Rockwell Automation 1734-IT2I User Manual

POINT I/O Thermocouple and RTD Modules

Catalog Numbers 1734-IR2, 1734-IR2E and 1734-IT2I User Manual

WARNING

IMPORTANT

ATTENTION

SHOCK HAZARD

BURN HAZARD

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1 Automation sales office or online at http://literature.rockwellautomation.com

available from your local Rockwell

) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

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

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

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

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

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

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

Identifies information about practices or circumstances that can lead to: personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.

Labels may be on or inside the equipment, such as a drive or motor, to alert people that dangerous voltage may be present.

Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous temperatures.

Allen-Bradley, Rockwell Automation, POINT I/O, RSLinx, RSLogix 5000, and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

Publication 1734-UM004F-EN-E - December 2012

Summary of Changes

About POINT I/O Modules

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

New and Revised Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Change Bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Preface

Who Should Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Common Techniques Used in this Manual. . . . . . . . . . . . . . . . . . . . . . 10

Chapter 1

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Selecting a Module Input Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Communicating with Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Default Data Map for the Thermocouple Input Module

(catalog number 1734-IT2I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Default Data Map for the RTD Input Module

(catalog numbers 1734-IR2, and 1734-IR2E). . . . . . . . . . . . . . . . . 13

Data Format (1734-IT2I, 1734-IR2, and 1734-IR2E modules) . . 14

Use Module Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Overrange Alarm (1734-IT2I, 1734-IR2, and

1734-IR2E modules) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Underrange Alarm (1734-IT2I, 1734-IR2, and

1734-IR2E modules) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Level Alarms (1734-IT2I, 1734-IR2, and

1734-IR2E modules) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Open-wire Alarm (1734-IT2I, 1734-IR2, and

1734-IR2E modules) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cold Junction Compensation (1734-IT2I module) . . . . . . . . . . . . . . . 16

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Chapter 2

Install the Module

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Preventing Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . 17

Environment and Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Install the Mounting Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Install an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Install the Removable Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . 21

Remove a Mounting Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Wire the Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chapter 3

Configure Your Module

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Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Commissioning a Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

iv Table of Contents

Using the RSNetWorx Commissioning Tool. . . . . . . . . . . . . . . . . 26

Use Sequential Auto Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Use Third Party Configuration Software . . . . . . . . . . . . . . . . . . . . 27

Add the Adapter to Your Network. . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Add I/O Modules to Your Network POINTBus. . . . . . . . . . . . . 28

Set the Thermocouple Input Module Parameters Using RSNetWorx 30

Configure Your Thermocouple Input Module. . . . . . . . . . . . . . . . . . . 32

Basic Set-up Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Advanced Setup Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Advanced Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Set the RTD Input Module Parameters Using RSNetWorx . . . . . . . . 37

Configure Your RTD Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Basic Setup Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Advanced Setup Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Basic Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Advanced Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Check I/O Status and View the EDS File . . . . . . . . . . . . . . . . . . . . . . 44

1734-IT2I module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

1734-IR2 and 1734-IR2E modules. . . . . . . . . . . . . . . . . . . . . . . . . 45

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Calibrate Your Module

Troubleshoot the Module

Configure Modules in RSLogix 5000 Software

Chapter 4

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

When and How to Calibrate Your Module . . . . . . . . . . . . . . . . . . . . . 47

Calibration Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Tools and Equipment Required to Calibrate

Your Thermocouple Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Calibrate the Thermocouple Input Module . . . . . . . . . . . . . . . . . . . . . 48

Access Calibration Parameters in RSNetWorx . . . . . . . . . . . . . . . 49

Input (mV) Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Cold Junction Compensation Calibration . . . . . . . . . . . . . . . . . . . 53

Tools and Equipment Required to Calibrate

Your RTD Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Calibrate the RTD Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Chapter 5

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Interpret the Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Appendix A

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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Calculate Absolute Accuracy and Accuracy Drift

Index

Table of Contents v

Understanding Data, Connection, and

Communication Formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Configure Your Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Use the Help Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Working with Dialogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Work with Dialogs for RTD Modules . . . . . . . . . . . . . . . . . . . . . . 65

Work with Dialogs for Thermocouple Modules . . . . . . . . . . . . . . 70

Appendix B

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Calculate with Formulas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Absolute Accuracy Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Accuracy Drift Formula. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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vi Table of Contents

Notes:

Publication 1734-UM004F-EN-E - December 2012

Summary of Changes

This publication contains new and revised information not in the last release.

