publishing HART Command 3 Variables . . . . . . . . . . . . . 79
Accessing HART Data Using CIP Message Instruction (MSG) . . 79
Fill in The Information Needed for a MSG Instruction . . . . . . . . 79
Select the Attribute Value for the Operation You Want
to Perform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Retrieve Additional Information About the HART Device . . . . . 81
Get Device Info Block 1 Message . . . . . . . . . . . . . . . . . . . . . . . . . 82
Get Device Info Block 2 Message . . . . . . . . . . . . . . . . . . . . . . . . . 84
Get Device Info Block 3 Message . . . . . . . . . . . . . . . . . . . . . . . . . 85
Reset the Device Info Changed Status Bit Message. . . . . . . . . . . . 87
HART Pass through Message Overview . . . . . . . . . . . . . . . . . . . . 88
Format a HART Pass through Init Request Message . . . . . . . . . . 89
Format a "Get Pass through Message Status" Request . . . . . . . . . 90
HART Failed Reason Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Format a "Read Pass through Reply" Request . . . . . . . . . . . . . . . . 93
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Interpret Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Protocol Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Device-specific Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Message Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Master-slave Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Multiple Master Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Transaction Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Burst Mode (not supported) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
HART Frame Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Byte Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Publication 1794-UM065B-EN-E - September 2010
Use the 1794-OF8IH Module with
the Generic Profile
Index
Table of Contents v
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
HART Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Channel Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Digital Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
High Alarm Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Low Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Remote High High Alarm Limit . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Remote Low Low Alarm Limit. . . . . . . . . . . . . . . . . . . . . . . . . . . 127
HART Command 3 Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Input Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Input Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
High Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Low Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Out of Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Second Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
HART Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
HART Current Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
HART Transmitter Present. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Byte Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Fault Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
HART Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Channel Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Analog Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Digital Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Digital Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Analog Fault Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
HART Command 3 Disable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Digital Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Fault Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Analog Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Module Diagnostic Status (1 of 8 bits) . . . . . . . . . . . . . . . . . . . . . 143
HART Current Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
HART Transmitter Present. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Publication 1794-UM065B-EN-E - September 2010
vi Table of Contents
Notes:
Publication 1794-UM065B-EN-E - September 2010
Chapter
IMPORTANT
1
About the FLEX I/O HART Analog Module
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 1
Communicate with Programmable Controllers 2
Use Alarms on the Input Module 3
Use the HART Capabilities 6
HART Implementation Overview 6
Chapter Summary 6
To use all of the features of this module it must be used with the
1794-ACN(R)15 with version 5.1 firmware or later, or the 1794-AENT
with version 4.2 firmware or later.
For more information about using this module with 1794-ACN(R)15
with version 5.1 (or greater) firmware, see 1794-RN071
.
What FLEX I/O Analog Modules Do
1 Publication 1794-UM065B-EN-E - September 2010
The FLEX I/O HART input and output modules must be used in a
ControlNet or EtherNet network.
The 1794-IF8IH module accepts up to 8 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.
Similarly, the 1794-OF8IH module provides as many as 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:
• local microprocessor intelligence for advanced features.
• full functionality without switches or jumpers.
2 About the FLEX I/O HART Analog Module
• multiple data ranges that can be independently programmed for each
channel.
• lead breakage detection.
• overrange/underrange alarms.
• remote transmitter alarm.
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 Power-up
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.
Publication 1794-UM065B-EN-E - September 2010
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.
3. Following the module configuration download for the 1794-IF8IH
module, 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.
About the FLEX I/O HART Analog Module 3
Module type
Removable label
Keyswitch position
indicator (#3)
Power On indicator
Input designators
44811
Physical Features of Your 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 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 Module
The 1794-IF8IH FLEX I/O 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 I/O module on the following pages. The following graphic
shows at what values these alarms are generated for
4…20 mA 1000/mA range.
Publication 1794-UM065B-EN-E - September 2010
4 About the FLEX I/O HART Analog Module
0 mA 4 mA 20 mA 22 mA
Remote Fault
Remote Fault
Local
Fault
Local
Fault
Underrange Overrange
Programmable
in 20 0.1 mA
steps by Error
Level 0.1 mA
Steps
parameter
-12.50%
0.00%
-25.00%
Programmable
in 20 0.1 mA
steps by Error
Level 0.1 mA
Steps
parameter
100.00% 112.50%
45149
Data Format Alarm Example
In this example, the normal active data range is 4…20 mA. The alarms are
generated in three overlapping bands.
Physical Input Signal Ranges
Publication 1794-UM065B-EN-E - September 2010
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
The underrange alarm works 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.
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.
About the FLEX I/O HART Analog Module 5
IMPORTANT
IMPORTANT
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 module to work with transmitters
like the one just described.
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.
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.
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.
Publication 1794-UM065B-EN-E - September 2010
6 About the FLEX I/O HART Analog Module
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
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.
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 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
Publication 1794-UM065B-EN-E - September 2010
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.
