Rockwell Automation 1762-IT4 User Manual

MicroLogix™ 1200 Thermocouple/mV Input Module

(Catalog Number 1762-IT4)

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 these products 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. In no event will Allen-Bradley be responsible or liable for indirect or consequential damage resulting from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples shown in this publication 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 publication, notes may be used to make you aware of safety considerations. The following annotations and their accompanying statements help you to identify a potential hazard, avoid a potential hazard, and recognize the consequences of a potential hazard:

WARNING

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

ATTENTION

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

IMPORTANT

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

Overview

Preface

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

How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Manual Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-2

Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . P-2

Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . P-3

Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . P-3

Technical Product Assistance . . . . . . . . . . . . . . . . . . . . P-3

Your Questions or Comments on the Manual . . . . . . . . P-3

Chapter 1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Thermocouple/mV Inputs and Ranges . . . . . . . . . . . . . 1-1

Data Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Filter Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

General Diagnostic Features. . . . . . . . . . . . . . . . . . . . . 1-4

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Module Field Calibration . . . . . . . . . . . . . . . . . . . . . . . 1-6

Installation and Wiring

Chapter 2

Compliance to European Union Directives . . . . . . . . . . . . . 2-1

EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Hazardous Location Considerations . . . . . . . . . . . . . . . 2-3

Prevent Electrostatic Discharge . . . . . . . . . . . . . . . . . . . 2-3

Remove Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Selecting a Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Minimum Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

System Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Field Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

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Table of Contents ii

Module Data, Status, and Channel Configuration

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Terminal Block Layout . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Labeling the Terminals. . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Wiring the Finger-Safe Terminal Block . . . . . . . . . . . . . 2-10

Wire Size and Terminal Screw Torque . . . . . . . . . . . . . 2-11

Terminal Door Label . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Wiring the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Cold Junction Compensation . . . . . . . . . . . . . . . . . . . . . . . 2-13

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Chapter 3

Module Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Accessing Input Image File Data . . . . . . . . . . . . . . . . . . . . 3-1

Input Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Input Data Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

General Status Bits (S0 to S4) . . . . . . . . . . . . . . . . . . . . 3-2

Open-Circuit Flag Bits (OC0 to OC4) . . . . . . . . . . . . . . 3-3

Over-Range Flag Bits (O0 to O4) . . . . . . . . . . . . . . . . . 3-3

Under-Range Flag Bits (U0 to U4). . . . . . . . . . . . . . . . . 3-3

Configuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Configuration Data File . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Enabling or Disabling a Channel (Bit 15) . . . . . . . . . . . 3-6

Selecting Data Formats (Bits 14 through 12) . . . . . . . . . 3-6

Selecting Input Type (Bits 11 through 8). . . . . . . . . . . . 3-8

Selecting Temperature Units (Bit 7) . . . . . . . . . . . . . . . 3-9

Determining Open-Circuit Response (Bits 6 and 5) . . . . 3-9

Selecting Input Filter Frequency (Bits 2 through 0) . . . . 3-10

Selecting Enable/Disable Cyclic Calibration

(Word 4, Bit 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Determining Effective Resolution and Range . . . . . . . . . . . 3-14

Determining Module Update Time. . . . . . . . . . . . . . . . . . . 3-33

Effects of Autocalibration on Module Update Time . . . . 3-34

Calculating Module Update Time . . . . . . . . . . . . . . . . . 3-35

Impact of Autocalibration on Module Startup

During Mode Change. . . . . . . . . . . . . . . . . . . . . . . . . . 3-37

Diagnostics and Troubleshooting

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Chapter 4

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Stand Clear of Equipment. . . . . . . . . . . . . . . . . . . . . . . 4-2

Program Alteration. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Specifications

Table of Contents iii

Module Operation vs. Channel Operation . . . . . . . . . . . . . 4-2

Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Invalid Channel Configuration Detection. . . . . . . . . . . . 4-3

Over- or Under-Range Detection . . . . . . . . . . . . . . . . . 4-3

Open-Circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Non-critical vs. Critical Module Errors . . . . . . . . . . . . . . . . 4-4

Module Error Definition Table . . . . . . . . . . . . . . . . . . . . . . 4-4

Module Error Field. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Extended Error Information Field . . . . . . . . . . . . . . . . . 4-5

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Contacting Rockwell Automation . . . . . . . . . . . . . . . . . . . . 4-7

Appendix A

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

Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Repeatability at 25°C (77°F) . . . . . . . . . . . . . . . . . . . . . . . A-3

Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Accuracy Versus Thermocouple Temperature and Filter

Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Two’s Complement Binary Numbers

Thermocouple Descriptions

Using Thermocouple Junctions

Appendix B

Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

Negative Decimal Values. . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Appendix C

International Temperature Scale of 1990. . . . . . . . . . . . . . . C-1

Type B Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

Type E Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

Type J Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Type K Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Type N Thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . C-9

Type R Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-11

Type S Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-12

Type T Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . C-14

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-17

Appendix D

Using a Grounded Junction Thermocouple . . . . . . . . . . . . D-1

Using an Ungrounded (Isolated) Junction Thermocouple . . D-2

Using an Exposed Junction Thermocouple. . . . . . . . . . . . . D-3

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Table of Contents iv

Module Configuration Using MicroLogix 1200 and RSLogix 500

Appendix E

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

1762-IT4 Configuration File . . . . . . . . . . . . . . . . . . . . . E-2

Configuration Using RSLogix 500 Version 5.50 or Higher . . E-2

Generic Extra Data Configuration . . . . . . . . . . . . . . . . . E-6

Configuration Using RSLogix 500 Version 5.2 or Lower. . . . E-7

Glossary

Index

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Preface

Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics:

• who should use this manual

• how to use this manual

• related publications

• conventions used in this manual

• Rockwell Automation support

Who Should Use This Manual

How to Use This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley MicroLogix™ 1200.

As much as possible, we organized this manual to explain, in a task-by-task manner, how to install, configure, program, operate and troubleshoot a control system using the 1762-IT4.

Manual Contents

If you want... See

An overview of the thermocouple/mV input module Chapter 1 Installation and wiring guidelines Chapter 2 Module addressing, configuration and status information Chapter 3 Information on module diagnostics and troubleshooting Chapter 4 Specifications for the input module Appendix A Information on understanding two’s complement binary numbers Appendix B Thermocouple descriptions Appendix C Information on using the different types of thermocouple junctions Appendix D An example of configuration using RSLogix 500 Appendix E

1 Publication 1762-UM002A-EN-P - July 2002

Preface 2

Conventions Used in This Manual

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The following conventions are used throughout this manual:

• Bulleted lists (like this one) provide information not procedural

steps.

• Numbered lists provide sequential steps or hierarchical

information.

• Italic type is used for emphasis.

Preface 3

Rockwell Automation Support

Rockwell Automation offers support services worldwide, with over 75 Sales/Support Offices, 512 authorized distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Rockwell Automation representatives in every major country in the world.

Local Product Support

Contact your local Rockwell Automation representative for:

• sales and order support

• product technical training

• warranty support

• support service agreement

Technical Product Assistance

If you need to contact Rockwell Automation for technical assistance, please review the information in Chapter 4, Diagnostics and Troubleshooting first. Then call your local Rockwell Automation representative.

Your Questions or Comments on the Manual

If you find a problem with this manual, please notify us. If you have any suggestions for how this manual could be made more useful to you, please contact us at the address below:

Rockwell Automation Automation Control and Information Group Technical Communication, Dept. A602V P.O. Box 2086 Milwaukee, WI 53201-2086

Publication 1762-UM002A-EN-P - July 2002

Preface 4

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Chapter

Overview

This chapter describes the 1762-IT4 Thermocouple/mV Input Module and explains how the module reads thermocouple or millivolt analog input data. Included is information about:

• the module’s hardware and diagnostic features

• system and module operation

• calibration

General Description

The thermocouple/mV input module supports thermocouple and millivolt signal measurement. It digitally converts and stores thermocouple and/or millivolt analog data from any combination of up to four thermocouple or millivolt analog sensors. Each input channel is individually configurable via software for a specific input device, data format and filter frequency, and provides open-circuit, over-range and under-range detection and indication.

Thermocouple/mV Inputs and Ranges

The table below defines thermocouple types and their associated full-scale temperature ranges. The second table lists the millivolt analog input signal ranges that each channel will support. To determine the practical temperature range your thermocouple supports, see the specifications in Appendix A.

Thermocouple Type °C Temperature Range °F Temperature Range

J -210 to +1200°C -346 to +2192°F K -270 to +1370°C -454 to +2498°F T -270 to +400°C -454 to +752°F E -270 to +1000°C -454 to +1832°F R 0 to +1768°C +32 to +3214°F S 0 to +1768°C +32 to +3214°F

B +300 to +1820°C +572 to +3308°F N -210 to +1300°C -346 to +2372°F C 0 to +2315°C +32 to + 4199°F

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1-2 Overview

Millivolt Input Type Range

± 50 mV -50 to +50 mV ± 100 mV -100 to +100 mV

Data Formats

The data can be configured on board each module as:

• engineering units x 1

• engineering units x 10

• scaled-for-PID

• percent of full-scale

• raw/proportional data

Filter Frequencies

The module uses a digital filter that provides high frequency noise rejection for the input signals. The filter is programmable, allowing you to select from six different filter frequencies for each channel:

• 10 Hz

• 50 Hz

• 60 Hz

• 250 Hz

• 500 Hz

• 1000 Hz

Hardware Features

Channels are wired as differential inputs. A cold junction compensation (CJC) sensor is attached to the terminal block to enable accurate readings from each channel. The sensor compensates for offset voltages introduced into the input signal as a result of the cold-junction where the thermocouple wires are connected to the module.

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Overview 1-3

The illustration below shows the module’s hardware features.