New and Revised Information

See the table for a summary of the major changes in this manual.

Revised to include Chapter

New Appendix on Absolute Accuracy and Accuracy Drift calculation Appendix B

Change Bars

Change bars (as shown with this paragraph) show the areas in this manual that differ from previous editions and indicate the addition of new or revised information.

vii Publication 1734-UM004F-EN-E - December 2012

viii Summary of Changes

Notes:

Publication 1734-UM004F-EN-E - December 2012

Preface

Read this preface to familiarize yourself with the rest of the manual. It provides information concerning:

• who should use this manual

• the purpose of this manual

• related documentation

• conventions used in this manual

Who Should Use this Manual

Purpose of this Manual

You must be able to use your selected configuration software to set up and calibrate these modules. You must have the capability to download and use files.

We assume you know how to do this in this manual. If you do not, refer to your software user manuals or online help before attempting to use these modules.

This manual describes how to install, configure and troubleshoot your Thermocouple and Resistance Termperature Detector (RTD) modules.

For Information About See

About POINT I/O Modules Chapter 1 Install the Module Chapter 2 Configure Your Module Chapter 3 Calibrate Your Module Chapter 4 Troubleshoot the Module Chapter 5 Configure Modules in RSLogix 5000 Software Appendix A Calculate Absolute Accuracy and Accuracy Drift Appendix B

Common Techniques Used in this Manual

Information about how to install 1734-VHSC5 and 1734-VHSC24, Series C POINT I/O 5V DC and 24V DC Very High Speed Counter Modules.

Information about how to install 1734-TB and -TBS POINT I/O Wiring Base Assemblies.

Information about how to install 1734-TB3 and -TB3S POINT I/O Wiring Base Assemblies.

The following conventions are used throughout this manual:

• Bulleted lists such as this one provide information, not procedural steps.

• Numbered lists provide sequential steps or hierarchical information.

• Italic type is used for emphasis.

Publication 1734-UM004F-EN-E - December 2012

About POINT I/O Modules

Chapter

Overview

Module Features

Read this chapter to familiarize yourself with configurable features on the 1734-IT2I, 1734-IR2, and 1734-IR2E modules. The following table lists where to find specific information in this chapter.

Topic Page

Module Features 1 Selecting a Module Input Type 2 Communicating with Your Module 2 Use Module Alarms 5 Cold Junction Compensation (1734-IT2I module) 6 Chapter Summary 6

The module features include:

Input type

•Sensor type

• Data formats

• Preset temperature selection

•Fault mode

• Overrange alarms

•Underrange alarms

• Fault alarms

You must use your programming software, like Rockwell Automation RSNetWorx, to configure these features. See this chapter for a brief description of each module feature. Use the online help included with your programming software to perform specific configuration. You can find the EDS files for this module at www.ab.com/networks/eds/.

1 Publication 1734-UM004F-EN-E - December 2012

2 About POINT I/O Modules

Selecting a Module Input Type

The 1734-IT2I module consists of two isolated millivolt inputs (+70 mV). Configure the module to do the linearization necessary for thermocouple inputs. See the table for a list of supported thermocouple input types.

Supported Sensor Types – Thermocouple

mV (default) -70...+70 mV B 572...3272 °F (300...1800 °C) C 32...4199 °F (0...2315 °C) E -418...+1832 °F (-250...+1000 °C) J -346...+2192 °F (-210...+1200 °C) K -418...+2502 °F (-250...+1372 °C) N -418...+2372 °F (-250...+1300 °C) R 32...3214 °F (0...1768 °C) S 32...3214 °F (0...1768 °C) T -418...+752 °F (-250...+400 °C)

The 1734-IR2 consists of two RTD inputs (0...600 W). Configure the module to do the linearization necessary for RTD inputs. See the table for a list of supported input types.

