Allen-Bradley 1794-IF4I User manual

FLEX I/O Isolated
Analog Modules
1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT,
-IF4ICFXT, -OF4IXT, IF2XOF2IXT
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://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.S
Rockwell Automation, Allen-Bradley, FLEX, RSNetWorx, RSLogix5000, and TechConnect are trademarks of Rockwell Automation,
Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
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, 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.

3Publication 1794-6.5.8 - January 2010
Preface
Using this Manual
Purpose of this Manual
This manual shows you how to use your FLEX I/O Isolated Analog
modules with Allen-Bradley programmable controllers. The manual
helps you install, program and troubleshoot your modules.
Except where noted, information that applies to 1794-IF4I, 1794-OF4I,
and IF2XOF2I also applies to 1794-IF4IXT, 1794-IF4ICFXT,
1794-OF4IXT, and IF2XOF2IXT.
Audience
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.
Vocabulary
In this manual, we refer to:
•the isolated analog input or isolated analog output module as
the “input module” or ‘‘output module”
•the Programmable Controller as the “controller”
Manual Organization
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.
Section Title Contents
Chapter 1 Overview of FLEX I/O and
your Analog Modules
Describes FLEX I/O Isolated
Analog modules, features,
and how they function
Chapter 2 How to Install Your Analog
Module
How to install and wire the
modules
Chapter 3 Module Programming Explains block transfer
programming, sample
programs

Publication 1794-6.5.8 - January 2010
Preface 4
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.
For Additional Information
For additional information on FLEX I/O systems and modules, refer to
the following documents:
Chapter 4 Writing Configuration to and
Reading Status from Your
Module 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
Chapter 5 Communication and I/O
Image Table Mapping with
the DeviceNet/ControlNet
Adapter
Explains how you
communicate with your
modules, and how the I/O
image is mapped when
using a DeviceNet adapter
Chapter 6 Input, Output, Status and
Configuration Files for
Analog Modules when used
with ControlNet
Explains how you
communicate with your
modules over ControlNet.
Chapter 7 Calibrating Your Module Explains how to calibrate
your module.
Appendix A Specifications Specifications for the
isolated analog modules
Appendix B Class I, Division 2, Group A,
B, C, D Hazardous Locations
Statement
Hazardous location approval
Section Title Contents
Catalog Numbers Voltage Description Publications
Installation
Instructions
User Manual
1794 1794 FLEX I/O Product Data 1794-2.1
1794-ACN 24V dc ControlNet Adapter 1794-5.8
1794-ACNR 24V dc Redundant Media ControlNet Adapter 1794-5.18
1794-ADN 24V dc DeviceNet Adapter 1794-5.14 1794-6.5.5
1794-ASB/C 24V dc Remote I/O Adapter 1794-5.46 1794-6.5.9

Publication 1794-6.5.8 - January 2010
Preface 5
Summary
This preface gave you information on how to use this manual
efficiently. The next chapter introduces you to the remote I/O adapter
module.
1794-ASB2 24V dc 2-Slot Remote I/O Adapter 1794-5.44 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-TB3S Spring Clamp Terminal Base Unit 1794-5.42
1794-TB3TS Spring Clamp Temperature Terminal Base
Unit
1794-5.43
1794-IB16 24V dc 16 Sink Input Module 1794-5.4
1794-OB16 24V dc 16 Source Output Module 1794-5.3
1794-IV16 24V dc 16 Source Input Module 1794-5.28
1794-OV16 24V dc 16 Sink Output Module 1794-5.29
1794-OB8EP 24V dc 8 Electronically Fused Output Module 1794-5.20
1794-OW8 24V dc 8 Output Relay Module 1794-5.19
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, -CE3 Extender Cables 1794-5.12
1794-NM1 Mounting Kit 1794-5.13
1794-PS1 24V dc Power Supply 1794-5.35
1794-PS13 24V dc Power Supply 1794-5.69
Catalog Numbers Voltage Description Publications
Installation
Instructions
User Manual

