Rockwell Automation 1794-IF4I, 1794-OF4I, 1794-IF2XOF2I, 1794-IF4IXT, 1794-IF4ICFXT 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

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.

Identifies information that is critical for successful application and

IMPORTANT

understanding of the product.

Identifies information about practices or circumstances that can

ATTENTION

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.

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.

Preface

Purpose of this Manual

Audience

Vocabulary

Using 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.

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 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	Describes FLEX I/O Isolated
	your Analog Modules	Analog modules, features,
		and how they function
Chapter 2	How to Install Your Analog	How to install and wire the
	Module	modules
Chapter 3	Module Programming	Explains block transfer
		programming, sample
		programs

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Preface 4

Section	Title	Contents
Chapter 4	Writing Configuration to and	Explains how to configure
	Reading Status from Your	your modules and read
	Module with a Remote I/O	status information from your
	Adapter	modules when using a
		remote I/O adapter
Chapter 5	Communication and I/O	Explains how you
	Image Table Mapping with	communicate with your
	the DeviceNet/ControlNet	modules, and how the I/O
	Adapter	image is mapped when
		using a DeviceNet adapter
Chapter 6	Input, Output, Status and	Explains how you
	Configuration Files for	communicate with your
	Analog Modules when used	modules over ControlNet.
	with 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,	Hazardous location approval
	B, C, D Hazardous Locations
	Statement

Common Techniques Used in this Manual

For Additional Information

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 on FLEX I/O systems and modules, refer to the following documents:

Catalog Numbers	Voltage	Description	Publications
			Installation	User Manual
			Instructions
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

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Preface	5

Catalog Numbers	Voltage	Description	Publications
			Installation	User Manual
			Instructions
1794-ASB2	24V dc	2-Slot Remote I/O Adapter	1794-5.44	1794-6.5.3
1794-TB2		2-wire Terminal Base	1794-5.2
1794-TB3		3-wire Terminal Base
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	1794-5.43
		Unit
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

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.

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Preface 6

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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

Overview of FLEX I/O and your Analog Modules

How to Install Your Analog Module

Module Programming

Chapter

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

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

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

Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter

Communication and I/O Image Table Mapping with the DeviceNet/ControlNet Adapter

Input, Output, Status and Configuration Files for Analog Modules when used with ControlNet

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Chapter

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

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

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

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	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

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Table of Contents	10

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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

Terminal Base

I/O Module

5

I V I V I V I V I V I V

20125

•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 twoor three-wire devices

•I/O module – contains the bus interface and circuitry needed to perform specific functions related to your application

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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:
	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

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:

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

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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

Allen-Bradley

ADAPTER						LOCAL				24VDC
										POWER SUPPLY
ACTIVE				FAULT		FAULT
										RIO ADAPTER
										1794-ASB

1

2

The adapter transfers your configuration data to the module using a BTW.

Flexbus

External devices transmit analog signals to the module.

Allen-Bradley

1794±IE8

ANALOG INPUT

2

4
Your ladder program instructs the	INPUT 0 INPUT 1		INPUT 2 INPUT 3	INPUT 4	INPUT 5	INPUT 6	INPUT 7
	I V	I V	I V I V	I V	I V	I V	I V
adapter to perform a BTR of the values
and stores them in a data table.
5							3

The adapter and module determine

that the transfer was made without error and input values are within specified range.

6

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.

7

Your ladder program performs BTWs to the module when you power it up, and any time you wish to reconfigure the module.

The module converts analog signals into integer format and stores these values until the adapter requests their transfer.

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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.

1794-IF4I

Input Designators

1794-OF4I

Output Designators

1794-IF2XOF2I

Input and Output Designators

Module Type

Removable

Label

Keyswitch

Position

Indicator (#3)

Green Power/Status

Indicator

Module Type

Removable

Label

Keyswitch

Position

Indicator (#4)

Green Power/Status

Indicator

Module Type

Removable

Label

Keyswitch

Position

Indicator (#5)

Green Power/Status

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.

