Rockwell Automation 1794-XXXX User Manual
User Manual
FLEX I/O High-Density Analog Modules
Catalog Numbers
IE4XOE2XT, 1794-IE8XOE4
1794-IE8, 1794-IE8XT, 1794-OE4, 1794-OE4XT, 1794-IE12, 1794-OE12, 1794-IE4XOE2, 1794-
Important User Information
IMPORTANT
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
your local Rockwell Automation sales office or online at
http://www.rockwellautomation.com/literature/) 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.
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.
SGI-1.1 available from
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.
SHOCK HAZARD: Labels may be on or inside the equipment, such as a drive or motor, to alert people that
dangerous voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces
may reach dangerous temperatures.
Identifies information that is critical for successful application and understanding of the product.
Allen-Bradley, Rockwell Automation, FLEX I/O, DeviceNet, and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Ro ckwell Automation are property of their respective companies.
ii Rockwell Automation Publication 1794-UM062A-EN-P - September 2012
Table of Contents
Preface
Who Should Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Common Techniques Used in this Manual . . . . . . . . . . . . . . . . . . . . . . . . . vii
Chapter 1
Overview of FLEX I/O and Your
Analog Module
Install Your FLEX I/O Module
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The FLEX I/O System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Types of FLEX I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
How FLEX I/O Analog Modules Communicate with Programmable
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Physical Features of Your Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Before You Install Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Install the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mount on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mount on a Panel or Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mount the Analog Module on the Terminal Base Unit . . . . . . . . . . 13
Wire the Terminal Base Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connect Wiring to the FLEX I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connect Wiring Using a 1794-TB2 or 1794-TB3 Terminal
Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connect Wiring Using a 1794-TB3G or 1794-TB3GS
Terminal Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connect Wiring Using a 1794-TB3S, 1794-TB3T, 1794-TB3TS,
or 1794-TBN Terminal Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Chapter 3
Write Configuration to and Read
Status from Your Module
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Configure Your Analog Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Safe State Value Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Read Data From Your Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Map Data for the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Publication 1732D-IN004A-EN-E - September 2012
iv Table of Contents
Communicate With Your
Module
Chapter 4
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
About DeviceNet Manager. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Communication Over the I/O Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Polled I/O Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Appendix A
Specifications
Differences Between Series
Data Tables
Module Programming
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Output Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
General Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Environmental Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Appendix B
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Appendix C
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Block Transfer Read and Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Appendix D
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Block Transfer Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Sample Programs for FLEX I/O Analog Modules . . . . . . . . . . . . . . . . . . . 67
PLC-2 Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
PLC-3 Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
PLC-5 Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Two’s Complement Binary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Analog Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Scaling Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Example using Compute Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Publication 1732D-IN004A-EN-E - September 2012
Index
Preface
Read this preface to familiarize yourself with the rest of the manual. It provides
information concerning:
• who should use this manual
• the purpose of this manual
• related documentation
• conventions used in this manual
Who Should Use this Manual
Purpose of this Manual
You must be able to program and operate an Allen-Bradley programmable
controller to make efficient use of your FLEX I/O modules. In particular, you
must know how to program block transfers.
We assume that you know how to do this in this manual. If you do not, refer to
the appropriate programming and operations manual before you attempt to
program your modules.
This manual shows you how to use your FLEX I/O Analog modules with
Allen-Bradley programmable controllers. The manual helps you install, program
and troubleshoot your modules.
For Information About See
Overview of FLEX I/O and Your Analog Module
Install Your FLEX I/O Module Chapter 2
Write Configuration to and Read Status from Your Module Chapter 3
Communicate With Your Module Chapter 4
Specifications Appendix A
Differences Between Series Appendix B
Data Tables Appendix C
Module Programming Appendix D
Chapter 1
About the Vocabulary
v Publication 1794-UM062A-EN-P - September 2012
In this manual, we refer to :
• the analog input or analog output module as the "input module" or "output
module"
• the Programmable Controller as the “controller”
vi
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
1794 FLEX I/O Product Data, publication 1794-PP019
FLEX I/O ControlNet Redundant Media Adapter,
publication 1794–5.18
FLEX I/O EtherNet/IP Adapter Module Installation
Instructions, publication 1794-IN082
ControlNet Adapter Module Installation Instructions,
publication 1794-IN101
FLEX I/O DeviceNet Adapter Module Installation
Instructions, publication 1794-IN099
Remote I/O Adapter Module User Manual, publication
1794–UM009
FLEX I/O PROFIBUS Adapter Module Installation
Instructions, publication 1794-IN087
FLEX I/O PROFIBUS Adapter Module User Manual,
publication 1794-UM057
FLEX I/O Terminal Base Units Installation Instructions,
publication 1794-IN092
.