Communicating with Your Module

Supportted Sensor Types – RTD

100 Pt α = 0.00385 Euro -328...1598 °F (-200...+870 °C) 200 Pt α = 0.00385 Euro -328...1166 °F (-200...+630 °C) 100 Pt α = 0.003916 U.S. -328...1166 °F (-200...+630 °C) 200 Pt α = 0.003916 U.S. -328...1166 °F (-200...+630 °C) 10 Cu α = 0.00427 -328...500 °F (-200...+260 °C) 100 Ni α = 0.00618 -76...+482 °F (-60...+250 °C) 120 Ni α = 0.00618 -76...+482 °F (-60...+250 °C) 120 Ni α = 0.00672 -76...+482 °F (-60...+250 °C)

The 1734-IR2E consists of two RTD inputs (0...200 W). Configure the module to do the linearization necessary for RTD inputs. See the table for a list of supported input types.

I/O messages are sent to (consumed) and received from (produced) the POINT I/O modules. These messages are mapped into the processor’s memory. The Thermocouple input module produces 8 bytes of input data (scanner Rx) and fault status data. It does not consume I/O data (scanner Tx).

Publication 1734-UM004F-EN-E - December 2012

The RTD input module produces 6 bytes of input data (scanner Rx) and fault status data. It does not consume I/O data (scanner Tx).

Default Data Map for the Thermocouple Input Module (catalog number 1734-IT2I)

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

Produces (scanner Rx) Input Channel 0 - High Byte Input Channel 0 - Low Byte

Input Channel 1 - High Byte Input Channel 1 - Low Byte Status Byte for Channel 1 Status Byte for Channel 0 OR UR HHA LLA HA LA CM CF OR UR HHA LLA HA LA CM CF OR UR Cold Junction Temperature

(Selectable: Channel 0, Channel 1, or Average of both Channel 0 and 1) Consumes (scanner Tx) No consumed data Where: OR = Overrange; 0 = no error, 1 = fault (value went above selected range)

UR = Underrange; 0 = no error, 1 = fault (value went below selected range) HHA = High/High Alarm; 0 = no error, 1 = fault (value went below setpoint LLA = Low/Low Alarm; 0 = no error, 1 = fault (value went below setpoint HA = High Alarm; 0 = no error, 1 = fault (value went below setpoint LA = Low Alarm; 0 = no error, 1 = fault (value went below setpoint) CM = Calibration Mode; 0 = normal, 1 = calibration mode CF = Channel Fault status; 0 = no error, 1 = fault

About POINT I/O Modules 3

Default Data Map for the RTD Input Module (catalog numbers 1734-IR2, and 1734-IR2E)

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

Produces (scanner Rx) Input Channel 0 - High Byte Input Channel 0 - Low Byte

Input Channel 1 - High Byte Input Channel 1 - Low Byte Status Byte for Channel 1 Status Byte for Channel 0

OR UR HHA LLA HA LA CM CF OR UR HHA LLA HA LA CM CF Consumes (scanner Tx) No consumed data Where: OR = Overrange; 0 = no error, 1 = fault (value went above selected range)

UR = Underrange; 0 = no error, 1 = fault (value went below selected range)

HHA = High/High Alarm; 0 = no error, 1 = fault (value went below setpoint)

LLA = Low/Low Alarm; 0 = no error, 1 = fault (value went below setpoint)

HA = High Alarm; 0 = no error, 1 = fault (value went below setpoint)

LA = Low Alarm; 0 = no error, 1 = fault (value went below setpoint)

CM = Calibration Mode; 0 = normal, 1 = calibration mode

CF = Channel Fault status; 0 = no error, 1 = fault

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4 About POINT I/O Modules

Data Format (1734-IT2I, 1734-IR2, and 1734-IR2E modules)

You must choose a module data format in your user program. Select the format. These are four predefined scales and one custom scale.

Data Formats

mV Custom Scale

⋅ C Celsius Predefined Scale ⋅ F Fahrenheit ⋅ KKelvin ⋅ R Rankine

°C, F, °R, and °K returns data in tenths of a degree (250 implies 25.0 °).

