Allen-Bradley 1794-IE8 Series B User manual

User Manual
AllenBradley
FLEX I/O Analog
Modules
(Cat. No. 1794IE8, OE4,
and IE4XOE2 Series B)

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this control
equipment must satisfy themselves that all necessary steps have been taken
to assure that each application and use meets all performance and safety
requirements, including any applicable laws, regulations, codes
and standards.
The illustrations, charts, sample programs and layout examples shown in
this guide are intended solely for example. Since there are many variables
and requirements associated with any particular installation, Allen-Bradley
does not assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this publication.
Allen-Bradley publication SGI–1.1, “Safety Guidelines For The
Application, Installation and Maintenance of Solid State Control”
(available from your local Allen-Bradley office) describes some important
differences between solid-state equipment and electromechanical devices
which should be taken into consideration when applying products such as
those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or
in part, without written permission of Allen–Bradley Company, Inc.
is prohibited.
Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property
damage or economic loss.
Attention helps you:
Identify a hazard.
Avoid the hazard.
Recognize the consequences.
Important: Identifies information that is especially important for
successful application and understanding of the product.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible data loss.
Important User Information

Publication 17946.5.2 - May 1996
Summary of Changes
This publication contains new and revised information not included
in the previous version.
New Information
Addition of DeviceNet Mapping
A new chapter has been added to describe the special mapping for
DeviceNet.
Additional Flex I/O Modules
New series B analog modules are now available for Flex I/O users.
These modules are:
•1794-OE4 series B 4 output analog module
•1794-IE8 series B 8 input analog module
•1794-IE4XOE2 series B 4 in/2 out combo analog module
The differences between series A and series B are explained in
Appendix B.
I/O Mapping
I/O mapping for the series B versions of the analog modules has
been added.
Revised Information
This manual has been revised to include separate chapters for remote
I/O adapters and DeviceNet adapters. In addition, range selection bits
have been revised to include an Off condition.
Change Bars
The areas in this manual which are different from previous editions
are marked with change bars (as shown to the right of this paragraph)
to indicate the addition of new or revised information.

Summary of Changes P1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
New Information P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addition of DeviceNet Mapping P1
. . . . . . . . . . . . . . . . . . . . . . . .
Additional
Flex I/O Modules P1. . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Mapping P1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revised
Information P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Bars P1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using This Manual P-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose of this Manual P-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audience P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vocabulary P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Organization P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions P-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
For
Additional Information P-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview of FLEX I/O and your Analog Modules 1-1. . . . . . . .
Chapter Objectives 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The
FLEX I/O System 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types
of FLEX I/O Modules 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How
FLEX I/O Analog Modules Communicate
with Programmable Controllers 1-2. . . . . . . . . . . . . . . . . . . . . . .
Features of your Analog Modules 1-4
. . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 1-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Install Y our Analog Module 2-1. . . . . . . . . . . . . . . . . .
Chapter Objectives 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before Y
ou Install Y our Analog Module 2-1. . . . . . . . . . . . . . . . . . . . .
Compliance to European Union Directives 2-1
. . . . . . . . . . . . . . . . . .
EMC Directive 2-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low V
oltage Directive 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements 2-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Module 2-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the T
erminal Base Unit on a DIN Rail 2-4. . . . . . . . . . . . .
Panel/Wall
Mounting 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the Analog Module on the T
erminal Base Unit 2-7. . . . . . .
Connecting Wiring for the Analog Modules 2-8
. . . . . . . . . . . . . . . . . .
Connecting Wiring using a 1794TB2 or TB3 T
erminal Base Unit 2-9
Module Indicators 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 2-13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents

