Rockwell Automation 1797-OE8 User Manual

FLEX Ex Analog
Modules

1797-IE8, -IE8NF, and -OE8

User Manual

Important User Information

Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication SGI-1.1 available from your local
Rockwell Automation sales office or online at http://www.ab.com/manuals/gi)
describes some important differences between solid state equipment and hard-wired
electromechanical devices. Because of this difference, and also because of the wide
variety of uses for solid state equipment, all persons responsible for applying this
equipment must satisfy themselves that each intended application of this equipment is
acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular
installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written
permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we may use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

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 understanding of the product.

Identifies information about practices or circumstances that can
lead to personal injury or death, property damage, or economic
loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Labels may be located on or inside the equipment to alert people
that dangerous voltage may be present.

Labels may be located on or inside the equipment to alert people
that surfaces may be dangerous temperatures.

Summary of Changes

The information below summarizes the changes to this manual since the last
printing.

To help you find new and updated information in this release of the manual,
we have included change bars as shown to the right of this paragraph.

The table below lists the sections that document new features and additional
or updated information about existing features.

For this information See

New Related Publications P-2

EMC Directive 3-2

ATEX Directive 3-2

Installation in Zone 1 3-3

Installation in Zone 22 3-3

1797-IE8 and -IE8NF Specifications A-1

1797-IE8 and -IE8NF UL, C-UL I/O Entity Parameters A-4

1797-IE8 and -IE8NF FM I/O Entity Parameters A-7

1797-OE8 Specifications A-10

1797-OE8 UL, C-UL I/O Entity Parameters A-12

1797-OE8 FM I/O Entity Parameters A-15

i Publication 1797-6.5.1 - May 2005

Summary of Changes ii

Notes:

Publication 1797-6.5.1 - May 2005

Tab le of Co nt en ts

Preface

About the FLEX Ex Analog
Modules

Why Read This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Who Should Read This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

What This Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

For Additional Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Chapter 1

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

What the FLEX Ex Analog I/O Modules Do . . . . . . . . . . . . . . . . . . 1-1

How FLEX Ex Analog Modules Communicate

with Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Events following Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Physical Features of Your Analog I/O Module . . . . . . . . . . . . . . . . . 1-3

Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Using Alarms on the 1797-IE8 and -IE8NF Modules. . . . . . . . . . . . 1-3

Data Format Alarm Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Remote Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Local Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Understanding Configurable
FLEX Ex Analog Module Features

Chapter 2

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Selecting a 1797-IE8 or -IE8NF FLEX Ex Analog

Input Module’s Operating Features . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Fault Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Remote Transmitter Error Up or Down . . . . . . . . . . . . . . . . . . . 2-3

High Low Error Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Input Filter Cutoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Selecting a 1797-OE8 FLEX Ex Analog Output

Module’s Operating Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Local Fault Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Latch Retry Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Global Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Analog Digital State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Analog Fault State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Digital Fault State. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

i Publication 1797-6.5.1 - May 2005

ii

How to Install Your FLEX Ex
Analog Modules

Understanding Image Table Mapping and Bit/Word Descriptions 2-13

Bit Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Analog Input Modules (1797-IE8 and -IE8NF) Image Table

Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Bit/Word Description for the Analog Input Modules

(1797-IE8 and -IE8NF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Analog Output Module (1797-OE8) Image Table Mapping. . . 2-16

Bit/Word Descriptions for the Analog Output Module

(1797-OE8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

Chapter 3

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Before You Install Your Analog Module . . . . . . . . . . . . . . . . . . . . . . 3-1

Compliance to European Union Directives . . . . . . . . . . . . . . . . . . . . 3-2

EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

ATEX Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Installation in Zone 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Installation in Zone 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Electrostatic Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Mounting on a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Mounting the Analog Modules on the Terminal Base Unit. . . . . 3-9

Wiring the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Connecting Wiring to the FLEX Ex I/O Analog Modules. . . . . . . 3-11

Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Connections for the 1797-IE8 and -IE8NF Modules . . . . . . . . 3-11

Connections for the 1797-OE8 Module. . . . . . . . . . . . . . . . . . . 3-13

Grounding the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Publication 1797-6.5.1 - May 2005

Input, Output, and Configuration
Files for the Analog I/O Modules
on the ControlNet Network

Calibrating Your Module

iii

Chapter 4

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Using Programming Software in Your FLEX Ex Application . . . . . 4-2

About the ControlNet Ex Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Communication Over the FLEX Ex Backplane. . . . . . . . . . . . . . . . . 4-3

Scheduled Data-Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Unscheduled Data-Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

I/O Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Adapter Status Word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Fault State Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Device Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Communication Fault Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Idle State Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Input Data Behavior upon Module Removal. . . . . . . . . . . . . . . . 4-8

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Chapter 5

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

When and How to Calibrate Your FLEX Ex Analog I/O Module . 5-1

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Using Calibration Module Command Words . . . . . . . . . . . . . . . . . . . 5-2

Typical MODULE Calibration Command Word . . . . . . . . . . . . 5-3

Calibrating the Input Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Calibrating the Output Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Applying FLEX Ex Analog I/O
Modules

Chapter 6

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Evaluate the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Define the Area Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Decide Classification Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Determine Hazard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Determine Temperature Rating . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Select Protection Method(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Match Field Devices and I/O Modules . . . . . . . . . . . . . . . . . . . . . . . 6-3

P/I Analog Transmitter Functional and IS Parameters. . . . . . . . 6-3

1797-IE8 and -IE8NF Functional and IS Parameters . . . . . . . . . 6-4

Loop Functionality Verification . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Intrinsic Safety Entity Verification . . . . . . . . . . . . . . . . . . . . . . . . 6-6

I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Optimize Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Assigning Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Publication 1797-6.5.1 - May 2005

iv

Troubleshooting the FLEX Ex
Analog I/O Modules

Specifications

Chapter 7

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1797-IE8 and -IE8NF Modules . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

1797-OE8 Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Appendix A

1797-IE8 and -IE8NF Input Modules . . . . . . . . . . . . . . . . . . . . . . . A-1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

1797-IE8 and -IE8NF CE, CENELEC I/O Entity Parameters A-3

1797-IE8 and -IE8NF UL, C-UL I/O Entity Parameters . . . . A-4

1797-IE8 and -IE8NF FM I/O Entity Parameters . . . . . . . . . . A-7

1797-OE8 Output Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10

1797-OE8 CENELEC I/O Entity Parameters . . . . . . . . . . . . A-11

1797-OE8 UL, C-UL I/O Entity Parameters . . . . . . . . . . . . . A-12

1797-OE8 FM I/O Entity Parameters . . . . . . . . . . . . . . . . . . . A-15

Index

Publication 1797-6.5.1 - May 2005

Preface

Why Read This Manual

Who Should Read This Manual

About the Vocabulary

What This Manual Contains

This manual shows you how to use your FLEX Ex™ analog modules with the
ControlNet Ex
install, program, and troubleshoot your module.

You must be able to program and operate a ControlNet Ex product and
ControlNet

In this manual, we refer to the:

• 1797-IE8 and -IE8NF as the “input modules”

• 1797-OE8 as the “output module”

The following chart lists each chapter with its corresponding title and a brief
overview of the topics covered in that chapter.

Chapter Title Contents

™ products and ControlNet network. The manual helps you

™ network to make efficient use of a FLEX Ex module.

1 About the FLEX Ex Analog Modules Describes module functionality and

physical features

2 Understanding Module Features Describes configurable module

features and configuration bits

3 How to Install Your Analog Module How to install and wire the modules

4 Input, Output and Configuration Files

for the Analog I/O Modules on the
ControlNet network

5 Calibrating Your Module Lists the tools needed, and the

6 Applying FLEX Ex Analog I/O

Modules to the System

7 Troubleshooting Your Module How to use the indicators to

Appendix Title Contents

A About the Specifications Outlines module specifications and

B Programming the FLEX Ex I/O

Modules Using RIO

Describes how to use these I/O
modules over the ControlNet
network

methods used to calibrate the
module

Describes how FLEX Ex is different
from traditional control systems

troubleshoot your module

accuracy

Explains how to program the analog
modules

1 Publication 1797-6.5.1 - May 2005

Preface 2

For Additional Information

For additional information on FLEX Ex systems and modules, refer to the
following documents.

Catalog
Number

1797 Series FLEX Ex Selection Guide 1794-SG002

1797 Series ControlNet Ex System Cable Guide 1797-6.2.1

1797-TB3 FLEX Ex Terminal Base

1797-TB3S FLEX Ex Spring Clamp Terminal Base

1797-OE8 FLEX Ex 8 Output Analog Module

1797-OE8H FLEX Ex HART 8 Ouput Analog

Module

1797-IRT8 FLEX Ex RTD/Thermocouple/mV

Module

1797-IE8 FLEX Ex 8 Input Analog Module

1797-IE8NF FLEX Ex 8 Input Analog Module with

Noise Filter

1797-IE8H FLEX Ex HART 8 Input Analog Module 1797-6.5.3

1797-OB4D 4 Output Module 1797-5.6

Description

Installation
Instructions

1797-5.1

1797-5.3

1797-5.4 1797-6.5.2

1797-5.5

Publications

User Manual

1797-6.5.1

1797-6.5.3

1797-6.5.1

1797-IBN16 FLEX Ex NAMUR Digital Input Module 1797-5.7

1797-PS2E2 FLEX Ex Power Supply 1797-5.8

1797-IJ2 2 Frequency Input Module 1797-5.9 1797-6.5.4

1797-PS2N2 FLEX Ex Power Supply 1797-5.12

1797-BIC FLEX Ex Bus Isolator

1797-CEC FLEX Ex Flexbus Connector

1797-ACNR15 ControlNet Ex Adapter 1797-5.14

1797-RPA,

-RPFM

1797-TPR,

- TPRS, -TPYR,

-TPYS

1797-CE1S,

-CE3S, -CEFTN,

-CEFTE

1797-EXMK Marker Kit 1797-5.23

1797-PS1E FLEX Ex Power Supply 1797-5.33

1797-PS1N FLEX Ex Power Supply 1797-5.34

1797-BCNR FLEX Ex Redundant ControlNet

Fiber Hub

FLEX Ex Taps

Interconnect Cables

Barrier Module

1797-5.13

1797-5.15

1797-6.2.1

1797-5.18

1797-5.20

1797-5.35

Publication 1797-6.5.1 - May 2005

Chapter

About the FLEX Ex Analog Modules

1

What this Chapter Contains

What the FLEX Ex Analog I/O Modules Do

Read this chapter to familiarize yourself with the input and output analog
modules.

For information on: See page:

What the FLEX Ex Analog I/O
Modules Do

How FLEX Ex Analog Modules
Communicate with Programmable
Controllers

Physical Features of Your Analog I/O
Module

Chapter Summary 1-6

The 1797-IE8 and -IE8NF modules accept up to 8 analog inputs. The inputs
are non-isolated and will accept current in either of the following two ranges:
4-20mA or 0-20mA. The default input range is 0-20mA. The inputs have both
fixed hardware filters and selectable firmware digital filters.

Similarly, the 1797-OE8 module provides as many as 8 analog outputs. The
outputs are nonisolated and will provide current in either of the following two
ranges: 4-20mA or 0-20mA. The default output range is 0-20mA.

1-1

1-2

1-3

Each module offers:

• local microprocessor intelligence for advanced features

• full functionality without switches or jumpers

• multiple data ranges that can be independently programmed

in channel groups

• lead breakage detection

• overrange/underrange alarms

• remote transmitter alarm

as well as a host of other module features.

1 Publication 1797-6.5.1 - May 2005

1-2 About the FLEX Ex Analog Modules

How FLEX Ex Analog Modules Communicate with Programmable Controllers

FLEX Ex analog I/O modules provide best utility when used with ControlNet
Ex products on the ControlNet network. Data connections are established
between the I/O module and an Allen-Bradley programmable controller to
transfer information between the two at a scheduled rate.

Input module information is then automatically made available in the PLC
data table through the data connection. Reciprocally, output data information
determined by the PLC program is also automatically transferred from the
PLC data table to the output module through the data connection.

In addition, when the data connection is originally established, configuration
information for the module is automatically transferred to it via the network.

Events following Power-Up

You must apply intrinsically safe +/-V power to your FLEX Ex analog I/O
modules. The following sequence of events occurs after power has initially
been applied to your module:

1. The module begins an internal diagnostic check. The channel 0 LED
indicator turns ON to indicate the check has begun. The indicator turns
OFF when the check is finished.

2. After the diagnostic check, module configuration information, selected
by the user and downloaded over the network, is applied by the module.

For more information on configuration options, see Chapter 2.

3. Following the module configuration download for the 1797-IE8 or

-IE8NF modules, the module begins producing runtime data for the

PLC.

Following the module configuration download for the 1797-OE8

module, the module applies configuration data to output channels.

4. If any diagnostics or alarms are generated during normal module

operation, the data is returned to the PLC.

Publication 1797-6.5.1 - May 2005

About the FLEX Ex Analog Modules 1-3

Physical Features of Your Analog I/O Module

The module label identifies the keyswitch position, wiring and module
type. Use the removable label to note individual designations per
your application.

Indicators

Indicators are provided to identify input or output fault conditions, and to
show when power is applied to the module. For example, the 1797-IE8
module is shown below.

1797-IE8

Module Type

Removable Label

Ex

8 CHANNEL ANALOG INPUT

IN1IN0 IN2 IN3 IN4

IN5

1797-IE8

IN6 IN7

PWR

Keyswitch Position

3

Indicator (#3)

Power On Indicator

Using Alarms on the 1797-IE8 and -IE8NF Modules

Input Designators

40070

The 1797-IE8 and -IE8NF FLEX Ex modules are capable of generating four
alarms:

• Underrange

• Overrange

• Remote Fault

• Local Fault

These alarm conditions are described in general terms and as they relate to bits
on the FLEX Ex I/O module on the following pages. The following graphic
shows at what values these alarms are generated for Data Format 4.

Publication 1797-6.5.1 - May 2005

1-4 About the FLEX Ex Analog Modules

0mA 4mA 20mA 22mA

Data Format Alarm Example

In this example, the normal active data range is 4-20mA. The alarms are
generated in three overlapping bands.

PHYSICAL INPUT SIGNAL RANGE

underrange overrange

remote fault remote fault

local
fault

local
fault

-25.00%

-12.50%

programmable

in 20 0.1mA

steps by Error

Level 0.1mA

Steps

parameter

0.00%

Remote Transmitter Error

Up/Down parameter

determines which of these

is active

100.00% 112.50%

programmable

in 20 0.1mA

steps by Error

Level 0.1mA

Steps

parameter

Overrange Alarm

The Overrange alarm notifies you when module input is overrange. When the
input signal exceeds 100% (20mA), an Overrange Alarm is generated.

This alarm stays active at any value above 100% of range and is always enabled
by the module.

Underrange Alarm

41666

Publication 1797-6.5.1 - May 2005

The Underrange alarm works in a fashion converse to the overrange. This
feature notifies you when the input signal falls underrange. If the input signal
falls below 0% (4mA), an Underrange Alarm is generated.

This alarm stays active at any value below 0% of range and is always enabled by
the module.

About the FLEX Ex Analog Modules 1-5

Remote Fault Alarm

The Remote Fault Alarm is primarily intended for use with remote transmitter
loops.

For example, the remote transmitter may be measuring temperature and
converting it to a standard mA signal. In such a loop, though, the input module
cannot determine the state of the loop on the far side of the transmitter.
However, the remote transmitter may be capable of diagnosing a problem in
the remote loop and signal the input module local loop with a preprogrammed
out of range (high or low) value.

The Remote Fault Alarm allows the 1797-IE8 and -IE8NF modules to work
with transmitters like the one just described. You must use the Remote
Transmitter Error Up or Down feature, see page 2-3, to configure your
application for Remote Fault notification.

For example, you must determine if you want a remote fault to cause
high out of range values or low out of range values to be returned to
the controller.

IMPORTANT

Once the alarm is issued, it remains active as long as the
input signal value remains above the programmed value.

Using Remote Fault Alarm to Determine High High or Low Low Alarm Levels

If you do not have a remote transmitter in your loop, this alarm can also be
used to program a high high or low low alarm level between the levels which
actuate the overrange or underrange alarms and the high or low local fault
alarms.