For the 1734-IR2E, (250 implies 2.50

⋅ C, ⋅ F, ⋅ R, and ⋅ K returns data in hundreths of a degree

⋅ ). If scaling is set to 10,000 and 20,000, the module returns

hundredths of an ohm (12345 implies 123.45).

For the 1734-IR2, if using ohms, the default data returned is in tenths of ohms (1234 implies 123.4 Ω).

For the 1734-IT2, if using mV, the default data is returned in hundredths of a mV, or tens of a μV (3500 implies 35.00

⋅ ).

If the input scale is custom scale, you can specify scaling points as shown in the table.

1734-IT2I Thermocouple Input Module 1734-IR2 RTD Input Module Thermocouple

Ty pe

mV 0 mV 70mV Ohms 100 Ω 500 Ω Type B 212 °F (100 °C) 1832 °F (1000 °C) 100 Ω Ptα = 0.00385 Euro 32 °F (0 °C) 932 °F (500 °C) Type C 32 °F (0 °C) 4199 °F (2315 °C) 200 Ω Ptα = 0.00385 Euro 32 °F (0 °C) 932 °F (500 °C) Type E 32 °F (0 °C) 1832 °F (1000 °C) 100 Ω Ptα = 0.003916 U.S. 32 °F (0 °C) 932 °F (500 °C) Type J 32 °F (0 °C) 1832 °F (1000 °C) 200 Ω Ptα = 0.003916 U.S. 32 °F (0 °C) 932 °F (500 °C) Type K 32 °F (0 °C) 1832 °F (1000 °C) 10 Ω Cuα = 0.00427 32 °F (0 °C) 482 °F (250 °C)

Low Scaling Endpoint

High Scaling Endpoint

RTD Type Low Scaling

Endpoint

High Scaling Endpoint

Type N 32 °F (0 °C) 1832 °F (1000 °C) 100 Ω Niα = 0.00618 32 °F (0 °C) 482 °F (250 °C) Type R 32 °F (0 °C) 1832 °F (1000 °C) 120 Ω Niα = 0.00672 32 °F (0 °C) 482 °F (250 °C) Type S 32 °F (0 °C) 1832 °F (1000 °C) 120 Ω Niα = 0.00618 32 °F (0 °C) 482 °F (250 °C) Type T 32 °F (0 °C) 212 °F (100 °C)

Publication 1734-UM004F-EN-E - December 2012

1734-IR2E RTD Input Module

About POINT I/O Modules 5

Use Module Alarms

RTD Type Low Scaling

Endpoint

O hms 100 Ω 200 Ω 100 Ω Ptα = 0.00385 Euro 32 °F (0 °C) 572 °F (300 °C)

POINT I/O modules are capable of generating the following alarms.

•Overrange

•Underrange

• Level (low-low, low, high, high-high)

• Cold-junction Compensation (CJC) Fault (1734-IT2 only)

•Open-wire Detection

High Scaling Endpoint

Overrange Alarm (1734-IT2I, 1734-IR2, and 1734-IR2E modules)

The channel overrange alarm is set if the input is greater than the maximum temperature (thermocouple or RTD range dependent), millivolt (+75 mV) or resistance (600 Ω) range value, or above the maximum range of the thermocouple or RTD.

The cold junction compensator has its own overrange alarm. If the CJC temperature goes above 70 ⋅ C, the overrange alarm is set.

Underrange Alarm (1734-IT2I, 1734-IR2, and 1734-IR2E modules)

The channel underrange alarm is set if the input is less than the minimum temperature (thermocouple or RTD range dependent), millivolt (-75 mV) or resistance (10 Ω) range value, or below the minimum range of the thermocouple or RTD.

The cold junction compensator has its own underrange alarm. If the CJC temperature goes below 0 ⋅ C, the underrange alarm is set.

Level Alarms (1734-IT2I, 1734-IR2, and 1734-IR2E modules)

The following level alarms are available.

•Low

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6 About POINT I/O Modules

• Low-Low

•High

•High-High

When the channel input goes below a low alarm or above a high alarm, a bit is set in the data table. All Alarm Status bits can be read individually or by reading the Channel Status Byte (Bits 2...5 for channel 0; bits 10...13 for channel 1).