.
.
.
.
.
.
.
. Information on FLEX I/O general product specifications, certifications, and list
of catalogs and descriptions.
Information on how to install the FLEX I/O ControlNet Redundant Media
Adapter
Catalog No. 1794-ACNR.
Information on how to install the FLEX I/O EtherNet/IP Adapter Module
Catalog No. 1794-AENT.
Information on how to install the ControlNet Adapter Modules
Catalog No. 1794-ACN15, 1794-ACNR15.
Information on how to install the FLEX I/O DeviceNet Adapter Modules
Catalog No. 1794-ADN, 1794-ADNK.
Information on how to use the Remote I/O Adapter Module
Catalog No. 1794-ASB.
Information on how to install the FLEX I/O PROFIBUS Adapter
Catalog No. 1794-APB.
Information on how to use the FLEX I/O PROFIBUS Adapter Module
Catalog No. 1794-APB.
Information on how to install the FLEX I/O Terminal Base Units
Catalog No. 1794-TB2, 1794-TB3, 1794-TB3K, 1794-TB3S, 1794-TB32,
1794-TB3G, 1794-TB3GK, 1794-TB3GS, 1794-TB3T, 1794-TB3TS, 1794-TBN,
1794-TBNK, 1794-TBNF.
FLEX I/O Digital Input Modules Installation Instructions,
publication 1794-IN093
FLEX I/O Digital DC Sourcing Output Modules
Installation Instructions, publication 1794-IN094
FLEX I/O Input/ Output Module Installation Instructions,
publication 1794-IN083
FLEX I/O Input and Output Module Installation
Instructions, publication 1794-IN100
Thermocouple/Millivolt Input Module Installation
Instructions, publication 1794-IN050
FLEX I/O 8 Input RTD Module User Manual,
publication 1794-6.5.4
FLEX I/O Thermocouple/Millivolt Input Module User
Manual, publication 1794-6.5.7
FLEX I/O AC Input Modules Installation Instructions,
publication 1794-IN102
Publication 1794-UM062A-EN-P - September 2012
.
.
.
.
.
.
.
.
Information on how to install the FLEX I/O Digital Modules
Catalog No. 1794-IB8, 1794-IB16, 1794-IB16K, 1794-IB32.
Information on how to install the FLEX I/O Digital DC Sourcing Output Modules
Catalog No. 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P, 1794-OB32P.
Information on how to install the FLEX I/O Input and Output Combo Modules
Catalog No. 1794-IB16XOB16P, 1794-IB10XOB6.
Information on how to install FLEX I/O Analog Modules
Catalog No. 1794-IE8/B, 1794-IE4XOE2/B, 1794-OE4/B, 1794-IE8K/B,
1794-OE4K/B.
Information on how to install the Thermocouple/Millivolt Input Modules
Catalog No. 1794-IRT8, 1794-IRT8K, 1794-IRT8XT.
Information on how to use the FLEX I/O 8 Input RTD Module
Catalog No. 1794-IR8.
Information on how to use the Thermocouple and Millivolt Input Module
Catalog No. 1794-IT8.
Information on how to install the FLEX I/O AC Input Modules
Catalog No. 1794-IA8, 1794-IA8I, 1794-IA16.
Resource Description
vii
FLEX I/O Digital AC Output Modules Installation
Instructions, publication 1794-IN103
Interconnect Cable Installation Instructions,
publication 1794-5.12
FLEX I/O DC Power Supply Installation Instructions,
publication 1794-IN069
Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1
Allen-Bradley Industrial Automation Glossary, AG-7.1
Common Techniques Used in this Manual
The following conventions are used throughout this manual:
• 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.
