Rockwell Automation 1797-IRT8 User Manual

FLEX Ex Thermocouple/ RTD/mV Input Module

Cat. No. 1797-IRT8

User Manual

Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the

Application, Installation and Maintenance of Solid-State Control

(available from your local Allen-Bradley office), describes some important differences between solid-state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication.

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

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

ATTENTION

Identifies information about practices or circumstances that can lead to personal injury or death, property damage or economic loss

Attention statements help you to:

• identify a hazard

• avoid a hazard

• recognize the consequences

IMPORTANT

Allen-Bradley, FLEX Ex, FLEX I/O, and ControlNet Ex are trademarks of Rockwell Automation

ControlNet is a trademark of ControlNet International

Identifies information that is critical for successful application and understanding of the product.

Using This Manual

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 thermocouple/ RTD/mV module with the ControlNet Ex network. The manual helps you 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-IRT8 as the “input module”. or “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

1 About the FLEX Ex Analog Modules Describes features, capabilities,

2 Understanding Configurable FLEX Ex

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

thermocouple/RTD/mV Input Module Features

 products and ControlNet

and hardware components Describes configurable features of

the input module

3 How to Install Your Thermocouple/

RTD/mV Module

4 Input, Output and Configuration Files

for the hermocouple/RTD/mV Module on the ControlNet network

5 Calibrating Your Module Lists the tools needed, and the

6 Applying FLEX Ex Analog Modules Learn how to evaluate, define,

7 Troubleshooting Your Module How to use the indicators to

Appendix Title Contents

A Specifications Outlines module specifications and

B Programming the FLEX Ex Analog

Module using RIO

3 Publication 1797-6.5.2 - February 2001

How to install and wire the module

Describes communication over the I/O backplane between the module and the adapter, and how data is mapped into the image table

methods used to calibrate the module

select, match and optimize your system.

troubleshoot your module

accuracy Shows ladder diagramming for

programming.

Using This Manual 4

For Additional Information

For additional information on FLEX Ex systems and modules, refer to the following docum en ts ,

Catalog

Number

1797 Series FLEX Ex Product Data 1797-2.1

1797 Series FLEX Ex System Overview 1797-2.2

1797 Series ControlNet Ex System Cable Guide 1797-6.2.1

1797 Series FLEX Ex System Certification

Reference Manual 1797-TB3 FLEX Ex Terminal Base 1797-5.1 1797-TB3S FLEX Ex Spring Clamp Terminal Base 1797-5.2 1797-OE8 FLEX Ex 8 Output Analog Module 1797-5.3 1797-6.5.1 1797-IRT8 FLEX Ex RTD/Thermocouple/mV

Module 1797-IE8 FLEX Ex 8 Input Analog Module 1797-5.5 1797-6.5.1

Description

Publications

Installation Instructions

(Product data)

(System overview)

(System guide) 1797-6.2.6

1797-5.4 1797-6.5.2

User Manual

1797-IE8NF FLEX Ex 8 Input Analog Module w/

Noise Filter 1797-OB4D 4 Output Module 1797-5.6 1797-IBN16 FLEX Ex NAMUR Digital Input Module 1797-5.7 1797-IJ2 2 Frequency Input Module 1797-5.9 1797-6.5.4 1797-PS2N

1797-PS2E 1797-ACNR15 ControlNetEx Adapter 1797-5.14 1797-6.2.1 1797-RPA, -RPFM Fiber Hub 1797-5.15 1797-6.2.1 1797-BIC Bus Isolator 1797-5.13 1797-TPR,

- TPRS, -TPYR,

-TPYS 1797-CE1S,

-CE3S, -CEFTN,

-CEFTE 1797-EXMK Marker Kit 1797-5.23 1797 FLEX Ex System Certification 1797-6.5.6

FLEX Ex Power Supplies 1797-5.12

FLEX Ex Taps 1797-5.18 1797-6.2.1

Interconnect Cables 1797-5.20

1797-5.31 1797-6.5.1

In Summary

Publication 1797-6.5.2 - Febr uary 2001

This preface gave you information on how to use this manual efficiently. The next chapter introduces you to the 1797-IRT8 Thermocouple/RTD / mV Inpu t module .

Preface Using This Manual

About the FLEX Ex Thermocouple/ RTD/mV Input Module

Table of Contents

Important User Information. . . . . . . . . . . . . . . . . . . . . . . . . . 2

Why Read this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Who Should Read this Manual. . . . . . . . . . . . . . . . . . . . . . . . 3

About the Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

What this Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . . . 3

For Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4

In Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chapter 1

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

What the FLEX Ex Thermocouple/RTD/mV Modules Do. . . 1-1 How FLEX Ex Thermocouple/RTD/mV Modules

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

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

Features of Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

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

Using Alarms on the 1797-IRT8 Module . . . . . . . . . . . . . . . 1-3

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

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

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

Open Wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Cold Junction Compensation Alarm . . . . . . . . . . . . . . . . . . . . 1-4

Data Formats and Fault Modes . . . . . . . . . . . . . . . . . . . 1-5

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Chapter 2 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features

i Publication 1797-6.5.2 - February 2001

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

Setting a FLEX Ex Thermocouple/RTD Module’s Operating

Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Input Type Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Sensor Type Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

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

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

Sensor Mode Select . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Preset Temperature Select . . . . . . . . . . . . . . . . . . . . . . 2-5

RTD Loop Resistance Offset Select . . . . . . . . . . . . . . . . 2-6

Fault Mode Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

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

Using Module Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Overrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Underrange Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Fault Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Table of Contents ii

How to Install Your FLEX Ex Thermocouple/RTD/mV Module

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

Ex Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Installation in Zone 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

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

Removal and Insertion

Under Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

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

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

Panel/Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Mounting the 1797-IRT8 Module on the Terminal

Base Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Wiring the Terminal Base Units . . . . . . . . . . . . . . . . . . . . . 3-9

Connecting Wiring to the

FLEX Ex Thermocouple/RTD/mV Module . . . . . . . . . . . . . 3-10

Inputs/Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Wiring connections for the 1797-IRT8 Module. . . . . . . . 3-11

Grounding the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Input, Status, Output and Configuration Files for the Thermocouple/RTD/mV Module on the ControlNet Network

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 . . . . . . . . . . 4-2

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

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

Module I/O Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

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

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

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

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

Communication Fault Behavior. . . . . . . . . . . . . . . . . . . 4-6

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

Input Data Behavior upon Module Removal . . . . . . . . . 4-7

Thermocouple/RTD/mV Input Module (1797-IRT8) Image

Table Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Bit/Word Description for the Thermocouple/RTD/mV Input

Module (1797-IRT8) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14

Publication 1797-6.5.2 - Febr uary 2001

Calibrating Your Module

Applying FLEX Ex Thermocouple/ RTD/mV Input Modules

Table of Contents iii

Chapter 5

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

When and How to Calibrate Your FLEX Ex

Thermocouple/RTD/mV Input Module. . . . . . . . . . . . . . . . 5-1

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

Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

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

1797-IRT8 and Thermocouple and RTD Functional and IS

Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Using the Entity Method. . . . . . . . . . . . . . . . . . . . . . . . 6-5

Entity Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

General Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Interconnect Wiring 6-7

I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Optimize Power Distribution . . . . . . . . . . . . . . . . . . . . . . . 6-8

Assigning Power Supplies . . . . . . . . . . . . . . . . . . . . . . 6-8

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

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Troubleshooting the FLEX Ex Thermocouple/RTD/mV Input Module

Specifications

Chapter 7

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

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

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

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

Appendix A

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

CE/CENELEC I/O Entity Parameters . . . . . . . . . . . . . . . . . . A-2

UL, C-UL I/O Entity Parameters . . . . . . . . . . . . . . . . . . . . . A-3

Table 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

FM I/O Entity Parameters . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Wiring Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Table 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Table 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Publication 1797-6.5.2 - February 2001

Table of Contents iv

Programming the FLEX Ex I/O Modules Using RIO

Index

Back Cover

Appendix B

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

Enter Block Transfer

Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Using the PLC-5C Processor. . . . . . . . . . . . . . . . . . . . . . . . B-2

Publication 1797-6.5.2 - Febr uary 2001

Chapter

About the FLEX Ex Thermocouple/RTD/mV Input Module

What this Chapter Contains

What the FLEX Ex Thermocouple/RTD/mV Modules Do

Read this chapter to familiarize yourself with the 1797-IRT8 input module.

For information on: See page:

What the FLEX Ex Thermocouple/ RTD/mV Modules Do

How FLEX Ex Thermocouple/RTD/mV Modules Communicate with Programmable Controllers

Features of Your Module 1-2 Chapter Summary 1-5

The 1797-IRT8 module accepts up to 8 thermocouple, RTD or mV inputs. The inputs are nonisolated and are selected with analog multiplexers which have a common-mode input range of -0.5 to +3.6 volts. The inputs will accept a millivolt or resistive input. Default input

spans are –40.00mV to +100.00mV or 0.00 to 500.00 ohms. Fault Indicators are located on the field side.

No switches or jumpers are us ed on t he th ermocouple/RTD/mV input module. The Inputs have both fixed hardware filters and selectable firmware digital filters.

1-1

1-2

This 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

as well as a host of other module features.

1 Publication 1797-6.5.2 - February 2001

1-2 About the FLEX Ex Thermocouple/RTD/mV Input Module

How FLEX Ex Thermocouple/RTD/mV Modules Communicate with Programmable Controllers

FLEX Ex thermocouple/RTD/mV modules provide best utility when used with ControlNet Ex products on the Co ntrolNet 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.

When the data connection is 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 I/O modules. The following sequence of events occurs after power has initially been applied to your module:

1. The module begins an interal diagnostic check. The channel 0 LED

indicator turns ON to indicate the check has begun. The indicator turns OFF when th e che ck is finish ed.

Features of Your Module

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-IRT8

module, the module begins producing runtime data for the PLC.

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

operation, the data is returned to the PLC.