IMPORTANT

When establishing high high or low low alarms, you can
only select one side (high or low). You must use the
Remote Transmitter Error Up or Down feature in
conjunction with this alarm.

Publication 1797-6.5.1 - May 2005

1-6 About the FLEX Ex Analog Modules

Programming the Remote Fault Alarm

For the Remote Fault alarm, you must program the threshold in 0.1mA steps
at any level on the high or low end of input signal range. The Remote Fault
alarm activates if your I/O module receives input signal values of:

• 100.63% (20.1mA) to 111.88% (21.9mA) on the high end of input

signal range

or

• -0.63% (3.9mA) to -11.88% (2.1mA) on the low end of input

signal range

IMPORTANT

This alarm is only active for one band, either on the high
side of normal operation or the low side.The Remote
Transmitter Error Up/Down parameter determines which
side is active. See page 2-3 for a description of the Remote

Transmitter Error Up/Down feature.

Local Fault Alarm

The Local Fault alarm notifies you when the loop to the transmitter or field
device, if no transmitter is used, is open or shorted.

IMPORTANT

• 112.50% (22mA) or higher on the high end of input signal range - This

value indicates a short in the loop.

or

Once the alarm is issued, it remains active as long as the
input signal value remains in the programmed range.

Chapter Summary

Publication 1797-6.5.1 - May 2005

• -12.50% (2mA) or lower on the low end of input signal range - This

value indicates an open wire condition in the loop.

The Remote Fault and Local Fault alarms are issued with the same bit whether
the cause is an under or overrange. Monitor the Overrange and Underrange
bits in your programming software to determine if the problem is a high
current or low current.

In this chapter, you learned what FLEX Ex analog I/O modules do. Move on
to Chapter 2 to learn about configurable features on your module.

Chapter

Understanding Configurable FLEX Ex Analog Module Features

2

What this Chapter Contains

Read this chapter to familiarize yourself with configurable features on the
input and output analog modules.

For information on: See page:

Selecting a 1797-IE8 or -IE8NF FLEX
Ex Analog Input Module’s Operating
Features

Selecting a 1797-OE8 FLEX Ex
Analog Output Module’s Operating
Features

Understanding Image Table Mapping
and Bit/Word Descriptions

Chapter Summary 2-18

Use the table below to see what features this chapter describes.

Table 2.1 Configurable Features on the FLEX Ex Analog I/O Modules

1797-IE8 and -IE8NF input module
features:

Fault Mode Output Enable

Remote Transmitter Error Up or Down Module Fault State Mode

2-2

2-7

2-13

1797-OE8 output module features:

High Low Error Level Local Fault Mode

Input Filter Cutoff Digital Output

Data Format Latch Retry Mode

Global Reset

Analog Digital State

Analog Fault State

Digital Fault State

Data Format

Fault Alarm

1 Publication 1797-6.5.1 - May 2005

2-2 Understanding Configurable FLEX Ex Analog Module Features

You must use the I/O configuration portion of your PLC programming
software to select and configure these features. This manual assumes
familiarity with the programming software. A brief description of each
module feature is provided here. For more information on your
programming software, see the software user manual.

Selecting a 1797-IE8 or

-IE8NF FLEX Ex Analog
Input Module’s Operating
Features

All features of the 1797-IE8 and -IE8NF analog input modules are
independently configurable in two four-channel groups (channel 0-3 &
channel 4-7).

IMPORTANT

The default selection value for all parameters is 0.

Fault Mode

Your input modules are capable of indicating various fault conditions,
depending on the input signal value. Use the Fault Mode feature to enable or
disable two alarms:

• Remote Fault alarm

• Local Fault alarm

Use your programming software to set the Fault Mode bit to 0 to disable these
alarms. Set the bit to 1 to enable them.

Publication 1797-6.5.1 - May 2005

IMPORTANT

For more information on Remote and Local Fault alarms, see page 1-5.

Fault Mode will only enable or disable the Remote and
Local Fault alarms. It does not affect the Underrange and
Overrange alarms. They are always active.

Understanding Configurable FLEX Ex Analog Module Features 2-3

Remote Transmitter Error Up or Down

A second feature of your input modules that affects use of the Remote Fault
alarm is the Remote Transmitter Error Up or Down feature. Used in
conjunction with the High Low Error level, this feature designates whether
remote faults are displayed with input signal readings beyond the high or low
signal levels normally used by the module.

When setting the Remote Transmitter Error Up or Down feature in your
programming software, set this feature’s bit to 0 to select up. Set the bit to 1 to
select down.

For more information on Remote and Local Fault alarms, see page 1-5.

High Low Error Level

High Low Error level sets the high and low signal levels at which your input
modules will indicate a signal fault. This feature works in conjunction with the
Remote Transmitter Error Up or Down.

If the Remote Fault Alarm feature is enabled and a remote fault occurs, the
module will detect and report the fault, depending on how the High Low
Error level is configured.

Use your programming software to set the high or low error levels.

Input Filter Cutoff

Eight available input filter settings allow you to choose the best rolloff
frequency for input channels on your I/O module. When choosing a filter,
remember that time filter selection affects your input signal’s accuracy.

For example, if you choose the highest frequency of 1200Hz (filter 0), signal
noise is more likely to affect the reading, but the slowest frequency
of 0.5Hz (filter 7) provides the most accurate signal due to incoming
noise filtering.

See Table 2.2 to decide which input filter to use in your FLEX Ex
analog I/O application:

Table 2.2 Input Filter Frequency

Filter:76543210

1797-IE8
Frequency:

1797-IE8NF
Frequency:

0.5Hz (2s) 1Hz (1s) 2Hz (500ms) 4Hz (250ms) 10Hz (100ms) 20Hz (50ms) 40Hz (25ms) 1200Hz (0.8ms)

Reserved

Choose the best input filter cutoff in your programming software.

Publication 1797-6.5.1 - May 2005

2-4 Understanding Configurable FLEX Ex Analog Module Features

(

)

(

)

Data Format

You must choose a module data format in your user prog ram. See Table 2.3 on
page 2-4 for an explanation of each bit. Formats 8, 9, 10 and 15 are not used. If
they are selected for a channel quad, a configuration fault will occur and will be
reported as Diagnostic Data “2”. All data for that channel quad will be set to
zero (0).

When using Table 2.3, remember the following:

• Formats 5, 12, 13 and 14 are 2’s complement data formats, and will

return data in that form.

• 12 Formats are available

• Default format is 0-20mA

• The data format selected interprets input readings and returns them to

the PLC

Data
Format

Format Resolution Input

0 0-20mA as mA0.1% of

1 0-20mA as %0.2% of

2 0-20mA

as √%

3 0-20mA as

unsigned
integer

4 4-20mA as mA0.1% of

0-20mA

0-20mA

0.19% of
0-20mA

0.03% of
0-20mA

4-20mA

Table 2.3 1797-IE8 and -IE8NF Data Formats

Module Data Processing Data Table Value

Range

0-22mA datatable = 1,000 (input) 0-22000

0-22mA 0-11000

0-22mA 0-10488

0-20mA 0-65,535

2-22mA datatable = 1,000 (input) 2000-22000

datatable = 10,000

datatable = 10,000

IF . . . Square_Root_Threshold

< 10,000

Else . . . datatable = 0

datatable = 65,535

√

input

20

√

input

20

input

20

input

20

(interpretation)

(0-22.000mA)

(0-110.00%)

(0-104.88%)

(0-22mA)

(2.000-22.000mA)

Count
per mA

1000 with

500 with

524 with

3276 with

1000 with

Error
Steps

error
steps

error
steps

error
steps

error
steps

error
steps

Publication 1797-6.5.1 - May 2005

Understanding Configurable FLEX Ex Analog Module Features 2-5

(

)

(

)

(

)

(

)

(

)

(

)

Table 2.3 1797-IE8 and -IE8NF Data Formats

Data
Format

Format Resolution Input

Range

5 4-20mA as %0.16% of

4-20mA

6 4-20mA

as √%

7 4-20mA as

unsigned
integer

8 0-20mA not assigned all fixed

9 0-20mA not assigned all fixed

10 0-20mA not assigned all fixed

11 0-20mA as

A/D count

12 4-20mA as %0.16% of

0.17% of
4-20mA

0.03% of
4-20mA

0.04% of
0-20mA

4-20mA

2-22mA -1250 - +11250

4-22mA 0-10607

4-20mA 0-65,535

0-22mA 0-55000

3.6-21mA -250 - +10625

Module Data Processing Data Table Value

(interpretation)

√

input-4

16

input-4

16

input-4

16

input-4

16

input

22

input-4

16

(2’s complement)
(-12.50% ­+112.50%)

(0-106.07%)

(4-20mA)

(0-22mA)

( 2 ’ s c o m p l e m e n t )
(-2.50% ­+106.25%)

datatable = 10,000

datatable = 10,000

IF . . . Square_Root_Threshold

< 10,000

Else . . . datatable = 0

datatable = 65,535

datatable = 55,000

datatable = 10,000

√

Count
per mA

625 with

589 with

4095 with

2500 all fixed

625 NAMUR

Error
Steps

error
steps

error
steps,
under­range not
allowed

error
steps

NE 4
all fixed

13 4-20mA

as %

14 4-20mA

as %

15 4-20mA not assigned all fixed

0.16% of
4-20mA

0.16% of
4-20mA

3-21mA -625 - +10625

2-22mA -1250 - +11250

datatable = 10,000

datatable = 10,000

input-4

16

input-4

16

( 2 ’ s c o m p l e m e n t )
(-6.25% ­+106.25%)

( 2 ’ s c o m p l e m e n t )
(-12.50% ­+112.50%)

625 all fixed

625 all fixed

Publication 1797-6.5.1 - May 2005

2-6 Understanding Configurable FLEX Ex Analog Module Features

Data Formats and Error Ranges

The graphic below shows the data formats and error ranges for your
FLEX Ex analog I/O modules.

PHYSICAL INPUT SIGNAL RANGE

0mA 20mA 22mA

normal signal range overrange

Format 0
Format 1
Format 2
Format 3

Format 4
Format 5
Format 6
Format 7

Format 8
Format 9
Format 10
Format 11

0.00mA

0.00%

0.00%
0

0mA 20mA 22mA

underrange

remote fault

local
fault

2mA

-12.50%

0.00mA

-25.00%

0mA 20mA 22mA

2mA
2mA

programmable

in 20

0.1mA steps

normal signal range

0

normal signal range

4.00mA

0.00%

0.00%
0

Not assigned
Not assigned
Not assigned

20.00mA

100.00%

100.00%
65,535

20.00mA

100.00%

100.00%
65,535

50,000 55,00055,000

programmable

0.1mA steps

programmable

0.1mA steps

in 20

overrange

in 20

overrange

remote fault

22.00mA

110.00%

104.88%
22mA

remote fault

22.00mA

112.50%

106.07%
22mA

remote fault

local
fault

local
fault

local
fault

0mA 20mA 22mA

Format 12
Format 13
Format 14
Format 15

-25.00%

-25.00%

-25.00%

Publication 1797-6.5.1 - May 2005

remote fault

-12.50%

-12.50%

-12.50%

underrange

local
fault

-2.50%

-6.25%

-12.50%

normal signal range

Not assigned

-0.00%

-0.00%

-0.00%

100.00%

100.00%

100.00%

overrange

106.25%

106.25%

112.50%

remote fault

112.50%

112.50%

112.50%

local
fault

41667

Understanding Configurable FLEX Ex Analog Module Features 2-7

Selecting a 1797-OE8 FLEX Ex Analog Output Module’s Operating Features

All features of the 1797-OE8 analog output module are independently
configurable in two four-channel groups (channel 0-3 & channel 4-7).

IMPORTANT

The default selection value for all parameters is 0.

Output Enable

The Output Enable feature provides user control of the FLEX Ex I/O
module’s output channels.

At power-up, the ControlNet Ex adapter (1797-ACNR15) and the
FLEX Ex I/O modules use a default state of no communications over the
network. Use your programming software to change the Output Enable
bit to 1 to begin communications over the network.

If network communication is ever lost during normal operations, the adapter
resets the Output Enable bit to 0, and any connected I/O modules execute
their fault routine, including transitioning to fault state and setting outputs to a
user-defined fault state. When network communications resume, the adapter
sets the Output Enable bit to 1 and normal I/O operations continue.

Local Fault Mode

The Local Fault Mode can be programmed to determine how the module
responds to communications faults and internal module faults.

When setting the Local Fault Mode feature in your programming software, set
this feature’s bit to 0 to use the analog fault state or digital fault state only if a
communications fault occurs. Set the bit to 1 to use the analog fault state or
digital fault state if any fault occurs.

Publication 1797-6.5.1 - May 2005

2-8 Understanding Configurable FLEX Ex Analog Module Features

Latch Retry Mode

Latch Mode determines channel operation under wire off or lead break fault
conditions. This feature controls the operation of two channel groups,
channels 0-3 and channels 4-7. Channel detection occurs on a continuous
basis. If a fault is detected, the channel fault alarm is set.

If Latch Mode is enabled when a fault occurs, the fault will remain latched in
its fault state until a Global Reset (see below) is issued. If Latch Mode is
disabled when a fault occurs, the channel reports a fault until the fault is
corrected. Global Reset is not necessary if Latch Mode is disabled.

When using your programming software, set the Latch Mode bit to 0 to
disable the feature. Set the bit to 1 to enable it.

Global Reset

Global Reset works in conjunction with Latch Mode during fault conditions. If
Latch Mode is enabled and a fault condition occurs, the channel operating with
a fault remains in this condition (with analog or digital fault state implied) until
a Global Reset is issued. The Global Reset feature resets all outputs of a
particular channel group to accept normal system output data.

The Global Reset feature is an edge triggered signal. Use your programming
software to set the Global Reset bit to 1 for normal operation. Resetting of
outputs occurs during the 1 to 0 transition.

Analog Digital State

You can configure your FLEX Ex analog I/O modules to work in an analog
mode or digital mode using the Analog Digital State feature. Depending on
which state you choose for your application, additional parameters (see the
descriptions of Analog Fault State and Digital Fault State on page 2-9) must be
configured for your module to react to fault conditions.

Set the Analog Digital State bit in your programming software to 0 for your
module to operate in an analog state. Set the bit to 1 for your module to
operate in a digital state. A selection bit is available to each channel.

Publication 1797-6.5.1 - May 2005

Understanding Configurable FLEX Ex Analog Module Features 2-9

Analog Fault State

The Analog Fault State feature determines how your I/O module reacts to
faults when a channel is used in analog mode. After a fault condition occurs,
the module may got to minimum value, maximum value, hold last state or 50%
of range.

Use your programming software to set the Analog Fault State bits on the
I/O module for one of the following fault reactions:

• 0 = minimum value

• 1 = maximum value

• 2 = hold last state

• 3 = 50% of range

You can set these parameters independently for channels 0-1, 2-3, 4-5, 6-7.

Digital Fault State

The Digital Fault State feature determines how your I/O module reacts to
faults when a channel is used in digital mode. After a fault condition occurs,
the module may reset channel outputs or hold last state of the outputs.

Use your programming software to set the Digital Fault State bit to 0 to reset
outputs. Set to 1 to hold last state of the outputs after a fault occurs. This
feature is available on a per channel basis.

Publication 1797-6.5.1 - May 2005

2-10 Understanding Configurable FLEX Ex Analog Module Features

Data Format

You must choose a module data format in your user prog ram. See Table 2.4 on
page 2-11 for an explanation of each bit. Data Formats 2, 5, 6, 8, 9, 10, 12 and
15 are not assigned.

When choosing a data format, remember the following:

• If a non-assigned Analog Data Format is selected, the module sets

Diagnostic Data to “2” for configuration failure and puts affected
channels affected in the corresponding fault state.

• An unconfigured module channel pair can be assumed to have the

default configuration Analog Data Format “0”, 0-20mA and Analog
Mode Fault State “minimum range”. If a non-assigned format is
selected, then the diagnostic “2” for configuration failure is set and the
module channel pair goes to the default fault state minimum range.

• If on the other hand, the configuration had been changed, from the

default, and then it was changed again to a non-assigned format, then
the diagnostic bit “2” for configuration failure is set and the module
goes to the fault state for the last valid configuration.