Item Description

1a upper panel mounting tab 1b lower panel mounting tab 2 power diagnostic LED 3 module door with terminal identification label 5 bus connector cover 6 flat ribbon cable with bus connector (female) 7 terminal block 8 DIN rail latch 9 pull loop

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1-4 Overview

General Diagnostic Features

The module contains a diagnostic LED that helps you identify the source of problems that may occur during power-up or during normal channel operation. The LED indicates both status and power. Power-up and channel diagnostics are explained in Chapter 4,

Diagnostics and Troubleshooting.

System Overview

The modules communicate to the controller through the bus interface. The modules also receive 5 and 24V dc power through the bus interface.

System Operation

At power-up, the module performs a check of its internal circuits, memory, and basic functions. During this time, the module status LED remains off. If no faults are found during power-up diagnostics, the module status LED is turned on.

After power-up checks are complete, the module waits for valid channel configuration data. If an invalid configuration is detected, the module generates a configuration error. Once a channel is properly configured and enabled, it continuously converts the thermocouple or millivolt input to a value within the range selected for that channel.

Each time a channel is read by the input module, that data value is tested by the module for an over-range, under-range, open-circuit, or “input data not valid” condition. If such a condition is detected, a unique bit is set in the channel status word. The channel status word is described in Input Data File on page 3-2.

Publication 1762-UM002A-EN-P - July 2002

Using the module image table, the controller reads the two’s complement binary converted thermocouple or millivolt data from the module. This typically occurs at the end of the program scan or when commanded by the control program. If the controller and the module determine that the data transfer has been made without error, the data is used in the control program.

Overview 1-5

Module Operation

When the module receives a differential input from an analog device, the module’s circuitry multiplexes the input into an A/D converter. The converter reads the signal and converts it as required for the type of input. The module also continuously samples the CJC sensor and compensates for temperature changes at the terminal block cold junction, between the thermocouple wire and the input channel. See the block diagram below.

4 Thermocouple/mV

Inputs

CJC Sensor

A/D

Converter

AIN + AIN -

Multiplexer

Terminal Block

AIN + AIN -

MCU

+15V

+5V

A-GND

-15V

Optocoupler

Supply

Isolated Power

1762 Bus ASIC

MicroLogix 1200 Controller

+24V

S-GND

Each channel can receive input signals from a thermocouple or millivolt analog input device, depending upon how you configured the channel.

When configured for thermocouple input types, the module converts the analog input voltages into cold-junction compensated and linearized digital temperature readings. The module uses the National Institute of Standards and Technology (NIST) ITS-90 standard for linearization for all thermocouple types (J, K, T, E, R, S, B, N, C).

When configured for millivolt inputs, the module converts the analog values directly into digital counts.

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1-6 Overview

Module Field Calibration

The module provides autocalibration, which compensates for offset and gain drift of the A/D converter caused by a temperature change within the module. An internal, high-precision, low drift voltage and system ground reference is used for this purpose. The input module performs autocalibration when a channel is initially enabled. In addition, you can program the module to perform a calibration cycle once every 5 minutes. See Selecting Enable/Disable Cyclic Calibration (Word 4, Bit 0) on page 3-14 for information on configuring the module to perform periodic autocalibration.

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Installation and Wiring

This chapter tells you how to:

• determine the power requirements for the modules

• avoid electrostatic damage

• install the module

• wire the module’s terminal block

• wire input devices

Chapter

Compliance to European Union Directives

This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

The 1762-IT4 module is tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and 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.

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2-2 Installation and Wiring

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 – Equipment Requirements and Tests.

For specific information required by EN61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation, Wiring and Grounding Guidelines for

Noise Immunity, publication 1770-4.1

• Automation Systems Catalog, publication B113

Power Requirements

General Considerations

The module receives power through the bus interface from the +5V dc/+24V dc system power supply. The maximum current drawn by the module is shown in the table below.

Module Current Draw at 5V dc at 24V dc

40 mA 50 mA

1762 I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments (Pollution

degree 2

(1)

) and to circuits not exceeding Over Voltage Category II

(IEC 60664-1).

(3)

(2)

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(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that

occasionally a temporary conductivity caused by condensation shall be expected.

(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level transient

voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.

(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)

designations.

Installation and Wiring 2-3

Hazardous Location Considerations

This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. The following WARNING statement applies to use in hazardous locations.

WARNING

EXPLOSION HAZARD

• Substitution of components may impair suitability

for Class I, Division 2.

• Do no replace components or disconnect

equipment unless power has been switched off or the area is known to be non-hazardous.

• Do not connect or disconnect components unless

power has been switched off or the area is known to be non-hazardous.

• This product must be installed within an

enclosure.

• All wiring must comply with N.E.C. article

501-4(b).

Prevent Electrostatic Discharge

ATTENTION

Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. Follow these guidelines when you handle the module:

• Touch a grounded object to discharge static

potential.

• Wear an approved wrist-strap grounding device.

• Do not touch the bus connector or connector

pins.

• Do not touch circuit components inside the

module.

• If available, use a static-safe work station.

• When not in use, keep the module in its

static-shield box.

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2-4 Installation and Wiring

Remove Power

ATTENTION

Remove power before removing or installing this module. When you remove or install a module with power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

• sending an erroneous signal to your system’s

• causing an explosion in a hazardous

• causing permanent damage to the module’s

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

Selecting a Location

field devices, causing unintended machine motion

environment

circuitry

Reducing Noise

Most applications require installation in an industrial enclosure to reduce the effects of electrical interference. Analog inputs are highly susceptible to electrical noise. Electrical noise coupled to the analog inputs will reduce the performance (accuracy) of the module.

Group your modules to minimize adverse effects from radiated electrical noise and heat. Consider the following conditions when selecting a location for the analog module. Position the module:

• away from sources of electrical noise such as hard-contact

switches, relays, and AC motor drives

• away from modules which generate significant radiated heat.

Refer to the module’s heat dissipation specification.

In addition, route shielded, twisted-pair analog input wiring away from any high voltage I/O wiring.

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Mounting

ATTENTION

Do not remove protective debris strip until after the module and all other equipment near the module is mounted and wiring is complete. Once wiring is complete and the module is free of debris, carefully remove protective debris strip. Failure to remove strip before operating can cause overheating.

Minimum Spacing

Installation and Wiring 2-5

Top

Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow

50.8 mm (2 in.) of space on all sides for adequate ventilation, as shown:

TIP

ATTENTION

1762 expansion I/O may be mounted horizontally only.

During panel or DIN rail mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage when power is applied to the module.

MicroLogix

Side Side

1200

1762 I/O

Bottom

1762 I/O

DIN Rail Mounting

The module can be mounted using the following DIN rails: 35 x 7.5 mm (EN 50 022 - 35 x 7.5) or 35 x 15 mm (EN 50 022 - 35 x 15).

Before mounting the module on a DIN rail, close the DIN rail latch. Press the DIN rail mounting area of the module against the DIN rail. The latch will momentarily open and lock into place.

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2-6 Installation and Wiring

Use DIN rail end anchors (Allen-Bradley part number 1492-EA35 or 1492-EAH35) for environments with vibration or shock concerns.

End Anchor

TIP

For environments with extreme vibration and shock concerns, use the panel mounting method described below, instead of DIN rail mounting.

Panel Mounting

Use the dimensional template shown below to mount the module. The preferred mounting method is to use two M4 or #8 panhead screws per module. M3.5 or #6 panhead screws may also be used, but a washer may be needed to ensure a good ground contact. Mounting screws are required on every module.

For more than 2 modules: (number of modules - 1) x 40.4 mm (1.59 in.)

14.5 (0.57)

40.4 (1.59)

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NOTE: Hole spacing tolerance: ±0.4 mm (0.016 in.).

100 (3.94)

90 (3.54)

MicroLogix 1200

40.4 (1.59)

Expansion I/O

MicroLogix 1200

Expansion I/O

MicroLogix 1200

Expansion I/O

Installation and Wiring 2-7

System Assembly

The expansion I/O module is attached to the controller or another I/O module by means of a ribbon cable after mounting as shown below.

TIP

ATTENTION

Use the pull loop on the connector to disconnect modules. Do not pull on the ribbon cable.

EXPLOSION HAZARD

Field Wiring Connections

• In Class I, Division 2 applications, the bus

connector must be fully seated and the bus connector cover must be snapped in place.

• In Class I, Division 2 applications, all modules

must be mounted in direct contact with each other as shown on page 2-5. If DIN rail mounting is used, an end stop must be installed ahead of the controller and after the last 1762 I/O module.

General

• Power and input wiring must be in accordance with Class 1,

Division 2 wiring methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in accordance with the authority having jurisdiction.

• Channels are isolated from one another by ±10 Vdc maximum.

• If multiple power supplies are used with analog millivolt inputs,

the power supply commons must be connected.

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2-8 Installation and Wiring

Terminal Block

• Do not tamper with or remove the CJC sensor on the terminal

block. Removal of the sensor reduces accuracy.

• For millivolt sensors, use Belden 8761 shielded, twisted-pair

wire (or equivalent) to ensure proper operation and high immunity to electrical noise.

• For a thermocouple, use the shielded, twisted-pair

thermocouple extension lead wires specified by the thermocouple manufacturer. Using the incorrect type of thermocouple extension wire or not following the correct polarity will cause invalid readings.

• To ensures optimum accuracy, limit overall cable impedance by

keeping a cable as short as possible. Locate the module as close to input devices as the application permits.

Grounding

ATTENTION

• This product is intended to be mounted to a well-grounded

mounting surface such as a metal panel. Additional grounding connections from the module’s mounting tabs or DIN rail (if used) are not required unless the mounting surface cannot be grounded.

• Under normal conditions, the drain wire (shield) should be

connected to the metal mounting panel (earth ground). Keep shield connection to earth ground as short as possible.

• Ground the shield drain wire at one end only. The typical

location is as follows.

– For grounded thermocouples or millivolt sensors, this is at the

sensor end.

