Allen-Bradley 1794-IE8H User manual

FLEX I/O HART
Analog Modules
1794-IE8H and 1794-OE8H
User Manual

Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication SGI-1.1 available from your local
Rockwell Automation sales office or online at
http://www.literature.rockwellautomation.com) describes some important differences
between solid state equipment and hard-wired electromechanical devices. Because of
this difference, and also because of the wide variety of uses for solid state equipment,
all persons responsible for applying this equipment must satisfy themselves that each
intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular
installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written
permission of Rockwell Automation, Inc., is prohibited.
Throughout this manual we may 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.
IMPORTANT Identifies information that is critical for successful application and
understanding of the product.
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
•recognize the consequence
SHOCK HAZARD Labels may be located on or inside the equipment to alert people that
dangerous voltage may be present.
BURN HAZARD Labels may be located on or inside the equipment to alert people that
surfaces may be dangerous temperatures.

ATTENTION Environment and Enclosure
This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in IEC
publication 60664-1), at altitudes up to 2000 meters without derating.
This equipment is considered Group 1, Class A industrial equipment
according to IEC/CISPR Publication 11. Without appropriate
precautions, there may be potential difficulties ensuring
electromagnetic compatibility in other environments due to
conducted as well as radiated disturbance.
This equipment is supplied as open-type equipment. It must be
mounted within an enclosure that is suitably designed for those
specific environmental conditions that will be present and
appropriately designed to prevent personal injury resulting from
accessibility to live parts. The interior of the enclosure must be
accessible only by the use of a tool. Subsequent sections of this
publication may contain additional information regarding specific
enclosure type ratings that are required to comply with certain
product safety certifications.
See NEMA Standards publication 250 and IEC publication 60529, as
applicable, for explanations of the degrees of protection provided by
different types of enclosure. Also, see the appropriate sections in this
publication, as well as Industrial Automation Wiring and Grounding
Guidelines, Allen-Bradley publication 1770-4.1, for additional
installation requirements pertaining to this equipment.
WARNING If you insert or remove the module while backplane power is on, an
electrical arc can occur. This could cause an explosion in hazardous
location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
WARNING If you connect or disconnect wiring while the field side power is on, an
electrical arc can occur. This could cause an explosion in hazardous
location installations.
Be sure that power is removed or the area is nonhazardous before
proceeding.
ATTENTION This product is grounded through the DIN rail to chassis ground. Use
zinc plated yellow-chromate steel DIN rail to assure proper grounding.
The use of other DIN rail materials (such as aluminum or plastic) that
can corrode, oxidize, or are poor conductors, can result in improper or
intermittent grounding.
ATTENTION Prevent Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause
internal damage and affect normal operation. Follow these guidelines
when you handle this equipment:
•Touch a grounded object to discharge potential static.
•Wear an approved grounding wriststrap.
•Do not touch connectors or pins on component boards.
•Do not touch circuit components inside the equipment.
•Use a static-safe workstation, if available.
•Store the equipment in appropriate static-safe packaging when not
in use.