Information on how to install the FLEX I/O Digital AC Output Modules
Catalog No. 1794-OA8, 1794-OA8K, 1794-OA8I, 1794-OA16.
Information on how to install the Interconnect Cable
Catalog No. 1794-CE1, 1794-CE3.
Information on how to install the FLEX I/O DC Power Supply
Catalog No. 1794-PS13, 1794-PS3.
In-depth information on grounding and wiring Allen-Bradley programmable
controllers.
A glossary of industrial automation terms and abbreviations.
Publication 1794-UM062A-EN-P - September 2012
viii
Notes:
Publication 1794-UM062A-EN-P - September 2012
Chapter
I/O moduleTerminal base
20125
Adapter
1
Overview of FLEX I/O and Your Analog Module
Overview
The FLEX I/O System
Read this chapter to familiarize yourself with configurable features on the FLEX
I/O High Density modules. The following table lists where to find specific
information in this chapter.
Topic Page
The FLEX I/O System
Types of FLEX I/O Modules 2
How FLEX I/O Analog Modules Communicate with Programmable
Controllers
Physical Features of Your Modules 4
FLEX I/O is a small, modular I/O system for distributed applications that
performs all of the functions of rack-based I/O. The FLEX I/O system contains
the following components shown below:
1
3
• adapter/power supply – powers the internal logic for as many as eight I/O
modules
• terminal base – contains a terminal strip to terminate wiring for two- or
three-wire devices
• I/O module – contains the bus interface and circuitry needed to perform
1 Publication 1794-UM062A-EN-P - September 2012
specific functions related to your application
2 Overview of FLEX I/O and Your Analog Module
Types of FLEX I/O Modules
The following FLEX I/O analog modules are described in this user manual:
FLEX I/0 Analog Modules
Catalog Number Voltage Inputs Outputs Description
1794-IE8 24V DC 8 — analog – 8 input, single-ended,
1794-IE8XT
1794-IE12 24V DC 12 — analog – 12 input, single-ended,
1794-OE4 24V DC — 4 analog – 4 output, single-ended,
1794-OE4XT
1794-OE12 24V DC — 12 analog – 12 output, single-ended,
1794-IE4XOE2 24V DC 4 2 analog – 4 input, single-ended,
1794-IE4XOE2XT
1794-IE8XOE4 24V DC 8 4 analog – 8 input, single-ended,
(1)
Modules with "XT" indicated in the catalog number signify extended temperature modules.
(1)
(1)
(1)
non-isolated
non-isolated
non-isolated
non-isolated
non-isolated and 2 output,
single-ended, non-isolated
non-isolated and 4 output,
single-ended, non-isolated
FLEX I/O analog input, output and combination modules are block transfer
modules that interface analog signals with any Allen-Bradley programmable
controllers that have block transfer capability. Block transfer programming moves
input from the module’s memory to a designated area in the processor data table,
and output data words from a designated area in the processor data table to the
module’s memory. Block transfer programming also moves configuration words
from the processor data table to module memory.
The analog modules have selectable ranges as shown in the table below:
Analog Module Selectable Ranges
Voltage Current
0…10V DC 0…20 mA
+/- 10V DC 4…20 mA
Publication 1794-UM062A-EN-P - September 2012
Overview of FLEX I/O and Your Analog Module 3
ADAPTER
ACTIVE
FAULT
LOCAL
FAULT
24VDC
POWER SUPPLY
RIO ADAPTER
1794-ASB
IN 0 IN 2 IN 4 IN 6IN 1 IN 3 IN 5 IN 7
TC RTD INPUT 8 CHANNEL
3
1794-IRT8
PWR
FF F F F F FF
45316
The adapter transfers your configuration data.
FlexBus
External devices transmit
analog signals to the module.
The module converts
analog signals into binary
format and stores these
values until the adapter
requests their transfer.
The adapter receives data
from the modules and stores
it in the data table.
The adapter module determine that the
transfer was made without error and
input values are within specified range.
Your ladder program can use and/or move the data (if valid)
before it is written over by the transfer of new data in a
subsequent transfer.