– For insulated/ungrounded thermocouples, this is at the

module end. Contact your sensor manufacturer for additional details.

The possibility exists that a grounded or exposed thermocouple can become shorted to a potential greater than that of the thermocouple itself. Due to possible shock hazard, take care when wiring grounded or exposed thermocouples. See Appendix D, Using Thermocouple Junctions.

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Installation and Wiring 2-9

• If it is necessary to connect the shield drain wire at the module

end, connect it to earth ground using a panel or DIN rail mounting screw.

• Refer to Industrial Automation Wiring and Grounding

Guidelines, Allen-Bradley publication 1770-4.1, for additional

information.

Noise Prevention

• Route field wiring away from any other wiring and as far as

possible from sources of electrical noise, such as motors, transformers, contactors, and ac devices. As a general rule, allow at least 15.2 cm (6 in.) of separation for every 120V of power.

• Routing field wiring in a grounded conduit can reduce electrical

noise.

• If field wiring must cross ac or power cables, ensure that they

cross at right angles.

Wiring

• To limit the pickup of electrical noise, keep thermocouple and

millivolt signal wires as far as possible from power and load lines.

• If noise persists for a device, try grounding the opposite end of

the cable shield. (You can only ground one end at a time.)

Terminal Block Layout

CJC CJC

IN2 +

IN2 -

IN3 +

IN3 -

IN 0 + IN 0 IN1 + IN1 -

Labeling the Terminals

A write-on label is provided with the module. Mark the identification of each terminal with permanent ink, and slide the label back into the door.

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2-10 Installation and Wiring

Wiring the Finger-Safe Terminal Block

ATTENTION

Be careful when stripping wires. Wire fragments that fall into a module could cause damage when power is applied. Once wiring is complete, ensure the module is free of all metal fragments.

When wiring the terminal block, keep the finger-safe cover in place.

1. Route the wire under the terminal pressure plate. You can use

the stripped end of the wire or a spade lug. The terminals will accept a 6.35 mm (0.25 in.) spade lug.

2. Tighten the terminal screw making sure the pressure plate

secures the wire. Recommended torque when tightening terminal screws is 0.904 Nm (8 in-lbs).

3. After wiring is complete, remove the debris shield.

TIP

If you need to remove the finger-safe cover, insert a screw driver into one of the square wiring holes and gently pry the cover off. If you wire the terminal block with the finger-safe cover removed, you will not be able to put it back on the terminal block because the wires will be in the way.

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Installation and Wiring 2-11

Wire Size and Terminal Screw Torque

Each terminal accepts up to two wires with the following restrictions:

Wire Type Wire Size Terminal Screw Torque

Solid Cu-90°C (194°F) #14 to #22 AWG 0.904 Nm (8 in-lbs) Stranded Cu-90°C (194°F) #16 to #22 AWG 0.904 Nm (8 in-lbs)

Terminal Door Label

A removable, write-on label is provided with the module. Remove the label from the door, mark your unique identification of each terminal with permanent ink, and slide the label back into the door. Your markings (ID tag) will be visible when the module door is closed.

Wiring the Module

ATTENTION

To prevent shock hazard, care should be taken when wiring the module to analog signal sources. Before wiring any module, disconnect power from the system power supply and from any other source to the module.

After the module is properly installed, follow the wiring procedure on page 2-12, using the proper thermocouple extension cable, or Belden 8761 for non-thermocouple applications.

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2-12 Installation and Wiring

cable

signal wire

drain wire

To wire your module follow these steps.

1. At each end of the cable, strip some casing to expose the

individual wires.

2. Trim the signal wires to 2-inch (5 cm) lengths. Strip about 3/16

inch (5 mm) of insulation away to expose the end of the wire.

ATTENTION

Be careful when stripping wires. Wire fragments that fall into a module could cause damage at power up.

foil shield

signal wire

Cut foil shield and drain wire

signal wire

3. At one end of the cable, twist the drain wire and foil shield

together, bend them away from the cable, and apply shrink wrap. Then earth ground at the preferred location based on the type of sensor you are using. See Grounding on page 2-8.

4. At the other end of the cable, cut the drain wire and foil shield

back to the cable and apply shrink wrap.

5. Connect the signal wires to the terminal block. Connect the

other end of the cable to the analog input device.

6. Repeat steps 1 through 5 for each channel on the module.

TIP

See Appendix D Using Thermocouple Junctions for additional information on wiring grounded, ungrounded, and exposed thermocouple types.

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Wiring Diagram

Installation and Wiring 2-13

ungrounded thermocouple

CJC sensor

CJC+

CJC -

IN 2+

IN 2-

IN 3+

IN 3-

TIP

IMPORTANT

IN 0+ IN 0-

IN 1 + IN 1-

grounded thermocouple

within 10V dc

When using an ungrounded thermocouple, the shield must be connected to ground at the module end.

When using grounded and/or exposed thermocouples that are touching electrically conductive material, the ground potential between any two channels cannot exceed ±10V dc, or temperature readings will be inaccurate.

grounded thermocouple

Cold Junction Compensation

To obtain accurate readings from each of the channels, the temperature between the thermocouple wire and the input channel must be compensated for. A cold junction compensating thermistor has been integrated in the terminal block. The thermistor must remain installed to retain accuracy.

ATTENTION

If the thermistor assembly is accidentally removed, re-install it by connecting it across the pair of CJC terminals.

Do not remove or loosen the cold junction compensating thermistor assembly. This assembly is critical to ensure accurate thermocouple input readings at each channel. The module will operate in the thermocouple mode, but at reduced accuracy if the CJC sensor is removed. See Determining Open-Circuit Response (Bits 6 and 5) on page 3-9.

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2-14 Installation and Wiring

Calibration

The thermocouple module is initially calibrated at the factory. The module also has an autocalibration function.

When an autocalibration cycle takes place, the module’s multiplexer is set to system ground potential and an A/D reading is taken. The A/D converter then sets its internal input to the module’s precision voltage source, and another reading is taken. The A/D converter uses these numbers to compensate for system offset (zero) and gain (span) errors.

Autocalibration of a channel occurs whenever a channel is enabled. You can also program your module to perform cyclic calibration cycles, every five minutes. See Selecting Enable/Disable Cyclic Calibration (Word 4, Bit 0) on page 3-14.

To maintain optimal system accuracy, periodically perform an autocalibration cycle.

IMPORTANT

The module does not convert input data while the calibration cycle is in progress following a change in configuration. Module scan times are increased by up to 112 ms during cyclic autocalibration.

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Chapter

Module Data, Status, and Channel Configuration

After installing the 1762-IT4 thermocouple/mV input module, you must configure it for operation using the programming software compatible with the controller (for example, RSLogix 500). Once configuration is complete and reflected in the ladder logic, you need to operate the module and verify its configuration.

This chapter contains information on the following:

• module memory map

• accessing input image file data

• configuring channels

• determining effective resolution and range

• determining module update time

Module Memory Map

slot e

Input Image

File

Accessing Input Image File Data

The module uses six input words for data and status bits (input image), and five configuration words.

Memory Map

Channel 0 Data Word Channel 1 Data Word

Input Image

6 words

The input image file represents data words and status words. Input words 0 through 3 hold the input data that represents the value of the analog inputs for channels 0 through 3. These data words are valid only when the channel is enabled and there are no errors. Input words 4 and 5 hold the status bits. To receive valid status information, the channel must be enabled.

Channel 2 Data Word Channel 3 Data Word

General/Open-Circuit Status Bits

Over-/Under-range Bits

Bit 15 Bit 0

Word 0 Word 1 Word 2 Word 3

Word 4, bits 0 to 4 and 8 to 12 Word 5, bits 6 to 15

You can access the information in the input image file using the programming software data files input screen.

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3-2 Module Data, Status, and Channel Configuration

Input Data File

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

0 SGN Analog Input Data Channel 0 1 SGN Analog Input Data Channel 1 2 SGN Analog Input Data Channel 2 3 SGN Analog Input Data Channel 3 4 Reserved OC4 OC3 OC2 OC1 OC0 Reserved S4 S3 S2 S1 S0 5 U0 O0U1O1U2O2U3O3U4O4 Reserved

The input data table allows you to access module read data for use in the control program, via word and bit access. The data table structure is shown in table below.

Input Data Values

Data words 0 through 3 correspond to channels 0 through 3 and contain the converted analog input data from the input device. The most significant bit, bit 15, is the sign bit (SGN).

General Status Bits (S0 to S4)

Bits S0 through S3 of word 4 contain the general status information for channels 0 through 3, respectively. Bit S4 contains general status information for the CJC sensor. If set (1), these bits indicate an error (over- or under-range, open-circuit or input data not valid condition) associated with that channel. The data not valid condition is described below.

Input Data Not Valid Condition

The general status bits S0 to S3 also indicate whether or not the input data for a particular channel, 0 through 3, is being properly converted (valid) by the module. This “invalid data” condition can occur (bit set) when the download of a new configuration to a channel is accepted by the module (proper configuration) but before the A/D converter can provide valid (properly configured) data to the MicroLogix 1200 controller. The following information highlights the bit operation of the Data Not Valid condition.

1. The default and module power-up bit condition is reset (0).

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2. The bit condition is set (1) when a new configuration is received

and determined valid by the module. The set (1) bit condition

Module Data, Status, and Channel Configuration 3-3

remains until the module begins converting analog data for the previously accepted new configuration. When conversion begins, the bit condition is reset (0). The amount of time it takes for the module to begin the conversion process depends on the number of channels being configured and the amount of configuration data downloaded by the controller.

TIP

3. If A/D hardware errors prevent the conversion process from

taking place, the bit condition is set (1).

If the new configuration is invalid, the bit function remains reset (0) and the module posts a configuration error. See Configuration Errors on page 4-5.