• Formats 13 and 14 are 2’s complement data formats, and require data to

the module in that form.

• Range: 0-15, See Table 13

• Default: 0

• Data Table Reference: data format, word 12 and 13, bits 0-3, bits 4-7

If data is sent to the module which is out of range, the value will be clipped
and Diagnostic Data will be set to “11” data out of range. See the graphic
below.

datatable

20.000

16.000

12.000

8.000

4.000

Diagnostic Data error
11=data out of range

Publication 1797-6.5.1 - May 2005

Diagnostic Data error
11=data out of range

0.000

-4.000
0 4 8 12 16 20 24

Output mA

Understanding Configurable FLEX Ex Analog Module Features 2-11

(

)

(

)

(

)

(

)

(

)

Table 2.4 1797-OE8 Data Formats

Data
Format

0 mA as

1 % as

2 0-20mA 0-22mA not assigned

3 unsigned

4 mA as

5 4-20mA 4-20mA not assigned

Format Resolution Full

Output
Range

0-20mA

0-20mA

integer as
0-20mA

4-20mA

0.1% of
0-20mA

0.2% of
0-20mA

0.03% of
0-20mA

0.1% of
4-20mA

0-22mA 0-22000

0-22mA 0-11000

0-20mA 0-65,535

2-22mA 2000-22000

Module Data Processing Data Table Value

output =

output = 20

output = 20

output =

datatable

1,000

datatable

10,000

datatable

65,535

datatable

1,000

(Interpretation)

(0-22.000mA)

(0-110.00%)

(0-22mA)

(2.000-22.000mA)

Count
per mA

1000 min=0mA

500 min=0mA

3276 min=0mA

1000 min=2mA

Analog Fault
State

max=22mA
hold
last=hold
50%=11mA

max=22mA
hold
last=hold
50%=11mA

max=20mA
hold
last=hold
50%=10mA

max=22mA
hold
last=hold
50%=12mA

6 4-20mA 4-20mA not assigned

7 unsigned

integer as
4-20mA

8 0-20mA 0-20mA not assigned

9 0-20mA 0-20mA not assigned

0.03% of
4-20mA

4-20mA 0-65,535

output = 16

datatable

65,535

+ 4

(4-20mA)

4095 min=4mA

max=20mA
hold
last=hold
50%=12mA

Publication 1797-6.5.1 - May 2005

2-12 Understanding Configurable FLEX Ex Analog Module Features

(

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(

)

(

)

Table 2.4 1797-OE8 Data Formats

Data
Format

10 0-20mA 0-20mA not assigned

11 D/A count

12 4-20mA not assigned

13 % as

14 % as

15 4-20mA 4-20mA not assigned

Format Resolution Full

Output
Range

as 0-20mA

4-20mA

4-20mA

0.28% of
0-20mA

0.16% of
4-20mA

0.16% of
4-20mA

0-22mA 0-8000

3-21mA -625 - +10625

2-22mA -1250 - +11250

Module Data Processing Data Table Value

output = 22

output = 16

output = 16

datatable

8,000

datatable

10,000

datatable

10,000

+ 4

+ 4

(Interpretation)

(0-22mA)

( 2 ’ s c o m p l e m e n t )
(-6.25% ­+106.25%)

( 2 ’ s c o m p l e m e n t )
(-12.50% ­+112.50%)

Count
per mA

363 min=0mA

625 min=3mA

625 min=2mA

Analog Fault
State

max=22mA
hold
last=hold
50%=11mA

max=21mA
hold
last=hold
50%=12mA

max=22mA
hold
last=hold
50%=12mA

Fault Alarm

Fault Alarm selects whether the channel pair fault detection is enabled or
disabled. There is a 100Hz (10ms) filter for wire off/lead break detection.

Use your programming software to set the Fault Alarm. Set the feature bit
to 0 to disable the alarm. Set the bit to 1 to enable wire off/lead break
fault detection.

Publication 1797-6.5.1 - May 2005

Understanding Configurable FLEX Ex Analog Module Features 2-13

Understanding Image Table Mapping and Bit/Word Descriptions

Bit Descriptions

Use the table below to understand bits used in image table mapping and
bit/word descriptions. Complete definitions of these feature documented
below can be found in Chapter 2.

Table 2.5 Bit/Word Descriptions

Bit: (s): Location: Definition:

Ch 1797-IE8 and -IE8NF Input and output maps

1797-OE8 Input and output maps

Ovr Alm 1797-IE8 and -IE8NF Input map Overrange Alarm

Und Alm 1797-IE8 and -IE8NF Input map Underrange Alarm

Rm Flt 1797-IE8 and -IE8NF Input map Remote Fault

Lo Flt 1797-IE8 and -IE8NF Input map Local Fault

Res Flg 1797-IE8 and -IE8NF Input map

1797-OE8 Input map

Out Enbl 1797-OE8 Output map Output Enable

U/D 1797-IE8 and -IE8NF Output map Up/down

Flt Md 1797-IE8 and -IE8NF Output map Fault Module

Cd Flg 1797-IE8 and -IE8NF Output map

1797-OE8 Output map

Channel

Response Flag

Command Flag

Flt Alm 1797-OE8 Input map Fault Alarm

Glbl Rst 1797-OE8 Output map Global Reset

Lo Flt Md 1797-OE8 Output map Local Fault Module

Alg Flt Ste 1797-OE8 Output map Analog Fault State

Lth Rty 1797-OE8 Output map Latch Retry

Dig Flt Ste 1797-OE8 Output map Digital Fault State

Alg Dig Md 1797-OE8 Output map Analog Digital Module

Diagnostic
Status

1797-IE8 and -IE8NF Input map
1797-OE8 Input map

Diagnostic Status

Publication 1797-6.5.1 - May 2005

2-14 Understanding Configurable FLEX Ex Analog Module Features

Analog Input Modules (1797-IE8 and -IE8NF) Image Table
Mapping

Table 2.6 Input Map (Read Words)

Bit

→

Word

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

↓

Read

0 Channel 0 Input Data
1 Channel 1 Input Data
2 Channel 2 Input Data
3 Channel 3 Input Data
4 Channel 4 Input Data
5 Channel 5 Input Data
6 Channel 6 Input Data
7 Channel 7 Input Data

Und

Und

Und

Und

Und

Und

Ovr

Ovr

Ovr

Ovr

Ovr

Ovr

Alm

ch

7

Flt
ch

7

Ovr

Alm

ch

6

Rm

Flt
ch

6

Alm

ch

5

Rm

Flt
ch

5

Alm

ch

4

Rm

Flt
ch

4

Alm

ch

3

Rm

Flt
ch

3

Alm

ch

2

Rm

Flt
ch

2

Alm

ch

1

Rm

Flt
ch

1

Alm

ch

0

Rm

Flt
ch

0

Alm

ch

7

Lo
Flt
ch

7

Alm

ch

6

Lo
Flt
ch

6

Alm

ch

5

Lo
Flt
ch

5

Alm

ch

4

Lo
Flt
ch

4

Alm

ch

3

Lo
Flt
ch

3

Alm

ch

2

Lo
Flt
ch

2

8Ovr

9Rm

10 Diagnostic Status
11 Res

Module command response Module response data

Flg

Where: ch = channel

Ovr Alm = Overrange Alarm
Und Alm = Underrange Alarm
Rm Flt = Remote Fault
Lo Flt = Local Fault
Res Flg = Response Flag

Und
Alm

ch

1

Lo
Flt
ch

1

Und
Alm

ch

0

Lo
Flt
ch

0

Table 2.7 Output Map (Write Words)

Bit →

Word

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

↓

0 High and Low Error Level U/D

1 High and Low Error Level U/D

2Cd

Module command Module command data

Flg

Where: Out Enbl = Output Enable

U/D = up/down
Flt Md = Fault Module
Cd Flg = Command Flag

Publication 1797-6.5.1 - May 2005

0-3

0-3

Write

Filter Cutoff 0-3 Data Format Flt

Md

Filter Cutoff 0-3 Data Format Flt

Md

Understanding Configurable FLEX Ex Analog Module Features 2-15

Bit/Word Description for the Analog Input Modules
(1797-IE8 and -IE8NF)

Table 2.8 Fault Mode - Write Words 0 and 1

Word 0 Bit 00 Fault enable for channels 0-3
Word 1 Bit 00 Fault enable for channels 4-7

Where: 0 = disabled

1 = enable with wire-off and overload or short circuit

Table 2.9 “Add-On” Filter Selections - Write Words 0 and 1

Word Bits Description

0 070605Channels 0-3
1 070605Channels 4-7

000

001

010

0 1 1 10Hz (100ms)
1004Hz (250ms)
1012Hz (500ms)
1101Hz (1s)

1110.5Hz (2s)

(1)

1797-IE8NF is reserved.

Hardware filtering only (default filtering)

40Hz (25ms)

20Hz (50ms)

(1)

(1)

(1)

Table 2.10 Remote Transmitter Error Up/Down - Write Words 0 and 1

Word 0 Bit 08 Up/down channels 0-3
Word 1 Bit 08 Up/down channels 4-7

Where: 0 = remote fault is enabled by transmitter overrange

1 = remote fault is enabled by transmitter underrange

Publication 1797-6.5.1 - May 2005

2-16 Understanding Configurable FLEX Ex Analog Module Features

Table 2.11 Data Format - Write Words 0 and 1

Bits Description

Word 0 04030201Data format for channels 0-3
Word 1 04030201Data format for channels 4-7

00000-22mA, w/error steps (default)
00010-22mA = 0 to 110%, w/error steps
00100-22mA = 0 to 104.8%, square root, w/error steps
00110-22mA = 0 to 65,535, unsigned integer, w/error steps
01002-22mA, w/error steps
01012-22mA = -12.5% to 112.5%, w/error steps
01104-22mA = 0 to 106%, square root, w/error steps
01114-20mA = 0 to 65,535, unsigned integer, w/error steps
1000Not assigned
1001Not assigned
1010Not assigned
10110-22mA = A/D count, w/fixed error

11003.6-21mA = NAMUR NE 43, w/fixed error
11013-21mA = -6.25 to 106.28% w/fixed error
11102-22mA = -12.5 to 112.5% w/fixed error
1111Not assigned

Table 2.12 Error Level 0.1mA Steps

Bit →

Word

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

↓

0Flt

Alm
ch7

1Res

Flg

Where: ch = channel

Flt Alm = Fault Alarm
Res Flg = Response Flag

Bits Description

Word 0 131211109 Error level channels 0-3
Word 1 131211109 Error level channels 4-7

00000Disabled

0.1mA * step value = remote fault alarm threshold
Examples

Data
Format
2-22mA

-12.5 to

112.5%

00111Step value = 7, 0.1mA * 7 = 0.7mA

Remote fault alarm at -4.38% or +104.38%

01111Binary value = 15, 0.1mA * 15 = 1.5mA

Remote fault alarm at -9.38% or + 109.38%

Analog Output Module (1797-OE8) Image Table Mapping

Table 2.13 Input Map (Read Words)

Flt

Flt

Flt

Flt

Flt

Flt
Alm
ch6

Flt

Alm

Alm

Alm

Alm

Alm

Alm

ch5

ch4

ch3

ch2

ch1

ch0

MODULE Command Response MODULE Response Data

Diagnostic Status

Publication 1797-6.5.1 - May 2005

Understanding Configurable FLEX Ex Analog Module Features 2-17

Bit/Word Descriptions for the Analog Output Module
(1797-OE8)

Table 2.14 Output Map (Write Words)

→

Bit

Word

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

↓

0Out

Enbl

Glbl

Rst

RESERVED Dig

1 Channel 0 Output Data

2 Channel 1 Output Data

3 Channel 2 Output Data

4 Channel 3 Output Data

5 Channel 4 Output Data

6 Channel 5 Output Data

7 Channel 6 Output Data

8 Channel 7 Output Data

9Lo

Flt

Md

10 Lth

Rty

4-7

Lth
Rty

0-3

Flt

Md

ch

2-3

Flt

Md

ch

6-7

Flt

Md

ch

0-1

Flt

Md

ch

4-5

Alg Flt

Ste

ch2-3

Alg Flt

Ste

ch6-7

Alg Flt

Ste

ch0-1

Alg Flt

Ste

ch4-5

Out

ch7

Dig

Dig

Out

Out

ch6

ch5

Data Format

ch2-3

Data Format

ch6-7

Dig
Out

ch4

Dig
Out

ch3

Dig

Dig

Out

Out

ch2

ch1

Data Format

ch0-1

Data Format

ch4-5

Dig
Out

ch0

11 Dig

Flt

Ste

ch7

12 Cd

Flg

Where: ch = channel

Dig Out = Digital Output
Lo Flt Md = Local Fault Mode
Flt Md = Fault Mode
Alg Flt Ste = Analog Fault State
Lth Rty = Latch Retry
Dig Flt Ste = Digital Fault State
Alg Dig Md = Analog/Digital Mode
Out Enbl = Output Enable
Glbl Rst = Global Reset

Dig

Flt

Ste

ch6

Dig

Dig

Dig

Dig

Dig

Dig

Alg

Alg

Alg

Alg

Flt

Flt

Flt

Flt

Flt

Flt

Dig

Dig

Dig

Dig

Ste

Ste

Ste

Ste

Ste

Ste

Md

Md

Md

Md

ch5

ch4

ch3

ch2

ch1

ch0

ch7

ch6

ch5

ch4

MODULE Command MODULE Command Data

Alg

Alg

Alg

Alg

Dig

Dig

Dig

Dig

Md

Md

Md

Md

ch3

ch2

ch1

ch0

Publication 1797-6.5.1 - May 2005

2-18 Understanding Configurable FLEX Ex Analog Module Features

Table 2.15 Data Format Control

Data
Format

00000-20mA 0.1% of

00010-20mA 0.2% of

00100-20mA 0-20mA not assigned
00110-20mA 0.03% of

01004-20mA 0.1% of

01014-20mA 4-20mA not assigned
01104-20mA 4-20mA not assigned
01114-20mA 0.03% of

10000-20mA 0-20mA not assigned
10010-20mA 0-20mA not assigned
10100-20mA 0-20mA not assigned
10110-20mA 0.28% of

11004-20mA not assigned
11014-20mA 0.16% of

11104-20mA 0.16% of

11114-20mA 4-20mA not assigned

Range Resolution Full

Range

0-22mA 0-22mA 0-22000 1000

0-20mA

0-22mA 0-110% 0-11000 500

0-20mA

0-20mA unsigned

0-20mA

2-22mA 2-22mA 2000-

4-20mA

4-20mA unsigned

4-20mA

0-22mA D/A count 0-8000 363

0-20mA

3-21mA -6.25 to

4-20mA

2-22mA -12.5 to

4-20mA

Interpretation Data Table

integer

integer

+106.25%

+112.5%

Count per

Value

0-65,535 3276

22000

0-65,535 4095

-625 to
+10625

-1250 to
+11250

mA

1000

625

625

Chapter Summary

Publication 1797-6.5.1 - May 2005

In this chapter, we told you about the FLEX Ex system and the analog I/O
modules, and how they communicate with programmable controllers. Move to
Chapter 3 to learn how to install your FLEX Ex analog module.

Chapter

3

How to Install Your FLEX Ex Analog Modules

What this Chapter Contains

Before You Install Your Analog Module

Read this chapter to install the input and output analog modules.

For information on: See page:

Before You Install Your Analog
Module

Compliance to European Union
Directives

Installation in Zone 1 3-3

Removal and Insertion Under Power 3-4

Installing the Module 3-4

Connecting Wiring to the FLEX Ex I/O
Analog Modules

Grounding the Module 3-14

Chapter Summary 3-14

Before installing your FLEX Ex analog module:

Table 3.1 Steps to Complete Before Installation

You need to: As described under:

3-1

3-2

3-11

Verify that the module will be installed in a
suitable metal enclosure

Position the keyswitch on the
terminal base

ATTENTION

1 Publication 1797-6.5.1 - May 2005

These modules do not receive primary operational power
from the backplane. +/-V dc power must be applied to
your module before installation. If power is not applied, the
module position will appear to the adapter as an empty slot
in your chassis.

Installation in Zone 1, page 3-3

Installing the Module, page 3-9

3-2 How to Install Your FLEX Ex Analog Modules

Compliance to European Union Directives

If these products have the CE mark they are approved for installation within
the European Union and EEA regions. They have been designed and tested to
meet the following directives.