1
4
5
6
2
3
New configuration data can be sent to the
module any time during operation.
7
1794-ACN15
1794-ACNR15
1794-ADN
1794-AENT
1794-AENTR
MicroLogix
1794-ASB
1794-APB
Adapter
1794-AENT shown
How FLEX I/O Analog
Modules Communicate
with Programmable
Controllers
The adapter/power supply transfers data to the module (block transfer write) and
from the module (block transfer read) using BTW and BTR instructions in your
ladder diagram program. These instructions let the adapter obtain input values
and status from the module, and let you send output values and establish the
module’s mode of operation. The Typical Communication Between the Adapter
and a Module figure describes the communication process.
Typical Communication Between the Adapter and a Module
Publication 1794-UM062A-EN-P - September 2012
4 Overview of FLEX I/O and Your Analog Module
1794-IE8 (1794-IE8XT)
1794-IE12
1794-OE12
OK
-
-
OK
Module type
Removable label
Keyswitch
position indicator (#3)
Power on indicator
Module type
Removable label
Keyswitch
position indicator (#3)
Power on indicator
Module type
Removable label
Keyswitch
position indicator (#4)
Power on indicator
46060
Physical Features of Your Modules
The module label identifies the keyswitch position, wiring and module type. A
removable label provides space for writing individual designations per your
application. Indicators are provided to identify input fault conditions, and to
show when power is applied to the module.
Module Labels and Indicators
Publication 1794-UM062A-EN-P - September 2012
Overview of FLEX I/O and Your Analog Module 5
1794-OE4 (1794-OE4XT)
1794-IE4XOE2 (1794-IE4XOE2XT)
1794-IE8XOE4
-
OK
-
OK
-
OK
Module type
Removable label
Keyswitch
position indicator (#5)
Power on indicator
Module type
Removable label
Keyswitch
position indicator (#5)
Power on indicator
46061
Output designators
Module type
Removable label
Keyswitch
position indicator (#4)
Power on indicator
Summary
In this chapter you learned about the FLEX I/O system and the types of analog
modules and how they communicate with programmable controllers.
Publication 1794-UM062A-EN-P - September 2012
6 Overview of FLEX I/O and Your Analog Module
Notes:
Publication 1794-UM062A-EN-P - September 2012
Install Your FLEX I/O Module
Chapter
2
Overview
Before You Install Your Module
This chapter provides you with pre-installation requirements and instructions on
how to install your FLEX I/O analog module.
Topic Page
Before You Install Your Module
Power Requirements 7
Install the Module 9
Wire the Terminal Base Unit 15
Connect Wiring to the FLEX I/O Module 16
Before installing your FLEX I/O analog module, you need to:
• Calculate the power requirements of all modules in each chassis,
• verify that a suitable enclosure is available for installation of the module,
and
• position the keyswitch on the terminal base.
7
Power Requirements
7 Publication 1794-UM062A-EN-P - September 2012
The wiring of the terminal base unit is determined by the current draw through
the terminal base. Make certain that the current draw does not
exceed 10 A.
ATTENTION: Total current draw through the terminal base unit is
limited to 10 A. Separate power connections may be necessary.
ATTENTION: Do not daisy chain power or ground from the terminal
base unit to any AC or DC digital module terminal base unit.
8 Install Your FLEX I/O Module
Digital Input
Module
Analog
Module
Analog
Module
Analog
Module
Digital Output
Module
Digital Input
Module
TC/RTD/mV
Module
Analog
Module
TC/RTD/mV
Module
TC/RTD/mV
Module
TC/RTD/mV
Module
TC/RTD/mV
Module
Daisychain
Individual
Combination
24V DC
24V DC
24V DC
24V DC
24V DC
24V DC
45318
Wiring when total current draw is less than 10A
Wiring when total current draw is less than 10A
Total current draw through any base unit must not be greater than 10A
Methods of wiring the terminal base units are shown in the illustration below.
ATTENTION: Note the following rules for each type of wiring
configuration:
• Daisychain – AIl modules must be analog or TC/RTD/mV modules
for this configuration.