Open-Circuit Flag Bits (OC0 to OC4)

Bits OC0 through OC3 of word 4 contain open-circuit error information for channels 0 through 3, respectively. Errors for the CJC sensor are indicated in OC4. The bit is set (1) when an open-circuit condition exists. See Open-Circuit Detection on page 4-4 for more information on open-circuit operation.

Over-Range Flag Bits (O0 to O4)

Over-range bits for channels 0 through 3 and the CJC sensor are contained in word 5, even-numbered bits. They apply to all input types. When set (1), the over-range flag bit indicates an input signal that is at the maximum of its normal operating range for the represented channel or sensor. The module automatically resets (0) the bit when the data value falls below the maximum for that range.

Under-Range Flag Bits (U0 to U4)

Under-range bits for channels 0 through 3 and the CJC sensor are contained in word 5, odd-numbered bits. They apply to all input types. When set (1), the under-range flag bit indicates an input signal that is at the minimum of its normal operating range for the represented channel or sensor. The module automatically resets (0) the bit when the under-range condition is cleared and the data value is within the normal operating range.

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3-4 Module Data, Status, and Channel Configuration

Configuring Channels

Word

/Bit

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

Enable

Channel

Data Format

Channel 0

After module installation, you must configure operation details, such as thermocouple type, temperature units, etc., for each channel. Channel configuration data for the module is stored in the controller configuration file, which is both readable and writable.

The configuration data file is shown below. Bit definitions are provided in Channel Configuration on page 3-4. Detailed definitions of each of the configuration parameters follow the table.

Configuration Data File

The default value of the configuration data is represented by zeros in the data file. The structure of the channel configuration file is shown below.

Input Type Channel 0

Temperature

Units

Channel 0

Open-Circuit

Condition

Channel 0

Not

Used

Not

Used

Filter Frequency

Channel 0

Enable

Channel

Enable

Channel

Enable

Channel

4 Reserved

Data Format

Channel 1

Data Format

Channel 2

Data Format

Channel 3

Input Type Channel 1

Input Type Channel 2

Input Type Channel 3

Temperature

Units

Channel 1

Temperature

Units

Channel 2

Temperature

Units

Channel 3

The structure and bit settings are shown in Channel Configuration on page 3-4.

Channel Configuration

Each channel configuration word consists of bit fields, the settings of which determine how the channel operates. See the table below and the descriptions that follow for valid configuration settings and their meanings.

Open-Circuit

Condition

Channel 1

Open-Circuit

Condition

Channel 2

Open-Circuit

Condition

Channel 3

Not

Used

Not

Used

Not

Used

Not

Used

Not

Used

Not

Used

Filter Frequency

Channel 1

Filter Frequency

Channel 2

Filter Frequency

Channel 3

Enable/Disable

Cyclic

Calibration

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Module Data, Status, and Channel Configuration 3-5

To Select

Filter Frequency

Open Circuit

Temperature Units

Input Typ e

Data Format

Enable Channel

(1)

10 Hz

60 Hz

50 Hz 250Hz 500 Hz 1 kHz

Upscale

Downscale Hold Last State Zero

Degrees C

Degrees F

Thermocouple J

Thermocouple K Thermocouple T Thermocouple E Thermocouple R Thermocouple S Thermocouple B Thermocouple N Thermocouple C

-50 to +50 mV

-100 to +100 mV

Raw/ Proportional

Engineering Units

Engineering Units X 10

Scaled-for-PID Percent Range Disable 0 Enable 1

Make these bit settings

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

110 6 000 0 001 1 011 3 100 4

101 5 00 0 01 32 10 64 11 96

0 0 1 128

0000 0

0001 256 0010 512

(2)

0011 768 0100 1024

Not Used

0101 1280 0110 1536 0111 1792 1000 2048 1001 2304 1010 2560

000 0

001 4096

100 16384

010 8192 011 12288

Decimal

Value

-32768

(1) Default values are in bold type and are indicated by zero bit settings. For example, the default filter frequency is 60Hz.

(2) An attempt to write any non-valid (spare) bit configuration into any selection field results in a module configuration error.

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3-6 Module Data, Status, and Channel Configuration

Enabling or Disabling a Channel (Bit 15)

You can enable or disable each of the four channels individually using bit 15. The module only scans enabled channels. Enabling a channel forces it to be recalibrated before it measures input data. Disabling a channel sets the channel data word to zero.

TIP

When a channel is not enabled (0), no input is provided to the controller by the A/D converter. This speeds up the response of the active channels, improving performance.

Selecting Data Formats (Bits 14 through 12)

This selection configures channels 0 through 3 to present analog data in any of the following formats:

• Raw/Proportional Data

• Engineering Units x 1

• Engineering Units x 10

• Scaled for PID

• Percent Range

Table 3.1 Channel Data Word Format

Input Ty pe

J -2100 to +12000 -3460 to +21920 -210 to +1200 -346 to +2192 0 to +16383 -32767 to +32767 0 to +10000 K -2700 to +13700 -4540 to +24980 -270 to +1370 -454 to +2498 0 to +16383 -32767 to +32767 0 to +10000 T -2700 to +4000 -4540 to +7520 -270 to +400 -454 to +752 0 to +16383 -32767 to +32767 0 to +10000 E -2700 to +10000 -4540 to +18320 -270 to +1000 -454 to +1832 0 to +16383 -32767 to +32767 0 to +10000 R 0 to +17680 +320 to 32140 0 to +1768 +32 to 3214 0 to +16383 -32767 to +32767 0 to +10000 S 0 to +17680 +320 to 32140 0 to +1768 +32 to 3214 0 to +16383 -32767 to +32767 0 to +10000 B +3000 to 18200

N -2100 to +13000 -3460 to +23720 -210 to +1300 -346 to +2372 0 to +16383 -32767 to +32767 0 to +10000 C 0 to +23150

±50 mV ±100 mV

(1) Type B and C thermocouples cannot be represented in engineering units x1 (°F) above 3276.7 °F; therefore, it will be treated as an over-range error.

(2) When millivolts are selected, the temperature setting is ignored. Analog input date is the same for °C or °F selection.

Engineering Units x1 Engineering Units x10

°C °F °C °F

(1)

+300 to 1820 +572 to 3308 0 to +16383 -32767 to +32767 0 to +10000

(1)

0 to +2315 +32 to 4199 0 to +16383 -32767 to +32767 0 to +10000

-500 to +500

-1000 to 1000

-5000 to +5000

-10000 to 10000

+5720 to 32767

+320 to 32767

(2)

Data Format

(2)

Scaled-for-PID

0 to +16383 -32767 to +32767 0 to +10000 0 to +16383 -32767 to +32767 0 to +10000

Raw/Proportion

al Data

Percent

Range

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Module Data, Status, and Channel Configuration 3-7

TIP

The engineering units data formats represent real engineering temperature units provided by the module to the controller. The raw/proportional counts, scaled-for-PID and percent of full-scale data formats may yield the highest effective resolutions, but may also require that you convert channel data to real engineering units in your control program.

Raw/Proportional Data

The value presented to the controller is proportional to the selected input and scaled into the maximum data range allowed by the bit resolution of the A/D converter and filter selected. The raw/proportional data format also provides the best resolution of all the data formats.

If you select the raw/proportional data format for a channel, the data word will be a number between -32767 and +32767. For example, if a type J thermocouple is selected, the lowest temperature of -210°C corresponds to -32767 counts. The highest temperature of 1200°C corresponds to +32767. See Determining Effective Resolution and Range on page 3-14.

Engineering Units x 1

When using this data format for a thermocouple or millivolt input, the module scales the thermocouple or millivolt input data to the actual engineering values for the selected millivolt input or thermocouple type. It expresses temperatures in 0.1°C or 0.1°F units. For millivolt inputs, the module expresses voltages in 0.01 mV units.

TIP

The resolution of the engineering units x 1 data format is dependent on the range selected and the filter selected. See Determining Effective Resolution and Range on page 3-14.

Use the engineering units x 10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit.

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3-8 Module Data, Status, and Channel Configuration

Engineering Units x 10

When using a thermocouple input with this data format, the module scales the input data to the actual temperature values for the selected thermocouple type. With this format, the module expresses temperatures in 1°C or 1°F units. For millivolt inputs, the module expresses voltages in 0.1 mV units.

The resolution of the engineering units x 10 data format is dependent on the range selected and the filter selected. See Determining Effective Resolution and Range on page 3-14.

Scaled-for-PID

The value presented to the controller is a signed integer with 0 representing the lower input range and +16383 representing the upper input range.

To obtain the value, the module scales the input signal range to a 0 to +16383 range, which is standard to the PID algorithm for the MicroLogix 1200 and other Allen-Bradley controllers (e.g. SLC). For example, if type J thermocouple is used, the lowest temperature for the thermocouple is -210°C, which corresponds to 0 counts. The highest temperature in the input range, 1200°C, corresponds to +16383 counts.

Percent Range

Input data is presented to the user as a percent of the specified range. The module scales the input signal range to a 0 to +10000 range. For example, using a type J thermocouple, the range -210°C to +1200°C is represented as 0% to 100%. See Determining Effective Resolution and Range on page 3-14.

Selecting Input Type (Bits 11 through 8)

Bits 11 through 8 in the channel configuration word indicate the type of thermocouple or millivolt input device. Each channel can be individually configured for any type of input.

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Module Data, Status, and Channel Configuration 3-9

Selecting Temperature Units (Bit 7)

The module supports two different linearized/scaled ranges for thermocouples, degrees Celsius (°C) and degrees Fahrenheit (°F). Bit 7 is ignored for millivolt input types, or when raw/proportional, scaled-for-PID, or percent data formats are used.

IMPORTANT

If you are using engineering units x 1 data format and degrees Fahrenheit temperature units, thermocouple types B and C cannot achieve full-scale temperature with 16-bit signed numerical representation. An over-range error will occur for the configured channel if it tries to represent the full-scale value. The maximum representable temperature is 3276.7°F.