North American Hazardous Location Approval
.
The following information applies
when operating this equipment in
hazardous locations:
Informations sur l’utilisation de cet
équipement en environnements
dangereux :
Products marked CL I, DIV 2, GP A, B, C, D
are suitable for use in Class I Division 2
Groups A, B, C, D, hazardous locations and
nonhazardous locations only. Each product
is supplied with markings on the rating
nameplate indicating the hazardous
location temperature code. When
combining products within a system, the
most adverse temperature code (lowest “T”
number) may be used to help determine the
overall temperature code of the system.
Combinations of equipment in your system
are subject to investigation by the local
Authority Having Jurisdiction at the time of
installation.
Les produits marqués CL I, DIV 2, GP A, B, C, D
ne conviennent qu’à une utilisation en
environnements de Classe I Division 2 Groupes
A, B, C, D dangereux et non dangereux. Chaque
produit est livré avec des marquages sur sa
plaque d’identification qui indiquent le code de
température pour les environnements
dangereux. Lorsque plusieurs produits sont
combinés dans un système, le code de
température le plus défavorable (code de
température le plus faible) peut être utilisé
pour déterminer le code de température global
du système. Les combinaisons d’équipements
dans le système sont sujettes à inspection par
les autorités locales qualifiées au moment de
l’installation.
EXPLOSION HAZARD
•Do not disconnect
equipment unless power
has been removed or the
area is known to be
nonhazardous.
•Do not disconnect
connections to this
equipment unless power
has been removed or the
area is known to be
nonhazardous. Secure
any external
connections that mate to
this equipment by using
screws, sliding latches,
threaded connectors, or
other means provided
with this product.
•Substitution of
components may impair
suitability for Class I,
Division 2.
•If this product contains
batteries, they must only
be changed in an area
known to be
nonhazardous.
RISQUE D’EXPLOSION
•Couper le courant ou
s’assurer que
l’environnement est classé
non dangereux avant de
débrancher l'équipement.
•Couper le courant ou
s'assurer que
l’environnement est classé
non dangereux avant de
débrancher les
connecteurs. Fixer tous les
connecteurs externes
reliés à cet équipement à
l'aide de vis, loquets
coulissants, connecteurs
filetés ou autres moyens
fournis avec ce produit.
•La substitution de
composants peut rendre
cet équipement inadapté à
une utilisation en
environnement de Classe I,
Division 2.
•S’assurer que
l’environnement est classé
non dangereux avant de
changer les piles.
WARNING AVERTISSEMENT

European Hazardous Location Approval
European Zone 2 Certification
(The following applies when the product bears the EEx Marking.)
This equipment is intended for use in potentially explosive atmospheres as defined
by European Union Directive 94/9/EC and has been found to comply with the
Essential Health and Safety Requirements relating to the design and construction
of Category 3 equipment intended for use in potentially explosive atmospheres,
given in Annex II to this Directive.
Compliance with the Essential Health and Safety Requirements has been assured
by compliance with EN 60079-15.
IMPORTANT Observe the following additional Zone 2 certification
requirements.
•This equipment is not resistant to sunlight or other sources
of UV radiation.
•The secondary of a current transformer shall not be
open-circuited when applied in Class I, Zone 2 environments.
•Equipment of lesser Enclosure Type Rating must be installed
in an enclosure providing at least IP54 protection when
applied in Class I, Zone 2 environments.
•This equipment shall be used within its specified ratings
defined by Allen-Bradley.
•Provision shall be made to prevent the rated voltage from
being exceeded by transient disturbances of more than 40%
when applied in Class I, Zone 2 environments