• Individual – Use this type of configuration for any noisy DC digital
I/O modules in your system.
• Combination – All modules powered by the same power supply
must be analog modules for the combination type of
configuration.
Publication 1794-UM062A-EN-P - September 2012
Install Your FLEX I/O Module 9
1
2
3
4
6
7
7
8
9
0
45319
Install the Module
Installation of the analog module consists of:
• mounting the terminal base unit
• installing the analog 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 the section, Mount the Analog Module on the Terminal Base Unit
page 13
.
, on
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.
Make certain that the female FlexBus connector is fully retracted into the
base unit.
Publication 1794-UM062A-EN-P - September 2012
10 Install Your FLEX I/O Module
45320
45321
3. 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; 46277-3).
0
9
1
8
7
6
7
2
3
4
4. 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.
5. 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.
6. 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.
Publication 1794-UM062A-EN-P - September 2012
Install Your FLEX I/O Module 11
45322
Gently push the FlexBus connector into the side of the adapter (or
proceeding terminal base) to complete the backplane connection.
0
9
1
8
7
6
7
2
3
4
For specific wiring information, refer to the installation instructions for
the module you are installing in this terminal base unit.
7. Repeat the above steps to install the next terminal base unit.
Ensure that the cover of the FlexBus connector 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 the section, Mount the Analog Module on the Terminal Base Unit
page 13
.
, on
Publication 1794-UM062A-EN-P - September 2012
12 Install Your FLEX I/O Module
1
2
3
4
45323
millimeter
(inch)
45327
Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.
1.4
(35.5)
0
9
1
8
7
6
7
2
3
4
Description Description
1 Mounting plate for adapter 3 Terminal base unit (not included)
2 #6 Self-tapping screws 4 Adapter module (not included)
To install the mounting plate on a wall or panel:
1. Lay out the required points on the wall/panel as shown in the drilling
dimension drawing.
Drilling Dimensions for Panel or Wall Mounting of FLEX I/O
Millimeters
(Inches)
35.5
(1.4)
58.5
(2.3)
35.5
(1.4)
58.5
(2.3)
21 (0.83)
35.5
(1.4)
Publication 1794-UM062A-EN-P - September 2012
2. Drill the necessary holes for the #6 self-tapping mounting screws.
Install Your FLEX I/O Module 13
IMPORTANT
3. Mount the mounting plate for the adapter module using two #6
self-tapping screws (18 included for mounting up to 8 modules and the
adapter).
Make certain that the mounting plate is properly grounded to the
panel. Refer to Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1
.
4. Hold the adapter at a slight angle and engage the top of the mounting plate
in the indention on the rear of the adapter module.
5. Press the adapter down flush with the panel until the locking lever locks.
6. Position the terminal base unit up against the adapter and push the female
bus connector into the adapter.
7. Secure to the wall with two #6 self-tapping screws.
8. Repeat for each remaining terminal base unit.
Mount the Analog Module on the Terminal Base Unit
The analog module mounts on a 1794-TBx terminal base unit. More specific
terminal bases, see Module and Terminal Base Unit Compatibility
1. Rotate keyswitch (3) on terminal base unit (4) clockwise to the position
required for your module, see table Keyswitch Positions for Your Module
on page 13.
Do not change the position of the keyswitch after wiring the terminal base
unit.
Keyswitch Positions for Your Module
Module Keyswitch Position
1794-IE8 3
1794-IE8XT
1794-IE12
1794-OE12 4
1794-OE4
1794-OE4XT
1794-IE4XOE2 5
1794-IE4XOE2XT
on page 16.
1794-IE8XOE4
Publication 1794-UM062A-EN-P - September 2012
14 Install Your FLEX I/O Module
1
2
3
4
5
6
7
8
Label here or under here
40231
Description Description
1 FlexBus connector 5 Base unit
2 Latching mechanism 6 Alignment groove
3 Keyswitch 7 Alignment bar
4 Cap plug 8 Module
2. Make certain the FlexBus connector (1) is pushed all the way to the left to
connect with the neighboring terminal base or adapter.
You cannot install the module unless the connector is fully extended.