Determining Open-Circuit Response (Bits 6 and 5)

An open-circuit condition occurs when an input device or its extension wire is physically separated or open. This can happen if the wire is cut or disconnected from the terminal block.

TIP

If the CJC sensor is removed from the module terminal block, its open-circuit bit is set (1) and the module continues to calculate thermocouple readings at reduced accuracy. If an open CJC circuit is detected at power-up, the module uses 25°C as the sensed temperature at that location. If an open CJC circuit is detected during normal operation, the last valid CJC reading is used. An input channel configured for millivolt input is not affected by CJC open-circuit conditions. See Open-Circuit Detection on page 4-4 for additional details.

Bits 6 and 5 define the state of the channel data word when an open-circuit condition is detected for the corresponding channel. The module overrides the actual input data depending on the option that you specify when it detects an open circuit. The open-circuit options are explained in the table on page 3-10.

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3-10 Module Data, Status, and Channel Configuration

Table 3.2 Open-Circuit Response Definitions

Response Option

Upscale Sets the input data value to full upper scale value of channel data word. The

Downscale Sets the input data value to full lower scale value of channel data word. The

Last State Sets the input data value to the last input value prior to the detection of the

Zero Sets the input data value to 0 to force the channel data word to 0.

Definition

full-scale value is determined by the selected input type and data format.

low scale value is determined by the selected input type and data format.

open-circuit.

Selecting Input Filter Frequency (Bits 2 through 0)

The input filter selection field allows you to select the filter frequency for each channel and provides system status of the input filter setting for channels 0 through 3. The filter frequency affects the following, as explained later in this chapter:

• noise rejection characteristics for module inputs

• channel step response

• channel cut-off frequency

• effective resolution

• module update time

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Effects of Filter Frequency on Noise Rejection

The filter frequency that you choose for a module channel determines the amount of noise rejection for the inputs. A lower frequency (50 Hz versus 500 Hz) provides better noise rejection and increases effective resolution, but also increases channel update time. A higher filter frequency provides lower noise rejection, but decreases the channel update time and effective resolution.

When selecting a filter frequency, be sure to consider cut-off frequency and channel step response to obtain acceptable noise rejection. Choose a filter frequency so that your fastest-changing signal is below that of the filter’s cut-off frequency.

Module Data, Status, and Channel Configuration 3-11

Common Mode Rejection is better than 115 dB at 50 and 60 Hz, with the 50 and 60 Hz filters selected, respectively, or with the 10Hz filter selected. The module performs well in the presence of common mode noise as long as the signals applied to the user positive and negative input terminals do not exceed the common mode voltage rating (±10V) of the module.

TIP

Improper earth ground may be a source of common mode noise.

Transducer power supply noise, transducer circuit noise, or process variable irregularities may also be sources of normal mode noise.

TIP

The filter frequency of the module’s CJC sensors is the lowest filter frequency of any enabled thermocouple type to maximize the trade-offs between effective resolution and channel update time.

Effects of Filter Frequency on Channel Step Response

The selected channel filter frequency determines the channel’s step response. The step response is the time required for the analog input signal to reach 100% of its expected final value, given a full-scale step change in the input signal. This means that if an input signal changes faster than the channel step response, a portion of that signal will be attenuated by the channel filter. The channel step response is calculated by a settling time of 3 x (1/filter frequency).

Filter Frequency Step Response

10 Hz 303 ms 50 Hz 63 ms

60 Hz 53 ms 250 Hz 15 ms 500 Hz 9 ms

1 kHz 7 ms

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3-12 Module Data, Status, and Channel Configuration

Channel Cut-Off Frequency

The filter cut-off frequency, -3 dB, is the point on the frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. The following table shows cut-off frequencies for the supported filters.

Table 3.3 Filter Frequency versus Channel Cut-off Frequency

Filter Frequency Cut-off Frequency

10 Hz 2.62 Hz

50 Hz 13.1 Hz

60 Hz 15.7 Hz 250 Hz 65.5 Hz 500 Hz 131 Hz

1 kHz 262 Hz

All input frequency components at or below the cut-off frequency are passed by the digital filter with less than 3 dB of attenuation. All frequency components above the cut-off frequency are increasingly attenuated as shown in the graphs on page 3-13.

Publication 1762-UM002A-EN-P - July 2002

Module Data, Status, and Channel Configuration 3-13

Figure 3.1 Frequency Response Graphs

0 –20 –40 –60

–80

-100

-120

Gain (dB)

-140

-160

-180

- 200 0

2.62 Hz

10 Hz Input Filter Frequency 50 Hz Input Filter Frequency

Gain (dB)

- 200

-100

-120

-140

-160

-180

–20 –40 –60

–80

13. 1 Hz

–3 dB

100

150

–3 dB

Frequency (Hz) Frequency (Hz)

300

250

200

60 Hz Input Filter Frequency

1 5.72 Hz

131 Hz

–3 dB

180

120

Frequency (Hz)

500 Hz Input Filter Frequency

–3 dB

240

2000

300

360

30000 250015001000500

–20 –40 –60

–80

-100

-120

Gain (dB)

-140

-160

-180

- 200

–20 –40 –60

–80

-100

-120

Gain (dB)

-140

-160

-180

- 200

Frequency (Hz)

Gain (dB)

- 200

Gain (dB)

–20 –40 –60

–80

-100

-120

-140

-160

-180

- 200

65 .5 Hz

0 –20 –40 –60

–80

-100

-120

-140

-160

-180

262 Hz

250 Hz Input Filter Frequency

–3 dB

Frequency (Hz)

1000 Hz Input Filter Frequency

–3 dB

Frequency (Hz)

900

1300

1150750500250

5K3K2K1K

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3-14 Module Data, Status, and Channel Configuration

The cut-off frequency for each channel is defined by its filter frequency selection. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with the update time. The cut-off frequency relates to how the digital filter attenuates frequency components of the input signal. The update time defines the rate at which an input channel is scanned and its channel data word is updated.

Selecting Enable/Disable Cyclic Calibration (Word 4, Bit 0)

Cyclic calibration functions to reduce offset and gain drift errors due to temperature changes within the module. By setting word 4, bit 0 to 0, you can configure the module to perform calibration on all enabled channels. Setting this bit to 1 disables cyclic calibration.

You can program the calibration cycle to occur whenever you desire for systems that allow modifications to the state of this bit via the ladder program. When the calibration function is enabled (bit = 0), a calibration cycle occurs once for all enabled channels. If the function remains enabled, a calibration cycle occurs every five minutes thereafter. The calibration cycle of each enabled channel is staggered over several module scan cycles within the five minute period to limit impact on the system response speed.

Determining Effective Resolution and Range

See Effects of Autocalibration on Module Update Time on page 3-34.

The effective resolution for an input channel depends upon the filter frequency selected for that channel. The following graphs provide the effective resolution for each of the range selections at the six available frequencies. These graphs do not include the affects of unfiltered input noise. Choose the frequency that most closely matches your requirements.

Publication 1762-UM002A-EN-P - July 2002

2.5

2.0

Module Data, Status, and Channel Configuration 3-15

Figure 3.2 Effective Resolution Versus Input Filter Selection for Type B Thermocouples Using 10, 50, and 60 Hz Filters

1.5

10 Hz 50 Hz

1.0

Effective Resolution (°C)

0.5

60 Hz

0.0 200 400 600 800 1000 1200 1400 1600 1800 2000

Temperature (°C)

4.5

4.0

3.5

3.0

2.5

2.0

10 Hz 50 Hz 60 Hz

1.5

Effective Resolution (°F)

1.0

0.5

0.0 500 1000 1500 2000 2500 3000 3500

Temperature (°F)

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3-16 Module Data, Status, and Channel Configuration

Figure 3.3 Effective Resolution Versus Input Filter Selection for Type B Thermocouples Using 250, 500, and 1k Hz Filte

350 300 250 200 150 100

Effective Resolution (°C)

200 400 600 800 1000 1200 1400 1600 1800 2000

250 Hz 500 Hz 1000Hz

Temperature (°C)

600

500

400

300

200

Effective Resolution (°F)

250 Hz 500 Hz 1000 Hz

100

500 1000 1500 2000 2500 3000 3500

Temperature (°F)

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Module Data, Status, and Channel Configuration 3-17

Figure 3.4 Effective Resolution Versus Input Filter Selection for Type C Thermocouples Using 10, 50, and 60 Hz Filters

0. 8

0. 7

0. 6

0. 5

0. 4

0. 3

Effective Resolution (°C)

0. 2

10 Hz 50 Hz 60 Hz

0. 1

0. 0 0 400 800 1200 1600 2000 2400

Temperature (°C)

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Effective Resolution (°F)

0.2

0.0 0 500 1000 1500 2000 2500 3000 3500 4000 4500

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-18 Module Data, Status, and Channel Configuration

Figure 3.5 Effective Resolution Versus Input Filter Selection for Type C Thermocouples Using 250, 500, and 1k Hz Filters

180 160 140 120 100

80 60

Effective Resolution (°C)

40 20

0 400 800 1200 1600 2000 2400

250 Hz 500 Hz 1000 Hz

Temperature (°C)

350 300 250

250 Hz

200

500 Hz

150 100

Effective Resolution (°F)

1000 Hz

0 500 1000 1500 2000 2500 3000 3500 4000 4500

Temperature (°F)

Publication 1762-UM002A-EN-P - July 2002

3.0

2.5

Module Data, Status, and Channel Configuration 3-19

Figure 3.6 Effective Resolution Versus Input Filter Selection for Type E Thermocouples Using 10, 50, and 60 Hz Filters

2.0

1.5

1.0

Effective Resolution (°C)

0.5

0.0

-400 -200 0 200 400 600 800 1000

Temperature (°C)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

Effective Resolution (°F)

1.0

0.5

0.0

-500 0 500 1000 1500 2000

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-20 Module Data, Status, and Channel Configuration