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

Publication 1797-6.5.2 - Febr uary 2001

About the FLEX Ex Thermocouple/RTD/mV Input Module 1-3

Indicators

Indicators are provided to identify input or output fault conditions, and to show when power is applied to the module.

1797-IRT8

Module Type

Using Alarms on the 1797-IRT8 Module

Removable Label

Keyswitch Position Indicator (#2)

Power On Indicator

40070

Input Designato rs

1797-IRT8

PWR

The 1797-IRT8 FLEX Ex module is capable of generating four alarms:

Underrange

•

Overrange

•

Fault (open wire)

•

Cold junction compensation 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 graphic below shows at what values these alarms are generated for Data Format 4.

Publication 1797-6.5.2 - February 2001

1-4 About the FLEX Ex Thermocouple/RTD/mV Input Module

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

CJC fault

underrange

overrange

CJC fault

Maximum

Measureable

Value

open w i re fault

Channel Data

Forced to

Maximum for Type

Minumum

Value for

Sensor

Type

normal signal range

Maximum

Value for

Sensor

Type

Overrange

If the input is greater than the maximum temperature of the thermocouple or RTD range, millivolt (+100mV), or resistance (500W) the overrange bit for that channel will be set.

Underrange

If the input is less than the minimum temperature of the thermocouple or RTD range, millivolt (-40mV), or resistance (0W) the underrange bit for that channel will be set.

Publication 1797-6.5.2 - Febr uary 2001

Open Wire

Individual channel fault alarm for broken wire. If a broken wire/ detached lead is detected, the data value is forced to maximum. In RTD/W mode, input levels above 540W will set this bit; in thermocouple/mV mode, input levels above 210mV will set this bit.

Cold Junction Compensation Alarm

Broken or detached lead or shorted lead detection is included for CJCs. This detection is only available when the input type selected is thermocouple and sensor mode is set to CJC compensation.

When either CJC fails its fault is reported. Both CJCs ae normally used in compensation calculations. If one CJC fails, calculations use the remaining good device. If both fail, calculations use the last good value.

About the FLEX Ex Thermocouple/RTD/mV Input Module 1-5

Data Formats and Fault Modes

The tables below shows the bit settings for the data formats and fault modes for your FLEX Ex thermocouple/RTD/mV module.

Data Formats

Bit 11 10 09 08 Data type for channels 0 thru 7

0000 0001 0010 0 0 1 1 -32767 to +32767

0 1 0 0 0 to 65535 0101 thru 1111 not used

Note: Module defaults to -4000 to 10,000 in millivolt mode, and 0 to 5000 in ohms mode

C (see note)

F (see note)

K (see note)

Chapter Summary

Fault Mode

Bit 06 Fault enable for channels 0-3

07 Fault enable for channels 4-7

0 = disabled 1 = enable wire-off detection

In this chapter, we told you about the FLEX Ex system and the thermocouple/RTD/mV module, and how it communicates with programmable controllers.

Publication 1797-6.5.2 - February 2001

1-6 About the FLEX Ex Thermocouple/RTD/mV Input Module

Publication 1797-6.5.2 - Febr uary 2001

Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features

Chapter

What this Chapter Contains

Read this chapter to familiarize yourself with configurable features on the 1797-IRT8 module.

For information on: See page:

Setting a FLEX Ex Thermocouple/RTD

Module’s Operating Status

Input Type Select 2-2 Sensor Type Select 2-2 Data Format 2-4 Preset Temperature Select 2-5 RTD Loop Resistance Offset Select 2-6 Fault Mode Select 2-7

Using Module Alarms 2-7

Overrange Alarm 2-7 Underrange Alarm 2-8 Fault Alarm 2-9

Chapter Summary 2-9

This chapter describes the following features:

2-2

Input type

•

Sensor type

•

• Data formats

• Preset temperature selection

• RTD loop resistance offset selections

• F a ult mode

• Overrange Alarms

• Und errange alarms

• Fault alarms

Important:You must use your programming software to configure

these features. A brief description of each module feature is provided in this chapter, but you must use the online help included with your programming software to perform specific configuration.

1 Publication 1797-6.5.2 - February 2001

2-2 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features

Setting a FLEX Ex Thermocouple/RTD

Module’s Operating Status

Input Type Select

Select the thermocouple or RTD mode for input channel groups 0-3 and 4-7. If 2 is selected, the module defaults to thermocouple. If 3 is selected, the module defaults to RTD.

Range: 0 = thermocouple, 1 = RTD, 2 and 3 not used

Bits 06-07 Input Type Select

Bit 07 06 Input type sel ect ion for channels 0-3

0 0 Thermocouple 01RTD 10 11

Input type select for channels 4 through 7 use bits in word 1.

Not used

Sensor Type Select

Select the type of sensor for input channel groups 0-3 and 4-7. Thermocouple mode 0 = mV, 1 = B, 2 = E, 3 = J, 4 = K, 5 = TXK/

XK(L), 6 = N, 7 = R, 8 = S, 9 = T, 10-15 not used. RTD mode: 0 = W , 1 = Pt100 IEC 751 Amen dment 2, 2 = Pt200 IEC 751

Amendment 2, 3 = Pt1 00 JIS C1604-1989, 4 = Pt200 JIS C1604- 1989, 5 = Ni100 DIN 43760-1987, 6 = Ni200 DIN 4376 0-1987, 7 = Ni120 Min co, 8 = Cu10 Minco, 9-15 not used.

If unused settings are chosen, diagnostic status “2 = configuration failure” will be set, and the last valid configuration will be used. The default = 0.

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Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-3

Bits 00-03 Sensor Type (Thermocouple or RTD)

RTD Type

Bit03020100Sensor type for channels 0 through 3

0000Resistance (default) 0001100 ohm Pt α = 0.00385 Euro (–200 to +870°C)

0010200 ohm Pt α = 0.00385 Euro (–200 to +400°C) 0011100 ohm Pt α = 0.003916 U.S. (–200 to +630°C) 0100200 ohm Pt α = 0.003916 U.S. (–200 to +400°C) 0101100 ohm Nickel (–60 to +250°C) 0110200 ohm Nickel (–60 to +200°C) 0111120 ohm Nickel (–80 to +320°C) 100010 ohm Copper (–200 to +260°C)

1001 through 1111 not used

Bits 00-03 Thermocouple Type

Bit03020100Sensor type for channels 0 through 3

0000mV (default) 0001B 300 to 1800°C (572 to 3272°F) 0010E –250 to 1000°C (–418 to 1832°F) 0011J –210 to 1200°C (–346 to 2192°F) 0100K –250 to 1372°C (–418 to 2502°F) 0101L –200 to 800°C (–328 to 1472°F) 0110N –250 to 1300°C (–418 to 2372°F) 0111R –0 to 1768°C (32 to 3214°F) 1000S –0 to 1768°C (32 to 3214°F) 1001T –250 to 400°C (–418 to 752°F)

1010 through 1111 not used

Input Filter Cutoff

A series of eight available input filters – filters are hardware and software – allow you to choose the best rolloff frequency for input channels on your I/O module. When choosing a filter, remember that time frequency rolloff may affect your input signal’s accuracy.

For example, in configuration word 0, if you choose the fastest time frequency of 600Hz (hardware filter only), little noise is added, but the slowest frequency of 0.2Hz will provide the most accurate process noise filtering. See below to decide which input filter to use in your application:

Publication 1797-6.5.2 - February 2001

2-4 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features

Input Filter Cutoff bits

Bit020100Definition

0 0 0 Hardware filtering only (default filtering) 600Hz (1.7ms) 0 0 1 40Hz (25ms) 0 1 0 10Hz (100ms) 0 1 1 4Hz (250ms) 1 0 0 2Hz (500ms) 1011Hz(1s)

1100.5Hz(2s)

1110.2Hz(5s)

Choose the best input filter cutoff in your programming software.

Data Format

You must choose a module data format in your user program. Select the format by setting bits as shown below. Note that this parameter affects channel accuracy.

Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode

Bit 11 10 09 08 Data type for channels 0-7

0000°C 0001°F 0010×K 0 0 1 1 –32767 to +32767 0 1 0 0 0 to 65535

0101 through 1111 not used

C, oF and oK will have formats appropriate to the selected thermocouple or RTD range (e.g. -xxxx to +xxxx with 1 decimal place implied - 3500 = 350.0). For Cu10 RTD, 2 decimal points are implied.

If using mV, data format defaults to -4000 to +10000 (2 decimal points implied (e.g. -40 to 100.00). If using W mode selection, data format defaults to 0 to 5000 (1 decimal point implied, e.g. 0.- to 500.0).

In the thermocouple and RTD modes, if unused data formats are

chosen, the module will default to

Publication 1797-6.5.2 - Febr uary 2001

Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-5

Sensor Mode Select

Selects the sensor mode for input channels 0-3 and 4-7. If using cold junction compensation, both CJCs must be installed. The

difference between the CJCs will be linearly apportioned to each thermocouple channel based on its position across the base. If one CJC is broken or missing, the remaining CJC is used t o compensate all channels. The appropriate CJC alarm will be set in this case. If the second CJC fails, the last valid reading is frozen for compensation use. The second CJC alarm will also be set.

When using only channels 0-3 for thermocouples, connect the CJCs to terminals 5 and 12. If only using channels 4-7, connect the CJCs to terminals 22 and 29. If all channels are configured for thermocouples, connect the CJCs to terminals 5 and 29.

When CJC thermistor temperature compensation is sele cted for one channel group, all channels configured for thermocouple inputs will use the CJC compensation.

05 04 Sensor mode for channels 0 thru 3

Bit

13 12 Sensor mode for channels 4 thru 7

Thermocoupl e Mode

00 0 1 Internal compensation - Uses the value selected for reference junction

10 1 1 Differential measurement between 2 channels

0 0 2-wire RTD - no compensation 0 1 2-wire RTD with user compensation 1 0 3-wire RTD 1 1 4-wire RTD

External compensation - uses cold junction sensors

No compensation (Data is referenced to 0

RTD Mode

Preset Temperature Select

This parameter is used if Input Type Select is set to thermocouple and Sensor Mode Select is set to fixed compensation. This parameter then sets a fixed reference temperature used to compensate all thermocouple channels.