EMC Directive

These products are tested to meet the Council Directive 89/336/EC
Electromagnetic Compatibility (EMC) as amended by 92/31/EC and
93/68/EEC, by applying the following standards:

• EN61000-6-4:2001, Electromagnetic Compatibility (EMC) - Part 6-4:

Generic Standard for Industrial Environments (Class A)

• EN61000-6-2:2001, Electromagnetic Compatibility (EMC) - Part 6-2:

Generic Standards - Immunity for Industrial Environments

• EN61326-1997 + A1-A2, Electrical Equipment For Measurement,

Control, and Laboratory Use - Industrial EMC Requirements

ATEX Directive

These products are tested in conjunction with associated I/O modules to meet
the Council Directive 94/9/EC (ATEX) Equipment and Protective Systems
Intended for Use in Potentially Explosive Atmospheres by applying the
following standards:

• EN50014:1997 + A1-A2, Electrical Apparatus for Potentially Explosive

Atmospheres

• EN50020:1994, Electrical Apparatus for Potentially Explosive

Atmospheres - Intrinsic Safety “i”

• EN50284:1999, Special Requirements for Construction, Test and

Marking of Electrical Apparatus of Equipment Group II, Category 1G

• EN50281-1-1:1998 + A1, Electrical Apparatus for Use in the Presence

of Combustible Dust - Part 1-1: Protection by Enclosure

Publication 1797-6.5.1 - May 2005

How to Install Your FLEX Ex Analog Modules 3-3

Installation in Zone 1

Installation in Zone 22

These modules must not be exposed to the environment. Provide a suitable
metal enclosure. These modules have a protection factor of IP20.

WARNING

When the module is installed in Zone 22, the following cabinets must be used:
IVK-ISRPI-V16LC; IVK-ISRPI-V8HYW; or IVK-ISRPI-V8LC. These
cabinets can be purchased from:

Pepperl+Fuchs GmbH
Konigsberger Allee 85-87, D-68307
Mannheim, Germany
Attn: PA Sales Dept.
Kirsten Becker
Telephone [phone]
www.pepperl-fuchs.com

These modules cannot be used in an intrinsically safe
environment after they have been exposed to
non-intrinsically safe signals.

Electrostatic Charge

The IS-RPI cabinets (type IVK2-ISRPI-V8LC, IVK2-ISRPI-V8HYW, or
IVK-ISRPI-V16LC) ensures the basic protection for the intrinsically safe
apparatus of the IS-RPI system for use in Zone 22. It corresponds with
category 3D according to RL 94/9 EG and with the type label marked with
the following information:

Pepperl+Fuchs GmbH
68301 Mannheim
IVK2-ISRPI-V8LC (or IVK2-ISRPI-V8HYW or IVK-ISRPI-V16LC)

II 3D IP54 T 70°C
CE
Serial (manufacturing) number
Model

Protect the system against electrostatic charge. Post a sign near this module:
Attention! Avoid electrostatic charge. For your convenience, a sign which
can be cut out and posted is included in this user manual before the back
cover.

Publication 1797-6.5.1 - May 2005

3-4 How to Install Your FLEX Ex Analog Modules

Removal and Insertion Under Power

Installing the Module

WARNING

Installation of the analog module consists of:

• mounting the terminal base unit

• installing the analog I/O module into the terminal base unit

These module are designed so you can remove and insert
them under power. However, take special care when
removing or inserting these modules in an active process.
I/O attached to any module being removed or inserted can
change states due to its input/output signal changing
conditions.

If you insert or remove the terminal base while backplane
power is on, an electrical arc can occur. This could cause an
explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous
before proceeding.

• 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 Modules on the Terminal Base”
on page 9.

ATTENTION

Make certain that you power this terminal base module
combination with an instrinsically safe power supply. Do not
exceed the values listed in the specifications for the terminal
base or module.

Do not use the unused terminals on the terminal base unit.
Using the terminals as supporting terminals can result in
damage to modules and/or unintended operation of your
system.

Publication 1797-6.5.1 - May 2005

Mounting on a DIN Rail

How to Install Your FLEX Ex Analog Modules 3-5

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 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. Make certain that the female flexbus connector is fully retracted into
the base unit.

4. Position the terminal base over the 35 x 7.5mm DIN rail A
(A-B pt. no. 199-DR1).

A

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

A

41106

Publication 1797-6.5.1 - May 2005

3-6 How to Install Your FLEX Ex Analog Modules

41107

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.

ATTENTION

Do not force the terminal base into the adjacent modules.
Forcing the units together can bend or break the hook and
allow the units to separate and break communication over
the backplane.

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.

41108

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 1797-6.5.1 - May 2005

41109

Gently push the flexbus connector into the side of the adapter (or proceeding
terminal base) to complete the backplane connection.

How to Install Your FLEX Ex Analog Modules 3-7

6. For specific wiring information, refer to the installation instructions for
the module you are installing in this terminal base unit. Terminal
assignments are also given later in this chapter, see page 3-11.

7. Repeat the above steps to install the next terminal base.

8. Be sure the flexbus connector cover on the last terminal base is in place.

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

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)

• 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 Modules on the Terminal Base Unit
on page 3-9.

Use the mounting kit Cat. No. 1794-NM1 for panel/wall mounting.

1.4

(35.5)

1

2

41547

Terminal Base Unit
(not included)

Publication 1797-6.5.1 - May 2005

3-8 How to Install Your FLEX Ex Analog Modules

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/Wall Mounting of FLEX Ex I/O

.83 (21)

2.0

(50)

Inches

(Millimeters)

!

1.4

(35.5)

2.3

(58.5)

1.4

(35.5)

ATTENTION: Be careful of metal chips when
drilling cable mounting holes. Do not drill holes
above a system that has any modules installed.

2.3

(58.5)

Cable length

approximately 11.5

(292.1) or 35.5

(901.0) from upper

connector [length

depends upon

cable -1ft (0.3m) or

3ft (0.091m)]

1.4

(35.5)

1.6

(40.5)

.61

(15.6)

+V

1

2

.3

(8)

-V

+V

-V

3

4

40871

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).

IMPORTANT

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 (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.

Publication 1797-6.5.1 - May 2005

How to Install Your FLEX Ex Analog Modules 3-9

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.

Mounting the Analog Modules on the Terminal Base Unit

The analog input and output modules mount on a 1797-TB3 or TB3S
intrinsically safe terminal base unit.

1. Rotate keyswitch (1) on terminal base unit (2) clockwise to position 3 for
the 1797-IE8 or -IE8NF or position 4 for the 1797-OE8 as required for
each type of module. Do not change the position of the keyswitch

after wiring the terminal base unit.

7

4

Label under here
or under here

3

5

1

8

2

6

40231

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.

Publication 1797-6.5.1 - May 2005

3-10 How to Install Your FLEX Ex Analog Modules

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.

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.

6. Make certain that you only connect terminal base units to other
intrinsically safe system modules or adapters to maintain the integrity of
the intrinsically-safe backplane.

7. Remove cap plug (8) and attach another intrinsically safe terminal base
unit to the right of this terminal base unit if required. Make sure the last
terminal base has the cap plug (8) in place.

Wiring the Terminal Base Units

41307

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

Wiring the FLEX Ex I/O analog modules is done through the 1797-TB3 and
1797-TB3S terminal base units.

ATTENTION

The FLEX Ex analog I/O modules do not receive primary
operational power from the backplane. +/-V dc power
must be applied to your module before operation. If power
is not applied, the module position will appear to the
adapter as an empty slot in your chassis. If the adapter does
not recognize your module after installation is completed,
cycle power to the adapter.

Make certain that you power these modules with an
intrinsically safe power supply. Do not exceed the values
listed in the specifications for the modules.

Publication 1797-6.5.1 - May 2005

How to Install Your FLEX Ex Analog Modules 3-11

Connecting Wiring to the FLEX Ex I/O Analog Modules

Inputs/Outputs

Each 1797-IE8 or -IE8NF input can be operated from an analog field device
signal, and each 1797-OE8 output channel can operate an analog field device.
Do not apply any non-intrinsically safe signals to these modules.

IMPORTANT

When using an intrinsically safe electrical apparatus
according to EN50020, the European Community
directives and regulations must be followed.

The channels of the 1797-IE8 and -IE8NF are electrically connected to each
other and have a common plus-line. The channels of the 1797-OE8 are
electrically connected to each other.

IMPORTANT

When interconnecting several lines, you must consider the
total accumulated power and check for intrinsic safety.

Connections for the 1797-IE8 and -IE8NF Modules

Row B

Row A

Row C

+V

-V

4-20mA

flexbus

10 2 3 4 5 6 7 8 9 1011121314 15

Ch 0Ch 1Ch 2Ch 3

Ch 4 Ch 5 Ch 6 Ch 7

+V +V–V –V

Bus

uC

1797-IE8 or -IE8NF Module

91Ω
17V

+ sig –+ sig –+ sig –

+

sig

22Ω

-

+ sig –

28 29 30 31 32 3322 23 24 25 26 2716 17 18 19 20 21

+ sig –+ sig –+ sig –+ sig –

46 47 48 49 50 5140 41 42 43 44 4534 35 36 37 38 39

4-20mA

Xmit

Xmit

I

I

PP

40072

40071

No connection
allowed

No connection
allowed

Publication 1797-6.5.1 - May 2005

3-12 How to Install Your FLEX Ex Analog Modules

For Two-Wire Transmitter Devices

1. Connect the individual input wiring to (+) terminals (0, 4, 8, 12) on the
0-15 row (A) and on the 16-33 row (B) (terminals 17, 21, 25, 29) as
indicated in the table below.

2. Connect the associated input to the corresponding (sig) terminal (1, 5, 9,

13) on the 0-15 row (A), and on the 16-33 row (B) (terminals 18, 22, 26,

30) for each input as indicated in the table below.

3. Connect +V dc power to terminal 34 on the 34-51 row (C).

4. Connect -V to terminal 35 on the 34-51 row (C).

5. If continuing power to the next terminal base unit, connect a jumper

from terminal 50 (+V) on this base unit to terminal 34 on the next base
unit.

6. If continuing common to the next terminal base unit, connect a jumper
from terminal 50 (-V) on this base unit to terminal 35 on the next base
unit.

Table 3.2 Wiring connections for the 1797-IE8 and -IE8NF Modules

Input Input

Source

Input 0 A-0 A-1 A-2 Input 4 B-17 B-18 B-19

Input 1 A-4 A-5 A-6 Input 5 B-21 B-22 B-23

Input 2 A-8 A-9 A-10 Input 6 B-25 B-26 B-27

Input 3 A-12 A-13 A-14 Input 7 B-29 B-30 B-31

+V Terminals 34 and 50

-V Terminals 35 and 51

Terminals 16, 33, 40, 41, 42, 43, 44 and 45 are connected to chassis ground.

ATTENTION

Input
Signal

Input
Return

Input Input

Source

Input
Signal

Input
Return

Do not use the unused terminals on the terminal base unit.
Using these terminals as supporting terminals can result in
damage to the module and/or unintended operation of
your system.

Publication 1797-6.5.1 - May 2005

Connections for the 1797-OE8 Module

flexbus

Bus

How to Install Your FLEX Ex Analog Modules 3-13

+V

power
supply

-V

+

4-20mA
valve

uC

1797-OE8 Module

Row A

Row B

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

+- + - +- +-

ch0

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

++++----

ch4 ch5 ch6

34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Row C

+V +V-V -V

No connections allowed to terminals 2, 3, 6, 7, 10, 11, 14, 15, 19, 20, 23,
24, 27, 28, 31, 32, 36, 37, 38, 39, 46, 47, 48, 49

ch1 ch2 ch3

-

ch7

1. Connect the individual output wiring to (+) terminals (0, 4, 8, 12) on the
0-15 row (A) and on the 16-33 row (B) (terminals 17, 21, 25, 29) as
indicated in the table below.

4-20mA
actuator

41441

41440

2. Connect the associated output to the corresponding (-) terminal (1, 5, 9,

13) on the 0-15 row (A), and on the 16-33 row (B) (terminals 18, 22, 26,

30) for each input as indicated in the following table.

3. Connect +V dc power to terminal 34 on the 34-51 row (C).

4. Connect -V to terminal 35 on the 34-51 row (C).

5. If continuing power to the next terminal base unit, connect a jumper

from terminal 50 (+V) on this base unit to terminal 34 on the next base
unit.

6. If continuing common to the next terminal base unit, connect a jumper
from terminal 51 (-V) on this base unit to terminal 35 on the next base
unit.

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3-14 How to Install Your FLEX Ex Analog Modules

Table 3.3 Wiring connections for the 1797-OE8 Module

Output Output + Output – Output Output + Output –

Output 0 A-0 A-1 Output 4 B-17 B-18

Output 1 A-4 A-5 Output 5 B-21 B-22

Output 2 A-8 A-9 Output 6 B-25 B-26

Output 3 A-12 A-13 Output 7 B-29 B-30

+V Terminals 34 and 50

-V Terminals 35 and 51

Terminals 16, 33, 40, 41, 42, 43, 44 and 45 are connected to chassis ground.

Grounding the Module

ATTENTION

Do not use the unused terminals on the terminal base unit.
Using these terminals as supporting terminals can result in
damage to the module and/or unintended operation of
your system.

All I/O wiring must use shielded wire. Shields must be terminated external to
the module, such as bus bars and shield-terminating feed throughs.

Chapter Summary

Publication 1797-6.5.1 - May 2005

30820

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

Move to chapter 4 to learn about input, output and configuration files for the
analog I/O modules on ControlNet.

Chapter

Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network

4

What this Chapter Contains

Read this chapter to familiarize yourself with input, output and configuration
files for analog I/O modules on ControlNet.

For information on: See page:

Using Programming Software in Your
FLEX Ex Application

About the ControlNet Ex Adapter 4-2

Communication Over the FLEX Ex
Backplane

I/O Structure 4-4

Fault State Data 4-6

Device Actions 4-6

Chapter Summary 4-8

In this chapter, you will learn about:

• using software to configure the FLEX Ex I/O modules

• ControlNet Ex Adapter

• I/O structure

• fault state data

• communication fault data

• idle state behavior

• input data behavior upon module removal

This chapter provides a brief description of the steps you must take in
your programming software to configure
FLEX Ex I/O modules and an overview of what occurs during
configuration.

4-2

4-3

For a full explanation of how to use your programming software to
perform module configuration, use the software online help.

1797-6.5.1 - May

4-2 Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network

Using Programming Software in Your FLEX Ex Application

When using FLEX Ex I/O analog modules, you must perform I/O mapping
and configure the ControlNet network before generating configuration data
for your I/O modules.

For example, you may use RSNetWorx™ to connect FLEX Ex I/O modules
to a ControlNet processor or scanner through a FLEX Ex ControlNet Ex
adapter (cat. no. 1797-ACNR15). The I/O configuration portion of another
programming software, for example RSLogix5™ could be used to generate
the configuration data for each I/O module in the control system.

Configuration data is transferred from the controller to the I/O modules
when communication to the modules is first established.

Follow these general guidelines when configuring I/O modules:

1. Perform I/O mapping.

2. Configure all I/O modules.

3. Change to Run mode to initiate communication and download

4. module configuration.

About the ControlNet Ex Adapter

The FLEX Ex ControlNet Ex adapter interfaces up to 8 FLEX Ex modules to
a ControlNet processor or scanner. The adapter can support ControlNet
real-time data connections to individual modules or module groups. Each
connection is independent of the others and can be from different processors
or scanners.

Publication 1797-6.5.1 - May 2005

Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network 4-3

Communication Over the FLEX Ex Backplane

Networ

ControlNet Ex
Adapter

Write

One 1797-ACNR15/B ControlNet Ex adapter can interface up to eight
terminal base units with installed FLEX Ex modules, forming a FLEX Ex
system of up to eight slots.

The adapter communicates to other network system components (typically
one or more controllers or scanners, and/or programming terminals) over the
ControlNet network. The adapter communicates with its I/O modules over
the FLEX Ex backplane.

Read

I/O Module I/O ModuleI/O Module

Inputs Inputs Inputs

Status

Outputs

Configuration Configuration Configuration

Slot 0 Slot 1 Slot 7

0

Read
Words

Write
Words

X

StatusStatus

OutputsOutputs

Configuration data is not continuously updated to the module.