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
Select Your Analog Output Module Operating
Features
Understand Image Table Mapping and Bit/Word
Descriptions
Chapter Summary 14
HART configurable features described in this chapter include the following
Analog/Digital Configurable Features on FLEX I/O Analog I/O Modules
1794-IF8IH Input Module 1794-OF8IH Output Module
Fault Mode Output Enable
High Low Error Level Module Fault State Mode
Input Filter Cutoff Local Fault Mode
Data Format Data Format
8
10
13
Global Reset
7 Publication 1794-UM065B-EN-E - September 2010
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. This manual assumes
familiarity with the programming software. A brief description of
each module feature is provided here. For more information on your
programming software, refer to the software user manual.
8 Configurable FLEX I/O Analog Module Features
IMPORTANT
IMPORTANT
Select Your Analog Input Module Operating Features
All features of the 1794-IF8IH analog input module 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 refer to Remote Fault Alarm and Local Fault Alarm.
Input Filter Cutoff
Six available input filter settings 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), 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 incoming noise filtering.
Refer to the Input Filter Frequency table to decide which input filter to use in
your FLEX I/O analog I/O application:
Input Filter Frequency
01234567
470 Hz 62 Hz 19.6 Hz 16.7 Hz 10 Hz 4.17 Hz n/a n/a
Choose the best input filter cutoff in your programming software.
Publication 1794-UM065B-EN-E - September 2010
Configurable FLEX I/O Analog Module Features 9
input
(
20
)
Datatable = 10000
Datatable = 10000
√
input
20
IF...Square_Root_Threshold
< 10000
√
input
20
Else...datatable = 0
input
(
20
)
Datatable = 65535
input-4
(
16
)
Datatable = 10000
Datatable = 10000
√
IF...Square_Root_Threshold
< 10000
√
Else...datatable = 0
input-4
16
input-4
16
Data Format
You must choose a module data format in your user program. Formats 8, 9, 10
and 15 are not used. If they are selected for a channel quad, a configuration
fault will occur and will be reported as Diagnostic Data 2. All data for that
channel quad will be set to zero (0).
Formats 5, 12, 13 and 14 are 2’s complement data formats, and will return data
in that form.
12 Formats are available
1794-IF8IH Data Formats
Data
Format
0 0…20 mA
1 0…20 mA
2 0…20 mA
3 0…20 mA
4 4…20 mA
5 4…20 mA
Format Resolution Input
as mA
as %
as √%
as unsigned
integer
as mA
as %
0.1 % of
0…20 mA
0.2 % of
0…20 mA
0.19 % of
0…20 mA
0.03 % of
0…20 mA
0.1 % of
4…20 mA
0.16 % of
4…20 mA
Default format is 0
The data format selected interprets input readings and returns them to the
PLC.
Module Data Processing Data Table Value
Range
0…22 mA Datatable = 1000 (input) 0…22000
0…22 mA 0…11000
0…22 mA 0…10488
0…20 mA 0…65535
2…22 mA Datatable = 1000 (input) 2000…22000
2…22 mA -1250…+11250
…20 mA
(Interpretation)
(0…22.000 mA)
(0…110.00%)
(0…104.88%)
(0…22 mA)
(2.000…22.000
mA)
(2’s complement)
(-12.50%…+112.5
0%)
Count
per mA
1000 With
500
524
3276
1000
625 With
Error
Steps
error
steps
error
steps
6 4…20 mA
as √%
0.17 % of
4…20 mA
4…22 mA 0…10607
(0…106.07%)
Publication 1794-UM065B-EN-E - September 2010
With
error
steps,
under-r
ange
not
allowed
10 Configurable FLEX I/O Analog Module Features
input-4
(
16
)
Datatable = 65535
input
(
22
)
Datatable = 55000
input-4
(
16
)
Datatable = 10000
input-4
(
16
)
Datatable = 10000
input-4
(
16
)
Datatable = 10000
IMPORTANT
1794-IF8IH Data Formats
Data
Format
7 4…20 mA
8 Not assigned
9
10
11 0…20 mA
12 4…20 mA
13 4…20mA
14 4…20 mA
15 Not assigned
Format Resolution Input
as unsigned
integer
as A/D
count
as %
as %
as %
0.03% of
4…20 mA
0.04% of
0…20 mA
0.16% of
4…20 mA
0.16% of
4…20 mA
0.16% of
4…20 mA
Module Data Processing Data Table Value
Range
0…22 mA 0…55000
3.6…21 mA -250 … +10625
3…21 mA -625 … +10625
2…22 mA -1250 … +11250
(Interpretation)
0…65535
(4…20 mA)
(0…22 mA)
(2’s complement)
(-2.50…+106.25%)
(2’s complement)
(-6.25…+106.25%)
(2’s complement)
(-12.50…+112.50
%)
Count
per mA
4095 With
2500 All
625 NAMU
Error
Steps
error
steps
fixed
R NE 4
all fixed
All
fixed
Select Your Analog Output Module Operating Features
All features of the 1794-OF8IH analog output module are independently
configurable.