The default = 0.

Publication 1797-6.5.2 - February 2001

2-6 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features

Bits 03-05 Reference Junction – used when input type is set to thermocouple and sensor

mode is set to fixed compensation. Sets a fixed reference junction to compensate all thermocouple channels.

Bit050403Reference Junction

0000°C 00120°C 01025°C 01130°C 10040°C 10150°C 11060°C 11170°C

RTD Loop Resistance Offset Select

This parameter is used if Input Type Select is set to RTD and Sensor Mode Select is set to 2-wire with loop resistance compensation. This parameter then sets total RTD loop resistance compensation for each RTD channel. Either the value stored for each channel during calibration is used to compensate the module RTD channels, or one of 3 fixed values is used to compensate module RTD channels.

This parameter is disabled for Cu10 RTDs.

00-15 (00-17) RTD loop resistance offset select bits – used input type is set to RTD and sensor

mode select is set to 2-wire with loop resistance compensation. Allows you to set the type of RTD loop resistance compensation used for all RTDs or one of three fixed values for all channels. NOTE: Not applicable to 10W copper RTD, which defaults to 0W.

Bit 01 00 RTD channel 0 Bit 03 02 RTD channel 1 Bit 05 04 RTD channel 2 Bit 07 06 RTD channel 3 Bit 09 08 RTD channel 4 Bit 11 10 RTD channel 5 Bit 13 12 RTD channel 6 Bit 15 14 RTD channel 7

0 0 Use channel loop compensation value stored during

calibration procedure for 2-wire RTD (default = 0W) 015W 1 0 10W 1 1 15W

Range: 0 = use channel loop compensation value determined and stored during calibration procedure for 2-wire RTD, 1 = 5Ω, 2 = 10Ω, 3= 15Ω. Default = 0.

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Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-7

Fault Mode Select

Select whether the channel fault detection is enabled or disabled for channels 0-3 and 4-7.

Range: 0 = disable, 1 = fault detection enabled (wire off, mV overvoltage, RTD open). Default = 0.

Using Module Alarms

Bits 06-07 Fault Mode bits – when a bit is set (1), fault mode is enabled for that channel.

Bit 06 corresponds to channels 0-3; bi t 07 corresponds to channels 4-7. 0 = disabled 1 = enable wire-off detection

FLEX Ex I/O modules are capable of generating four alarms:

Overrange

•

Underrange

•

Fault

•

Cold Junction Compensation (CJC) Fault

•

These alarm conditions are described in general terms and as they relate to bits on the FL EX Ex I/O module on the following pages.

Overrange Alarm

The channel overrange alarm is set if the input is greater than the maximum temperature (thermocouple or RTD range dependent), millivolt (+100mV) or resistance (500Ω) range value.

Range: 0 = normal, 1 = input overrange. Default = 0. This alarm stays active at any value above 100% of range and is

always enabled by the module. Refer to the figure below for the sensor dependent signal which causes this alarm to be generated.

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2-8 Understanding Configurable FLEX Ex Thermocou ple/RTD/mV Input Module Features

IRT8 Specific alarming performance

PHYSICA L I NPUT SIGNAL RANGE

underran ge

CJC fault

Sensor Type

IEC PT100 IEC PT200

JIS PT100 JIS PT200

DIN Ni100 DIN Ni200

Minco Ni120

Minco Cu10

0-500 Resistance

millivolt ~ 210mV

B E

N R

S T

Cold Junction Compensation

normal signal range

-200C + 870C

-200C +400C

-200C +630C

-200C +400C

-60C +250C

-60C +200C

-80C +320C

-200C +260C 0ohm 500ohm

-40mV +100mV 300C +1800C

-250C +1000C

-210C +1200C

-250C

-200C + 800CTXK/XK(L)

-250C +1300C 0C

-250C + 400C

-20C 100C

+1372C

+1768C +1768C

overrange

CJC faul t

open w i re f ault

~ 520ohm equivalent ~ 520ohm equivalent

~ 520ohm equivalent ~ 520ohm equivalent ~ 520ohm equivalent ~ 520ohm equivalent

~ 520ohm equivalent ~ 520ohm equivalent

~ 520ohm

~ 210mV equivalent ~ 210mV equivalent ~ 210mV equivalent ~ 210mV equivalent ~ 210mV equivalent ~ 210mV equivalent ~ 210mV equivalent

~ 210mV equivalent ~ 210mV equivalent

Channel

Data

Forced

Maximum

for Type

Publication 1797-6.5.2 - Febr uary 2001

Underrange A l arm

The channel underrange alarm is set if the input is less than the minimum temperature (thermocouple or RTD range dependent), millivolt (-40mV) or resistance (0Ω) range value.

Range: 0 = normal, 1 = input overrange. Default = 0. This alarm stays active at any value below 0% of range and is always

enabled by the module. Range: 0 = normal, 1 = input overrange. Default = 0.

Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features 2-9

Fault Alarm

The module has individual channel fault alarms for a broken or detached wire. In any mode, if a broken/detached lead is detected, the data value is forced to maximum. Once the alarm is issued, it remains active as long as the input signal is faulted.

In mV mode, for input levels above 210mV, this bit is set. In RTD mode, an open input will set this bit. Range: 0 = normal,1 = wire off, excessive input fault detected. Default = 0.

Chapter Summary

In this chapter , we told you about the F LEX Ex sys tem and the analog I/O modules, and how they communicate with programmable controllers.

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2-10 Understanding Configurable FLEX Ex Thermocouple/RTD/mV Input Module Features

Publication 1797-6.5.2 - Febr uary 2001

Chapter

How to Install Your FLEX Ex Thermocouple/ RTD/mV Module

What this Chapter Contains

Before You Install Your Analog Module

Read this chapter to install the 1797-IRT8 thermocouple/RTD/mV module.

For information on: See page:

Before You Install Your Analog Module

Compliance to European Union Directives

Installation in Zone 1 3-2 Removal and Insertion Under Power 3-3 Installing the Module 3-3 Connecting Wiring to the FLEX Ex

Thermocouple/RTD/mV Module Grounding the Module 3-13 Chapter Summary 3-13

Before installing your FLEX Ex analog module:

You need to: As described under:

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

3-1

3-2

3-10

Installation in Zone 1, page 3-2

Position the keyswitch on the terminal base

ATTENTION

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.

Installing the Module, page 3-8

1 Publication 1797-6.5.2 - February 2001

3-2 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

Compliance to European Union Directives

If this product has the CE mark, it is approved for installation within the European and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet the Council Directive 89/336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:

EN 50081-2 EMC - Generic Emission Standard, Part 2 - Industrial

•

Environment EN 50082-2 EMC - Generic Immunity Standard, Part 2 - Industrial

•

Environment

This product is intended for use in an industrial environment.

Ex Directive

Installation in Zone 1

This product is tested to meet the Council Directive 94/9/EC (ATEX 100a) Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres by applying the following standards:

EN50014:1992, Electrical Apparatus for Potentially Explosive

•

Atmospheres EN50020:1994, Electrical Apparatus for Potentially Explosive

•

Atmospheres - Intrinsic Safety “i” prEN50284:1997, Special requirements for construction, test and

•

marking of electrical apparatus of equipment group II, category 1G

This module must not be exposed to the environment. Provide a suitable metal enclosure.

ATTENTION

This module cannot be used in an intrinsically safe environment after it has been exposed to non-intrinsically safe signals.

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How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-3

Electrostatic Charge

Removal and Insertion Under Power

Installing the Module

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.

ATTENTION

Installation of this module consists of:

mounting the terminal base unit

•

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

•

installing the connecting wiring to the terminal base unit

•

This module is designed so you can remove and insert it under power. However, take special care when removing or inserting this module 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 are installing your module into a terminal base unit that is

already installed, proceed to “Mounting the 1797-IRT8 Module on the Terminal Base” on page 8.

ATTENTION

Moun ting on a DIN Rail

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.

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.

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3-4 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

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).

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

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.

41106

41107

Publication 1797-6.5.2 - Febr uary 2001

How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-5

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 m a le 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 t o 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 i n pl ace.

Gently push the flexbus connector into the side of the adapte r (or pr oceeding terminal base) to complete the backplane connection.

41109

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 3-10.

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

8. Install the flexbus connector cover on the last terminal base is in

place.

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3-6 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

Panel/Wall Mounting

Installation on a wall or panel consists of:

laying out the drilling points on the wall or panel

•

drilling the pilot holes for the mounting screws

•

mounting the adapter mounting plate

•

installing the terminal base un its 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 1797-IRT8 Module on the Terminal Base Unit on page 3-8.

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

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)

1.4

(35.5)

41547

Terminal Base Unit (not included)

To install the mounting plate on a wall or panel:

Publication 1797-6.5.2 - Febr uary 2001

How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-7

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 hol es. Do not drill holes above a system that has any modules installed.

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

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)

(15.6)

.61

-V

(8)

-V

40871

3. Mount the mounting plate (1 ) fo r the ad apter modu le us ing two #6 self-tapping screws (18 included for mounting up to 8 modules and the adapter).

Make certain that the mounting plate is properly grounded to the

panel. Refer to “Industrial Automation Wiring and Grounding Guidelines,” publication 1770-4.1.

4. Hold the adapter (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 lockin g lever locks.

6. Position the terminal base unit up against the adapt er 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.

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3-8 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

Mounting the 1797-IRT8 Module on the Terminal Base Unit

The 1797-IRT8 module mounts on a 1797-TB3 or TB3S intrinsically safe terminal base unit.

1. Rotate keyswitch (1) on terminal base unit (2) clockwise to position 2 as required for this type of module. Do not change

the position of the keyswitch after wiring the terminal base unit.