41626

Scheduled Data-Transfer

Scheduled data transfer:

• is continuous.

• is asynchronous to the controller program scan.

• occurs at the actual rate displayed in the Actual Packet Interval field on

the programming software ControlNet I/O mapping (monitor) screen

Unscheduled Data-Transfer

Unscheduled operations include:

• unscheduled non-discrete I/O data transfers–through ControlNet I/O

Transfer (CIO) instructions

• peer-to-peer messaging–through message (MSG) instructions

• messaging from programming devices

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4-4 Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network

Unscheduled messaging on a ControlNet network is non-deterministic. Your
application and your configuration–number of nodes, application program,
NUT, amount of scheduled bandwidth used, etc.–determine how much time
there is for unscheduled messaging.

Module I/O Mapping

The I/O map for a module is divided into read words and write words. Read
words consist of input and status words, and write words consist of output
and configuration words. The number of read words or write words can be 0
or more.

The length of each I/O module’s read words and write words vary in size
depending on module complexity. Each I/O module will support at least 1
input word or 1 output word. Status and configuration are optional, depending
on the module.

I/O Structure

Network READ

Network WRITE

Output data is received by the adapter in the order of the installed I/O
modules. The output data for slot 0 is received first, followed by the output
data for slot 1, and so on up to slot 7.

The first word of input data sent by the adapter is the Adapter status word.
This is followed by the input data from each slot, in the order of the installed
I/O modules. The input data from slot 0 is first after the status word, followed
by input data from slot 1, and so on up to slot 7.

ControlNet Adapter

Read Data

Adapter Status

Slot 0 Input Data

Slot 1 Input Data

Slot 7 Input Data

Slot 0 Output Data
Slot 1 Output Data

Read

Write

I/O

Module

Slot 0

I/O

Module

Slot 1

I/O

Module

Slot 7

Publication 1797-6.5.1 - May 2005

Slot 7 Input Data

41628

Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network 4-5

Adapter Status Word

The status word consists of:

• I/O module fault bits – 1 status bit for each slot

Additionally, in the case of a PLC-5 controller, it adds:

• node address changed – 1 bit (created by PLC-5 controller)

• I/O status – 1 bit (created by PLC-5 controller)

The following FLEX Ex adapter status word for a PLC-5 controller results.

I/O Module Fault Bits

Bit: 15 910 through 15 876543210

Created by PLC-5 controller

Bit Description: Bit: Explanation:

I/O Module Fault

Node Address Changed
(Created by PLC-5
controller.)

I/O Status Bit

Node Address Changed Bit

41629

As an example, in a PLC-5 system, the adapter status word bit descriptions are
shown in the following table.

Table 4.1 Adapter Status Word Bit Descriptions

0 This bit is set (1) when an error is detected in slot position 0.

1 This bit is set (1) when an error is detected in slot position 1.

2 This bit is set (1) when an error is detected in slot position 2.

3 This bit is set (1) when an error is detected in slot position 3.

4 This bit is set (1) when an error is detected in slot position 4.

5 This bit is set (1) when an error is detected in slot position 5.

6 This bit is set (1) when an error is detected in slot position 6.

7 This bit is set (1) when an error is detected in slot position 7.

8 This bit is set (1) when the node address switch setting has

been changed since power-up.

I/O State (Created by
PLC-5 controller.)

9Bit = 0 -idle

bit = 1 - run

10 though 15 Not used – set to 0

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4-6 Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network

Possible causes for an I/O Module Fault are:

• transmission errors on the FLEX Ex backplane

• a failed module

• a module removed from its terminal base

• incorrect module inserted in a slot position

• the slot is empty

• the slot contains a non-discrete module

Fault State Data

Device Actions

The ControlNet Ex adapter provides storage for alternate module output data
during communication faults or processor idle state. This “fault state data”
assures that a known output will be applied to the output devices during the
previously mentioned modes.

The processor or scanner software must include the means to specify this fault
state data for each module. If applicable, this data is sent in the configuration
block, see Image Table Mapping on page 2-13.

Device actions include:

• communication fault behavior

• idle state behavior

• input data behavior upon module removal

Publication 1797-6.5.1 - May 2005

Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network 4-7

Communication Fault Behavior

You can configure the adapter response to a communication fault for
each I/O module in its system. Upon detection of a communication fault,
the adapter can:

• leave the module output data in its last state (hold last state)

• reset the module output data to zero (reset)

• apply fault state data to the module output

IMPORTANT

If the Output Enable bit transitions from 1 to 0 (by
resetting the module output data or applying fault state
data), the module uses internal analog or digital fault state
bits, depending on user configuration, to determine the
state of the outputs.

Idle State Behavior

The ControlNet Ex adapter can detect the state of the controlling processor or
scanner. Only 2 states can be detected: run mode, or program mode (idle).

When run mode is detected, the adapter copies the output data received from
the processor to the corresponding module output. When program mode is
detected, the adapter can be configured to:

• leave the module output data in its last state (hold last state)

• reset the module output data to zero (reset)

• apply fault state data to the module output

If the Output Enable bit transitions from 1 to 0 (by resetting the module
output data or applying fault state data), the module uses internal analog or
digital fault state bits, depending on user configuration, to determine the
state of the outputs.

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4-8 Input, Output, and Configuration Files for the Analog I/O Modules on the ControlNet Network

Input Data Behavior upon Module Removal

I/O module input data sent by the adapter upon module removal is
configurable. The adapter can:

• reset the module input data sent by the adapter to zero (reset)

• leave the module input data sent by the adapter in the last state before

module removal (hold last state)

Chapter Summary

In this chapter you learned about input, output and configuration files for the
analog I/O modules on ControlNet. Move to Chapter 5 to learn how to
calibrate your module.

Publication 1797-6.5.1 - May 2005

Calibrating Your Module

Chapter

5

What This Chapter Contains

When and How to
Calibrate Your FLEX Ex

Use this chapter to calibrate the FLEX Ex analog I/O modules.

For information on: See page:

When and How to Calibrate Your FLEX Ex Analog I/O Module 5-1 Tools and Equipment 5-2 Using Calibration Module Command Words 5-2 Calibrating the Input Modules 5-6 Calibrating the Output Modules 5-8 Chapter Summary 5-10

IMPORTANT

In practice, you must use the I/O configuration portion of your programming
software to calibrate your modules. The software executes the methodology
explained here.

Your module is shipped to you already calibrated. If a calibration check is
required, the module must be in a FLEX Ex I/O system.

This chapter provides a detailed method to perform
module calibration with individual commands. This
discussion is only given here to explain the general process.

Analog I/O Module

1 Publication 1797-6.5.1 - May 2005

Perform module calibration periodically, based on your application. Module
calibration may also be required to remove module error due to aging of
components in your system.

ATTENTION

Your FLEX Ex analog I/O modules are intrinsically safe
equipment. This module cannot be used in instrinsically
safe environment after having been exposed to
non-intrinsically safe signals.

5-2 Calibrating Your Module

Use one of the following general methods to calibrate your module:

• Use intrinsically safe equipment to calibrate the module.

• Use factory trained personnel under controlled conditions to calibrate

the modules with non-intrinsically safe equipment to maintain your
module’s intrinsic safety certification.

Tools and Equipment

Using Calibration Module Command Words

ATTENTION

With the second method, extreme care must be exercised
by the calibration personnel to avoid compromising the
intrinsically safe characteristics or your modules. This
method may never be used in a hazardous environment.

To calibrate your analog I/O modules, you will need the following tools and
equipment:

Table 5.1 Tools for Calibration

Tool or Equipment: Description:

Precision Current
Source

Precision Current Meter 0-22mA, 0.01µA resolution Used for output modules

Industrial Terminal and
Interconnect Cable

0-22mA, 0.01µA resolution Used for input modules

Programming terminal for A-B family processors

Module calibration is supported by Module Command words. See your
module data tables in Chapter 3 to determine which words are the Module
Command words. They are always the last read word and last write word. The
Module Command word is broken into two parts the upper byte is the
command and the lower byte is the data.

R/W Bit

151413121110987654321 0

Write cmd

flag

Publication 1797-6.5.1 - May 2005

A CIO is used to structure a calibration command and submit it to the
network. This includes the command and any data.

Table 5.2 MODULE Command Word

MODULE calibration command MODULE calibration command data

Typical MODULE Calibration Command Word

The controller sends a MODULE calibration command word over the
network, onto the flexbus and to the module.

Table 5.3 Calibration Command Word

R/W Bit

151413121110987654321 0

write cmd

flag

write cmd

flag

Calibration All Channels sub-Command 0-255

Calibration By Channel Channel Select 0-15 sub-Command 0-15

The I/O module may do a number of things based on the particular
calibration command data sent by the controller. The table below shows the
general structure of calibration commands.

The calibration command structure instructs the module to calibrate individual
channels or to calibrate all channels at once. If all channels are to be calibrated
at once, a single calibration command is sent along with calibration command
data selecting the calibration type to be accomplished. If individual channels
are to be calibrated, again, a single calibration command is sent. The
calibration command data specifies the specific channel and calibration type to
be accomplished.

Calibrating Your Module 5-3

Table 5.4 General Calibration Command Structure

MODULE Calibration Command MODULE Calibration Command Data

Command Meaning Data (up nibble) Data (low

nibble)

channel command

0 Commands Idle x x command method is idle

1 No Operation x x no operation is required

4 General Calibration by Channel 0-7 0 zero min and max scale coefficients

0-7 1-15 not used

8-15 0-15 not used

5 Min Scale Calibration by

Channel

6 Max Scale Calibration by

Channel

0-7 0 input = 1mA

0-7 1-15 not used

8-15 0-15 not used

0-7 0 input = 21mA

0-7 1-15 not used

8-15 0-15 not used

Meaning

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5-4 Calibrating Your Module

36 Calibration all Channels

General Calibration all Channels 0 0 zero min scale and max scale coefficients

Min Scale Calibration all

Channels

Table 5.4 General Calibration Command Structure

0 1-15 not used

1 0 input = 1mA

1 1-15 not used

Max Scale Calibration all

Channels

2 0 input = 21mA

2 1-15 not used

3-15 0-15 not used

For example, based on the table below, command 4 0 0 asks for zeroing the
min and max coefficients of channel 0. All results are complete with this one

command.

Table 5.5 Example MODULE Calibration Commands and Data

R/W Bit

151413121110987654321 0

Read cmd

flag

MODULE command response MODULE response data

Once the slave completes the calibration command, the module echoes back
the command and data in the MODULE response word, see the General
MODULE Response Word below. The controller is informed the calibration
sequence is complete.

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General MODULE Response Word

Once the I/O module echoes the command and data it will not treat the
continued presence of the same calibration command as a signal to perform
that command again. If the user wants to perform the same calibration again, a
“No Operation” command must be sent from the controller to the module
first.

The following tables show typical command sequences.

Table 5.6 Typical All Channels Calibration Command Sequence

Host Command Sequence Slave Command Sequence

command

number

36 calib all chls,

36 calib all chls,

MODULE command MODULE data command

number

76543210 76543210

0 0 36 calib all chls,

zero min & max

1 0 36 calib all chls,

min scale

MODULE command

response

zero min & max

min scale

Calibrating Your Module 5-5

MODULE response

data

00

10

36 calib all chls,

max scale

0 Commands idle 0 0 0 Commands idle 0 0

Host Command Sequence Slave Command Sequence

command

number

4 calib ch0, zero min &

4 calib chl, zero min &

5 calib ch0, min scale 0 0 5 calib ch0, min scale 0 0

5 calib ch1, min scale 1 0 5 calib ch1, min scale 1 0

6 calib ch0, max scale 0 0 6 calib ch0, max scale 0 0

6 calib ch1, max scale 1 0 6 calib ch1, max scale 1 0

0 Commands idle 0 0 0 Commands idle 0 0

MODULE command MODULE data command

max

max

2 0 36 calib all chls,

max scale

Table 5.7 Typical Channel by Channel Calibration Command Sequence

MODULE command

number

76543210 76543210

0 0 4 calib ch0, zero min &

1 0 4 calib chl, zero min &

response

max

max

20

MODULE response

00

10

data

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5-6 Calibrating Your Module

Calibrating the Input Modules

Precision
Current
Sources

Precision
Current
Sources

Row B

To calibrate the 1797-IE8 or -IE8NF module use the following steps:

1. Attach the precision current source(s) to the module.

10 234 5678 9101112131415

Row A

+ sig –+ sig –+ sig –

Ch 0 Ch 1 Ch 2 Ch 3

Ch 4Ch 5Ch 6Ch 7

+ sig –

28 29 30 31 32 3322 23 24 25 26 2716 17 18 19 20 21

+ sig –+ sig –+ sig –+ sig –

41659

2. Send a message to the module instructing it to perform Zero Min and
Max Scale Coefficients.

3. Await an echo message from the module announcing that it has
performed Zero Min and Max Scale Coefficients.

4. Apply 1mA, (minimum scale calibration input(s),) to the module.

5. Send a message to the module instructing it to perform Min Scale
Calibration.

6. Await an echo message from the module announcing that it has
performed Min Scale Calibration.

7. Apply 21mA, (maximum scale calibration input(s),) to the module.

8. Send a message to the module instructing it to perform Max Scale
Calibration.

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Calibrating Your Module 5-7

9. Await an echo message from the module announcing that it has
performed Max Scale Calibration.

10. After all channels are calibrated, send a message to the module
instructing it to go to Commands Idle state.

The following table shows the calibration MODULE command definitions.

Table 5.8 MODULE Command Definitions

MODULE Calibration Command MODULE Calibration Command Data

Command Meaning Data (up nibble) Data (low nibble) Meaning

channel command

0 Commands Idle x x command method is idle

1 No Operation x x no operation is required

4 General Calibration by Channel 0-7 0 zero min and max scale coefficients

0-7 1-15 not used

8-15 0-15 not used

5 Min Scale Calibration by

Channel

0-7 0 input = 1mA

0-7 1-15 not used

6 Max Scale Calibration by

Channel

36 Calibration all Channels

General Calibration all Channels 0 0 zero min scale and max scale coefficients

Min Scale Calibration all

Channels

Max Scale Calibration all

Channels

8-15 0-15 not used

0-7 0 input = 21mA

0-7 1-15 not used

8-15 0-15 not used

0 1-15 not used

1 0 input = 1mA

1 1-15 not used

2 0 input = 21mA

2 1-15 not used

3-15 0-15 not used

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5-8 Calibrating Your Module

Calibrating the Output Modules

Precision
Current
Sources

Precision
Current
Sources

Row B

To calibrate the 1797-OE8 module use the following general method:

1. Attach the precision current meters(s) to the module.

10 234 5678 9101112131415

Row A

+ sig –+ sig –+ sig –

Ch 0 Ch 1 Ch 2 Ch 3

Ch 4 Ch 5 Ch 6 Ch 7

+ sig –

28 29 30 31 32 3322 23 24 25 26 2716 17 18 19 20 21

+ sig –+ sig –+ sig –+ sig –

41660

2. Send a message to the module to set its Output Enable bit to 1. This
enables its outputs.

3. Send a message to the module instructing it perform Zero Min and
Max Scale Coefficients.

4. Await an echo message from the module announcing that it has
performed Zero Min and Max Scale Coefficients.

5. Send a message to the module instructing it to perform Min Scale
Calibration (1mA) on the channel(s).

6. Await an echo message from the module announcing that it has
performed Min Scale Calibration.

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Calibrating Your Module 5-9

7. Record the value indicated by the channel(s) precision current meter
into the appropriate channel’s(s’) data table location.

8. Send a message to the module instructing it to Accept Value in
Channel Data Word as Min Scale Calibration on the channel(s).

9. Await an echo message from the module announcing that it has
performed Accept Value in Channel(s) Data Word(s) as Min Scale
Calibration on the channel(s).

10. Send a message to the module instructing it to perform Max Scale
Calibration (21mA) on the channel(s).

11. Await an echo message from the module announcing that it has
performed Max Scale Calibration.

12. Record the value indicated by the channel(s) precision current meter

into the appropriate channel’s(s’) data table location.