Publication 1794-6.5.8 - January 2010
Preface 6

7Publication 1794-6.5.8 - January 2010
Table of Contents
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Preface Using this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Manual Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Common Techniques Used in this Manual . . . . . . . . . . . . . . . 4
For Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table of Contents Chapter
Overview of FLEX I/O and your
Analog Modules
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
The FLEX I/O System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Types of FLEX I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . 12
How FLEX I/O Analog Modules Communicate with
Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Features of Your Analog Modules . . . . . . . . . . . . . . . . . . . . 14
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter
How to Install Your Analog
Module
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Before You Install Your Analog Module. . . . . . . . . . . . . . . . 15
Compliance to European Union Directives . . . . . . . . . . . . . . 15
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Low Voltage Directive (to be confirmed). . . . . . . . . . . . . 16
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mounting the Terminal Base Unit on a DIN Rail . . . . . . . 18
Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Mounting the Analog Module on the Terminal Base Unit. 22
Connecting Wiring for the Analog Modules . . . . . . . . . . . . . 23
Connecting Wiring using a 1794-TB3, -TB3T, -TB3S or -TB3TS
Terminal Base Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Wiring to a 1794-TBN or 1794-TBNF Terminal Base Unit . 26
Module Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Chapter
Module Programming
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Block Transfer Programming . . . . . . . . . . . . . . . . . . . . . . . . 31
Configuration Rungs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Example Configuration Rungs. . . . . . . . . . . . . . . . . . . . . 32
Sample Programs for FLEX I/O Analog Modules. . . . . . . . . . 33
PLC-3 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
PLC-5 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
PLC-2 Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SLC-5 Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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Table of Contents 8
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Chapter
Writing Configuration to and
Reading Status from Your Module
with a Remote I/O Adapter
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configuring Your Analog Module . . . . . . . . . . . . . . . . . . . . 53
Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Safe State Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Real Time Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Input Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Reading Data From Your Module. . . . . . . . . . . . . . . . . . . . . 57
Mapping Data for the Analog Modules. . . . . . . . . . . . . . . . . 57
8 Input Analog Module (Cat. No. 1794-IF4I) . . . . . . . . . . 58
4 Isolated Output Analog Module (Cat. No. 1794-OF4I) . . 64
2 Input/2 Output Analog Combo Module (Cat. No.
1794-IF2XOF2I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Chapter
Communication and I/O Image
Table Mapping with the
DeviceNet/ControlNet Adapter
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
About RSNetWorx and RSLogix . . . . . . . . . . . . . . . . . . . . . . 77
Polled I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . . 78
Mapping Data into the Image Table. . . . . . . . . . . . . . . . . . . 79
4 Input Isolated Analog Module (Cat. No. 1794-IF4I) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
4 Output Isolated Analog Module (Cat. No. 1794-OF4I) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Isolated Analog Combo Module (Cat. No. 1794-IF2XOF2I
Series B) Image Table Mapping . . . . . . . . . . . . . . . . . . . 91
Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Chapter
Input, Output, Status and
Configuration Files for Analog
Modules when used with
ControlNet
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
About the ControlNet Adapter . . . . . . . . . . . . . . . . . . . . . . . 99
Commun ication Over the FLEX I/O Backplane . . . . . . . . . . 99
Polled I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Adapter Input Status Word . . . . . . . . . . . . . . . . . . . . . . 101
Safe State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . 102
Idle State Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Input Data Behavior Upon Module Removal . . . . . . . . . . . 103
4 Input Isolated Analog Module (Cat. No. 1794-IF4I) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Publication 1794-6.5.8 - January 2010
Table of Contents 9
4 Output Isolated Analog Module (Cat. No. 1794-OF4I) Image
Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Isolated Analog Combo Module (Cat. No. 1794-IF2XOF2I)
Image Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . 113
Chapter
Calibrating Your Module
Chapter Objective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
When and How to Calibrate Your Isolated Analog Module . 119
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Calibrating Your Isolated Analog Input Module . . . . . . . . . 121
Bits Used During Calibration . . . . . . . . . . . . . . . . . . . . 121
Offset Calibration for Inputs . . . . . . . . . . . . . . . . . . . . . 122
Setting the Input Gain . . . . . . . . . . . . . . . . . . . . . . . . . 124
Calibrating Your Isolated Analog Output Module . . . . . . . . 125
Bits Used During Calibration . . . . . . . . . . . . . . . . . . . . 125
Calibrating Voltage Outputs . . . . . . . . . . . . . . . . . . . . . 126
Offset Calibration for Voltage Outputs 126
Gain Calibration for Outputs 127
Calibrating Current Outputs . . . . . . . . . . . . . . . . . . . . . 128
Gain Calibration for Current Outputs 128
Offset Calibration for Current Outputs 128
Final Gain Calibration for Current Inputs 130
Scaling Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Scaling Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Appendix
Specifications
Filter Response for 150Hz, 300Hz and 600Hz Conversion 134
Appendix
Class I, Division 2, Group A, B, C, D
Hazardous Locations Statement
Index