Figure 3.7 Effective Resolution Versus Input Filter Selection for Type E Thermocouples Using 250, 500, and 1k Hz Filters

100

Effective Resolution (°C)

-400 -200 0 200 400 600 800 1000

Temperature (°C)

160 140 120 100

80 60 40

Effective Resolution (°F)

250 Hz 500 Hz 1000 Hz

-500 0 500 1000 1500 2000

Publication 1762-UM002A-EN-P - July 2002

Temperature (°F)

Module Data, Status, and Channel Configuration 3-21

Figure 3.8 Effective Resolution Versus Input Filter Selection for Type J Thermocouples Using 10, 50, and 60 Hz Filters

0.4

0.3

0.2

0.1

Effective Resolution (°C)

-400 -200 0 200 400 600 800 1000 1200

Temperature (°C)

10 Hz 50 Hz 60 Hz

0.7

0.6

0.5

0.4

0.3

0.2

Effective Resolution (°F)

0.1 0

-400 0 400 800 1200 1600 2000

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-22 Module Data, Status, and Channel Configuration

Figure 3.9 Effective Resolution Versus Input Filter Selection for Type J Thermocouples Using 250, 500, and 1k Hz Filters

Effective Resolution (°C)

-400 -200 0 200 400 600 800 1000 1200

Temperature (°C)

120

100

Effective Resolution (°F)

250 Hz 500 Hz 1000 Hz

-400 0 400 800 1200 1600 2000

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Temperature (°F)

Module Data, Status, and Channel Configuration 3-23

Figure 3.10 Effective Resolution Versus Input Filter Selection for Type K Thermocouples Using 10, 50, and 60 Hz Filters

5. 5

5. 0

4. 5

4. 0

3. 5

3. 0

2. 5

2. 0

1. 5

Effective Resolution (°C)

1. 0

0. 5

0. 0

-400 -200 0 200 400 600 800 1000 1200

Temperature (°C)

10 Hz 50 Hz 60 Hz

10. 0

9.0

8.0

7.0

6.0

5.0

4.0

3.0

Effective Resolution (°F)

2.0

1.0

0.0

-500 0 500 1000 1500 2000 2500

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-24 Module Data, Status, and Channel Configuration

Figure 3.11 Effective Resolution Versus Input Filter Selection for Type K Thermocouples Using 250, 500, and 1k Hz Filters

120

100

Effective Resolution (°C)

-400 -200 0 200 400 600 800 1000 1200

Temperature (°C)

220 200 180 160 140 120 100

80 60

Effective Resolution (°F)

40 20

-500 0 500 1000 1500 2000 2500

Temperature (°F)

250Hz 500Hz 1000 Hz

250 Hz 500 Hz 1000 Hz

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Module Data, Status, and Channel Configuration 3-25

Figure 3.12 Effective Resolution Versus Input Filter Selection for Type N Thermocouples Using 10, 50, and 60 Hz Filters

0.8

0.7

0.6

0.5

0.4

0.3

0.2

Effective Resolution (°C)

0.1

0.0

-400 -200 0 200 400 600 800 1000 1200 1400

Temperature (°C)

10 Hz 50 Hz 60 Hz

1.4

1.2

1.0

0.8

0.6

0.4

Effective Resolution (°F)

0.2

0.0

-500 0 500 1000 1500 2000 2400

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-26 Module Data, Status, and Channel Configuration

Figure 3.13 Effective Resolution Versus Input Filter Selection for Type N Thermocouples Using 250, 500, and 1k Hz Filters

120

100

Effective Resolution (°C)

-400 -200 0 200 400 600 800 1000 1200 1400

Temperature (°C)

200 180 160 140 120 100

80 60

Effective Resolution (°F)

40 20

-500 0 500 1000 1500 2000 2500

Temperature (°F)

250Hz 500Hz 1000 Hz

250 Hz 500 Hz 1000Hz

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1.4

1.2

Module Data, Status, and Channel Configuration 3-27

Figure 3.14 Effective Resolution Versus Input Filter Selection for Type R Thermocouples Using 10, 50, and 60 Hz Filters

1.0

0.8

0.6

0.4

Effective Resolution (°C)

10 Hz 50 Hz 60 Hz

0.2

0.0 0 200 400 600 800 1000 1200 1400 1600 1800

Temperature (°C)

2.5

2.0

1.5

10 Hz 50 Hz

1.0

Effective Resolution (°F)

0.5

60 Hz

0.0 0 500 1000 1500 2000 2500 3000 3500

Temperature (°F)

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3-28 Module Data, Status, and Channel Configuration

Figure 3.15 Effective Resolution Versus Input Filter Selection for Type R Thermocouples Using 250, 500, and 1k Hz Filters

250

200

Effective Resolution (°F)

Effective Resolution (°C)

400 350 300 250 200 150 100

150

100

0 200 400 600 800 1000 1200 1400 1600 1800

Temperature (°C)

250 Hz 500 Hz 1000Hz

250 Hz 500 Hz 1000 Hz

0 500 1000 1500 2000 2500 3000 3500

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Temperature (°F)

Module Data, Status, and Channel Configuration 3-29

Figure 3.16 Effective Resolution Versus Input Filter Selection for Type S Thermocouples Using 10, 50, and 60 Hz Filters

1.4

1.2

1.0 10 Hz

0.8

0.6

0.4

Effective Resolution (°C)

50 Hz 60 Hz

0.2

0.0

0 200 400 600 800 1000 1200 1400 1600 1800

Temperature (°C)

2.5

2.0

1.5

10 Hz 50 Hz

1.0

Effective Resolution (°F)

0.5

60 Hz

0.0 0 500 1000 1500 2000 2500 3000 3500

Temperature (°F)

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3-30 Module Data, Status, and Channel Configuration

Figure 3.17 Effective Resolution Versus Input Filter Selection for Type S Thermocouples Using 250, 500, and 1k Hz Filters

250

200

150

250 Hz 500 Hz

100

Effective Resolution (°C)

1000Hz

0 200 400 600 800 1000 1200 1400 1600 1800

Temperature (°C)

400 350 300 250 200 150

Effective Resolution (°F)

100

250 Hz 500 Hz 1000 Hz

0 500 1000 1500 2000 2500 3000 3500

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Temperature (°F)

Module Data, Status, and Channel Configuration 3-31

Figure 3.18 Effective Resolution Versus Input Filter Selection for Type T Thermocouples Using 10, 50, and 60 Hz Filters

4.0

3.5

3.0

2.5

2.0

1.5

1.0

Effective Resolution (°C)

0.5

0.0

-300 -200 -100 0 100 200 300 400

Temperature (°C)

10 Hz 50 Hz 60 Hz

7.0

6.0

5.0

4.0

3.0

2.0

Effective Resolution (°F)

1.0

0.0

-600 -400 -200 0 200 400 600 800

Temperature (°F)

10 Hz 50 Hz 60 Hz

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3-32 Module Data, Status, and Channel Configuration

Figure 3.19 Effective Resolution Versus Input Filter Selection for Type T Thermocouples Using 250, 500, and 1k Hz Filters

120

100

Effective Resolution (°C)

-300 -200 -100 0 100 200 300 400

Temperature (°C)

220 200 180 160 140 120 100

80 60

Effective Resolution (°F)

40 20

-600 -400 -200 0 200 400 600 800

Temperature (°F)

250 Hz 500 Hz 1000 Hz

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Module Data, Status, and Channel Configuration 3-33

Table 3.4 Effective Resolution vs. Input Filter Selection for Millivolt Inputs

Filter Frequency ±50mV ±100mV

10 Hz 6 µV6 µV 50 Hz 9 µV 12 µV 60 Hz 9 µV 12 µV 250 Hz 125 µV 150 µV 500 Hz 250 µV 300 µV 1 kHz 1000 µV 1300 µV

Determining Module Update Time

TIP

The resolutions provided by the filters apply to the raw/proportional data format only.

The module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and provide the resulting data values to the processor. Module update time can be calculated by adding the sum of all enabled channel’s times. The module sequentially samples the enabled channels in a continuous loop as shown below.

Channel 0 Disabled Channel 1 Disabled Channel 2 Disabled

Sample

Enabled Enabled Enabled

Channel 0

Channel 3 Disabled

Sample

Channel 1

No Thermocouple Calibration Not Active

Sample

Channel 2

Sample

Enabled TC Enabled

Channel 3

Sample

CJC

Perform

Calibration

Active

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Calibration

3-34 Module Data, Status, and Channel Configuration

Channel update time is dependent upon the input filter selection. The following table shows the channel update times.

Table 3.5 Channel Update Time

The CJC input is only sampled if one or more channels are enabled for any thermocouple type. The CJC update time is equal to the largest channel update time of any of the enabled thermocouple inputs types. In that case, a single CJC update is done per scan. See the scan diagram on the previous page. The cyclic calibration time only applies when cyclic calibration is enabled and active. If enabled, the cyclic calibration is staggered over several scan cycles once every five minutes to limit the overall impact to module update time.

Filter Frequency Channel Update Time

10 Hz 303 ms 50 Hz 63 ms

60 Hz 53 ms 250 Hz 15 ms 500 Hz 9 ms

1 kHz 7 ms

Effects of Autocalibration on Module Update Time

The module’s autocalibration feature allows it to correct for accuracy errors caused by temperature drift over the module operating temperature range (0 to 55°C). Autocalibration occurs automatically on a system mode change from Program-to-Run for all configured

channels or if any online channel. In addition, you can configure the module to perform autocalibration every 5 minutes during normal operation, or you can disable this feature using the Enable/Disable Cyclic Calibration function (default is enabled). This feature allows you to implement a calibration cycle anytime, at your command, by enabling and then disabling this bit.