1Publication 1794-UM063A-EN-P - March 2006
Table of Contents
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
North American Hazardous Location Approval . . . . . . . . . . . . . 1-4
European Hazardous Location Approval. . . . . . . . . . . . . . . . . . . 1-5
Preface Why Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Who Should Read This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
What This Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
For Additional Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2
Table of Contents
Chapter 1
About the FLEX I/O HART Analog
Modules
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
What the FLEX I/O Analog I/O Modules Do. . . . . . . . . . . . . . . . . 1-1
How FLEX I/O Analog Modules Communicate with Programmable
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Events Following Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Physical Features of Your Analog I/O Module . . . . . . . . . . . . . . . . . 1-3
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Use Alarms on the 1794-IE8H Module . . . . . . . . . . . . . . . . . . . . . . . 1-3
Data Format Alarm Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Remote Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Local Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
How to Use the HART Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
HART Implementation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Chapter 2
Configurable FLEX I/O Analog
Module Features
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Select Your 1794-IE8H FLEX I/O Analog Input Module’s Operating
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Remote Transmitter Error Up or Down . . . . . . . . . . . . . . . . . . . 2-2
High Low Error Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Input Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Select Your 1794-OE8H FLEX I/O Analog Output Module’s
Operating Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Latch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Global Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Analog Digital State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Analog Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Analog Fault State Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Publication 1794-UM063A-EN-P - March 2006
Table of Contents 2
Digital Fault State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Understand Image Table Mapping and Bit/Word Descriptions . . . 2-12
Bit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Analog Input Module (1794-IE8H) Image Table Mapping. . . . 2-13
Bit/Word Description for the Analog Input Module
(1794-IE8H). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Analog Output Module (1794-OE8H) Image Table Mapping . 2-16
1794-IE8H and -OE8H Extended Configuration Data Table . . . . 2-19
Secondary Master Enable (SME) and Primary Master Inhibit (PMI)
2-20
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Chapter 3
Install Your FLEX I/O Analog
Modules
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Before You Install Your Analog Module . . . . . . . . . . . . . . . . . . . . . . 3-1
Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Mount on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Mount on a Panel or Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Mount the Analog Modules on the Terminal Base Unit . . . . . . . 3-7
Wire the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Connect Wiring to the
FLEX I/O HART Analog Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Connections for the 1794-IE8H HART Analog Input Module on a
1794-TB3G Terminal Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Connections for the 1794-OE8H HART Analog Output Module on
a 1794-TB3G or 1794-TB3GS Terminal Base Unit. . . . . . . . . . 3-11
Ground the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Chapter 4
Input, Output and Configuration
File for the Analog I/O Modules on
the ControlNet Network
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Use Programming Software in Your FLEX I/O Application . . . . . . 4-2
About the ControlNet Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Communication Over the
FLEX I/O Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Scheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Unscheduled Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Adapter Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Fault State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Publication 1794-UM063A-EN-P - March 2006
Table of Contents 3
Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Idle State Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Chapter 5
Calibrate Your Module What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
When and How to Calibrate Your FLEX I/O Analog I/O Module 5-1
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
1794-IE8H Calibration Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
1794-IE8H Calibration Command Structure . . . . . . . . . . . . . . . . . . . 5-3
1794-IE8H Calibration Command Byte. . . . . . . . . . . . . . . . . . . . 5-4
1794-IE8H Calibration Item Byte Channel-Mask . . . . . . . . . . . . 5-8
1794-IE8H Calibration with Offset and Gain . . . . . . . . . . . . . . 5-10
1794-OE8H Calibration Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
1794-OE8H Calibration Command Byte . . . . . . . . . . . . . . . . . . 5-12
1794-OE8H Calibration Item Byte Channel-Mask . . . . . . . . . . 5-17
1794-OE8H Calibration Flowchart Procedure . . . . . . . . . . . . . 5-18
Chapter 6
Troubleshoot the FLEX I/O Analog
I/O Modules
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
1794-IE8H Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
1794-OE8H Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Appendix A
Specifications 1794-IE8H HART Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
1794-OE8H HART Output Module . . . . . . . . . . . . . . . . . . . . . . . . A-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B
FLEX I/O HART Module Commands What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Protocol Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Device-Specific Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Appendix C
Additional HART Protocol
Information
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Message Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Master-slave Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Multiple Master Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Publication 1794-UM063A-EN-P - March 2006
Table of Contents 4
Transaction Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Burst Mode (not supported) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Universal Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Common Practice Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-9
Appendix D
FLEX I/O HART Modules Network
Messaging
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Differences Between Attributes and Assembly Indexes . . . . . . . . . D-3
HART Frame Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6
Appendix E
Configure the 1794-IE8H Module in
RSLogix 5000 Software Over the
ControlNet Network
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Data Format Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
Up/Down Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
High and Low Error Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
Square Root Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Analog Input Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8
Local Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8
Remote Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8
Diagnostic Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-9
Appendix F
Configure the 1794-OE8H Module
in RSLogix5000 Software Over the
ControlNet Network
What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1
Background Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
Data Format Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
Analog Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Latch Retry Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Analog/Digital Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Digital Fault State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Analog Fault State Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
Digital Output Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
Global Output Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
Analog Output Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7