You can configure each channel alarm individually.

Open-wire Alarm (1734-IT2I, 1734-IR2, and 1734-IR2E modules)

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

Cold Junction Compensation (1734-IT2I module)

Chapter Summary

When using thermocouples, cold junction compensation is required at the termination of the thermocouple wire. Accomplish a cold junction in the following ways:

• Enter an estimated temperature.

• Use a 1734-TBCJC mounting base (recommended).

• Use external cold junction compensators.

Entering an estimated temperature is the least accurate way for CJC compensation. Using the compensation built-into the 1734-TBCJC provides the easiest and most accurate way.

An open CJC causes the CJC input to point to the maximum temperature value for the selected input type. This causes an alarm to be set. Once the alarm is issued, it remains active as long as the input signal is faulted (above maximum).

In this chapter you were given an overview of the 1734 family of modules. The next chapter walks you through installing your module.

Publication 1734-UM004F-EN-E - December 2012

Install the Module

ATTENTION

Chapter

Overview

Read this chapter for information about how to install and wire RTD and thermocouple modules. The following table lists where to find specific information in this chapter.

Topic Page

Install the Mounting Base 8 Install an I/O Module 10 Install the Removable Terminal Block 12 Remove a Mounting Base 13 Wire the Modules 14 Chapter Summary 16

The RTD module uses a 1734-TB or 1734-TBS mounting base assembly with 1734-RTB removable terminal block (RTB) for RTD wiring.

The thermocouple module uses a 1734-TBCJC mounting base assembly with 1734-CJCRTB removable terminal block with built-in cold junction compensation for thermocouple inputs.

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• If available, use a static-safe workstation.

• When not in use, store the equipment in appropriate static-safe packaging.

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8 Install the Module

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 m (6562 ft) without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

Install the Mounting Base

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosure. Also, see the appropriate sections in this publication, as well as the Allen-Bradley publication 1770-4.1 Automation Wiring and Grounding Guidelines, for additional installation requirements pertaining to this equipment.

The wiring base assembly (1734-TB or 1734-TBS) consists of the following:

• Mounting base, catalog number 1734-MB

• Removable terminal block, catalog number 1734-RTB or 1734-RTBS

The wiring base assembly (1734-TBCJC) consists of the following:

• Mounting base, catalog number 1734-MB

• Removable terminal block, catalog number 1734-RTBCJC

, Industrial

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Install the Module 9

ATTENTION

Therm

ocou

ple

Input

Module

Status

Network

Status

4 IT

Removable terminal block (1734-RTBCJC)

Insertable I/O module

RTB Removal Handle

Slide-in writable label

Interlocking side pieces

Mechanical keying (orange)

Module wiring diagram

DIN rail locking screw (orange)

Module locking mechanism

Mounting base

46008

POINT I/O is grounded through the DIN rail to chassis ground. Use zinc-plated, yellow-chromated steel DIN rail to assure proper grounding. The use of DIN rail materials (such as aluminum and plastic) that can corrode, oxidize, or are poor conductors can result in improper or intermittent grounding.

Secure DIN rail to mounting surface approximately every 200 mm (7.8 in.).

You can install the assembly, or just the mounting base.

Follow this procedure to install the mounting base/wiring base assembly on the DIN rail.

1. Position the mounting base (wiring base) assembly vertically above the installed units (adapter, power supply, or existing module).

2. Slide the mounting base down so that the interlocking side pieces engage the adjacent module or adapter.

Do not discard the end cap shipped with an adapter or communication interface. Use this end cap to cover the exposed interconnections on the last mounting base on the DIN rail. Failure to do so could result in equipment damage or injury from electric shock.

1734-IT2I shown

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10 Install the Module

46003

WARNING

3. Press firmly to seat the mounting base on the DIN rail. The mounting base snaps into place.

Module Status

Network Status

ODE:

24VDC Source Output

1734 OB4E

4. Repeat this procedure for the next mounting base assembly.

Install an I/O Module

Install the module before or after base installation. Make sure you correctly keyed the mounting base before installing the module into the mounting base. In addition, make sure you positioned the mounting base locking screw horizontal, referenced to the base.