Table of Contentsii
Module Programming 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer Programming 3-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sample programs for Flex I/O Analog Modules 3-2
. . . . . . . . . . . . . . .
PLC3 Programming 3-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3.1
PLC3 Family Sample Program Structure for a 1794IE8 Module 3-2
Figure 3.2
PLC3 Family Sample Program Structure for a
1794OE4 Module 3-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3.3
PLC3 Family Sample Program Structure for a
1794IE4XOE2 Module 3-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC5 Programming 3-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3.4
PLC5 Family Sample Program Structure for the 1794IE8 3-4. . . .
Figure 3.5
PLC5 Family Sample Program Structure for the 1794OE4 3-4. . .
Figure 3.6
PLC5 Family Sample Program Structure for the 1794IE4XOE2 3-5
PLC2 Programming 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Data Format 3-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 3-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Writing Configuration to and Reading Status from
Your Module with a Remote I/O Adapter 4-1. . . . . . . . . . .
Chapter Objectives 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Your Analog Module 4-1
. . . . . . . . . . . . . . . . . . . . . . . . .
Range
Selection 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safe
State V alue Selection 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Format 4-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Data From Your Module 4-2
. . . . . . . . . . . . . . . . . . . . . . . . .
Mapping Data for the Analog Modules 4-3
. . . . . . . . . . . . . . . . . . . . .
8 Input Analog Module (Cat. No. 1794IE8 Series B) 4-3
. . . . . . . . .
Analog Input Module (1794IE8) Read 4-3
. . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794IE8 Analog
Input Module Read 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Input Module (1794IE8/B) Write Configuration Block 4-4
.
Range Selection Bits for the 1794IE8/B Analog Input Module 4-5
Word/Bit Descriptions for the 1794IE8/B Analog Input
Module Write 4-5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Output Analog Module (Cat. No. 1794OE4 Series B) 4-6
. . . . . . .
Analog Output Module (1794OE4/B) Read 4-6
. . . . . . . . . . . . .
Bit/Word Descriptions for the 1794OE4/B Analog Output
Module Read 4-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Output Module (1794OE4/B) Write Configuration Block 4-7

Table of Contents iii
Range Selection Bits for the 1794OE4/B Analog Output
Module (Word 5) 4-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794OE4/B Analog Output
Module Write 4-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
Input/2 Output Analog Combo Module
(Cat. No. 1794IE4XOE2 Series B) 4-9. . . . . . . . . . . . . . . . . . .
Analog Combo Module (1794IE4XOE2/B) Read 4-9
. . . . . . . . .
Word/Bit Descriptions for the 1794IE4XOE2/B Analog Combo
Module Read 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Combo Module (1794IE4XOE2/B) W
rite
Configuration Block 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Selection Bits for the 1794IE4XOE2/B Analog
Combo Module 4-11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794IE4XOE2/B Analog
Combo Module Write 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 4-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Communication T akes Place and I/O Image
Table Mapping with the DeviceNet Adapter 5-1. . . . . . . . .
Chapter Objectives 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About DeviceNet Manager 5-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Polled
I/O Structure 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Input Status Word 5-2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Mapping
Data into the Image T able 5-3. . . . . . . . . . . . . . . . . . . . . . .
8 Input Analog Module (Cat. No. 1794IE8 Series B)
Image T able Mapping 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Input Module (1794IE8/B) Read 5-3
. . . . . . . . . . . . . . .
Analog Input Module (1794IE8/B) Write 5-4
. . . . . . . . . . . . . . . .
Range Selection Bits for the 1794IE8/B Analog Input Module 5-4
Word/Bit Descriptions for the 1794IE8/B Analog Input Module 5-4
4 Output Analog Module (1794OE4 Series B) Image
Table Mapping 5-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Output Module (1794OE4/B) Read 5-6
. . . . . . . . . . . . .
Analog Output Module (1794OE4/B) Write 5-6
. . . . . . . . . . . . . .
Range Selection Bits for the 1794OE4/B Analog Output
Module (Write Word 6) 5-7. . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794OE4/B Analog
Output Module 5-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Combo Module (1794IE4XOE2 Series B)
Image T able Mapping 5-9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Combo Module (1794IE4XOE2/B) Read 5-9
. . . . . . . . .
Analog Output Module (1794IE4XOE2/B) Write 5-10
. . . . . . . . . .
Range Selection Bits for the 1794IE4XOE2 Analog
Combo Module 5-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794IE4XOE2 Analog
Combo Module 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defaults 5-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contentsiv
Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differences Between Series A and Series B Analog Modules B-1
Data Table Formats C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two's Complement Binary C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Data Format C-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling Example C-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Support Services C-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Support C-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engineering and Field Services C-1
. . . . . . . . . . . . . . . . . . . . . . . .
Technical Training C-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair and Exchange Services C-1
. . . . . . . . . . . . . . . . . . . . . . . .