Publication 1794-UM063A-EN-P - March 2006
Table of Contents 5
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
Diagnostic Status Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
HART Rebuild Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8
HART Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8
HART Readback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8
HART Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-9
HART Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-9
Index Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . Back Cover
Installation Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover
New Product Satisfaction Return . . . . . . . . . . . . . . . . . . Back Cover

Publication 1794-UM063A-EN-P - March 2006
Table of Contents 6

1Publication 1794-UM063A-EN-P - March 2006
Preface
Why Read This Manual
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.
Who Should Read This
Manual
You must be able to program and operate a ControlNet product and
ControlNet network to make efficient use of a FLEX I/O module.
About the Vocabulary
In this manual, we refer to the:
•1794-IE8H as the ’input module’
•1794-OE8H as the ’output module’
What This Manual Contains
The following chart lists each chapter with its corresponding title and a brief
overview of the topics covered in that chapter.
Chapter Title Contents
1About the FLEX I/O HART Analog
Modules
Describes module functionality and
physical features
2Configurable FLEX I/O Analog Module
Features
Describes configurable module
features and configuration bits
3Install Your FLEX I/O Analog Modules How to install and wire the modules
4Input, Output and Configuration Files
for the Analog I/O Modules on the
ControlNet Network
Describes how to use these I/O
modules over the ControlNet
network
5Calibrate Your Module Lists the tools needed, and the
methods used to calibrate the
module
6Troubleshoot the FLEX I/O Analog I/O
Modules
How to use the indicators to
troubleshoot your module
Appendix Title Contents
ASpecifications Outlines module specifications and
accuracy
BFLEX I/O HART Module Commands Explains how to program the analog
modules
CAdditional HART Protocol Information Discusses the HART protocol and
provides references for additional
information about the protocol

Publication 1794-UM063A-EN-P - March 2006
Preface 2
For Additional Information
For additional information on FLEX systems and modules, refer to the
following documents.
DFLEX I/O HART Modules Network
Messaging
How to communicate using MSG
and CIO instructions
EConfigure the 1794-IE8H Module in
RSLogix 5000 Software Over the
ControlNet Network
How to configure your input module
using RSLgix 5000.
FConfigure the 1794-OE8H Module in
RSLogix5000 Software Over the
ControlNet Network
How to configure your output
module using RSLgix 5000.
Catalog
Number Voltage Description
Publications
Installation
Instructions
User Manual
1794 1794 FLEX I/O Selection Guide 1794–SG002
1794-ACN 24V dc ControlNet Adapter 1794–IN101
1794-AENT EtherNet/IP Adapter 1794-IN082 ENET-UM001
1794-ACNR 24V dc Redundant Media ControlNet
Adapter
1794–IN101
1794-ACN15 24V dc ControlNet Adapter
1794-IN101
CNET-UM001
1794-ACNR15 24V dc Redundant Media ControlNet
Adapter
CNET-UM001
1794-ADN 24V dc DeviceNet Adapter 1794-IN099 1794–6.5.5
1794-ASB/E 24V dc Remote I/O Adapter 1794–IN098 1794–UM009
1794-ASB2/D 24V dc 2–Slot Remote I/O Adapter 1794–UM059
1794-APB 24V dc Profibus Adapter 1794-IN087 1794–UM057
1794-IB8 24V dc 8 Sink Input Module
1794-IN0931794-IB16 24V dc 16 Sink Input Module
1794-IB32 24V dc 32 Sink Input Module
1794-IV16 24V dc 16 Source Input Module
1794-IN0951794-OV16 24V dc 16 Sink Output Module
1794-OV16P 24V dc 16 Protected Sink Output Module