Label under here or under here

1 8

40231

2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring ter minal ba se/ adapte r. You cannot install the module unless the connector is fully extended.

Publication 1797-6.5.2 - Febr uary 2001

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 termin a l base .

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

How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-9

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.

41307

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

Wiring the Terminal Base Units

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

ATTENTION

The FLEX Ex 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 w ith an intrinsically safe power supply. Do not exceed the values listed in the specifications for the modules.

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3-10 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

Connecting Wiring to the FLEX Ex Thermocouple/ RTD/mV Module

Inputs/Outputs

Each input can be operated from a thermocouple (TC), resistance temperature detector (RTD), or millivolt. Do not apply any

non-intrinsically safe signals to this module.

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

The channels in this module are electrically connected to each other and have a common plus-line.

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

Connections for the 1797-IRT8 Module

Power Supply

-V

FLEX Bus

Bus

+ H

Thermocouple

+ CJC

CJC

2W RTD

3W RTD

4W RTD

Row A

Row B

Row C

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

Ch 1

Ch 2

Ch 6

Ch 3

Ch 7

CJC

Chassis GND for shield

Ch 0

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

Ch 4 Ch 5

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

+V -V +V -V

CJC

Chassis GND for shield

No connection allowed to terminals 36 and 49

41505

Publication 1797-6.5.2 - Febr uary 2001

How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-11

Wiring connections for the 1797-IRT8 Module

1. For RTD inputs: a. connect the individual source current input wiring to (+)

terminals for each individual channel (0, 4, 8 and 12) on the 0-15 row (A) and terminals 17, 21, 25, and 29 on the 16-33 row (B) as indicated in the table below.

b. connect the associated signal return (-) to the corresponding (- ) terminals (3, 7, 11, and 15) on the 0-15 row (A), and terminals 20, 24, 28 and 32 on the 16-33 row (B).

2. For thermocouple inputs: a. connect the individual high signal input wiring to (L) terminals

for each individual channel (2, 6, 10, and 14) on the 0-15 row (A) and terminals 19, 23, 27 and 31 on the 16-33 row (B) as indicated in the table below.

b. connect the associated low signal (-) to the corresponding (-) terminals (3, 7, 11 and 15) on the 0-15 row (A), and terminals 20, 24, 28, and 32 on the 16-33 row (B).

c. connect cold junction compensation wiring to terminals 37, 38 and 39, and terminals 46, 47 and 48.

d. Connect the tail of the CJC as follows:

• when using inputs 0-3 (row A) only for thermocouple inputs:

connect the tail of CJC1 to terminal 5 and CJC2 to terminal 12 on row A.

• when using inputs 4-7 (row B) only for thermocouple inputs:

connect the tail of CJC1 to terminal 22 and CJC2 to term inal 29 on row B.

• when using thermocouple inputs 0-7: connect the tail of CJC1 to

terminal 5 on row A, and CJC2 to terminal 29 on row B.

Importan t : Whenever you use thermocouple inputs, you must use

both cold junction compensators.

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

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

ATTENTION

ATTENTION:Make certain that you power this module with an int rinsically safe power supply . Do not exceed the values listed in the specifications for this module.

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 termin al 35 on the next base unit.

Publication 1797-6.5.2 - February 2001

3-12 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

2-wire RTD

3-wire RTD

4-wire RTD

Thermocouple

Millivolt

Type of Input

Connect the following:

+HL-

RTD - 2-wire 1 2 RTD - 3-wire 1 3 2 RTD - 4-wire 1 1a 2a 2 Thermocouple 1 2 Millivolt 1 2

1Terminals 16, 33, 40 thru 45 are chassis ground.

RTD or

Thermocouple

Channel

00123

RTD Source

Current

(+)

High Signal

Terminal (H)

Low Signal

Terminal (L)

14567 2891011 312131415 417181920 521222324 625262728 729303132

+V Terminals 34 and 50

-V Terminals 35 and 51

1 Terminals 37, 38 and 39 and 46, 47 and 48 are for cold junction

compensation (with 38 and 47 chassis ground). Connect CJC1 to terminal 5 or 21, CJC2 to terminal 12 or 29

2 Terminals 16, 33, and 40 thru 45 are chassis ground.

Shield

Signal

Return

(-)

Publication 1797-6.5.2 - Febr uary 2001

How to Install Your FLEX Ex Thermocouple/RTD/mV Module 3-13

Grounding the Module

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.

30820-M

Chapter Summary

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

Move to chapter 3 to learn about input, output and configuration files for the thermocouple/RTD/mV module on ControlNet.

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3-14 How to Install Your FLEX Ex Thermocouple/RTD/mV Module

Publication 1797-6.5.2 - Febr uary 2001

Chapter

Input, Status, Output and Configuration Files for the Thermocouple/RTD/mV Module on the ControlNet Network

What this Chapter Contains

Read this chapter to familiarize yourself with input, output and configuration files for the thermocouple/RTD/mV module on ControlNet.

For information on: See p age:

Using Programming Software in Y ou r FLEX Ex Application

Communication Over the FLEX Ex Backplane

I/O Structure 4-4 Fault State Data 4-6 Device Actions 4-6 Chapter Summary 4-14

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 configur ation .

4-2

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

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4-2 Input, Status, Output and Configuration Files for the Thermocouple /R TD/mV Module on the ControlNet Net w or k

Using Programming Software in Your FLEX Ex Application

When using FLEX Ex thermocouple/RTD/mV 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 then transferred to the controller during the program download and subsequently transferred to the appropriate I/ O modules.

Follow these general guidelines when configuring I/O modules:

1. Perform I/O mapping.

2. Instruct the FLEX Ex I/O modules to use I/O mapping file from

step 1.

3. Configure all I/O modules.

About the ControlNet Ex Adapter

Communication Over the FLEX Ex Backplane

Networ

ControlNet Ex Adapter

Write

The FLEX Ex ControlNet Ex ada pter (cat. no. 1 797-ACNR15) i nterfaces up to 8 FLEX Ex modules to a ControlNet processor or scanner. The adapter can support ControlNet real-time data connec tion s to individual modules or module groups. Each connection is independent of the others and can be from different processors or scanners.

One 1797-ACNR15 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 controlle rs or scanners, and/or programming terminals) over the ControlNet network. The adapter communicates with its I/O modules over the FLEX Ex back plane.

Read

I/O Module I/O ModuleI/O Module

Inputs Inputs Inputs

Status

Outputs

Configuration Configuration Configuration

Slot 0 Slot 1 Slot 7

Read Words

Write Words

StatusStatus

OutputsOutputs

41626

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Input, Status, Output and Confi gur at ion Files for the Thermocouple/RTD / mV Module on the ControlNet Network 4-3

Scheduled Data-T ransfer

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–throu gh ControlNet

•

I/O Transfer (CIO) instructions peer-to-peer messaging–through message (MSG) instructions

•

messaging from programming devices

•

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.

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4-4 Input, Status, Output and Configuration Files for the Thermocouple /R TD/mV Module on the ControlNet Net w or k

For example, a 16 point discrete input module will have up to 2 read words and 1 write word.

ControlNet Image

Input Size

1 Word

Status Size

1 Word

Configuration

Module Image

Input Faults

I/O Structure

Network READ

1 Word

Check the I/O map for the module for the exact mapping.

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

Not used

Delay Time

41627

Network WRITE

Publication 1797-6.5.2 - Febr uary 2001

Slot 7 Input Data

Slot 0 Output Data Slot 1 Output Data

Slot 7 Input Data

Read

Write

I/O

Module

Slot 0

I/O

Module

Slot 1

I/O

Module

Slot 7

41628

Input, Status, Output and Confi gur at ion Files for the Thermocouple/RTD / mV Module 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)

•

Resulting in the following FLEX Ex adapter status word for a PLC-5 controller.

I/O Module Fault Bits

Bit: 15 910 through 15 8 7 6 5 4 3 2 1 0

Table 4.A

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.

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.)

9 Bit = 0 -idle

bit = 1 - run

10 though 15 Not used – set to 0

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4-6 Input, Status, Output and Configuration Files for the Thermocouple /R TD/mV Module on the ControlNet Net w or k

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 pages 4-8.

Device actions include:

communication fault behavior

•

idle state behavior

•

input data behavior upon module removal

•

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 ca n:

Publication 1797-6.5.2 - Febr uary 2001

• 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 modu le output

Input, Status, Output and Confi gur at ion Files for the Thermocouple/RTD / mV Module on the ControlNet Network 4-7

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

•

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)

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4-8 Input, Status, Output and Configuration Files for the Thermocouple /R TD/mV Module on the ControlNet Net w or k

Thermocouple/RTD/mV Input Module (1797-IRT8) Image Table Mapping

Module Image

Input Data Channel 0

I/O Image

Input Size

1 to 11 Words

Overrange

Output Size

Input Data Channel 1 Input Data Channel 2

Input Data Channel 3 Input Data Channel 4

Input Data Channel 5 Input Data Channel 6 Input Data Channel 7

Underrange

Module command and responseRFlg

DiagnosticsCJCAlarms

0 to 4 Words

Bit/Word Description for the Thermocouple/RTD/mV Input Module (1797-IRT8)

Input Word

Input Word 0 00-15 (00-17) Channel 0 Input data Input Word 1 00-15 (00-17) Channel 1 Input data Input Word 2 00-15 (00-17) Channel 2 Input data Input Word 3 00-15 (00-17) Channel 3 Input data Input Word 4 00-15 (00-17) Channel 4 Input data Input Word 5 00-15 (00-17) Channel 5 Input data Input Word 6 00-15 (00-17) Channel 6 Input data Input Word 7 00-15 (00-17) Channel 7 Input data

Dec. Bits

(Octal Bits)

Data Format

RTD Offsets for each channel

Module command and dataCFlg

TC/RTDTC/RTD

Description

Filter CutReference Jct

Sensor TypeSensor TypeMode Mode

5-04

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Input, Status, Output and Confi gur at ion Files for the Thermocouple/RTD / mV Module on the ControlNet Network 4-9

Input Word

Input Word 8 00-07 Underr ange bits – these bits are set if the input signal is below the input channel’s minimum range.