Preface
Publication 17946.5.2 - May 1996
Using This Manual
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.
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.
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”
This manual is divided into five chapters. The following chart lists
each chapter with its corresponding title and a brief overview of the
topics covered in that chapter.
Chapter Title Contents
1Overview of FLEX I/O and Analog
modules
Describes FLEX I/O Analog modules, features, and how
they function
2How to Install Your Analog
Module
How to install and wire the modules
3Module Programming Explains block transfer programming, sample programs
4Writing Configuration to and
Reading Status From with a
Remote I/O Adapter
Explains how to configure your modules and read status
information from your modules when using a remote I/O
adapter
5How Communication Takes Place
and I/O Image Table Mapping
with the DeviceNet Adapter
Explains how you communicate with your modules, and
how the I/O image is mapped when using a DeviceNet
adapter
Appendix Title Contents
ASpecifications Specifications for the analog modules
BDifferences Between Series A
and Series B Analog Modules
Lists major differences between series.
CData Formats Explains 2's complement and left justification of numbers
Purpose of this Manual
Audience
Vocabulary
Manual Organization

P–2 Using This Manual
Publication 17946.5.2 - May 1996
We use these conventions in this manual:
In this manual, we show: Like this:
that there is more information about a topic
in another chapter in this manual
that there is more information about the
topic in another manual More
For additional information on FLEX I/O systems and modules, refer
to the following documents:
Catalog
Publications
Catalog
Number Voltage Description Installation
Instructions
User
Manual
1794 1794 FLEX I/O Product Data 17942.1
1794ACN 24V dc ControlNet Adapter 17945.8
1794ADN 24V dc DeviceNet Adapter 17945.14 17946.5.5
1794ASB 24V dc Remote I/O Adapter 17945.11 17946.5.3
1794TB2
1794TB3
2wire Terminal Base
3wire Terminal Base 17945.2
1794TBN Terminal Base Unit 17945.16
1794TBNF Fused Terminal Base Unit 17945.17
1794TB3T Temperature Terminal Base Unit 17945.41
1794IB16 24V dc 16 Input Module 17945.4
1794OB16 24V dc 16 Output Module 17945.3
1794IB10XOB6 24V dc 10 Input/6 Output Module 17945.24
1794IE8 24V dc Selectable Analog 8 Input Module 17945.6
1794OE4 24V dc Selectable Analog 4 Output Module 17945.5 17946.5.2
1794IE4XOE2 24V dc 4 Input/2 Output Analog Module 17945.15
1794IR8 24V dc 8 RTD Input Analog Module 17945.22 17946.5.4
1794IT8 24V dc 8 Thermocouple Input Module 17945.21 17946.5.7
1794IB8S 24V dc Sensor Input Module 17945.7
1794IA8 120V ac 8 Input Module 17945.9
1794OA8 120V ac Output Module 17945.10
1794CE1 Extender Cable 17942.12
1794NM1 Mounting Kit 17942.13
1794PS1 24V dc Power Supply 17945.35
Conventions
For Additional Information

Chapter 1
Publication 17946.5.2 - May 1996
Overview of FLEX I/O and your
Analog Modules
In this chapter, we tell you about:
•what the FLEX I/O system is and what it contains
•types of FLEX I/O analog modules
•how FLEX I/O analog modules communicate with programmable
controllers
•the features of your analog modules
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:
Adapter Terminal Base
I/O Module
20125
IV IV IV IV
5
IVIV
•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 specific functions related to your application
Chapter Objectives
The FLEX I/O System