The default selection value for all parameters is 0.
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.
Publication 1794-UM065B-EN-E - September 2010
Configurable FLEX I/O Analog Module Features 11
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 (see below) 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 to 0 transition.
Data Format
You must choose a module data format in your user program. Refer to
1794-OF8IH Data Formats 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 to 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.
Publication 1794-UM065B-EN-E - September 2010
12 Configurable FLEX I/O Analog Module Features
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
Output =
datatable
(
1000
)
Output = 20
datatable
(
10000
)
Output = 20
datatable
(
65535
)
• 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 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.
1794-OF8IH Data Formats
Data
Format
0mA as
1 % as
2 0…20 mA — 0…22 mA Not Assigned
3 Unsigned
Publication 1794-UM065B-EN-E - September 2010
Format Resolution Full
Output
Range
0…20 mA
0…20 mA
integer as
0…20 mA
0.1% of
0…20 mA
0.2% of
0…20 mA
0.03% of
0…20 mA
0…22 mA 0…22000
0…22 mA 0…11000
0…20 mA 0…65535
Module Data Processing Data Table Value
(Interpretation)
(0…22.000 mA)
(0…110.00%)
(0…20 mA)
Count per
mA/
Resolution
1000/
1.0 µA
500/
2.0 µA
3276/
0.305 µA
Analog Fault
State
Min=0 mA
Max=22 mA
hold
Last=hold
FS value
Min=0 mA
Max=22 mA
hold
Last=hold
FS value
Min=0 mA
Max=20 mA
hold
Last=hold
FS value
1794-OF8IH Data Formats
Output =
datatable
(
1000
)
Output = 16
datatable
(
65535
)
+ 4
Output = 16
datatable
(
10000
)
+ 4
Configurable FLEX I/O Analog Module Features 13
Data
Format
4mA as
5 4…20 mA — 4…20 mA Not assigned
6 4…20 mA 4…20 mA Not assigned
7 Unsigned
8 0…20 mA 0…20 mA Not assigned
9 0…20 mA 0…20 mA Not assigned
10 0…20 mA 0…20 mA Not assigned
11 0…20 mA 0…20 mA Not assigned
12 4…20 mA Not assigned
13 4…20 mA Not assigned
14 % as
15 4…20 mA 4…20 mA Not assigned
Format Resolution Full
Output
Range
4…20 mA
integer as
4…20 mA
4…20 mA
0.1% of
4…20 mA
0.03% of
4…20 mA
0.16% of
4…20 mA
2…22 mA 2000…22000
4…20 mA 0…65535
2…22 mA -1250 … +11250
Module Data Processing Data Table Value
(Interpretation)
(2.000…22.000 mA)
(4…20 mA)
(2’s complement)
(-12.50% …
+112.50%)
Count per
mA/
Resolution
1000/
1.0 µA
4095/
0.244 µA
625/
1.6 µA
Analog Fault
State
Min=2 mA
Max=22 mA
hold
Last=hold
FS value
Min=4 mA
Max=20 mA
hold
Last=hold
FS value
Min=2 mA
Max=22 mA
hold
Last=hold
FS value
Understand Image Table Mapping and Bit/Word Descriptions
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.
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.
Publication 1794-UM065B-EN-E - September 2010
14 Configurable FLEX I/O Analog Module Features
Not all 16 words need be allocated. The 1794-IF8IH has the following RTD
I/O Profile:
1794-IF8IH RTD I/O Profile
RTD Index Assembly Index Assembly
RTD 0 MSW Module Status Word
RTD 1 EDT Read Word EDT Read Word
RTD 2…9 I:0…I:7 RTD Input Data
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 R6R5R4R3R2R1R0P7P6P5P4P3P2P1P0
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
Chapter Summary
Publication 1794-UM065B-EN-E - September 2010
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.
Chapter
ATTENTION
WARNING
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 15
Removal and Insertion Under Power 15
Install the Module 16
Wire the Terminal Base Units 22
Connect Wiring to the FLEX I/O HART Analog Modules 22
Ground the Module 24
Chapter Summary 24
Before installing your FLEX I/O analog module:
Steps to Complete Before Installation
You Need To As Descibed Under
Verify that the module will be installed in a
suitable enclosure
Position the keyswitch on the terminal base Install the Module, page 18
Removal and Insertion Under Power,
page 17
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
15 Publication 1794-UM065B-EN-E - September 2010
These module 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.
16 Install Your FLEX I/O Analog Modules
WARNING
ATTENTION
ATTENTION
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 21.
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
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. Make certain that the female flexbus connector is fully retracted into
the base unit.
Publication 1794-UM065B-EN-E - September 2010
Install Your FLEX I/O Analog Modules 17
ATTENTION
A
A
41106
41107
4. Position the terminal base at a slight angle and hooked over the top of
the 35 x 7.5mm 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.
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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18 Install Your FLEX I/O Analog Modules
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, refer to 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 22.
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 21.
Publication 1794-UM065B-EN-E - September 2010
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