Input Word 9 00-03 Diagnostic bits – represent module configuration and/or hardware errors.

Input Word 10 00-07 Module command response data bits – These bits echo th e m o du le co mm an d dat a writ t en to th e

Dec. Bits

(Octal Bits)

Bit 00 corresponds to channel 0, bit 01 corresponds to channel 1, etc.

08-15 (10-17) Overrange bits – these bits are set if 1), the input signal is above the input channel’s maximum

range, or 2), an open detector is detected. Bit 08 (10) corresponds to channel 0, bit 09 (11) corresponds to channel 1, etc.

Bit03020100

0000Reserved for factory use 0010Improper module configuration 0001 and 0011 thru 1111 Reserved for factory use

04 Not used.

05-06 Cold junction compensation alarm bits – These bits are set (1) when the corresponding cold

junction compensator lead is broken, unattached or shorted. Bit 05 corresponds to CJC1, and bit 06 to CJC2.

07 Not used

08-15 (10-17) Fault alarm bits – An alarm bit is set (1) when an individual input lead opens (broken,

disconnected). If the alarm is enabled, the channel reads maximum value. Bit 08 (10) corresponds to input channel 0, bit 09 (11) to channel 1, etc.

module during calibration.

08-14 (10-16) Module command response bits – These bits echo the module command written to the module

during calibration.

15 (17) Reserved for factory use

Description

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4-10 Input, Status, Output and Configu ra tion Files for the Thermocouple /RTD /mV Module on the ControlNet Ne t wo r k

Configuration

Word

Configuration

Word 0

Dec. Bits

(Octal Bits)

Bits 00-02 Input Filter Cutoff bits

Bit 02 01 00 Definition

0 0 0 Hardware filtering only (default filtering) 0 0 1 40Hz (25ms) 0 1 0 10Hz (100ms) 0 1 1 4Hz (250ms) 1 0 0 2Hz (500ms) 1011Hz(1s) 1 1 0 0.5Hz (2s) 1 1 1 0.2Hz (5s)

Bits 03-05 Reference Junction – used when input type is set to thermocouple and sensor mode is set to Fixed

Temperature Compensation. Sets a fixed reference junction to compensate all thermocouple channels.

Bit 05 04 03 Reference Junction

0 0 0 0°C 0 0 1 20°C 0 1 0 25°C 0 1 1 30°C 1 0 0 40°C 1 0 1 50°C 1 1 0 60°C 1 1 1 70°C

Bits 06-07 Fault Mode bits – when a bit is set (1), fault mode is enabled for that channel. Bit 06 corresponds to

Bits 08-11

(10-13)

Bits 12-15

(14-17)

channels 0-3; bit 07 corresponds to channels 4-7. 0 = disabled 1 = enable wire-off detection

Data format – module defaults to –4000 to 10000 in millivolt mode, and 0 to 5000 in ohms mode

Bit 11 10 09 08 Data type for channels 0-7

0000°C 0001°F 0010°K 0 0 1 1 –32767 to +32767 0 1 0 0 0 to 65535

0101 through 1111 not used

Not used

Description

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Input, Status, Out put and Configuration Files fo r th e Thermocouple/RTD/mV Module on the ControlNet Network 4-11

Configuration

Word

Configuration

Word 1

Dec. Bits

(Octal Bits)

Bits 00-03 Sensor Type (Thermocouple or RTD)

RTD Type

Bit 03 02 01 00 Sensor type for channels 0 through 3

0 0 0 0 Resistance (default) 0 0 0 1 100 ohm Pt α = 0.00385 Euro (–200 to +870°C)

0 0 1 0 200 ohm Pt α = 0.00385 Euro (–200 to +400°C) 0 0 1 1 100 ohm Pt α = 0.003916 U.S. (–200 to +630°C) 0 1 0 0 200 ohm Pt α = 0.003916 U.S. (–200 to +400°C) 0 1 0 1 100 ohm Nickel (–60 to +250°C) 0 1 1 0 200 ohm Nickel (–60 to +200°C) 0 1 1 1 120 ohm Nickel (–80 to +320°C) 1 0 0 0 10 ohm Copper (–200 to +260°C)

1001 through 1111 not used

Bits 00-03 Thermocouple Type

Bit 03 02 01 00 Sensor type for channels 0 through 3

0 0 0 0 mV (default) 0 0 0 1 B 300 to 1800°C (572 to 3272°F) 0 0 1 0 E –270 to 1000°C (–454 to 1832°F) 0 0 1 1 J –210 to 1200°C (–346 to 2192°F) 0 1 0 0 K –270 to 1372°C (–454 to 2502°F) 0 1 0 1 L –200 to 800°C (–328 to 1472°F) 0 1 1 0 N –270 to 1300°C (–450 to 2372°F) 0 1 1 1 R –50 to 1768°C (–58 to 3214°F) 1 0 0 0 S –50 to 1768°C (–58 to 3214°F) 1 0 0 1 T –270 to 400°C (–454 to 752°F)

1010 through 1111 not used

Description

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4-12 Input, Status, Output and Configu ra tion Files for the Thermocouple /RTD /mV Module on the ControlNet Ne t wo r k

Configuration

Word

Configuration

word 1 cont.

Dec. Bits

(Octal Bits)

Bits 04-05 Sensor Mode Select bits

Bit 05 04 Sensor mode select for channels 0-3

Thermocouple

00CJC compensation – uses cold junction sensor 0 1 Fixed Temperature compensation – uses the value selected for reference junction 1 0 No compensation (Data is referenced to 0°C.) 1 1 Differential measurement between 2 channels

RTD

0 0 2-wire RTD no compensation 0 1 2-wire RTD with loop resistance compensation 1 0 3-wire RTD 1 1 4-wire RTD

Bits 06-07 Input Type Select

Bit 07 06 Input type selection for channels 0-3

0 0 Thermocouple 01RTD 10 11

Description

Not used

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Input, Status, Out put and Configuration Files fo r th e Thermocouple/RTD/mV Module on the ControlNet Network 4-13

Configuration

Word

Configuration

Word 1 cont.

Dec. Bits

(Octal Bits)

Bits 08-11

(10-13)

Bits 12-13

(14-16)

Description

Sensor Type (Thermocouple or RTD) RTD Type

Bit 11 10 09 08 Sensor type for channels 4 through 7

0 0 0 0 Resistance (default) 0 0 0 1 100 ohm Pt α = 0.00385 Euro (–200 to +870°C)

0 0 1 0 200 ohm Pt α = 0.00385 Euro (–200 to +400°C) 0 0 1 1 100 ohm Pt α = 0.003916 U.S. (–200 to +630°C) 0 1 0 0 200 ohm Pt α = 0.003916 U.S. (–200 to +400°C) 0 1 0 1 100 ohm Nickel (–60 to +250°C) 0 1 1 0 200 ohm Nickel (–60 to +200°C) 0 1 1 1 120 ohm Nickel (–80 to +320°C) 1 0 0 0 10 ohm Copper (–200 to +260°C)

1001 through 1111 not used

Thermocouple Type

Bit 11 10 09 08 Sensor type for channels 4 through 7

0 0 0 0 mV (default) 0 0 0 1 B 300 to 1800°C (572 to 3272°F) 0 0 1 0 E –250 to 1000°C (–418 to 1832°F) 0 0 1 1 J –210 to 1200°C (–346 to 2192°F) 0 1 0 0 K –250 to 1372°C (–418 to 2502°F) 0 1 0 1 L –200 to 800°C (–328 to 1472°F) 0 1 1 0 N –250 to 1300°C (–418 to 2372°F) 0 1 1 1 R 0 to 1768°C (32 to 3214°F) 1 0 0 0 S 0 to 1768°C (32 to 3214°F) 1 0 0 1 T –250 to 400°C (–418 to 752°F)

1010 through 1111 not used

Sensor Mode Select bits

Bit 13 12 Sensor mode select for channels 4-7

Thermocouple

0 0 CJC compensation – uses cold junction sensor 0 1 Fixed temperature compensation – uses the value selected for reference junction 1 0 No compensation (Data is referenced to 0°C.) 1 1 Differential measurement between 2 channels

RTD

0 0 2-wire RTD no compensation 0 1 2-wire RTD with loop resistance compensation 1 0 3-wire RTD 1 1 4-wire RTD

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4-14 Input, Status, Output and Configu ra tion Files for the Thermocouple /RTD /mV Module on the ControlNet Ne t wo r k

Configuration

Word

Configuration

Word 1 cont.

Configuration

Word 2

Configuration

Word 3

Dec. Bits

(Octal Bits)

Bits 14-15

(16-17)

00-15 (00-17) RTD loop resistance offset select bits – used input type is set to RTD and sensor mode select is set to

00-07 Module command data bits – These bits are written to the module during calibration. They are used to

08-14 (10-16) Module command bits – These bits are written to the module during calibration. They are used to select

15 (17) Reserved for factory use only.

Input Type Select

Bit 15 14 Input type selection for channels 4-7

0 0 Thermocouple 01RTD 10Not used 11

2-wire with loop resistance compensation. Allows you to set the type of RTD loop resistance compensation used for all RTDs or one of three fixed values for all channels. NOTE: Not applicable to 10Ω copper RTD, which defaults to 0Ω.

Bit 01 00 RTD channel 0 Bit 03 02 RTD channel 1 Bit 05 04 RTD channel 2 Bit 07 06 RTD channel 3 Bit 09 08 RTD channel 4 Bit 11 10 RTD channel 5 Bit 13 12 RTD channel 6 Bit 15 14 RTD channel 7

0 0 Use channel loop compensation value stored during calibration procedure for

2-wire RTD (default = 0Ω) 015Ω 1010Ω 1115Ω

define offset, gain and general channel calibration.

channel calibration action.