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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:

You need to:	As described under:
Calculate the power requirements of all	Power Requirements, page 2-16
modules in each chassis.
Position the keyswitch on the terminal base	Mounting the Analog Module on the
	Terminal Base Unit, page 2-22

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.

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16 How to Install Your Analog Module

Low Voltage Directive

Power Requirements

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.

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.

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		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.

Daisy-chaining

24V dc

Note: All modules must be analog modules for this configuration.

Wiring when total current draw is less than 10A

Individual

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.

Wiring when total current draw is greater than 10A

Combination

24V dc

24V dc

Note: All modules powered by the same power supply must be analog modules for this configuration.

Total current draw through any base unit must not be greater than 10A

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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

	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.

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

Position terminal base at a slight angle and hooked over the top of the DIN rail.

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		How to Install Your Analog Module	19

Figure 2.2

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

4. Repeat steps 1 - 3 to install the next terminal base.

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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)

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		How to Install Your Analog Module	21

Inches (Millimeters)

.83 (21)

More

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.

Figure 2.3 Drilling Dimensions for Panel/Wall Mounting of FLEX I/O

1.4	2.3	1.4	2.3	1.4
(35.5)	(58.5)	(35.5)	(58.5)	(35.5)

2.Drill the necessary holes for the #6 self-tapping mounting screws.

3.Mount the mounting plate (1) 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
	IMPORTANT
		grounded to the panel. Refer to “Industrial
		Automation Wiring and Grounding Guidelines,”
		publication 1770-4.1.

4.Hold the adapter (2) 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.

The adapter is capable of addressing eight modules. Do not exceed a maximum of eight terminal base units in your system.

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22 How to Install Your Analog Module

Mounting the Analog Module on the Terminal Base Unit

1.Rotate the keyswitch (1) on the terminal base unit (2) clockwise to the position required for the specific type of analog module.

Figure 2.4

	7
3	1

2

6

4

5

		Analog Module Catalog Number		Keyswitch Position
		1794-IF4I, 1794-IF4IXT, 1794-IF4ICFXT		3
		1794-OF4I,	1794-OF4IXT	4
		1794-IF2XOF2I,	1794-IF2XOF2IXT	5

2.Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base/adapter.

You cannot install the module unless the connector is fully extended.

3.Make sure that the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.

4.Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.

5.Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism (7) is locked into the module.

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		How to Install Your Analog Module	23

6.Repeat the above steps to install the next module in its terminal base unit.

	ATTENTION			Remove field-side power before removing or
				inserting the module. This module is designed so
				you can remove and insert it under backplane
				power. When you remove or insert a module with
				field-side power applied, an electrical arc may occur.
				An electrical arc can cause personal injury or
				property damage by:

•sending an erroneous signal to your system’s field devices causing unintended machine motion

•causing an explosion in a hazardous environment

Connecting Wiring for the Analog Modules

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

Wiring to the analog modules is made through the terminal base unit on which the module mounts.

Refer to the following table for recommended terminal base units that you can use for each module.

		Module	1794-TB3		1794-TBT	1794-TB3S	1794-TB3TS	1794-TB3S	1794-TBN,
									-TBNF
		1794-IF4I, 1794-IF4IXT,	Yes		Yes	Yes	Yes	Yes	Yes
		1794-IF4ICFXT
		1794-OF4I, 1794-OF4IXT	Yes		Yes	Yes	Yes	Yes	Yes
		1794-IF2XOF2I,	Yes		Yes	Yes	Yes	Yes	Yes
		1794-IF2XOF2IXT
				Figure 2.5

1794-TB3, -TB3T

1794-TB3S, -TB3TS

1794-TBNF

1794-TBN

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24 How to Install Your Analog Module

Connecting wiring for the individual analog modules is shown on:

		Module		Connecting Wiring
		1794-IF4I, 1794-IF4IXT, 1794-IF4ICFXT		page 2-26
		1794-OF4I,	1794-OF4IXT
		1794-IF2XOF2I,	1794-IF2XOF2IXT	page 2-27

Connecting Wiring using a 1794-TB3, -TB3T, -TB3S or -TB3TS

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-IF4I – the associated terminal on row A.