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

Be sure that power is removed or the area is nonhazardous before proceeding. Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance that can affect module operation.

1. Using a bladed screwdriver, rotate the keyswitch on the mounting base clockwise till the number required for the type of module you are installing aligns with the notch in the base.

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Install the Module 11

Turn the keyswitch to align the number with the notch.

Notch

(position 6 shown)

Make sure the DIN rail locking screw is in the horizontal position.

1734-RTD - Position 6 1734-IT2I - Position 6

2. Make certain the DIN rail locking screw is in the horizontal position, noting that you cannot insert the module if the locking mechanism is unlocked.

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12 Install the Module

24VD

Source

Output

Module

Status

Netw

ork

Status

1734

OB4E

NODE:

44012

3. Insert the module straight down into the mounting base and press to secure, locking the module into place.

Install the Removable Terminal Block

A removable terminal block comes with your mounting base assembly. To remove, pull up on the RTB handle to remove the base and replace, as necessary, without removing any of the wiring. To reinsert the removable terminal block, proceed as follows.

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Install the Module 13

WARNING

Hook the RTB end into the mounting base end, and rotate until it locks into place.

WARNING

1. Insert the RTB end opposite the handle into the base unit, which has a

curved section that engages with the mounting base.

2. Rotate the terminal block into the mounting base until it locks itself in place.

3. If an I/O module is installed, snap the RTB handle into place on the module.

Remove a Mounting Base

When you connect or disconnect the removable terminal block (RTB) with field-side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

To remove a mounting base, you must remove any installed module, and remove the removable terminal block (if wired).

When you connect or disconnect the removable terminal block (RTB) with field-side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

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

1. Unlatch the RTB handle on the I/O module.

2. Pull on the RTB handle to remove the removable terminal block.

3. Press in on the module lock on the top of the module, and pull up on

the I/O module to remove from the base.

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14 Install the Module

WARNING

43923

Module status

Network status

Status of input 0

Status of input 1

Shield

4. Remove the module to the right of the base you are removing, noting that the interlocking portion of the base sits under the adjacent module.

5. Use a small-bladed screwdriver to rotate the orange DIN rail locking screw on the mounting base to a vertical position. releasing the locking mechanism.

6. Lift the mounting base straight up to remove.

Wire the Modules

To wire the thermocouple input modules, refer to the figures.

If you connect or disconnect wiring while the field-side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

1734-IT2I Module Overview

Module Status

Network Status

NODE:

Thermocouple

Input

1734

IT2

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Wiring Diagram

Shield

Thermocouple 0

Thermocouple 1

0+ = Input channel 0 High 0- = Input channel 0 Low 1+ = Input channel 1 High 1- = Input channel 1 Low Shld = Shield

46000

Module Status

Network Status

Status of Input 0

Status of Input 1

Input 0/A HIgh Input

Input 0/B Low Input

RET 0

Shield

Input 1/A High Input

Input 1/B Low Input

Shield

RET 1

Input Channel Power Limits

Channel Input High Input Low Shield

0+ 4 3 0- 5 1+ 6 3 1- 7 Power is provided by the internal power bus.

Install the Module 15

To wire RTD modules, refer to the figures.

1734-IR2, 1734-IR2E Module Overview

Module Status

Network Status

NODE:

RTD

Input

1734

IR2

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16 Install the Module

In 0/A In 1/A

In 1/BIn 0/B

RET 0 RET 1

ShieldShield

3-wire RTD

In = Input channel RET = Sensor return Shield = Sensor cable shield

2-wire RTD

When using 2-wire RTDs, Insert 1 Ω resistor IN/B to RET.

1 Ω resistor

Wiring Diagram

Input Channel Power Limits

Channel High Signal (+) Low Signal (-) Return Shield

In 0/A 0 4 6 In 0/B 2 In 1.A 1 5 7

Chapter Summary

In 1/B 3

This chapter explained how to install and wire the modules. The next chapter describes how to configure your POINT I/O Thermocouple and RTD Modules.

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