If you enable the cyclic autocalibration function, the module update time increases when the autocalibration occurs. To limit its impact on the module update time, the autocalibration function is divided over multiple module scans. The first enabled channel receives an A/D converter (ADC) self-calibration and a channel offset calibration over the course of two module scans. The time added to the module update time depends on the filter selected for the channel, as shown in Table 3.6 on page 3-35. Each additional enabled channel receives

(1)

configuration change is made to a

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(1) During an online configuration change, input data for the affected channel is not updated by the module.

Module Data, Status, and Channel Configuration 3-35

separate ADC self-calibration and offset calibration cycles only if their filter configurations are different than those of previously calibrated channels.

Following all input channel calibration cycles, the CJC sensor channel receives a separate ADC self-calibration cycle. The time added to this cycle is determined by the filter setting for the CJC, which is set to the lowest filter setting of any input configured as a thermocouple. If no enabled input channel is configured for a thermocouple, no CJC calibration cycle occurs. See Table 3.6 below for channel and CJC sensor ADC self-calibration times as well as channel offset calibration times.

Table 3.6 Calibration Time

Type of Calibration 10 Hz 50 Hz 60 Hz 250 Hz 500 Hz 1 kHz

ADC self-calibration (Channels 0 through 3)

603 123 103 27 15 9

Offset calibration (Channels 0 through 3)

ADC self-calibration (CJC sensor)

303 63 53 15 9 6

603 123 103 27 15 9

Calculating Module Update Time

To determine the module update time, add the individual channel update times for each enabled channel and the CJC update time if any of the channels are enabled as thermocouple inputs.

EXAMPLE

1. Two Channels Enabled for Millivolt Inputs

Channel 0 Input: ±50 mV with 60 Hz filter Channel 1 Input: ±50 mV with 500 Hz filter

From Table 3.5, Channel Update Time, on page 3-34:

Module Update Time

= Ch 0 Update Time + Ch 1 Update Time = 53 ms + 9 ms = 62 ms

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3-36 Module Data, Status, and Channel Configuration

EXAMPLE

2.Three Channels Enabled for Different Inputs

Channel 0 Input: Type J Thermocouple with 10 Hz filter Channel 1 Input: Type J Thermocouple with 60 Hz filter Channel 2 Input: ±100 mV with 250 Hz filter

From Table 3.5, Channel Update Time, on page 3-34:

Module Update Time

= Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time (uses lowest thermocouple filter selected) = 303 ms + 53 ms + 15 ms + 303 ms = 674 ms

3.Three Channels Enabled for Different Inputs with Cyclic Calibration Enabled

Channel 0 Input: Type T Thermocouple with 60 Hz Filter Channel 1 Input: Type T Thermocouple with 60 Hz Filter Channel 2 Input: Type J Thermocouple with 60 Hz Filter

From Table 3.5, Channel Update Time, on page 3-34:

Module Update Time without an Autocalibration Cycle

= Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time (uses lowest thermocouple filter selected) = 53 ms + 53 ms + 53 ms + 53 ms = 212 ms

Module Update Time during an Autocalibration Cycle

Module Scan 1

= Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time + Ch 0 ADC Self-Calibration Time = 53 ms + 53 ms + 53 ms + 53 ms + 103 ms = 315 ms

Module Scan 2

= Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time + Ch 0 Offset Time = 53 ms + 53 ms + 53 ms + 53 ms + 53 ms = 265 ms

Channel 1 and Channel 2: (no scan impact)

No autocalibration cycle is required for Channels 1 and 2 because they are configured to use the same Input Filter as Channel 0.

Module Scan 3

= Ch 0 Update Time + Ch 1 Update Time + Ch 2 Update Time + CJC Update Time + CJC ADC Self-Calibration Time = 53 ms + 53 ms + 53 ms + 53 ms + 103 ms = 315 ms

After the above cycles are complete, the module returns to scans without autocalibration for approximately 5 minutes. At that time, the autocalibration cycle repeats.

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Module Data, Status, and Channel Configuration 3-37

Impact of Autocalibration on Module Startup During Mode Change

Regardless of the selection of the Enable/Disable Cyclic Calibration function, an autocalibration cycle occurs automatically on a mode change from Program-to-Run and on subsequent module startups/initialization for all configured channels. During module startup, input data is not updated by the module and the General Status bits (S0 to S5) are set to 1, indicating a Data Not Valid condition. The amount of time it takes the module to startup is dependent on channel filter frequency selections as indicated in Table 3.5, Channel Update Time, on page 3-34. The following is an example calculation of module startup time.

EXAMPLE

1.Two Channels Enabled for Different Inputs

Channel 0 Input: Type T Thermocouple with 60 Hz filter Channel 1 Input: Type J Thermocouple with 60 Hz filter

Module Startup Time

= Ch 0ADC Self-Calibration Time + Ch 0 Offset Time + CJC Self-Calibration Time = 103 ms + 53 ms + 103 ms = 259 ms

2.Three Channels Enabled; Two with Different Inputs

Channel 0 Input:

Channel 1 Input: Type J Thermocouple with 60 Hz filter Channel 2 Input: T

Module Startup Time

= Channel 0 ADC Self-Calibration Time + Channel 0 Offset Time + Channel 2 ADC Self-Calibration Time + Channel 2 Offset Time + CJC Self-Calibration Time = 103 ms + 53 ms + 123 ms + 63 ms + 103 ms = 445 ms

Type T Thermocouple with 60 Hz filter

ype K Thermocouple with 50 Hz filter

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3-38 Module Data, Status, and Channel Configuration

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Chapter

Diagnostics and Troubleshooting

This chapter describes troubleshooting the thermocouple/mV input module. This chapter contains information on:

• safety considerations while troubleshooting

• internal diagnostics during module operation

• module errors

• contacting Rockwell Automation for technical assistance

Safety Considerations

Safety considerations are an important element of proper troubleshooting procedures. Actively thinking about the safety of yourself and others, as well as the condition of your equipment, is of primary importance.

The following sections describe several safety concerns you should be aware of when troubleshooting your control system.

ATTENTION

Never reach into a machine to actuate a switch because unexpected motion can occur and cause injury.

Remove all electrical power at the main power disconnect switches before checking electrical connections or inputs/outputs causing machine motion.

Indicator Lights

When the green LED on the module is illuminated, it indicates that power is applied to the module and that it has passed its internal tests.

1 Publication 1762-UM002A-EN-P - July 2002

4-2 Diagnostics and Troubleshooting

Stand Clear of Equipment

When troubleshooting any system problem, have all personnel remain clear of the equipment. The problem could be intermittent, and sudden unexpected machine motion could occur. Have someone ready to operate an emergency stop switch in case it becomes necessary to shut off power.

Program Alteration

There are several possible causes of alteration to the user program, including extreme environmental conditions, Electromagnetic Interference (EMI), improper grounding, improper wiring connections, and unauthorized tampering. If you suspect a program has been altered, check it against a previously saved master program.

Module Operation vs. Channel Operation

Safety Circuits

Circuits installed on the machine for safety reasons, like over-travel limit switches, stop push buttons, and interlocks, should always be hard-wired to the master control relay. These devices must be wired in series so that when any one device opens, the master control relay is de-energized, thereby removing power to the machine. Never alter these circuits to defeat their function. Serious injury or machine damage could result.

The module performs diagnostic operations at both the module level and the channel level. Module-level operations include functions such as power-up, configuration, and communication with a MicroLogix 1200 controller.

Channel-level operations describe channel related functions, such as data conversion and over- or under-range detection.

Internal diagnostics are performed at both levels of operation. When detected, module error conditions are immediately indicated by the module status LED. Both module hardware and channel configuration error conditions are reported to the controller. Channel over-range or under-range and open-circuit conditions are reported in the module’s input data table. Module hardware errors are typically reported in the controller’s I/O status file. Refer to your controller manual for details.

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Diagnostics and Troubleshooting 4-3

Power-up Diagnostics

Channel Diagnostics

At module power-up, a series of internal diagnostic tests are performed. If these diagnostic tests are not successfully completed, the module status LED remains off and a module error is reported to the controller.

If module status LED is:

On Proper Operation No action required.

Off Module Fault Cycle power. If condition persists, replace the

When an input channel is enabled, the module performs a diagnostic check to see that the channel has been properly configured. In addition, the channel is tested on every scan for configuration errors, over-range and under-range, and open-circuit conditions.

Indicated condition:

Corrective action:

module. Call your local distributor or Rockwell Automation for assistance.

Invalid Channel Configuration Detection

Whenever a channel configuration word is improperly defined, the module reports an error. See pages 4-4 to 4-6 for a description of module errors.

Over- or Under-Range Detection

Whenever the data received at the channel word is out of the defined operating range, an over-range or under-range error is indicated in input data word 5.

Possible causes of an out-of-range condition include:

• The temperature is too hot or too cold for the type of

thermocouple being used.

• The wrong thermocouple is being used for the input type

selected, or for the configuration that was programmed.

• The input device is faulty.

• The signal input from the input device is beyond the scaling

range.

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4-4 Diagnostics and Troubleshooting

Open-Circuit Detection

On each scan, the module performs an open-circuit test on all enabled channels. Whenever an open-circuit condition occurs, the open-circuit bit for that channel is set in input data word 6.

Possible causes of an open circuit include:

• the input device is broken

• a wire is loose or cut

• the input device is not installed on the configured channel

• A thermocouple is installed incorrectly

Non-critical vs. Critical Module Errors

Module Error Definition Table

Table 4.1 Module Error Table

“Don’t Care” Bits Module Error Extended Error Information

1514131211109876543210

0000000000000000

Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1

Non-critical module errors are typically recoverable. Channel errors (over-range or under-range errors) are non-critical. Non-critical error conditions are indicated in the module input data table.

Critical module errors are conditions that may prevent normal or recoverable operation of the system. When these types of errors occur, the system typically leaves the run or program mode of operation until the error can be dealt with. Critical module errors are indicated in Table 4.3 Extended Error Codes on page 4-6.

Analog module errors are expressed in two fields as four-digit Hex format with the most significant digit as “don’t care” and irrelevant. The two fields are “Module Error” and “Extended Error Information”. The structure of the module error data is shown below.