3. Make sure the pins on the bottom of the module are straight so they will
align properly with the connector in the terminal base unit.
ATTENTION: If you remove or insert the module while the 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.
4. Position the module (8) with its alignment bar (7) aligned with the groove
(6) on the terminal base.
Publication 1794-UM062A-EN-P - September 2012
5. Press firmly and evenly to seat the module in the terminal base unit.
The module is seated when the latching mechanism is locked into the
module.
Install Your FLEX I/O Module 15
IMPORTANT
1794-TB2
1794-TB3
A
B
C
0...15
34, 51
16...33
A
B
C
34 and 50 = 24V DC
35 and 51 = common
16, 33 = chassis ground
45328
34 and 50 = 24V DC
35 and 51 = common
16, 33, 38 = chassis ground
40…45, 47 = chassis ground
0123456789101112131415
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
A
B
C
A
B
C
1794-TB3G
1794-TB3GS
0...15
34...51
16...33
0 1 2 3 4 5 6 7 8 9 101112131415
18 19 20 21 22 23 3324 25 26 27 28 29 30 31 3217
35 36 37 38 47 48 49 5034 51
16
39 40 41 42 43 44 45 46
Label placed at top of wiring area
34 and 50 = 24V DC
35 and 51 = common
16 and 33 = chassis ground
40…45 = chassis ground
35 and 51 = common
34 and 50 = 24V DC
16 and 33 = chassis ground
40…45 = chassis ground
45328
6. Remove cap plug and attach another terminal base unit to the right of this
terminal base unit if required.
Make sure the last terminal base has the cap plug in place.
The adapter is capable of addressing eight modules. Do not exceed a
maximum of eight terminal base units in your system.
Wire the Terminal Base Unit
Wiring to the analog modules is made through the terminal base unit on which
the module mounts.
1794-TB2 and 1794-TB3 Wiring
1794-TB3G and 1794-TB3GS Wiring
ATTENTION: Total current draw through the terminal base unit is
limited to 10A. Separate power connections to the terminal base unit
may be necessary.
Publication 1794-UM062A-EN-P - September 2012
16 Install Your FLEX I/O Module
Connect Wiring to the FLEX I/O Module
Module and Terminal Base Unit Compatibility
Module 1794-TB2 1794-TB3 1794-TB3S 1794-TB3G 1794-TB3GS 1794-TB3T 1794-TB3TS TBN
1794-IE8 Yes Yes No No No No No No
1794-IE8XT Yes Yes Yes No No Yes Yes No
1794-IE12 No No No Yes Yes No No No
1794-OE12 No No No Yes Yes No No No
1794-OE4 Yes Yes No No No No No No
1794-OE4XT Yes Yes Yes No No Yes Yes Yes
1794-IE4XOE2 Yes Yes No No No No No No
1794-IE4XOE2XT Yes Yes Yes No No Yes Yes No
1794-IE8XOE4 No No No Yes Yes No No No
Wiring to the analog module is made through the terminal base unit on which
the module mounts.
Verify which terminal base units your module is compatible with in table Module
and Terminal Base Unit Compatibility on page 16.
Connect Wiring Using a 1794-TB2 or 1794-TB3 Terminal Base Unit
1. Connect the individual signal wiring to numbered terminals on the 0…15
row (A) on the terminal base unit. Use Belden 8761 cable for signal wiring.
ATTENTION: Connect only one current or one voltage signal per
channel. Do not connect both current and voltage on one channel.
2. Connect each channel signal return to:
• 1794-IE8 – the associated terminal on row (B).
• 1794-OE4 – the corresponding terminal on the same row (A).
• 1794-IE4XOE2 – inputs: the associated terminal on row (B); outputs:
the corresponding terminal on the same row (A).
3. Connect +24V DC to designated terminals on the 34…51 row (C), and
24V common to designated terminals on the 16…33 row (B).
ATTENTION: To reduce susceptibility to noise, power analog
modules and discrete modules from separate power supplies. Do
not exceed a length of 10 m (33 ft) for power cabling.