13. Send a message to the module instructing it to Accept Value in
Channel(s) Data Word(s) as Max Scale Calibration on the

channel(s).

14. Await an echo message from the module announcing that it has
performed Accept Value in Channel(s) Data Word(s) as Max Scale

Calibration on the channel(s).

15. After all channels are calibrated, send a message to the module
instructing it to go to Commands Idle state.

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5-10 Calibrating Your Module

The following table shows the calibration MODULE command definitions.

Table 5.9 Calibration MODULE Command Definitions

MODULE Calibration Command MODULE Calibration Command Data

Command Meaning Data (up nibble) Data (low nibble) Meaning

channel command

0 Commands Idle x x command method is idle

1 No Operation x x no operation is required

4 General Calibration by Channel 0-7 0 zero min scale and max scale coefficients

0-7 1-15 not used

8-15 0-15 not used

5 Min Scale Calibration by

Channel

0-7 0 output = 1mA

0-7 1 accept value in channel data word as min

scale calibration

0-7 2-15 not used

8-15 0-15 not used

6 Max Scale Calibration by

Channel

36 Calibration all Channels

General Calibration all Channels 0 0 zero min scale and max scale coefficients

Min Scale Calibration all

Channels

Max Scale Calibration all

Channels

0-7 0 output = 21mA

0-7 1 accept value in channel data word as max

scale calibration

0-7 2-15 not used

8-15 0-15 not used

0 1-15 not used

1 0 output = 1mA

1 1 accept values in channel data words as min

scale calibration

1 2-15 not used

2 0 output = 21mA

2 1 accept values in channel data words as

max scale calibration

2 2-15 not used

3-15 0-15 not used

Chapter Summary

Publication 1797-6.5.1 - May 2005

In this chapter, you learned how to calibrate your FLEX Ex analog I/O
modules. Move to Chapter 6 to see how to apply FLEX Ex analog I/O
modules.

Chapter

Applying FLEX Ex Analog I/O Modules

6

What this Chapter Contains

Evaluate the Application

Read this chapter to learn how to use entity parameters when electrically
interconnecting your FLEX Ex analog I/O module in a hazardous area.

For information on: See page:

Evaluate the Application 6-1

Define the Area Classification 6-2

Select Protection Method(s) 6-3

Match Field Devices and I/O Modules 6-3

Optimize Power Distribution 6-7

Chapter Summary 6-9

The FLEX Ex system is different from traditional control systems used the
intrinsic safety in its ability to be located directly in hazardous areas and to
embrace high speed network-based control.

Follow these steps when designing a FLEX Ex system for your application:

1. Define the area classification.

2. Select protection method(s).

3. Match field devices and I/O modules.

4. Optimize power distribution.

5. Layout the ControlNet Ex network.

An explanation of each of these steps is provided in this chapter.

1 Publication 1797-6.5.1 - May 2005

6-2 Applying FLEX Ex Analog I/O Modules

Define the Area Classification

Before you can determine what components will make up your FLEX Ex
system, you must define the area in which that system will operate. You must
determine the following:

• classification method

• hazard

• temperature rating

Decide Classification Method

Your application location will usually decide whether the classification method
is Zone or Class/Division, but the system designer may make this
determination. FLEX Ex is certified for Zone method only. Certification is
pending for Division method.

Determine Hazard

Hazard–typically gas, dust, or fibers–is determined by the material being
processed. For example, a coal mine will generally be rated for dust and
methane gas hazards. FLEX Ex is certified for gas hazard only.
Certification is pending for attaching wiring to FLEX Ex I/O modules from a
dust and fiber hazardous area.

Determine Temperature Rating

The spontaneous ignition temperature of the hazard in your application
determines the temperature rating. For example, an application with a
hydrogen hazard may use equipment with a temperature rating of T1 because
hydrogen’s ignition temperature is 550°C. FLEX Ex is certified as a T4
system.

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Applying FLEX Ex Analog I/O Modules 6-3

Select Protection Method(s)

Although the FLEX Ex system primarily uses the Intrinsic Safety protection
method, the system uses all methods listed below.

Table 6.1 Protection Methods for Hazardous Applications

/EEx

1

ib

Protection Method

Intrinsic Safety EEx

Encapsulation EEx

Increased Safety EEx

Flameproof EEx

1 In the Non-Incendive protection method, n: used locally in the United States and United Kingdom.

In the Intrinsic Safety method, ia: Zone 0, 1, 2 & ib: Zone 1, 2

IMPORTANT

As not all protection methods are applicable for all

Designation

ia

m

e

d

Method of Achieving
Protection

Energy Limiting

Segregation

Refined Mechanical Design

Containment

locations, consult local certifying agencies to determine
acceptable protection methods for your application.

Match Field Devices and I/O Modules

External

Load

Resistance

You must match field devices and I/O modules for your application to
function properly. Consider the following:

• Verify field device and I/O module operational characteristics

• Match entity parameters of field devices and I/O modules

P/I Analog Transmitter Functional and IS Parameters

The figure below shows a typical pressure to current analog transmitter. Two
types of characteristics are shown, functional and IS.

600

250

4-20mA IS

P/I Transmitter

10.5-42V operate
EEx ia IIC T4

Ui=30V
Ii=165mA
Ci=22.5nF

Li=730uH

10.5 16.4 24.7 42

Power Supply Voltage

41662

Publication 1797-6.5.1 - May 2005

6-4 Applying FLEX Ex Analog I/O Modules

1797-IE8 and -IE8NF Functional and IS Parameters

The figure below provides data, on the Flex Ex analog input modules, which
can be matched to this transmitter.

Flexbus

Bus

uC

91Ω
17V

22Ω

+V

-V

+

sig

–

4-20mA

Xmit

I

P

Analog Input

V>17V at I=0mA
V>15.5 at I=20mA
V>15V at I=22mA

0-22mA Measurement Range

EEx ia/ib IIB/IIC T4

Uo<23.7V

Io<92.5mA

IIB
Ca=560nF
La=10mH

IIC

Ca=66nF

La=2.5mH

Loop Functionality Verification

The functional characteristics will be checked first. The figure below shows the
general situation which must be analyzed for proper loop function.

On the left are the module components of the voltage source to run the loop
and its internal source resistance. In the center is the cable. It represents a loss
with regard to its resistance. Cable resistance is a function of cable length. On
the right is the transmitter, which has a minimum voltage it must see to
function properly.

41662

module source voltage=17V

module source resistance=91Ω

91Ω
17V

Publication 1797-6.5.1 - May 2005

22Ω

module sense

resistance=22Ω

+

sig

cable resistance loss

+

Ci<10pF/m

Li<0.5uH/m

R<0.1Ω/m

–

IIB

Ca=560nF

La=10mH

+

transmitter

minimum

voltage=10.5V

–

41664

Applying FLEX Ex Analog I/O Modules 6-5

The loop must function properly under maximum signal current conditions, in
this case 22mA. As can be seen the key variable, which must be determined, is
the total loop resistance. This may be determined with the following equation:

Rtotal =

0.022

= 295Ω

Once Rtotal is known, you must determine the actual cable resistance that can
be accommodated. This is the difference between Rtotal and the module
internal source and sense resistances: Rcable=295-91-22=182Ω

Rcable is used to determine the wiring length allowed between the module and
the transmitter:

182

(17-10.5)

Cable_length =

2*0.1

= 910m

Note, the “2” in the denominator of the equation is necessary to account for
the resistance of both cable conductors (signal source “+” and signal and
return “sig”).

Publication 1797-6.5.1 - May 2005

6-6 Applying FLEX Ex Analog I/O Modules

91Ω
17V

1797-IE8 Analog Input

EEx ia/ib IIB/IIC T4

Uo<23.7V

lo<92.5mA

IIB

Ca=560nF

La=10mH

IIC

Ca=66nF

La=2.5mH

Intrinsic Safety Entity Verification

Next we must determine if the pressure to current analog transmitter and the
Flex Ex analog input module are compatible from an IS perspective. We will
make this determination for a IIC gas application.

The figure below shows an extraction of pertinent information from the
figures on pages 6-3.

cable length = 10m

+

Ci<10pF/m

Li<0.5uH/m

R<0.1Ω/m

sig

22Ω

Module

Uo

Io
Ca
La

Module

Uo<23.7V

Io<92.5mA

Ca=66nF

La=2.5mH

< or =
< or =
> or =
> or =

< or =
< or =
> or =
> or =

Total Loop

Ui

Ii
Ci
Li

Module

Ui=30V

Ii=165

Ci=22.6nF

Li=735uH

Total Loop

=
=
=
=

=
=
=

Ci=22.5nF

=

Li=735uH

Ui

Ii

Ci

Li

Module

Ui=30V

Ii=165

Distance

(length

+

(length

+

Distance

+
+

(10m
(10m

Ci per length)

*

La per length)

*

Ci=10pF/m)

*

La=0.5uH/m)

*

In the figure above, three key items are shown, the field device the
interconnecting cabling and the Flex Ex module (in this example, a 1797-IE8).
The entity verification is done for the gas group IIC. As the table shows, the
module’s entity parameters are compared to the combination of the transmitter
and the wiring entity parameters.

P/I transmitter

EEx ia IIC T4

Ui=30V
Ii=165mA
Ci=22.5nF
Li=730uH

Cable

Cable

41665

Publication 1797-6.5.1 - May 2005

The module’s entity parameters are shown in the Module column on the left.
They must be compared with the parameters shown in the Total Loop column,
in the manner shown. The values in the Total Loop column are determined in
the following manner:

• Total Loop U

• Total Loop Ii = Transmitter I

= Transmitter U

i

i

i

• Total Loop Ci = (Transmitter Ci + Cabling Ci per length) X (cable

length)

• Total Loop L

= (Transmitter Li + Cabling Li per length) X (cable

i

length)

As long as the Module and Total Loop entity parameters satisfy the inequalities
shown the loop is acceptable for use in the hazardous environment.

Applying FLEX Ex Analog I/O Modules 6-7

I/O

The input and output modules comply fully to and provide simple entity
parameters. These modules can directly interface with a wide variety of
intrinsically safe controls and instrumentation. Because all field device power is
supplied directly from the I/O module, no extra wiring or power sources are
needed in a hazardous area.

Finally, these modules maintain intrinsic safety in hazardous areas by providing
isolation from other modules in the system as well as intrinsic safety
segregation between channels on the same module.

Optimize Power Distribution

5

IRT8

4

3

1.6W

IRT8

1.6W

Your FLEX Ex system must use adequate power supplies to support the
physical locations determined earlier in this chapter. Each FLEX Ex I/O
module in the system is rated for input power, and the FLEX Ex power supply
is rated in the number of output channels and power available from each
channel.

Assigning Power Supplies

Note the amount of power each module requires and assign it to a power
supply output. Continue to assign modules to the power supply output until
the supply’s output power rating is consumed. The graphic below shows the
number of modules per power supply output.

IRT8

1.6W

Modules

IRT8

2

1

0

1.6W

IRT8

1.6W

IRT8

1.6W

IBN16

2.8W

IBN16

2.8W

IBN16

2.8W

IJ2

4.25W

IJ2

4.25W

IRT8

1.6W

IE8

7.5W

OE8

6.3W

Modules Per Power Supply Output

ACNR

8.5W

RPFM

(In

RPFM

(In

RPA

8.5W

IRT8

1.6W

IRT8

1.6W

IBN16

2.8W

IBN16

2.8W

IJ2

4.25W

IRT8

1.6W

IBN16

2.8W

IBN16

2.8W

IRT8

1.6W

IRT8

1.6W

IJ2

4.25W

41661

Each power supply output in the FLEX Ex system is rated for 8.5W.
Modules can be attached to the output until their combined power equals
that number. Do not exceed the power supply maximum of 8.5W.

Publication 1797-6.5.1 - May 2005

6-8 Applying FLEX Ex Analog I/O Modules

Assign the next module to another output as before. When all four power
supply outputs are utilized, add another power supply to the system, see the
figure below.

Safe Area

Unsafe
Power
Entrance

Spare

RPA RPFM RPFM

Hazardous Area

IS 1797 I/O

IS 1797 I/O

IS 1797 Fiber Hub

EEx ib

EEx ib

EEx ib

IS Pwr
IS Pwr
IS Pwr
IS Pwr

IS Pwr
IS Pwr
IS Pwr
IS Pwr

IS Pwr
IS Pwr
IS Pwr
IS Pwr

EEx d
/e

1797 power supply

ACNR Spare IE8 OE8 IRT8 Spare Spare IJ2 IJ2

EEx d
/e

1797 power supply

ACNR OB4D OB4D IBN16 IBN16 IBN16 IE8 IRT8 OE8

EEx d
/e

1797 power supply

41306

Publication 1797-6.5.1 - May 2005

ATTENTION

Power supply outputs can never be paralleled. Paralleling
outputs voids all intrinsic safety certifications.

Applying FLEX Ex Analog I/O Modules 6-9

Power Supply Considerations

When applying power, consider the certain characteristics of the wire
connecting the power supply output to a module’s power input. The wire
cannot exhibit more than:

• 0.1Ω of resistance (+V and -V combined)

• 800nF of capacitance

• 10µF of inductance

Typically, these restrictions will yield wiring lengths of not more than 3.5m or

2

5.8m (1.5mm
or wiring methods.

and 2.5mm2 wire respectively) without the use of special wiring

Chapter Summary

In this chapter you learned how to apply the FLEX Ex analog I/O modules.
Move to Chapter 7 to learn about troubleshooting your modules.

Publication 1797-6.5.1 - May 2005

6-10 Applying FLEX Ex Analog I/O Modules

Notes:

Publication 1797-6.5.1 - May 2005

Troubleshooting the FLEX Ex Analog I/O Modules

Chapter

7

What this Chapter Contains

Status Indicators

Read this chapter to troubleshoot your I/O module.

For information on: See page:

Status Indicators 7-1

Repair 7-2

Chapter Summary 7-2

1797-IE8 and -IE8NF Modules

The 1797-IE8 and -IE8NF modules have one power indicator that is on when
power is applied to the module and one status indicator for each input.

Ex

8 CHANNEL ANALOG INPUT

IN1IN0 IN2 IN3 IN4

A B C

A = Status indicators
B = Insertable labels for writing individual input designations
C = Power indicator

IN5

1797-IE8

IN6 IN7

3

PWR

40070

Indicator Color State Meaning

Status Red On At power up – Channel 0 indicator lights at powerup until

all internal diagnostics are checked. After successful
powerup, the indicator goes off if no fault is present.
After successful powerup – Indicates a critical fault
(diagnostic failure, etc.)

Blinking (when
faults are
enabled, and bit
set)

Power Off Module not powered

Green On Module receiving power

1 Publication 1797-6.5.1 - May 2005

Indicates a noncritical channel fault

7-2 Troubleshooting the FLEX Ex Analog I/O Modules

1797-OE8 Module

The 1797-OE8 module has one power that is on when power is applied to the
module and one status indicator for each input.

B-A

Allen-Bradley

8 CHANNEL ANALOG OUTPUT

1797- OE8

OUT 1OUT 0 OUT 2 PWROUT 7OUT 6OUT 5OUT 4OUT 3

4

41442

A B C

A = Status indicators
B = Insertable labels for writing individual input designations
C = Power indicator

Indicator Color State Meaning

Status Red On At power up – Channel 0 indicator lights at powerup until

all internal diagnostics are checked. After successful
powerup, the indicator goes off if no fault is present.
After successful powerup – Indicates a critical fault
(diagnostic failure, etc.)

Blinking (when

Indicates a noncritical channel fault
faults are
enabled, and bit
set)

Power Off Module not powered

Green On Module receiving power

Repair

Chapter Summary

Publication 1797-6.5.1 - May 2005

This module is not field repairable. Any attempt to open this module will void
the warranty and IS certification. If repair is necessary, return this module to
the factory.

In this chapter you learned how to troubleshoot the FLEX Ex analog I/O
modules. Move to Appendix A to see the specifications for your module.