Description

Chapter Summary

Publication 1797-6.5.2 - Febr uary 2001

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

Calibrating Your Module

Chapter

What This Chapter Contains

When and How to Calibrate Your FLEX Ex Thermocouple/RTD/mV Input Module

Use this chapter to calibrate the thermocouple/RTD/mV input module. We tell you about:

For information on See page

When and How to Calibrate Your TC/RTD Module. . . . . . . . . . . . . . . . 5-1

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

Calibration Method 5-2

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

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 thermocouple/RTD/mV modules are intrinsically safe equipment. This module cannot be used in instrinsically safe environmen t after having been exposed to non-intrinsicall y safe signals.

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.

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.

1 Publication 1797-6.5.2 - February 2001

5-2 Calibrating Your Module

Tools and Equipment

Calibration Method

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

Tool or Equipment: Description:

Precision Resistors High precision resistors:

383W, 0.01%, 5ppm/ 100W, 0.01%, 5ppm/

10kW, 0.5%, 5ppm/ Precision Voltage Source +320mV, 1mV resolution PC and Interconnect Cable Programming terminal for A-B family processors

Calibration is done through the I/O Configuration Software which is part of your programming software package, such as RSLogix 5.

Select the Calibration tab in the software and follow the instructions for complete module calibration..

Publication 1797-6.5.2 - Febr uary 2001

Chapter

Applying FLEX Ex Thermocouple/RTD/mV Input Modules

What this Chapter Contains

Evaluate the Application

Read this chapter to learn how to use entity parameters when electrically interconnecting your FLEX Ex thermocouple/RTD/mV input 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 Chapter Summary 6-10

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 1797-6.5.2 - February 2001

6-2 Applying FLEX Ex Thermocouple/RTD/mV Input 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 Cl assification Method

Y our application locatio n will usually de cide whether the classificatio n method is Zone or Class/Division, but the system designer may make this determination. FLEX Ex is presently certified for Zone method only.

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 presently certified for gas hazard method only.

Determine Temperature Rating

The spontaneous ignition temperature of the hazardous in your application determines the temperature rating. For example, an application with a hydrogen hazard uses a temperature rating of T1 because hydrogen’s ignition temperature is 450°C. FLEX Ex is presently certified as a T4 system.

Publication 1797-6.5.2 - Febr uary 2001

Applying FLEX Ex Thermocouple/RT D/mV Input Modules 6-3

Select Protection Method(s)

The following table shows protection methods, method designation, and how each provides protection. Although the FLEX Ex system primarily uses the Intrinsic Safety protection method, the system uses all methods listed below.

Table 6.A Protection Methods for Hazardous Applications

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

Designation

/EEx

ia m e d

Method of Achieving Protection

Energy Limiting Segregation Refined Mechanical Design Containment

As not all protection methods are applicable for all locations, consult local certifying agencies to determine acceptable protection methods for your application.

Match Field Devices and I/O Modules

Y ou must match fi eld devices and I/O modules for your application to function properly. Consider the following:

Verify field device and I/O module operational characteristics -

•

These characteristics will vary with sensor and application. For

example, RTD’s convert temperature to resistance change and are generally slow responding devices. Is its resistance range and speed appropriate for the module.

Match entity parameters of field devices and I/O modules - for

•

more specific information on matching entity parameters of field devices and the 1797-IRT8 module are shown later in this chapter.

1797-IRT8 and Thermocouple and RTD Functional and IS Verification

Thermocouples and RTDs are available in a number of industry standard types. These are generally designated by letter codes, such as N, K, T, etc for thermocouples. The IRT8 is designed to work with a variety of these types. Functional compatibility is simply a matter of selecting the correct sensor type when configur ing the IRT8 module with the system I/O configuration software.

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6-4 Applying FLEX Ex Thermocouple/RTD/mV Input Modules

Similarly for RTDs an number of industry standard types are available, such as PT100, Ni100, etc. Again, the IRT8 is designed to work wi th a variety of these types. Functional compatibility is simply a matter of selecting the correct sensor type when configuring the IRT8 module with the system I/O configuration software.

Thermocouples and RTDs are known as “simple devices” from an IS standpoint. Basically this means they either have no mechanism by which to produce or store energy or they are so simple and produce such low energy, that they are intrinsically safe.

Below is the IRT8 with its IS enti ty parameters for the main meas uring input used for thermocouples and RTDs. The example shown is for an RTD, IRT8 and the loop’s associated wiring.

FLEX

Bus

Thermocouple, RTD, mV Input

EEx ia/ib IIB/IIC T4

Uo=9V, Io=37mA, Po =8 3m W

IIB IIC Ca=40uF Ca=4.9uF La=80mH La=20mH

Lo/Ro=1.7mH/ohm Lo/Ro=0.4mH/ohm

-V + H L

Power Supply

cable length = 10m

Ci<10pF/m

Li<0.5uH/m

R<0.1ohm/m

Li/R<5uH/ohm

+ CJC

Module

Lo/Ro

Module

Uo<9V

Io<37A Ca=4.9uF La=20mH

Lo/Ro=0.4mH/ohm

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

Total Loop

Ii Ci Li

Li/R

Total Loop

Ui=10V Ii=100mA Ci=100pF

Li=5uH

Li/R=5uH/ohm

Transmitter

= = = = =

Transmitter

Ii=100mA

= = = =

Ii Ci Li

Ui=10V

Ci=0

Li=0

Distance Cable

(length * Ci per lengh)

(length * La per length)

Distance Cable

(10m * Ci=10pF/m)

(10m * La=0.5uH/m)

In the figure above, three items are sho wn :

• the field device

• the interconnecting cable

• and the Flex Ex module.

Li/R

Li/R=5uH/ohm

2W RTD

2 wire RTD

EEx ia IIC T6

Ui=10V

Ii=100mA

Ci=0 Li=0

Publication 1797-6.5.2 - Febr uary 2001

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 RTD and the wiring entity parameters.

The module’s entity parameters are shown in the Module column on the left. They must be compared with the parameters shown in the

Applying FLEX Ex Thermocouple/RT D/mV Input Modules 6-5

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 I

•

Total Loop C

•

per length multiplied by the cable length.

Total Loop L

•

per length multiplied by the cable length.

is equal to the transmitter Ui.

is equal to the transmitter Ii.

is the addition of the transmitter Ci and the cabling

is the addition of the transmitter Li and the cabling

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

Using the Entity Method

The entity method of device to device electrical interconnect in hazardous areas certifies individual products for use in those areas (as opposed to the Loop Method which certifies specific instrumentation loops for use in hazardous areas).

Using the entity method, individual products are certified based on their intrinsic ability to produce/ store ener gy and pro duce/reject h eat. Each part of an instrumentation loop is individually certified and specified with a set of en ti t y para m e te rs .

Because the FLEX Ex system has been designed to use the entity method in hazardous areas, the user can design application-specific instrumentation loops by appropriately matching the devices to be interconnected.

Publication 1797-6.5.2 - February 2001

6-6 Applying FLEX Ex Thermocouple/RTD/mV Input Modules

Entity Parameters

Entity parameters are a system of quantified safe levels for voltage, current, inductance, and capacitance used when connecting multiple devices.

The following table details the entity parameters that must be taken into account when designing a FLEX Ex system.

Table 6.B

Entity Terms: Applied to: CEN E L EC FM/CSA

Maximum output (open-circuit) voltage Power sources U Maximum output (short circuit) current Power sources I Maximum allowed capacitance Power sources C Maximum allowed inductance Power sources L Maximum input voltage Power receivers U Maximum input current Power receivers I Maximum internal capacitance Power receivers C Maximum internal inductance Power receivers L

V I C L V I C L

max

In the table above, power sou rces are devices such as outputs or inputs, and power receivers are devices such as transmitters.

In use, the sum of all the input internal capacitance (C inductance (L capacitance (C

Also, the open-circuit voltage (U exceed the maximum input voltage (U

) in a control loop cannot exceed the allowed

) or allowed inductance (Lo).

) or short circuit current (Io) cannot

) or maximum input current

) or internal

Publication 1797-6.5.2 - Febr uary 2001

Applying FLEX Ex Thermocouple/RT D/mV Input Modules 6-7

General Example

Entity parameters allow a user to design an instrumentation loop by selecting entities such as I/O, wiring and field devices that meet parameters defined by local manufacturers and certifying agencies.

For example, a user may have an input channel and a transmitter sending that channel information.

In this application, the transmitter can withstand:

– maximum input voltage (U

maximum input current (I

)=40V and

)=100mA

while the input will provide:

– maximum output voltage (U

maximum output current (I

)=28V and

)=93mA

In the same application, the transmitter’s:

– maximum internal capacitance (C

maximum internal inductance (L

)=0.5nF and

)=1mH

are both less than the input’s:

– allowed capacitance (C

allowed inductance (L

)=66nF and

)=2.5mH will accept

According to the defined entity parameters, this example’s combination is compatible. Interconnect wiring and communications ports must also be considered in regard to the entity parameters.

Interconnect Wiring

Interconnect wiring is rated with maximum internal capacitance (Ci) and maximum internal inductance (L actual length of cable must be multiplied by these parameters and

considered with the any application.

) on a per foot/meter basis. The

Publication 1797-6.5.2 - February 2001

6-8 Applying FLEX Ex Thermocouple/RTD/mV Input Modules

I/O

The 1797-IRT8 module complies fully to and provides simple entity parameters. This module can directly interf ace 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

IRT8

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

Publication 1797-6.5.2 - Febr uary 2001

IRT8

1.6W

IRT8

1.6W

IRT8

1.6W

IBN16

2.8W

IBN16

2.8W

IBN16

2.8W

IJ2

4.25W

IJ2

4.25W

IE8

7.5W

IRT8

1.6W

OE8

6.3W

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

Applying FLEX Ex Thermocouple/RT D/mV Input Modules 6-9

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.