Publication 1794-6.5.8 - January 2010
Table of Contents 10

11 Publication 1794-6.5.8 - January 2010
Chapter 1
Overview of FLEX I/O and your Analog
Modules
Chapter Objectives
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
The FLEX I/O System
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 in Figure 1.1:
Figure 1.1
•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
I
V
I
V
I
V
I
V
5
IVIV
20125
Adapter Terminal Base I/O Module

Publication 1794-6.5.8 - January 2010
12 Overview of FLEX I/O and your Analog Modules
Types of FLEX I/O Modules
We describe the following FLEX I/O Analog modules in this user man-
ual:
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:
Catalog Number Voltage Inputs Outputs Description
1794-IF4I 24V dc 4 – analog – 4 input, isolated
1794-OF4I 24V dc – 4 analog – 4 output, isolated
1794-IF2XOF2I 24V dc 2 2 analog – 2 input, isolated and 2 output, isolated
Input Values Data Format Underrange/Overrange
4–20mA signed 2’s complement 4% Underrange, 4% Overrange
±10V signed 2’s complement 2% Underrange, 2% Overrange
±5V signed 2’s complement 4% Underrange, 4% Overrange
0–20mA signed 2’s complement % 0% Underrange, 4% Overrange
4-20mA signed 2’s complement % 4% Underrange, 4% Overrange
0–10V signed 2’s complement % 0% Underrange, 2% Overrange
±10V signed 2’s complement % 2% Underrange, 2% Overrange
0–20mA binary 0% Underrange, 4% Overrange
4–20mA binary 4% Underrange, 4% Overrange
0–10V binary 0% Underrange, 2% Overrange
0–5V binary 0% Underrange, 4% Overrange
±20mA offset binary, 8000H = 0mA 4% Underrange, 4% Overrange
4–20mA offset binary, 8000H = 4mA 4% Underrange, 4% Overrange
±10V offset binary, 8000H = 0V 2% Underrange, 2% Overrange
±5V offset binary, 8000H = 0V 4% Underrange, 4% Overrange

Publication 1794-6.5.8 - January 2010
Overview of FLEX I/O and your Analog Modules 13
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.
Figure 1.2 describes the communication process.
Figure 1.2
An Example of Communication Between an Adapter and an Analog Input Module
ADAPTER
ACTIVE FAULT
LOCAL
FAULT
24VDC
POWER SUPPLY
RIO ADAPTER
1794-ASB
Allen-Bradley
2
Allen-Bradley
INPUT 0 INPUT 2 INPUT 4 INPUT 6INPUT 1 INPUT 3 INPUT 5 INPUT 7
IV IV IV IV IV IV IV IV
ANALOG INPUT
1794±IE8
1
The adapter transfers your configuration data
to the module using a BTW.
Flexbus
External devices transmit
analog signals to the module.
2
The module converts analog signals
into integer format and stores these
values until the adapter requests their
transfer.
3
Your ladder program instructs the
adapter to perform a BTR of the values
and stores them in a data table.
4
The adapter and module determine
that the transfer was made without error
and input values are within specified
range.
5
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.
6
Your ladder program performs BTWs to the module when you power
it up, and any time you wish to reconfigure the module.
7

Publication 1794-6.5.8 - January 2010
14 Overview of FLEX I/O and your Analog Modules
Features of Your Analog
Modules
Each module has a unique label identifying its keyswitch position,
wiring and module type. A removable label provides space for writing
individual designations per your application.
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.
Removable
Label
Input Designators
Output Designators
Keyswitch
Position
Indicator (#3)
1794-IF4I
1794-OF4I
Keyswitch
Position
Indicator (#4)
Module Type
Module Type
Removable
Label
Module Type
Keyswitch
Position
Indicator (#5)
Green Power/Status
Indicator
Green Power/Status
Indicator
Input and Output Designators
1794-IF2XOF2I
Green Power/Status
Indicator
Removable
Label