Notes:

Troubleshooting the FLEX Ex Analog I/O Modules 7-3

Publication 1797-6.5.1 - May 2005

7-4 Troubleshooting the FLEX Ex Analog I/O Modules

Publication 1797-6.5.1 - May 2005

Specifications

Appendix

A

1797-IE8 and -IE8NF Input Modules

Specifications

Number of Inputs 8 single-ended, non-isolated

IS Input Type EEx ia IIB/IIC T4

AEx ia IIC T4
Class I, II, III Division 1 Groups A-G T4 (1797-IE8)
Class I, II, III Division 1 & 2 Groups A-G T4 (1797-IE8NF)

IS Module Type EEx ib IIB/IIC T4

AEx ib IIC T4
Class I Division 1 & 2 Groups A-D T4

Resolution 16 bits

Transfer Characteristics

Accuracy at 20°C (68°F)
Temperature Drift

Functional Data Range >15V @22mA

Data Format Configurable

Step Response to
99% of FS

Module from Adapter
Best/Worst Update Time

Indicators 8 red fault indicators

0.1% of output signal range

0.005%/C of output signal range

>21.5V @ 0mA

4ms

50/1450µs

1 green power

Output (Intrinsically Safe)

(16 pin male/female
flexbus connector)

Isolation Path

Input to Power Supply
Input to Flexbus
Input to Input
Power Supply to

Flexbus

Power Supply
(+V, -V intrinsically safe)

Module Field-side Power
Consumption

1 Publication 1797-6.5.1 - May 2005

U

< 5.8V dc

i

< 400mA

I

i

= Negligible

L

i

C

< 1.35µF

i

Isolation Type
Galvanic to DIN EN50020
Galvanic to DIN EN50020
None
Galvanic to DIN EN50020

U

< 9.5V dc

i

< 1A

I

i

= Negligible

L

i

= Negligible

C

i

7.5W

A-2 Specifications

Power Dissipation 5.2W

Thermal Dissipation 17.75 BTU/hr

Module Location Cat. No. 1797-TB3 or -TB3S

Conductor Wire Size

12 gauge (4mm

2

) stranded maximum

3/64in (1.2mm) insulation maximum

Dimensions 46mm x 94mm x 75mm

(1.8in x 3.7in x 2.95in)

Weight 200g (approximately)

Keyswitch Position 3

Environmental Conditions

Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating

Nonoperating
Vibration

-20 to +70

-40 to +85
5 to 95% noncondensing
Tested to 15g peak acceleration, 11(+1)ms pulse width
Tested to 15g peak acceleration, 11(+1)ms pulse width
Tested 2g @ 10-500Hz per IEC68-2-6

o

C (-4 to +158oF)

o

C (-40 to +185oF)

Agency Certification

CENELEC

II (1) 2G EEx ia/ib IIB/IIC T4
II (1D) (2D)

UL, C-UL

Class I Division 1 & 2 Groups A-D T4
Class I Zone 1 & 2 AEx ib/[ia] IIC T4

FM

Class I Division 1 Groups A-D T4
Class I Zone 1 AEx ib/[ia] IIC T4

Certificates

CENELEC DMT 98 ATEX E 020 X

UL, C-UL UL Certificate Number 99.19699

Class I Division 1 Hazardous

CUS

FM FM Certificate Number 3009806

FM

Publication 1797-6.5.1 - May 2005

Specifications A-3

1797-IE8 and -IE8NF CE, CENELEC I/O Entity Parameters

Measurement input (sig to -) for ch 0 to ch 7 (terminals: 1-2; 5-6; 9-10;
13-14; 18-19; 22-23; 26-27; 30-31)

U

= 5V

o

= 1mA

I

o

= 1.3mW

P

o

= 28V

U

i

= 93mA

I

i

and Li

C

i

Protection Group Allowed

Capacitance

EEx ia IIB 1000µF 1H

IIC 100µF 1H

Allowed
Inductance

negligible

Source output (+ to sig) for ch 0 to ch 7 (terminals: 0-1; 4-5; 8-9; 12-13; 17-18;
21-22; 25-26; 29-30)

= 23.7V

U

o

= 92.5mA

I

o

= 548mW

P

o

If concentrated
capacitance
and/or
inductance are
available, use the
following values.

Protection Group Allowed

Capacitance

EEx ia IIB 560nF 10mH

IIC 66nF 2.5mH

EEx ia IIB 320nF 10mH

IIC 60nF 2mH

Allowed
Inductance

Source output plus measurement input (+ to -) for ch 0 to ch 7 (terminals: 0-2;
4-6; 8-10; 12-14; 17-19; 21-23; 25-27; 29-31)

U

= 23.7V

o

I

= 93.5mA

o

= 555mW

P

o

If concentrated
capacitance
and/or
inductance are
available, use the
following values.

Protection Group Allowed

Capacitance

EEx ia IIB 560nF 10mH

IIC 66nF 2.5mH

EEx ia IIB 320nF 10mH

IIC 60nF 2mH

Allowed
Inductance

Publication 1797-6.5.1 - May 2005

A-4 Specifications

1797-IE8 and -IE8NF UL, C-UL I/O Entity Parameters

If this product has the UL/C-UL mark, it has been designed, evaluated, tested,
and certified to meet the following standards:

• UL 913, 1988, Intrinsically Safe Apparatus and Associated Apparatus

for Use in Class I, II, and III Division 1, Hazardous (Classified)
Locations

• UL 1203, Explosion-Proof and Dust-Ignition-Proof Electrical

Equipment for Use in Hazardous (Classified) Locations

• UL 2279, Electrical Equipment for Use in Class I, Zone 0, 1, and 2

Hazardous (Classified) Locations

• UL 508, Industrial Control Equipment

• CSA C22.2 No. 157-92, Intrinsically Safe and Non-Incendive

Equipment for Use in Hazardous Locations

• CSA C22.2 No. 30-M1986, Explosion-Proof Enclosures for Use in

Class I Hazardous Locations

• CSA-E79-0-95, Electrical Apparatus for Explosive Gas Atmospheres,

Part 0: General Requirements

• CSA-E79-11-95, Electrical Apparatus for Explosive Gas Atmospheres,

Part 11: Intrinsic Safety “i”

• CSA C22.2 No. 14-95, Industrial Control Equipment

Wiring

Method

1 and 2 Any one

Channel Terminals Voc (V) Isc (mA) Vt (V) It (mA) Groups Ca (µF) La (mH)

channel
e.g. ch0

Wiring Methods

• Wiring method 1 - Each channel is wired separately.

• Wiring method 2 - Multiple channels in one cable, providing each

channel is separated in accordance with the National Electric Code
(NEC) or Canadian Electric Code (CEC).

Table 1

0(+), 1(sig) 23.7 92.5 - - A, B, IIC 0.06 2.0

C, E, IIB 0.18 8.0

D, F, G, IIA 0.48 16.0

1(sig), 2(-) 5 1.0 - - A, B, IIC 100 1000

C, E, IIB 300 1000

D, F, G, IIA 800 1000

0(+), 1(sig), 2(-) - - 23.7 93.5 A, B, IIC 0.06 2.0

C, E, IIB 0.18 8.0

D, F, G, IIA 0.48 16.0

Publication 1797-6.5.1 - May 2005

FLEX Ex Analog Input
I/O Module

B-A

Allen-Bradley

8 CHANNEL ANALOG INPUT

1797- IE8

7PWR01234 56

Key Position for
Ter mina l Ba se

3

Insertion

Specifications A-5

LEDs

Female Bus
Connection

Field Wiring
Ter mi na ls

IMPORTANT

A terminal base may or may not have an I/O module installed.

Hazardous (Classified) Location
Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
Class II, Div. 1 & 2 Groups E, F, G
Class III, Div. 1 & 2

Any Simple Apparatus  or I.S.
device with Entity Concept
parameters  (V
appropriate for connection t o
associated apparatus with En tity
Concept parameters listed in Table

1.

, I

, Ci, Li)

max

max



Male Bus
Connection

Terminal Base
Key

Hazardous (Classified) Location
Class I, Zones 1 & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D

ch0

0 (+)
1 (sig)

Female Bus
Connector

2 (-)

4 (+)

ch1

ch2

ch3

ch4

ch5

ch6

ch7

5 (sig)
6 (-)

8 (+)
9 (sig)

10 (-)

12 (+)
13 (sig)
14 (-)

17 (+)
18 (sig)
19 (-)

21 (+)
22 (sig)
23 (-)

25 (+)
26 (sig)

27 (-)

29 (+)
30 (sig)
31 (-)

V

=5.8V

max

I

=400mA

max

=1350nF

C

i

=negligible

L

i

V

=9.5V

max

=1A

I

max

C

=negligible

i

=negligible

L

i

Male Bus
Connector



1797-IE8

or

1797-IE8NF



34



35

51

50



16
33



40
41
42
43
44
45

Terminal Base

42055

To any intrinsically safe
device or associated
apparatus with Entity
Concept  parameters of
V

< 5.8V; Isc < 400mA.

oc

To any intrinsically safe
device or associated
apparatus with Entity
Concept  parameters of
V

< 9.5V; Isc < 1A.

oc

To any IS device with Entity
Concept  parameters of

, I

(V
for connection to associated

apparatus with Entity Concept
parameters listed in Table 2.

, Ci, Li) appropriate

max

max

Shield Connection Only

42056

Publication 1797-6.5.1 - May 2005

A-6 Specifications

Table 2

Terminals Vt (V) It (mA) Groups Ca (µF) La (µH)

Male Bus
Connector

 The entity concept allows interconnection of intrinsically safe apparatus

with associated apparatus not specifically examined in combination as a system
when the approved values of V
are less than or equal to V
approved values of C
C

and Li + L

cable

 Simple apparatus is defined as a device which neither generates nor stores

more than 1.2V, 0.1A, 20µJ, or 25mW.

 Wiring methods must be in accordance with the National Electric Code,

ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA
C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA
RP12.6.

5.8 400 A-G 3.0 3.0

and I

oc

and I

max

and La of the associated apparatus are greater than Ci +

a

respectively for the intrinsically safe apparatus.

cable

or Vt and It of the associated apparatus

sc

of the intrinsically safe apparatus and the

max

 This module, 1797-IE8 or -IE8NF, must be used with terminal base

1797-TB3 or 1797-TB3S.

 Terminals 3, 7, 11, 15, 20, 24, 28, 32, 36-39, and 46-49 shall not be

connected.

 WARNING: Substitution of components may impair intrinsic safety.

AVERTISSEMENT: La substitution de composant peut compromettre la
securite intrinseque.

Publication 1797-6.5.1 - May 2005

Specifications A-7

1797-IE8 and -IE8NF FM I/O Entity Parameters

If this product has the FM mark, it has been designed, evaluated, tested, and
certified to meet the following standards:

• FM C1. No.3600:1998, Electrical Equipment for Use in Hazardous

(Classified) Locations General Requirements

• FM C1. No.3610:1999, Intrinsically Safe Apparatus and Associated

Apparatus for Use in Class I, II, III Division 1 Hazardous (Classified)
Locations

• FM C1. No.3615:1989, Explosionproof Electrical Equipment General

Requirements

• FM C1. No.3810:1989, 1995, Electrical and Electronic Test, Measuring

and Process Control Equipment

• ANSI/NEMA 250, 1991, Enclosures for Electrical Equipment

Wiring Methods

Wiring

Method

1 and 2 Any one

Channel Terminals Voc (V) Isc (mA) Vt (V) It (mA) Groups Ca (µF) La (mH)

channel
e.g. ch0

• Wiring method 1 - Each channel is wired separately.

• Wiring method 2 - Multiple channels in one cable, providing each

channel is separated in accordance with the National Electric Code
(NEC).

Table 1

0(+), 1(sig) 23.7 92.5 - - A, B 0.15 4.0

C, E 0.45 12.0

D, F, G 1.20 32.0

1(sig), 2(-) 5 1.0 - - A, B 100 1000

C, E 300 1000

D, F, G 800 1000

0(+), 1(sig), 2(-) - - 23.7 93.5 A, B 0.15 4.0

C, E 0.45 12.0

D, F, G 1.20 32.0

Publication 1797-6.5.1 - May 2005

A-8 Specifications

FLEX Ex Analog Input
I/O Module

B-A

Allen-Bradley

8 CHANNEL ANALOG INPUT

1797- IE8

7PWR01234 56

Key Position for
Ter mina l Ba se

3

Insertion

LEDs

Female Bus
Connection

Field Wiring
Ter mi na ls

IMPORTANT

Hazardous (Classified) Location
Class I, Zones 0 Groups IIC
Class I, Div. 1 Groups A, B, C, D
Class II, Div. 1 Groups E, F, G
Class III, Div. 1

Any Simple Apparatus  or FM
approved device with Entity
Concept parameters  (V
Ci, Li) appropriate for connection
to associated apparatus with
Entity Concept parameters listed
in Table 1.

Male Bus
Connection

Terminal Base
Key

Terminal Base

42055

A terminal base may or may not have an I/O module
installed.

Hazardous (Classified) Location
Class I, Zones 1 Groups IIC
Class I, Div. 1 Groups A, B, C, D

ch0



, I

,

max

max

0 (+)

Female Bus

1 (sig)

Connector

2 (-)

ch1

ch2

ch3

ch4

ch5

ch6

ch7

4 (+)
5 (sig)
6 (-)

8 (+)
9 (sig)
10 (-)

12 (+)
13 (sig)
14 (-)

17 (+)
18 (sig)
19 (-)

21 (+)
22 (sig)
23 (-)

25 (+)
26 (sig)
27 (-)

29 (+)
30 (sig)
31 (-)

V

=5.8V

max

I

=400mA

max

=1350nF

C

i

=negligible

L

i

V

max

I

=1A

max

=negligible

C

i

=negligible

L

i

Male Bus
Connector



1797-IE8 or
1797-IE8NF

=9.5V



For connection to other
modules, refer to the
General FM Certification
Information on page
29-1 in 1797-6.5.6.

34



From FM approved

35

devices, 1797-PS2N.

51
50



For connection to other
modules, refer to the
General FM Certification
Information on page 29-1 in
1797-6.5.6.

16
33



40
41
42
43
44
45

Shield Connection Only

42056

Publication 1797-6.5.1 - May 2005

Specifications A-9

Table 2

Terminals Vt (V) It (mA) Groups Ca (µF) La (µH)

Male Bus
Connector

 The entity concept allows interconnection of intrinsically safe apparatus

with associated apparatus not specifically examined in combination as a system
when the approved values of V
are less than or equal to V
approved values of C
C

and Li + L

cable

 Simple apparatus is defined as a device which neither generates nor stores

more than 1.2V, 0.1A, 20µJ, or 25mW.

 Wiring methods must be in accordance with the National Electric Code,

ANSI/NFPA 70, Article 504 and 505. For additional information refer to
ANSI/ISA RP12.6.

5.8 400 A-G 3.0 3.0

and I

oc

and I

max

and La of the associated apparatus are greater than Ci +

a

respectively for the intrinsically safe apparatus.

cable

or Vt and It of the associated apparatus

sc

of the intrinsically safe apparatus and the

max

 This module, 1797-IE8, must be used with terminal base 1797-TB3 or

1797-TB3S.

 Terminals 3, 7, 11, 15, 20, 24, 28, 32, 36-39, and 46-49 shall not be

connected.

 WARNING: Substitution of components may impair intrinsic safety.