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 Fiber Hub

EEx ib

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

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

• 10mF of inductance

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

3.5m or 5.8m (1.5mm of special wiring or wiring methods.

and 2.5mm2 wire respectively) without the use

Publication 1797-6.5.2 - February 2001

6-10 Applying FLEX Ex Thermocouple/RTD/mV Input Modules

Chapter Summary

In this chapter you learned how to troubleshoot the FLEX Ex analog I/O modules. Move to chapter 6 to learn about troubleshooting your modules.

Publication 1797-6.5.2 - Febr uary 2001

Chapter

Troubleshooting the FLEX Ex Thermocouple/ RTD/mV Input Module

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

The 1797-IRT8 module has one status indicator for each input (8 in all) and one power indicator that is on when power is applied to the module .

1797-IRT8

PWR

A B C

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

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 1797-6.5.2 - February 2001

Indicates a noncritical channel fault

7-2 Tr oubleshooting the FLEX Ex Thermocouple/RTD/mV Input Module

Repair

Chapter Summary

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 thermocouple/RTD/mV module. Move to Appendix A to see the specifications for your module.

Publication 1797-6.5.2 - Febr uary 2001

Appendix

Specifications

The following specifications apply to the 1797-IRT8 thermocouple/ RTD/mV input module.

Specifications - 1797-IRT8 Thermocouple/RTD Module

Number of Inputs 8 channels IS Input Type EEx ia II B/II C T4, AEx ia IIC T 4, Class I, II, I II Division 1 Group

IS Module Type EEx ib IIB/IIC T4, AEx ib IIC T4, Class I, Division 1 & 2 Group

Input Type Suitable for Pt 100, Pt200, Ni 100, Ni120, Ni200, 10Cu RTD,

Signal Input Range 0 to 500 ohms; -40 to 100mV Settling Time to 99% of Final Value Open RTD Detection Out of range upscale reading Lead Resistance Compensation Transfer Characteristics

Accuracy

Temperature Effect

Indicators 8 red fault indicators

Data Organization

Overrange Alarm Lead Breakage Alarm Fault State

Sensor Mode RTD 2, 3, or 4-wire, TC Sensor Type (e.g. TC, Type B, E, J..., RTD or mV Internal Reference

Junction (TC mode) Output (intrinsically safe) (16 position 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

Specifications continued on next page.

A-G T4

A-D T4

thermocouple Type B, E, J, K, N, R, S, T, TXK/XK (L) Configuration via internal bus

8ms (mV mode,

< 15 ohm total

RTDs: 0.1% of span @ 20 Thermocouples: 0.1% of span @ 20

filter cutoff < 1Hz Cold junction compensation = + 150ppm/

1 green modul e power indicat or

Individually for each channel Individually for each channel Individually for each channel (includes overrange, lead breakage and short circuit) Common to groups of 4 channels (ch 0-3, ch 4-7)

Common to groups of 4 channels (ch 0-3, ch 4-7)

Common to all channels (0

C, 70oC selectable

< 5.8V

< 400mA

Li = Negligible

1.35µF

Ci < Isolation Type Galvanic to DIN EN50020 Galvanic to DIN EN50020 None Galvanic to DIN EN50020

< 9.5V dc

< 1A

Li = Negligible Ci = Negligible

1.6W

F thermocouple)

C (primar y range)

C, filter cutoff < 1Hz

1oC

C, 20oC, 25oC, 30oC, 40oC, 50oC,

1 Publication 1797-6.5.2 - February 2001

A-2 Specifications

Power Dissipation 1.6W Thermal Dissipation Maximum 5.46BTU/hr Module Location Cat. No. 1797-TB3 or -TB3S Terminal Base Unit Conductor Wire Size 12 gauge (4mm

Dimensions 46mm x 94mm x 75mm Weight 200g (approximat e)

Keyswitch Position 2 Environmental Conditions

Operational Temperature

Storage Temperature

Relative Humidity

Shock Operating

Nonoperating

Vibration Agency Certification

CENELEC UL/C-UL

Certificate of Conformity DMT 98 ATEX E 023 X

3/64in (1.2mm) insulation maximum

(1.8in x 3.7in x 2.95in)

-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

II (1) 2G EEx ia/ib IIB/IIC T4 Class I Division 1 and 2 Groups A-D T4 Class I Zone 1 and 2 AEx ib/[ia] IIC T4 Class I Division 1 and 2 Groups A-D T4 Class I Zone 1 AEx ib/[ia] IIC T4

UL, C-UL Certificate Number 99.19699

FM Certificate Number 3009806

) stranded maximum

C (-4 to +158oF)

C (-40 to +185oF)

CE/CENELEC I/O Entity Parameters

Input circuits (+ to -) for ch0 to ch7 (terminals: 0-3; 4-7; 8-11;

12-15; 17-20; 21-24; 25-28; 29-32)

= 9V

= 37mA

= 83mW

Protection Group Allowed

Capacitance

EEx ia IIB 40µF80mH1.7mH/ EEx ia IIC 4.9µF20mH0.4mH/

Allowed

Inductance

Lo/Ro Ratio

Ω Ω

CJC circuits (+ to -) for CJC0 and CJC1 (terminals: 37, 39; 46, 48)

o/Ro

Ratio

Ω Ω

= 9V

= 1mA

= 3mW

Protection Group Allowed

EEx ia IIB 40µF 1H 63mH/ EEx ia IIC 4.9µF1H15mH/

Capacitance

Allowed

Inductance

Input circuits (+ to -) for ch0 to ch7 and CJC circuits (+ to -) for CJC0 and CJC1 (terminals 0-3, 37, 39; 4-7, 37, 39; 8-11, 37, 39; 12-1 5, 37, 39; 17-20, 37, 39; 21-24, 37, 39; 25-28, 37, 39; 29-32, 37, 39; 0-3, 46, 48; 4-7, 46, 48; 8-11, 46, 48; 12-15, 46, 48; 17-20, 46, 48; 21-14, 46, 48; 25-28, 46, 48; 29-32, 46, 48)

o/Ro

Ratio

= 9V

= 38mA

= 86mW

Protection Group Allowed

Capacitance

EEx ia IIB 40µF80mH1.7mH/Ω EEx ia IIC 4.9µF20mH0.4mH/Ω

Allowed

Inductance

Publication 1797-6.5.2 - Febr uary 2001

Specifications A-3

UL, C-UL I/O Entity Parameters

If the 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-Incindive

•

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 fo r Explosive Gas Atmosph eres,

•

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

•

Table 1

Wiring

Method

1 and 2 Any one

Channel Terminals Voc

channel e.g. ch0

0(+), 1(H), 2(L), 3(-) 9.0 37.0 - - A, B 4.9 20.0

37, 38, 39 (CJC0)

46, 47, 48 (CJC1)

0(+), 1(H), 2(L), 3(-)

37, 38, 39 (CJC0)

46, 47, 48 (CJC1)

(V)

9.0 1.0 - - A, B 4.9 1000.0

Isc

(mA)

(V)

- - 9.0 38.0 A, B 4.9 20.0

Groups Ca

(mA)

C, E 14.7 80.0

D, F, G 39.2 160.0

C, E 14.7 1000.0

D, F, G 39.2 1000.0

C, E 14.7 80.0

D, F, G 39.2 160.0

La (mH)

(µF)

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 2

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

Male Bus

Connector

5.8 400 A-G 3.0 3.0

Publication 1797-6.5.2 - February 2001

A-4 Specifications

 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 associated apparatus are less than or equal to V

and Isc or V

of the intrinsically safe apparatus and the approved values of C of the associated apparatus are greater than C

+ C

cable

and It of the

and I

max

and Li + L

max

and La

cable

respectively for the intrinsically safe apparatus.

ó Simple apparatus is defined as a device which neither generates

nor stores more than 1.2V, 0.1A, 20µJ, or 25mW.

ì 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.

ö This module, 1797-IRT8, must be used with terminal base

1797-TB3 or 1797-TB3S.

ú Terminals 36 and 49 shall not be connected.

÷ WARNING: Substitution of components may impair intrinsic

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

B-A

FLEX Ex Temperature Input I/O Module

LEDs

Female Bus Connection

Field Wiring Terminals

Allen-Bra dley

8 Point RTD/Thermocouple mV Input Module

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

1797- IRT8

7 PWR6543210

Key Position for Terminal Base Insertion

Male Bus Connection

Ter minal Base Key

Terminal Base

Publication 1797-6.5.2 - Febr uary 2001

Specifications A-5

IMPORTANT

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 ó or I.S. device with Entity Concept parameters appropria te for connection to associated apparatus with Entity Concept parameters listed in Table 1.



max

CJC1 CJC2

37 38 39 46 47 48

ch0

0(+) 1(H) 2(L) 3(-)

ch1

4(+) 5(H) 6(L) 7(-)

ch2

8(+) 9(H) 10(L) 11(-)

ch3

12(+) 13(H) 14(L) 15(-)

ch4

17(+) 18(H) 19(L) 20(-)

ch5

21(+) 22(H) 23(L) 24(-)

ch6

25(+) 26(H) 27(L) 28(-)

ch7

29(+) 30(H) 31(L) 32(-)

, I

, Ci, Li)

max

Female Bus Connector V

=5.8V

max

=400mA

max

=1350nF

=negligible

max

=negligible

Male Bus Connector

1797-IRT8

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

To any intrinsically safe device or associated apparatus with Entity Concept

5.8V; Isc < 400mA.

=1A

=9.5V

34 35

To any intrinsically safe device or associated apparatus w ith Entity

51 50

Concept

< 9.5V; Isc < 1A.

To any IS device with Entity

Concept

, I

, Ci, Li) appropriate f or

max

connection to associated apparatus with Entity Concept par ameters listed in

16 33

÷úö

40 41 42 43 44 45

Table 2.