1794-OF4I – the corresponding terminal on the same row (A)

1794-IF4XOF2I – inputs – the associated terminal on row A; outputs – the corresponding terminal on the same row (A).

3.Refer to Table 2.1 or Table 2.2. Connect +24V dc to designated terminals on the 34-51 row (C), and 24V common todesignated 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 33 ft (10m) for
				dc power cabling.

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		How to Install Your Analog Module	25

	ATTENTION			Remove field-side power before removing or
				inserting the module. This module is designed so
				you can remove and insert it under backplane
				power. When you remove or insert a module with
				field-side power applied, an electrical arc may occur.
				An electrical arc can cause personal injury or
				property damage by:

•sending an erroneous signal to your system’s field devices causing unintended machine motion

•causing an explosion in a hazardous environment

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

0 ±15 A

16±33 B

34±51 C

1794-TB3, -TB3T

Row A

Row B

Row C

Row A

Row B

Row C

1794-TB3S, -TB3TS

4.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 the 24V dc common/return from terminal 33 on this base unit to terminal 16 on the next base unit.

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26 How to Install Your Analog Module

Wiring to a 1794-TBN or 1794-TBNF Terminal Base Unit

1.Connect individual input or output wiring to the even numbered terminals on row (B) as indicated in the table below.

2.Connect the associated return wiring to the corresponding odd numbered terminal on row (C) for each input or output as indicated in the table below.

3.Connect 24V dc to terminal 34 on row (C).

4.Connect 24V dc common to terminal 16 on row (B).

5.If continuing power to the next terminal base unit, connect a jumper from terminal 51 (24V dc) on this base unit to terminal 34 on the next base unit.

16			Even Numbered Terminals 0 thru 14							33	16, 0, 2, 4, 6,
16	0	2	4	6	8	10	12	14	33			B
											8, 10, 12, 14, 33
34		1	3	5	7	9	11	13	15	51	34, 1, 3, 5, 7,	C
											9, 11, 13, 15, 51
	34		Odd Numbered Terminals 1 thru 15								51

1794-TBN, 1794-TBNF

If continuing common to the next terminal base unit, connect a jumper from terminal 33 (24V dc common) on this base unit to terminal 16 on the next base unit.

Table 2.1

Wiring connections for 1794-TB3, -TB3T, -TB3S, -TB3TS, -TBN and -TBNF Terminal Base

Units when using the 1794-IF4I or 1794-OF4I Isolated Analog Module

Channel	Signal Type	Label Markings	1794-TB3, -TB3T1, -TB3S, -TB3TS(2)
			1794-TBN, 1794-TBNF
			Signal	Signal Return
			Terminal
0	Current	I0	0
	Current	I0 Ret		1
	Voltage	V0	2
	Voltage	V0 Ret		3
1	Current	I1	4
	Current	I1 Ret		5
	Voltage	V1	6
	Voltage	V1 Ret		7

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		How to Install Your Analog Module	27

Table 2.1

Wiring connections for 1794-TB3, -TB3T, -TB3S, -TB3TS, -TBN and -TBNF Terminal Base

Units when using the 1794-IF4I or 1794-OF4I Isolated Analog Module

Channel	Signal Type	Label Markings		1794-TB3, -TB3T1, -TB3S, -TB3TS(2)
				1794-TBN, 1794-TBNF
				Signal	Signal Return
				Terminal
2	Current	I2		8
	Current	I2 Ret			9
	Voltage	V2		10
	Voltage	V2 Ret			11
3	Current	I3		12
	Current	I3 Ret			13
	Voltage	V3		14
	Voltage	V3 Ret			15
	24V dc Common	1794-TB3 – 16 through 33(1)
		1794-TB3T, -TB3TS – 17, 18, 33
		1794-TBN, -TBNF – 16 and 33
	+24V dc power		1794-TB3 – 34 thru 51
		1794-TB3T, -TB3TS – 34, 35, 50, 51
		1794-TBN, -TBNF – 34 and 51

(1)Terminals 16 thru 33 are internally connected in the terminal base unit.

(2)Terminal 39 through 46 are chassis ground. Terminals 36, 37, 38 and 47, 48, 49 are used or cold junction compensation.