15 Publication 1794-6.5.8 - January 2010
Chapter 2
How to Install Your Analog Module
Chapter Objectives
In this chapter, we tell you about:
•how to install your module
•how to set the module keyswitch
•how to wire the terminal base
•the indicators
Before You Install Your
Analog Module
Before installing your analog module in the I/O chassis:
Compliance to European
Union Directives
If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and tested
to meet the following directives.
EMC Directive
This product is tested to meet Council Directive 2004/10/EC
Electromagnetic Compatibility (EMC) and the following standards, in
whole or in part, documented in a technical construction file:
•European Union 2004/108/EC EMC Directive, compliant with:
EN 61326-1; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
EN 61000-6-4; Industrial Emissions
EN 61131-2; Programmable Controllers (Clause 8, Zone A & B)
•European Union 2006/95/EC LVD, compliant with:
EN 61131-2; Programmable Controllers (Clause 11)
This product is intended for use in an industrial environment.
You need to: As described under:
Calculate the power requirements of all
modules in each chassis.
Power Requirements, page 2-16
Position the keyswitch on the terminal base Mounting the Analog Module on the
Terminal Base Unit, page 2-22

Publication 1794-6.5.8 - January 2010
16 How to Install Your Analog Module
Low Voltage Directive
This product is tested to meet Council Directive 2006/95/EC Low
Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as the following Allen-Bradley
publications:
•Industrial Automation Wiring and Grounding Guidelines For
Noise Immunity, publication 1770-4.1
•Guidelines for Handling Lithium Batteries, publication AG-5.4
•Automation Systems Catalog, publication B111
Open style devices must be provided with environmental and safety
protection by proper mounting in enclosures designed for specific
application conditions. See NEMA Standards publication 250 and IEC
publication 529, as applicable, for explanations of the degrees of
protection provided by different types of enclosure.
Power Requirements
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 10A.
ATTENTION Total current draw through the terminal base unit is
limited to 10A. Separate power connections may be
necessary.

Publication 1794-6.5.8 - January 2010
How to Install Your Analog Module 17
Methods of wiring the terminal base units are shown in the illustration
below.
ATTENTION Do not daisy chain power or ground from an analog
terminal base unit to any ac or dc discrete module
terminal base unit.
Wiring when total current draw is less than 10A
W iring when total current draw is greater than 10A
Daisy-chaining
Individual
T otal current draw through any base unit must not be greater than 10A
Combination
24V dc
24V dc
24V dc
24V dc
24V dc or
120V ac
24V dc
Note: Use this configuration if using any
ªnoisyº dc discrete I/O modules in your system.
Analog module wiring separate from discrete wiring.
Note: All modules powered by the same power supply
must be analog modules for this configuration.
Note: All modules must be analog modules for this configuration.

Publication 1794-6.5.8 - January 2010
18 How to Install Your Analog Module
Installing 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 Mounting the Analog Module on the
Terminal Base Unit on page 2-22.
Mounting the Terminal Base Unit on a DIN Rail
1. Remove the cover plug (if used) 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. Position the terminal base on the 35 x 7.5mm DIN rail A (A-B pt.
no. 199-DR1; 46277-3; EN 50022) at a slight angle with hook B
on the left side of the terminal base hooked into the right side of
the unit on the left. Proceed as follows:
Figure 2.1
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.
Position terminal base at a slight angle and hooked over the
top of the DIN rail.

Publication 1794-6.5.8 - January 2010
How to Install Your Analog Module 19
Figure 2.2
4. Repeat steps 1 - 3 to install the next terminal base.
Slide the terminal base unit over tight against the adapter.
Make sure the hook on the terminal base slides under the edge of
the adapter and the flexbus connector is fully retracted.
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 to complete the backplane connection.
30077-M

Publication 1794-6.5.8 - January 2010
20 How to Install Your Analog Module
Panel/Wall Mounting
Installation 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 “Mounting the Analog Module on the
Terminal Base” on .
Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.
1794-NM1 Mounting Kit
Contents:
1 ± Mounting Plate for Adapter
2 ± 18 #6 self-tapping screws
(2 for the adapter, and 2
each for up to 8 modules)
Adapter Module
(not included)
Terminal Base Unit
(not included)