Publication 1794-UM062A-EN-P - September 2012
If daisy chaining the +24V DC power to the next base unit, connect a jumper
from terminal 51 on this base unit to terminal 34 on the next base unit. Connect
Install Your FLEX I/O Module 17
the 24V DC common/return from terminal 33 on this base unit to terminal 16
on the next base unit.
Wire Connections for 1794-TB2, and 1794-TB3 using the 1794-IE8 Module
Channel Signal Type Label
Markings
1794-TB2 and 1794-TB3
Input Common Terminal
Input 0 Current I A-0 B-17
Voltage V A-1 B-18
Input 1 Current I A-2 B-19
Voltage V A-3 B-20
Input 2 Current I A-4 B-21
Voltage V A-5 B-22
Input 3 Current I A-6 B-23
Voltage V A-7 B-24
Input 4 Current I A-8 B-25
Voltage V A-9 B-26
Input 5 Current I A-10 B-27
Voltage V A-11 B-28
Input 6 Current I A-12 B-29
Voltage V A-13 B-30
Input 7 Current I A-14 B-31
Voltage V A-15 B-32
24V DC common
B-16…33
(1)
+24V DC power 1794-TB2 – C-34…51
1794-TB3 – C-34…51
(1)
Terminals 16…33 are internally connected in the terminal base unit.
Wire Connections for 1794-TB2, and 1794-TB3 using the 1794-OE8 Module
Channel Signal Type Label
Markings
1794-TB2 and 1794-TB3
Output
Output 1 Current signal I A-0
Current common RET
A-1
(1)
Voltage signal V A-2
Voltage common RET
A-3
(1)
Current signal I A-4
Current common RET
A-5
(1)
Voltage signal V A-6
Voltage common RET
Publication 1794-UM062A-EN-P - September 2012
A-7
(1)
18 Install Your FLEX I/O Module
Wire Connections for 1794-TB2, and 1794-TB3 using the 1794-OE8 Module
Channel Signal Type Label
Markings
Current signal I A-8
Current common RET
Voltage signal V A-10
Voltage common RET
Current signal I A-12
Current common RET
Voltage signal V A-14
Voltage common RET
24V DC common
+24V 1794-TB2 – C-34…51
1794-TB3 – C-34…51
(1)
Terminals 1, 3, 5, 7, 9, 11, 13 and 15 are connected in the terminal base unit.
(2)
Terminals 16…33 are internally connected in the terminal base unit.
1794-TB2 and 1794-TB3
Output
(1)
A-9
(1)
A-11
(1)
A-13
(1)
A-15
B-16…33
(2)
Publication 1794-UM062A-EN-P - September 2012
Install Your FLEX I/O Module 19
Wire Connections for 1794-TB2, and 1794-TB3 using the 1794-IE4XOE2 Module
Channel Signal Type Label
Markings
1794-TB2 and 1794-TB3
Signal Common Terminal
Input 0 Current I 0 17
Voltage V 1 18
Input 1 Current I 2 19
Voltage V 3 20
Input 2 Current I 4 21
Voltage V 5 22
Input 3 Current I 6 23
Voltage V 7 24
Output 0 Current signal I 8
Current common RET
(2)
9
Voltage signal V 10
Voltage common RET
11
(2)
Output 1 Current signal I 12
Current common V
13
(2)
Voltage signal I 14
Voltage common V
24V DC Common
16…33
(1)
15
(2)
+24V DC Power 1794-TB2 – 34…51
1794-TB3 – 34…51
(1)
Terminals 16…33 are internally connected in the terminal base unit.
(2)
Terminals 9, 11, 13, and 15 are internally connected in the module to 24V DC common.
Connect Wiring Using a 1794-TB3G or 1794-TB3GS Terminal Base Unit
1. Connect individual signal wiring to numbered terminals on 0…15 row
(A), and 17…32 row (B) for 1794-TB3G and 1794-TB3GS as indicated in
the following tables.
2. Connect any signal wiring shields to functional ground as near as possible
to the module.
1794-TB3G and 1794-TB3GS only: Connect to earth ground terminals
B16, B33, C38, C40…C45 and C47.
3. Connect the -V DC common (return) to terminal 35 on the 34…51
row (C).
Publication 1794-UM062A-EN-P - September 2012
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