Table 2.2

Wiring connections for the 1794-IF2XOF2I Isolated Analog Module when using 1794-TB3, -TB3T, -TB3S, -TB3TS, -TBN and -TBNF Terminal Base Units

Channel	Signal Type	Label Markings	1794-TB3, -TB3T(2), -TB3S,
			-TB3TS(2) -TBN, -TBNF
			Signal	Signal Return
			Terminal
Input 0	Current	I0	0
	Current	I0 Ret		1
	Voltage	V0	2
	Voltage	V0 Ret		3
Input 1	Current	I1	4
	Current	I1 Ret		5
	Voltage	V1	6
	Voltage	V1 Ret		7

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28 How to Install Your Analog Module

Table 2.2

Wiring connections for the 1794-IF2XOF2I Isolated Analog Module when using 1794-TB3, -TB3T, -TB3S, -TB3TS, -TBN and -TBNF Terminal Base Units

Channel	Signal Type	Label Markings		1794-TB3, -TB3T(2), -TB3S,
				-TB3TS(2) -TBN, -TBNF
				Signal	Signal Return
				Terminal
Output 0	Current	I2		8
	Current	I2 Ret			9
	Voltage	V2		10
	Voltage	V2 Ret			11
Output 1	Current	I3		12
	Current	I3 Ret			13
	Voltage	V3		14
	Voltage	V3 Ret			15
	24V dc Common	1794-TB3 – 16 thru 33(1)
		1794-TB3T, -TB3TS – 17, 18, 33
		1794-TBN, -TBNF – 16 and 33
	+24V dc power		1794-TB3 – 34 thru 51
		1794-TB3T, -TB3TS – 34, 35, 50, 51
		1794-TBN, -TBNF – 34 and 51

(1)Terminals 16 thru 33 are internally connected in the terminal base unit.

(2)Terminal 39 through 46 are chassis ground. Terminals 36, 37, 38 and 47, 48, 49 are used or cold junction compensation.

	ATTENTION			Total current draw through the terminal base unit is
				limited to 10A. Separate power connections to the
				terminal base unit may be necessary.

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		How to Install Your Analog Module	29

Figure 2.6

1794-IF4I Connections ± 1794-TB3 terminal base shown

I		I	+		I	±
	±
+					Current
Current		Current		±
						Input
Input			Input		+	±
+	±	+				24V dc
						Power Supply
						+

	ac or dc	dc only	Current only
	4-Wire Current	3-Wire Current
			2-Wire Current
	Transmitter	Transmitter	Transmitter and External
			Power Supply

1794-OF4I Connections ± 1794-TB3 terminal base shown

I
+	±

Current

Output

Device

+ ±

ac or dc 4-Wire Output

Device

I

+

Current ±

Output

Device

+

dc only 3-Wire Output Device

I

+

Current

Output

Device

±

Current only 2-Wire Output

Device

1794-IF2XOF2I Connections ± 1794-TB3 terminal base shown

I

±

I

+

+

Current

Current

±

+

Input

±

+

Input

ac or dc

dc only

4-Wire Current

3-Wire Current

Transmitter

Transmitter

I

+

Current

Output

Device

±

Current only

2-Wire Output

Device

A	0 ±15
B	16±33
C	34±51

I +

Voltage ±

Input

+

dc only 3-Wire Transmitter

	A	0 ±15
	B	16±33
	C	34±51
I
+
Voltage	±
Output
Device
+
dc only
3-Wire Output
Device
	A	0 ±15
	B	16±33
	C	34±51
I
+
Voltage	±
Output
Device
+
dc only
3-Wire Output
Device

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30 How to Install Your Analog Module

Module Indicators

The analog modules have one status indicator that is on when power is applied to the module.

1794-IF4I

1794-OF4I

1794-IF2XOF2I

OK Status Indicator ± Indicates power applied to module and status. When flashing, examine module status word.

Chapter Summary

In this chapter you learned how to install your input module in an existing programmable controller system and how to wire to the terminal base units.

Publication 1794-6.5.8 - January 2010