Publication 1794-UM063A-EN-P - March 2006
Preface 3
1794-OB8 24V dc 8 Source Output Module
1794-IN094
1794-OB8EP 24V dc 8 Electronically Fused Output Module
1794-OB16 24V dc 16 Source Output Module
1794-OB16P 24V dc 16 Protected Source Output Module
1794-OB32P 24V dc 32 Protected Source Output Module
1794-IB10XOB6 24V dc 10 Input/6 Output Module 1794-IN083
1794-IB16XOB16P 24V dc 16 Input/16 Output Module
1794-OW8 24V dc 8 Relay Output Module 1794-IN019
1794-IE8 24V dc Analog 8 Input Module
1794-IN100 1794–6.5.21794-OE4 24V dc Analog 4 Output Module
1794-IE4XOE2 24V dc 4 Input/2 Output Analog Module
1794-OF4I 24V dc 4 Output Isolated Analog Module 1794-IN037
1794–6.5.8
1794-IF4I 24V dc 4 Input Isolated Analog Module 1794-IN038
1794-IF2XOF2I 24V dc 2 Input/2 Output Isolated Analog
Module
1794-IN039
1794-IR8 24V dc 8 RTD Input Analog Module 1794-IN021 1794–6.5.4
1794-IT8 24V dc 8 Thermocouple Input Module 1794–6.5.7
1794-IRT8 24V dc 8 Thermocouple/RTD Input Module 1794-IN050 1794–6.5.12
1794-IJ2 24V dc 2 Channel Frequency Input Module 1794-IN049 1794–6.5.11
1794-ID2 24V dc 2 Channel Frequency Input Module 1794-IN063 1794–6.5.15
1794-IP4 24V dc 2 Channel Pulse Counter Module 1794-IN064 1794–6.5.16
1794-VHSC 24V dc Very High Speed Counter Module 1794IN067 1794–6.5.10
1794-IC16 48V dc 16 Input Module 1794-IN105
1794-OC16 48V dc Output Module
1794-IA8 120V ac 8 Input Module
1794-IN1021794-IA8I 120V ac Isolated 8 Input Module
1794-IA16 120V ac 16 Input Module
1794-OA8 120V ac 8 Output Module
1794-IN1031794-OA8I 120V ac Isolated 8 Output Module
1794-OA16 120V ac 16 Output Module
1794-IM8 220V ac 8 Input Module 1794-IN104
1794-OM8 220V ac 8 Output Module
Catalog
Number Voltage Description
Publications
Installation
Instructions
User Manual

Publication 1794-UM063A-EN-P - March 2006
Preface 4
1794-TB2
1794-TB3
Cage Clamp Terminal Base
Cage Clamp Terminal Base
1794-IN092
1794-TBN Terminal Base Unit
1794-TBNF Fused Terminal Base Unit
1794-TB3T Temperature Terminal Base Unit
1794-TB3S Spring Clamp Terminal Base Unit
1794-TB3TS Spring Clamp Temperature Base Unit
1794-TB3G Terminal Base Unit
1794-TB3GS Spring Clamp Terminal Base Unit
1794-TB32 Cage Clamp Terminal Base Unit
1794-TB32S Spring Clamp Terminal Base Unit
1794-CE1 Extender Cables 1794–5.12
1794-CE3 Extender Cables
1794-NM1 Mounting Kit 1794–5.13
1794-PS13 24V dc Power Supply 1794-IN069
1794-PS3 24V dc Power Supply
FLEX Ex
1797-IBN16 See note 16 NAMUR Digital Input Module 1797-5.7
1797-OB4D See note 4 NI, Ex Source Digital Output
Module
1797-5.6
1797-IE8 See note 8 Input Analog Module
1797-5.5
1797-IE8H See note 8 Input HART Module
1797-IE8NF See note 8 Input Analog Selectable Filter
Module
1797-OE8, See note Analog 8 Output Module 1797-5.3
1797-OE8H See note Analog 8 HART Output Module
1797-IRT8 See note 8 Thermocouple/RTD Input Module 1797-5.4
1797-IJ2 See note 2 Channel Frequency Input Module 1797-5.9
1797-TB3 Flex Ex Terminal Base Units 1797-5.1
1797-TB3S Flex Ex Terminal Base Units
1797-BIC See note I.S. Bus Isolator 1797-5.13
1797-CEC See note FLEX Ex Bus Connector
Note: Intrinsically Safe Voltage
Catalog
Number Voltage Description
Publications
Installation
Instructions
User Manual