Shield Connection Only



parameters of Voc



parameters of



parameters of

FM I/O Entity Parameters

For detailed certification information, refer to the FLEX Ex System Certification Reference Manual, publication 1797-6.5.6

f this product has the FM mark, it has been des igned, 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 Gen eral

Requirements

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

Measuring and Process Control Equipment

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

Publication 1797-6.5.2 - February 2001

A-6 Specifications

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).

Table 1

Wiring

Method

1 and 2 Any one

Channel Terminals Voc (V) Isc

channel e.g.

ch0

0(+), 1(H), 2(L),

3(-)

37, 38, 39

(CJC0)

46, 47, 48

(CJC1)

0(+), 1(H), 2(L),

3(-)

37, 38, 39

(CJC0)

46, 47, 48

(CJC1)

9.0 37.0 - - A, B 3.0 20.0

9.0 1.0 - - A, B 3.0 1000.0

- - 9.0 38.0 A, B 3.0 20.0

(mA)

Vt (V) It

(mA)

Groups Ca (µF) La (mH)

C, E 9.0 60.0

D, F, G 24.0 160.0

C, E 9.0 1000.0

D, F, G 24.0 1000.0

C, E 9.0 60.0

D, F, G 24.0 160.0

Table 2

Terminals V

Male Bus

Connector

(V) It (mA) Groups Ca (µF) La (µH)

5.8 400 A-G 3.0 3.0

 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 and I

of the associated apparatus are less than or equal to V

of the intrinsically safe apparatus and the approved values of C of the associated apparatus are greater than C

+ C

cable

and Isc or Vt

and I

max

and Li + L

max

and La

cable

respectively for the intrinsically safe apparatus.

ó Simple apparatus is defined as a device which neither generates

nor stores more than 1.2V, 0.1A, 20µJ, or 25mW.

ì 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.

ö This module, 1797-IRT8, must be used with terminal base

1797-TB3 or 1797-TB3S.

ú Terminals 36 and 49 shall not be connected.

Publication 1797-6.5.2 - Febr uary 2001

÷ WARNING: Substitution of components may impair intrinsic

safety.

Specifications A-7

ATTENTION

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

B-A

FLEX Ex Temperature Input I/O Module

Allen-Bra dley

8 Point RTD/Thermocouple mV Input Module

1797- IRT8

7 PWR6543210

Key Position for T erminal Base Insertion

LEDs

Female Bus Connection

Field Wiring Terminals

Male Bus Connection

T erminal Base Key

Terminal Bas

42020

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

Publication 1797-6.5.2 - February 2001

A-8 Specifications

Hazardous (Classified) Location Class I, Zone 0 Group 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 ó or FM approved device with Entity Concept parameters appropriate for connection to associated apparatus



, I

, Ci, Li)

max

with Entity Concept parameters listed in Table 1.

CJC0 CJC1

37 38 39 46 47 48

ch0

ch1

ch2

ch3

ch4

ch5

ch6

ch7 29(+)

0(+) 1(H) 2(L) 3(-)

4(+) 5(H) 6(L) 7(-) 8(+) 9(H) 10(L) 11(-) 12(+) 13(H) 14(L) 15(-)

17(+) 18(H) 19(L) 20(-)

21(+) 22(H) 23(L) 24(-)

25(+) 26(H) 27(L) 28(-)

30(H) 31(L) 32(-)

Female Bus Connector V

=5.8V

max

=400mA

max

=1350nF

=negligible

=9.5V

max

=1A

max

=negligible

Male Bus Connector

÷úö

1797-IRT8

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

For connection to other modules, refer to the General FM Certification Information in publication 1797-6.5.6.

34 35

51 50

From FM approved devices, 1797-PS2N.

For connection to other modules, refer to the General FM Certification Information in publication 1797-6.5.6.

16 33 40 41 42 43 44 45

Shield Connection Onl

42485

Publication 1797-6.5.2 - Febr uary 2001

Attention: Avoid electrostatic charge.

Appendix

Programming the FLEX Ex I/O Modules Using RIO

What this Chapter Contains

Enter Block Transfer Instructions

Read this appendix to pro gram the 1797-I RT8 thermocouple/RTD/mV input module.

The FLEX Ex thermocouple/RTD/mV modules communicate with the PLC processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

Before you configure the module, you need to enter block transfer instructions into your ladder logic. The following example programs illustrate the minimum programming required for communication to take place between the module and a PLC processor. These programs can be modified to suit your application requirements.

A configuration block transfer write (BTW) is initiated when the module is first powered up, and subsequently only when the programmer wants to enable or disable features of the module. The configuration BTW sets the bits which enable the programmable features of the module, such as filters and signal ranges, etc. Block transfer reads are performe d to retrieve info r matio n from the module.

Block transfer read (BTR) programming moves status and data from

the module to the processor’s data table. The processor user program initiates the request to transfe r data fro m the modu le to the proc essor. The transferred words contain module status, channel status and input data from the module.

Your program should monitor status bits, block transfer read and block transfer write activity.

1 Publication 1797-6.5.2 - February 2001

B-2 Programming the FLEX Ex I/O Modules Using RIO

Using the PLC-5C Processor

PLC-5/250 Processor Program Example

Rung 1STEPO:1 The IRT8 module is located in rack 14, I/O group 1, slot 0. The data obtained by the PLC-5/250 processor from the IRT8 module is placed in the data table starting at 2BTD5:101, and with the default length of 0, is 11 words long. The length can be any number between 0 and 11.

IRT8 BTR

Enable Bit

BR141:0

Block transfer instructions with the PLC-5C processor use a control file and a data file. The block transfer control file contains the data table section for module location , the add ress of t he b lock transf er data f ile and other related data. The block transfer data file stores data that you want transferred to the module (when programming a BTW) or from the module (when programming a BTR).

The programming terminal will automatically select the control file based on rack, group and module, and whether it is a read or write.

A different block transfer control file is used for the read and write instructions for your module. A different block transfer

control file is required for every module.

IRT8 BTW

Enable Bit

BW141:0

BTR

BLOCK TRANSFER READ Rack Group Slot Control Block Data File BT Length Continuous BT Timeout 4

IRT8 BTR Control File

BR141:0

2BTD5:101

Rung 1STEPO:1 The IRT8 module is located in rack 14, I/O group 1, slot 0. The data sent to the IRT8 module from the PLC-5/250 processor is from the data table starting at 2BTD5:1, and with a default length of 0, is 4 words long. Valid BTW lengths: 0, 1, 2, 3, and 4.

IRT8 BTR

Enable Bit

BR141:0

IRT8 BTW

Enable Bit

BW141:0

IRT8 BTW

BTW

BLOCK TRANSFER WRITE Rack Group Slot Control Block Data File BT Length Continuous BT Timeout 4

Control File

BW141:0

2BTD5:1

Publication 1797-6.5.2 - Febr uary 2001

Index

Numerics

1797-IRT8

entity parameters

CE/CENELEC A-5 UL A-5

Alarms

1797-IE8 module

1-3 local fault 1-3 overrange 1-3 remote fault 1-3 underrange 1-3

block transfer programming

PLC5/250 processor

B-2

Calibration

Module command words Tools and equipment 5-2

calibration

periodic tools 5-2

CE/CENELEC

entity parameters

5-1

1797-IRT8 A-5

5-2

CE/CENELEC

1797-IRT8 A-5

inputs 1-1 installation

3-8

module

shipping stat e

calibration 5-1

module installation 3-8 mounting

on terminal base

mounting kit

cat. no. 1794NM1

3-8

3-6

panel/wall mounting 3-6 PLC5/250 processor B-2

tools

calibration

5-2

drilling dim e ns ions

wall/panel mounting

Entity parameters

3-7

entity paramete rs

1797-IRT8 A-5

wall/panel mounting 3-6

Publication 1797-6.5.2 - February 2001

2 Index

Publication 1797-6.5.2 - February 2001

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1797-IRT8 Pub. No. 1797-6.5.2 Pub. Date February 2001 Part No. 955126-46

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Publication 1797-6.5.2 - February 2001 PN 955126-46

Rockwell Automation 1797-IRT8 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Using This Manual

Preface

Why Read this Manual

Who Should Read this Manual

About the Vocabulary

What this Manual Contains

For Additional Information

In Summary

Table of Contents

About the FLEX Ex Thermocouple/RTD/mV Input Module

What this Chapter Contains

What the FLEX Ex Thermocouple/RTD/mV Modules Do

How FLEX Ex Thermocouple/RTD/mV Modules Communicate with Programmable Controllers

Features of Your Module

Using Alarms on the 1797-IRT8 Module

Chapter Summary

What this Chapter Contains

Using Module Alarms

Chapter Summary

How to Install Your FLEX Ex Thermocouple/ RTD/mV Module

What this Chapter Contains

Before You Install Your Analog Module

Compliance to European Union Directives

Installation in Zone 1

Electrostatic Charge

Removal and Insertion Under Power

Installing the Module

Wiring the Terminal Base Units

Connecting Wiring to the FLEX Ex Thermocouple/ RTD/mV Module

Grounding the Module

Chapter Summary

What this Chapter Contains

Using Programming Software in Your FLEX Ex Application

About the ControlNet Ex Adapter

Communication Over the FLEX Ex Backplane

I/O Structure

Fault State Data

Device Actions

Chapter Summary

Calibrating Your Module

What This Chapter Contains

Tools and Equipment

Calibration Method

Applying FLEX Ex Thermocouple/RTD/mV Input Modules

What this Chapter Contains

Evaluate the Application

Define the Area Classification

Select Protection Method(s)

Match Field Devices and I/O Modules

Optimize Power Distribution

Chapter Summary

Troubleshooting the FLEX Ex Thermocouple/ RTD/mV Input Module

What this Chapter Contains

Status Indicators

Repair

Chapter Summary

Specifications

CE/CENELEC I/O Entity Parameters

UL, C-UL I/O Entity Parameters

FM I/O Entity Parameters

Programming the FLEX Ex I/O Modules Using RIO

What this Chapter Contains

Enter Block Transfer Instructions

Using the PLC-5C Processor

Index