Publication 1797-6.5.1 - May 2005

A-10 Specifications

1797-OE8 Output Module

Specifications

Number of Outputs 8 single-ended, non-isolated

IS Output Type EEx ia IIB/IIC T4,

AEx ia IIC T4
Class I, II, III Division 1 Groups A-G T4

IS Module Type EEx ib IIB/IIC T4,

AEx ib IIC T4,
Class I Division 1 Groups A-D T4

Resolution 13 bit

Transfer Characteristics

Accuracy at 20
Temperature Drift

Load Range

Current
Voltage Available at 22mA
Load

Data Format Configurable

Step Response to 99% of FS 4ms

Indicators 8 red fault indicators

Output (Intrinsically Safe)

(16 pin male and female
flexbus connector)

Isolation Path

Output to Power Supply
Output to Flexbus
Output to Output
Power Supply to Flexbus

o

C (68oF)

0.1% of output signal range

0.010%/C of output signal range

0-22mA
>11V
0-500Ω @ 22mA

1 green power

U

< 5.8V dc

i

< 400mA

I

i

= Negligible

L

i

= < 1.35µF

C

i

Isolation Type
Galvanic to DIN EN50020
Galvanic to DIN EN50020
None
Galvanic to DIN EN50020

Publication 1797-6.5.1 - May 2005

Power Supply

(+V, -V Intrinsically Safe)

Module Field-Side Power

U

< 9.5V dc

i

< 1A

I

i

= Negligible

L

i

C

= Negligible

i

6.3W

Consumption

Power Dissipation 5.4W

Thermal Dissipation 18.4 BTU/hr

Module Location Cat. No. 1797-TB3 or -TB3S Terminal Base Unit

Conductors Wire Size 12 gauge (4mm

2

) stranded maximum

1.2mm (3/64in) insulation maximum

Dimensions 46 x 94 x 75mm (1.8 x 3.7 x 2.95in)

Weight 200g (approximately)

Keyswitch Position 4

Specifications A-11

Environmental Conditions

Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating

Non-Operating
Vibration

-20 to +70

-40 to +85
5 to 95% noncondensing
Tested to 15g peak acceleration, 11(+1)ms pulse width
Tested to 15g peak acceleration, 11(+1)ms pulse width
Tested 2g @ 10-500Hz per IEC68-2-6

o

C (-4 to +158oF)

o

C (-40 to +185oF)

Agency Certification

CENELEC

II (1) 2G EEx ia/ib IIB/IIC T4
II (1D) (2D)

UL, C-UL

Class I Division 1 & 2 Groups A-D T4
Class I Zone 1 & 2 AEx ib/[ia] IIC T4

FM

Class I Division 1 Groups A-D T4
Class I Zone 1 AEx ib/[ia] IIC T4

Certificates

CENELEC DMT 00 ATEX E 042 X

UL, C-UL UL Certificate Number 99.19699

Class I Division 1 Hazardous

CUS

FM FM Certificate Number 3009806

FM

1797-OE8 CENELEC I/O Entity Parameters

Signal output (+ to -) for ch 0 to ch 7 (terminals: 0-1; 4-5; 8-9; 12-13; 17-18;
21-22; 25-26; 29-30)

U

= 21V

o

= 93mA

I

o

P

= 145mW

o

If concentrated
capacitance
and/or
inductance are
available, use the
following values.

Protection Group Allowed

Capacitance

EEx ia IIB 1.27µF 10mH

IIC 188nF 3mH

EEx ia IIB 400nF 10mH

IIC 80nF 2mH

Allowed
Inductance

Publication 1797-6.5.1 - May 2005

A-12 Specifications

1797-OE8 UL, C-UL I/O Entity Parameters

If this product has the UL/C-UL mark, it has been designed, evaluated, tested,
and certified to meet the following standards:

• UL 913, 1988, Intrinsically Safe Apparatus and Associated Apparatus

for Use in Class I, II, and III Division 1, Hazardous (Classified)
Locations

• UL 1203, Explosion-Proof and Dust-Ignition-Proof Electrical

Equipment for Use in Hazardous (Classified) Locations

• UL 2279, Electrical Equipment for Use in Class I, Zone 0, 1, and 2

Hazardous (Classified) Locations

• UL 508, Industrial Control Equipment

• CSA C22.2 No. 157-92, Intrinsically Safe and Non-Incendive

Equipment for Use in Hazardous Locations

• CSA C22.2 No. 30-M1986, Explosion-Proof Enclosures for Use in

Class I Hazardous Locations

• CSA-E79-0-95, Electrical Apparatus for Explosive Gas Atmospheres,

Part 0: General Requirements

• CSA-E79-11-95, Electrical Apparatus for Explosive Gas Atmospheres,

Part 11: Intrinsic Safety “i”

• CSA C22.2 No. 14-95, Industrial Control Equipment

Wiring

Method

1 and 2 Any one

Channel TerminalsVoc (V) Isc (mA) Vt (V) It (mA) Groups Ca (µF) La (mH)

channel
e.g. ch0

Wiring Methods

• Wiring method 1 - Each channel is wired separately.

• Wiring method 2 - Multiple channels in one cable, providing each

channel is separated in accordance with the National Electric Code
(NEC) or Canadian Electric Code (CEC).

Table 1

0(+), 1(-) 21.0 100.0 - - A, B, IIC 0.08 2.0

C, E, IIB 0.24 8.0

D, F, G, IIA 0.64 16.0

Publication 1797-6.5.1 - May 2005

FLEX Ex Analog
Output I/O Module

B-A

Allen-Bradley

OUT 1OUT 0 OUT 2 PWROUT 7OUT 6OUT 5OUT 4OUT 3

8 CHANNEL ANALOG OUTPUT

1797- OE8

4

Specifications A-13

Key Position for
Terminal Base
Insertion

LEDs

Female Bus
Connection

Field Wiring
Terminals

IMPORTANT

A terminal base may or may not have an I/O module
installed.

Hazardous (Classified) Location
Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D
Class II, Div. 1 & 2 Groups E, F, G
Class III, Div. 1 & 2

Any Simple Apparatus  or I.S.
device with Entity Concept
parameters  (V
appropriate for connection to
associated apparatus with
Entity Concept parameters
listed in Table 1.

, I

, Ci, Li)

max

max

Male Bus
Connection

Ter mi na l Ba se
Key

Ter mina l Ba se

42013

Hazardous (Classified) Location
Class I, Zones 1 & 2 Groups IIC, IIB, IIA
Class I, Div. 1 & 2 Groups A, B, C, D

ch0



0 (+)

Female Bus

1 (-)

Connector

V

=5.8V

max

=400mA

I

4 (+)

5 (-)

8 (+)

9 (-)

12 (+)

13 (-)

17 (+)

18 (-)

21 (+)

22 (-)

25 (+)

26 (-)

29 (+)

30 (-)

max

C

=1350nF

i

=negligible

L

i

V
I

max

C
L

i

Male Bus
Connector

1797-OE8

=9.5V

max

=1A

=negligible

i

=negligible





ch1

ch2

ch3

ch4

ch5

ch6

ch7



To any intrinsically safe
device or associated
apparatus with Entity
Concept  parameters of
V

34

35

51

50

16
33
40
41
42
43
44
45

oc



To any intrinsically safe

device or associated
apparatus with Entity
Concept  parameters of
V

oc



To any IS device with Entity
Concept  parameters of
(V

max

for connection to associated
apparatus with Entity Concept
parameters listed in Table 2.

< 5.8V; Isc < 400mA.

< 9.5V; Isc < 1A.

, I

, Ci, Li) appropriate

max

Shield Connection Only

42016

Publication 1797-6.5.1 - May 2005

A-14 Specifications

Table 2

Terminals Vt (V) It (mA) Groups Ca (µF) La (µH)

Male Bus
Connector

 The entity concept allows interconnection of intrinsically safe apparatus

with associated apparatus not specifically examined in combination as a system
when the approved values of V
are less than or equal to V
approved values of C
C

and Li + L

cable

 Simple apparatus is defined as a device which neither generates nor stores

more than 1.2V, 0.1A, 20µJ, or 25mW.

 Wiring methods must be in accordance with the National Electric Code,

ANSI/NFPA 70, Article 504 and 505 or the Canadian Electric Code CSA
C22.1, Part 1, Appendix F. For additional information refer to ANSI/ISA
RP12.6.

5.8 400 A-G 3.0 3.0

and Isc or Vt and It of the associated apparatus

oc

and I

max

and La of the associated apparatus are greater than Ci +

a

respectively for the intrinsically safe apparatus.

cable

of the intrinsically safe apparatus and the

max

 This module, 1797-OE8, must be used with terminal base 1797-TB3 or

1797-TB3S.

 Terminals 2, 3, 6, 7, 10, 11, 14, 15, 19, 20, 23, 24, 27, 28, 31, 32, 36-39, and

46-49 shall not be connected.

 WARNING: Substitution of components may impair intrinsic safety.

AVERTISSEMENT: La substitution de composant peut compromettre la
securite intrinseque.

Publication 1797-6.5.1 - May 2005

Specifications A-15

1797-OE8 FM I/O Entity Parameters

If this product has the FM mark, it has been designed, evaluated, tested, and
certified to meet the following standards:

• FM C1. No.3600:1998, Electrical Equipment for Use in Hazardous

(Classified) Locations General Requirements

• FM C1. No.3610:1999, Intrinsically Safe Apparatus and Associated

Apparatus for Use in Class I, II, III Division 1 Hazardous (Classified)
Locations

• FM C1. No.3615:1989, Explosionproof Electrical Equipment General

Requirements

• FM C1. No.3810:1989, 1995, Electrical and Electronic Test, Measuring

and Process Control Equipment

• ANSI/NEMA 250, 1991, Enclosures for Electrical Equipment

Wiring Methods

Wiring

Method

1 and 2 Any one

Channel Terminals Voc (V) Isc (mA) Vt (V) It (mA) Groups Ca (µF) La (mH)

channel
e.g. ch0

• Wiring method 1 - Each channel is wired separately.

• Wiring method 2 - Multiple channels in one cable, providing each

channel is separated in accordance with the National Electric Code
(NEC).

Table 1

0(+), 1(sig) 21.0 100.0 - - A, B 0.20 3.5

C, E 0.60 10.5

D, F, G 1.60 28.0

Publication 1797-6.5.1 - May 2005

A-16 Specifications

n

FLEX Ex Analog
Output I/O Module

B-A

Allen-Bradley

8 CHANNEL ANALOG INPUT

1797- IE8

7PWR01234 56

3

Key Position for
Terminal Base
Insertion

LEDs

Female Bus
Connection

Field Wiring
Terminals

IMPORTANT

Hazardous (Classified) Location
Class I, Zones 0 Groups IIC, IIB, IIA
Class I, Div. 1 Groups A, B, C, D
Class II, Div. 1 Groups E, F, G
Class III, Div. 1

Any Simple Apparatus  or FM
approved device with Entity
Concept parameters  (V
I

, Ci, Li) appropriate for

max

connection to associated
apparatus with Entity Concept
parameters listed in Table 1.

Male Bus
Connection

Ter mi na l Ba se
Key

Ter mina l Ba se

42055

A terminal base may or may not have an I/O module
installed.

Hazardous (Classified) Location
Class I, Zones 1 Groups IIC
Class I, Div. 1 Groups A, B, C, D

ch0



,

max

0 (+)
1 (sig)

Female Bus

2 (-)

Connector

V

4 (+)
5 (sig)
6 (-)

8 (+)
9 (sig)
10 (-)

12 (+)
13 (sig)
14 (-)

17 (+)
18 (sig)
19 (-)

21 (+)
22 (sig)
23 (-)

25 (+)
26 (sig)
27 (-)

29 (+)
30 (sig)
31 (-)

=5.8V

max

I

=400mA

max

=1350nF

C

i

=negligible

L

i

=9.5V

V

max

I

=1A

max

=negligible

C

i

=negligible

L

i

Male Bus
Connector



1797-OE8



ch1

ch2

ch3

ch4

ch5

ch6

ch7



For connection to other
modules, refer to the
General FM Certification
Information on page 29-1 of
publication 1797-6.5.6.

34



From FM approved devices,

35

51

50

16
33
40
41
42
43
44
45

1797-PS2N.



For connection to other
modules, refer to the General
FM Certification Information o
page 29-1 of publication
1797-6.5.6.

Shield Connection Only

42056

Publication 1797-6.5.1 - May 2005

Specifications A-17

Table 2

Terminals Vt (V) It (mA) Groups Ca (µF) La (µH)

Male Bus
Connector

 The entity concept allows interconnection of intrinsically safe apparatus

with associated apparatus not specifically examined in combination as a system
when the approved values of V
are less than or equal to V
approved values of C
C

and Li + L

cable

 Simple apparatus is defined as a device which neither generates nor stores

more than 1.2V, 0.1A, 20µJ, or 25mW.

 Wiring methods must be in accordance with the National Electric Code,

ANSI/NFPA 70, Article 504 and 505. For additional information refer to
ANSI/ISA RP12.6.

5.8 400 A-G 3.0 3.0

and Isc or Vt and It of the associated apparatus

oc

and I

max

and La of the associated apparatus are greater than Ci +

a

respectively for the intrinsically safe apparatus.

cable

of the intrinsically safe apparatus and the

max

 This module, 1797-OE8, must be used with terminal base 1797-TB3 or

1797-TB3S.

 Terminals 2, 3, 6, 7, 10, 11, 14, 15, 19, 20, 23, 24, 27, 28, 31, 32, 36-39, and

46-49 shall not be connected.

 WARNING: Substitution of components may impair intrinsic safety.

Publication 1797-6.5.1 - May 2005

A-18 Specifications

Notes:

Publication 1797-6.5.1 - May 2005

Index

A

Alarms

1797-IE8 module

local fault 1-3, 1-6
overrange 1-3, 1-4
programming remote fault 1-6
remote fault 1-3, 1-5
underrange 1-3, 1-4
using fault mode with local fault

using fault mode with remote fault

using remote fault alarm to deter-

Analog Digital State

1797-OE8 module

Analog Fault State

1797-OE8 module

Area Classification

defining
hazard 6-2
method 6-2
temperature rating 6-2

6-2

1-3

2-2

alarm

2-2

alarm

mine alarm levels

B

Bit Descriptions

image table mapping

Bit/Word Description

4 output/4 input module

2-8

2-9

2-13

2-17

1-5

D

Data Format

1797-IE8 module

Digital Fault State

1797-OE8 module

Drilling Dimensions

wall/panel mounting

2-4

2-9

3-8

E

Entity Parameters

1797-IE8 module
1797-OE8 module A-11

European Union Directives

compliance to
EMC directive 3-2
Ex directive 3-2

A-3

3-2

F

Fault Mode

1797-IE8 module

enabling/disabling local fault alarm

2-2

enabling/disabling remote fault

alarm

Functional and Intrinsic Safety

Parameters

1797-IE8 module

2-2

2-2

6-4

C

Calibration 5-1

1797-IE8 module 5-6
1797-OE8 module 5-8
module command words 5-2
periodic 5-1
tools 5-2
tools and equipment 5-2

Communication Fault Behavior 4-7
ControlNet Ex Adapter 2-7
ControlNet Network 1-2, 4-2, 4-4

H

High Low Error Level

1797-IE8 module

2-3

I

Idle State Behavior 4-7
Image Table Mapping 2-13

1797-IE8 bit/word descriptions 2-15
1797-IE8 module 2-14
1797-OE8 bit/word descriptions 2-17
1797-OE8 module 2-16

Input Data Behavior

upon module removal

Input Filter Cutoff

1797-IE8 module

Installation 3-4

module 3-9

Intrinsic Safety Entity Verification 6-6

4-8

2-3

Publication 1797-6.5.1 - May 2005

2

K

Keyswitch

using on the terminal base unit

3-9

L

Latch Retry Mode

1797-OE8 module

Local Fault Mode

1797-OE8 module

Loop Functionality Verification 6-4

2-8

2-7

M

Module

shipping state

calibration

Module I/O Mapping 4-4
Module Installation 3-9
Module Status

indicators

Mounting

on terminal base

Mounting Kit

cat. no. 1794-NM1

Mounting the Module

on 1797-TB3 or 1797-TB3S terminal base

1-3

unit

5-1

3-9

3-7

3-9

P

Panel/Wall Mounting 3-7

drilling dimensions 3-8

Power

assigning power supplies
power supply considerations 6-9

Programming Software 4-2
Protection Method

encapsulation
flameproof 6-3
increased safety 6-3
intrinsic safety 6-3
selecting 6-3

6-3

6-7

R

Remote Transmitter Error Up or Down

1797-IE8 module

Removal and Insertion Under Power

(RIUP)

2-3

3-4

S

Scheduled Data-Transfer

over the FLEX Ex backplane

Specifications

1797-IE8 module

A-1

4-3

O

Output Enable

1797-OE8 module

2-7

T

Tools

calibration

Troubleshooting

1797-IE8 module indicators
1797-OE8 module indicators 7-2
module indicators 1-3
module repair 7-2

Two-Wire Transmitter Devices

connecting to the 1797-IE8 module

5-2

7-1

U

Unscheduled Data-Transfer

over the FLEX Ex backplane

4-3

W

Wall/Panel Mounting 3-7
Wiring

1797-IE8 module
1797-OE8 module 3-13, 3-14
1797-TB3 and 1797-TB3S terminal base

units

3-11, 3-12

3-10

3-12

Publication 1797-6.5.1 - May 2005