1Publication 1794-UM063A-EN-P - March 2006
Chapter 1
About the FLEX I/O HART Analog Modules
What This Chapter Contains
Read this chapter to familiarize yourself with the input and output analog
modules.
What the FLEX I/O Analog
I/O Modules Do
The 1794 HART input and output modules must be used in a ControlNet or
EtherNet network.
The 1794-IE8H module accepts up to 8 analog inputs. The inputs are
nonisolated and will accept current in either of the following two ranges: 4 to
20 mA or 0 to 20 mA. The default input range is 0 to 20 mA. The inputs have
both fixed hardware filters and selectable firmware digital filters.
Similarly, the 1794-OE8H module provides as many as 8 analog outputs. The
outputs are nonisolated and will provide current in either of the following two
ranges: 4 to 20 mA or 0 to 20 mA. The default output range is 0 to 20 mA.
Each module offers:
•local microprocessor intelligence for advanced features.
•full functionality without switches or jumpers.
•multiple data ranges that can be independently programmed
in channel groups.
•lead breakage detection.
•overrange/underrange alarms.
•remote transmitter alarm.
For Information About See Page
What the FLEX I/O Analog I/O
Modules Do
1-1
How FLEX I/O Analog Modules
Communicate with Programmable
Controllers
1-2
Physical Features of Your Analog I/O
Module
1-3
Chapter Summary 1-8

Publication 1794-UM063A-EN-P - March 2006
1-2 About the FLEX I/O HART Analog Modules
How FLEX I/O Analog
Modules
Communicate with
Programmable Controllers
FLEX I/O analog modules provide best utility when used with ControlNet
products on the ControlNet network. Data connections are established
between the 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 begins an internal diagnostic check. The channel 0 indicator
turns ON to indicate the check has begun. The indicator turns OFF
when the check is finished.
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, see Chapter 2.
3. Following the module configuration download for the 1794-IE8H
module, the module begins producing runtime data for the PLC
processor.
Following the module configuration download for the 1794-OE8H
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.

Publication 1794-UM063A-EN-P - March 2006
About the FLEX I/O HART Analog Modules 1-3
Physical Features of Your
Analog I/O Module
The module label identifies the keyswitch position, wiring and module
type. Use the removable label to note individual designations per
your application.
Indicators
Indicators are provided to identify input or output fault conditions, and to
show when power is applied to the module. For example, the 1794-IE8H
module is shown below.
Use Alarms on the
1794-IE8H Module
The 1794-IE8H 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 Data Format 4.
42054HART
PWR
1794-IE8H
8 CH HART ANALOG INPUT
IN1IN0 IN2 IN3 IN4 IN5 IN6 IN7
3
I/O
1794-IE8H
Module Type
Removable Label
Keyswitch Position
Indicator (#3)
Power On Indicator
Input Designators

Publication 1794-UM063A-EN-P - March 2006
1-4 About the FLEX I/O HART Analog Modules
Data Format Alarm Example
In this example, the normal active data range is 4-20 mA. The alarms are
generated in three overlapping bands.
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.
PHYSICAL INPUT SIGNAL RANGE
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%
Remote Transmitter Error
Up/Down parameter
determines which of these
is active
Programmable
in 20 0.1 mA
steps by Error
Level 0.1 mA
Steps
parameter
100.00% 112.50%
41666