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Module Error Field

The purpose of the module error field is to classify module errors into three distinct groups, as described in the table below. The type of error determines what kind of information exists in the extended error information field. These types of module errors are typically reported

Diagnostics and Troubleshooting 4-5

in the controller’s I/O status file. Refer to your controller manual for details.

Table 4.2 Module Error Types

Error Type Module Error

Field Value

Bits 11 through 9

(binary)

No Errors 000 No error is present. The extended error field

Hardware Errors

Configuration Errors

001 General and specific hardware error codes are

010 Module-specific error codes are indicated in the

Description

holds no additional information.

specified in the extended error information field.

extended error field. These error codes correspond to options that you can change directly. For example, the input range or input filter selection.

Extended Error Information Field

Check the extended error information field when a non-zero value is present in the module error field. Depending upon the value in the module error field, the extended error information field can contain error codes that are module-specific or common to all 1769 analog modules.

TIP

If no errors are present in the module error field, the extended error information field is set to zero.

Hardware Errors

General or module-specific hardware errors are indicated by module error code 001. See Table 4.3 Extended Error Codes on page 4-6.

Configuration Errors

If you set the fields in the configuration file to invalid or unsupported values, the module generates a critical error.

Table 4.3 Extended Error Codes on page 4-6 lists the possible module-specific configuration error codes defined for the modules.

Publication 1762-UM002A-EN-P - July 2002

4-6 Diagnostics and Troubleshooting

Error Codes

Table 4.3 Extended Error Codes

Error Type Hex

Equivalent

No Error X000 000 0 0000 0000 No Error General Common

Hardware Error

Hardware-Specific Error

Module-Specific Configuration Error

(1)

X200 001 0 0000 0000 General hardware error; no additional information X201 001 0 0000 0001 Power-up reset state X300 001 1 0000 0000 General hardware error; no additional information X301 001 1 0000 0001 Microprocessor hardware error X302 001 1 0000 0010 A/D Converter error X303 001 1 0000 0011 Calibration error X400 010 0 0000 0000 General configuration error; no additional information X401 010 0 0000 0001 Invalid input type selected (channel 0) X402 010 0 0000 0010 Invalid input type selected (channel 1) X403 010 0 0000 0011 Invalid input type selected (channel 2) X404 010 0 0000 0100 Invalid input type selected (channel 3)

The table below explains the extended error code.

Module

Error Code

Binary Binary

Extended Error

Information

Code

Error Description

X405 010 0 0000 0101 Invalid filter selected (channel 0) X406 010 0 0000 0110 Invalid filter selected (channel 1) X407 010 0 0000 0111 Invalid filter selected (channel 2) X408 010 0 0000 1000 Invalid filter selected (channel 3) X409 010 0 0000 1001 Invalid format selected (channel 0) X40A 010 0 0000 1010 Invalid format selected (channel 1) X40B 010 0 0000 1011 Invalid format selected (channel 2) X40C 010 0 0000 1100 Invalid format selected (channel 3) X40D 010 0 0000 1101 An unused bit has been set for channel 0 X40E 010 0 0000 1110 An unused bit has been set for channel 1 X40F 010 0 0000 1111 An unused bit has been set for channel 2 X410 010 0 0001 0000 An unused bit has been set for channel 3 X411 010 0 0001 0001 Invalid module configuration register

(1) X represents the “Don’t Care” digit.

Publication 1762-UM002A-EN-P - July 2002

Diagnostics and Troubleshooting 4-7

Contacting Rockwell Automation

If you need to contact Rockwell Automation for assistance, please have the following information available when you call:

• a clear statement of the problem, including a description of what

the system is actually doing. Note the LED state; also note data and configuration words for the module.

• a list of remedies you have already tried

• processor type and firmware number (See the label on the

processor.)

• hardware types in the system, including all I/O modules

• fault code if the processor is faulted

Publication 1762-UM002A-EN-P - July 2002

4-8 Diagnostics and Troubleshooting

Publication 1762-UM002A-EN-P - July 2002

General Specifications

Appendix

Specifications

Specification Value

Dimensions 90 mm (height) x 87 mm (depth) x 40 mm (width)

height including mounting tabs is 110 mm

3.54 in. (height) x 3.43 in. (depth) x 1.58 in. (width) height including mounting tabs is 4.33 in.

Approximate Shipping Weight (with carton)

Storage Temperature -40°C to +85°C (-40°F to +185°F) Operating Temperature 0°C to +55°C (32°F to +131°F) Operating Humidity 5% to 95% non-condensing Operating Altitude 2000 meters (6561 feet) Vibration Operating: 10 to 500 Hz, 5G, 0.030 in. peak-to-peak

Shock Operating: 30G, 11 ms panel mounted

Recommended Cable Belden™ 8761 (shielded) for millivolt inputs

Agency Certification • C-UL certified (under CSA C22.2 No. 142)

Hazardous Environment Class Class I, Division 2, Hazardous Location, Groups A,

Radiated and Conducted Emissions EN50081-2 Class A

220g (0.53 lbs.)

Relay Operation: 2G

(20G, 11 ms DIN rail mounted) Relay Operation: 7.5G panel mounted (5G DIN rail mounted) Non-Operating: 40G panel mounted (30G DIN rail mounted)

Shielded thermocouple extension wire for the specific type of thermocouple you are using. Follow thermocouple manufacturer’s recommendations.

• UL 508 listed

• CE compliant for all applicable directives

• C-Tick marked for all applicable acts

B, C, D (UL 1604, C-UL under CSA C22.2 No. 213)

1 Publication 1762-UM002A-EN-P - July 2002

A-2 Specifications

Specification Value

Electrical /EMC: The module has passed testing at the following

levels:

• ESD Immunity

• 4 kV contact, 8 kV air, 4 kV indirect

(EN61000-4-2)

• Radiated Immunity

(EN61000-4-3)

• Fast Transient Burst

• 10 V/m , 80 to 1000 MHz, 80% amplitude

modulation, +900 MHz keyed carrier

• 2 kV, 5kHz

(EN61000-4-4)

• Surge Immunity

• 1kV galvanic gun

(EN61000-4-5)

• Conducted Immunity

• 10V, 0.15 to 80MHz

(1) (2)

(EN61000-4-6)

(1) Conducted Immunity frequency range may be 150 kHz to 30 MHz if the Radiated Immunity frequency range is 30

to 1000 MHz.

(2) For grounded thermocouples, the 10V level is reduced to 3V.

Input Specifications

Specification Value

Number of Inputs 4 input channels plus 1 CJC sensor Resolution 15 bits plus sign Bus Current Draw (max.) 40 mA at 5V dc

50 mA at 24V dc

Heat Dissipation 1.5 Total Watts (The Watts per point, plus the minimum

Watts, with all points energized.) Converter Type Delta Sigma Response Speed per Channel Input filter and configuration dependent. See “Effects of

Filter Frequency on Noise Rejection” on page 3-10 Rated Working Voltage

(1)

Common Mode Voltage Range

30V ac/30V dc

(2)

±10V maximum per channel Common Mode Rejection 115 dB (minimum) at 50 Hz (with 10 Hz or 50 Hz filter)

115 dB (minimum) at 60 Hz (with 10 Hz or 60 Hz filter) Normal Mode Rejection Ratio 85 dB (minimum) at 50 Hz (with 10 Hz or 50 Hz filter)

85 dB (minimum) at 60 Hz (with 10 Hz or 60 Hz filter) Maximum Cable Impedance 25 Ω (for specified accuracy) Input Impedance >10M Ω Open-circuit Detection Time

7 ms to 1.515 seconds

(3)

Calibration The module performs autocalibration upon power-up

and whenever a channel is enabled. You can also

program the module to calibrate every five minutes.

(1) Rated working voltage is the maximum continuous voltage that can be applied at the input terminal, including

the input signal and the value that floats above ground potential (for example, 30V dc input signal and 20V dc

potential above ground). (2) For proper operation, both the plus and minus input terminals must be within ±10V dc of analog common. (3) Open-circuit detection time is equal to the module scan time, which is based on the number of enabled

channels, the filter frequency of each channel, and whether cyclic calibration is enabled..

Publication 1762-UM002A-EN-P - July 2002

Specifications A-3

Specification Value

Module Error over Full Temperature Range (0 to +55°C [+32°F to +131°F])

CJC Accuracy ±1.3°C (±2.34°F) Maximum Overload at Input

Terminals Input Group to Bus Isolation 720V dc for 1 minute (qualification test)

Input Channel Configuration via configuration software screen or the user program (by

Module OK LED On: module has power, has passed internal diagnostics, and is

Channel Diagnostics Over- or under-range and open-circuit by bit reporting Vendor I.D. Code 1 Product Type Code 10 Product Code 64

(1) Maximum current input is limited due to input impedance.

See “Accuracy” on page A-4.

±35V dc continuous

30V ac/30V dc working voltage

writing a unique bit pattern into the module’s configuration file).

communicating over the bus. Off: Any of the above is not true.

(1)

Repeatability at 25°C (77°F)

(1) (2)

Input Type Repeatability for

10 Hz Filter

Thermocouple J ±0.1°C [±0.18°F] Thermocouple N (-110°C to +1300°C [-166°F to +2372°F]) ±0.1°C [±0.18°F] Thermocouple N (-210°C to -110°C [-346°F to -166°F]) ±0.25°C [±0.45°F] Thermocouple T (-170°C to +400°C [-274°F to +752°F]) ±0 .1°C [±0.18°F] Thermocouple T (-270°C to -170°C [-454°F to -274°F]) ±1.5°C [±2.7°F] Thermocouple K (-270°C to +1370°C [-454°F to +2498°F]) ±0.1°C [±0.18°F] Thermocouple K (-270°C to -170°C [-454°F to -274°F]) ±2.0°C [±3.6°F] Thermocouple E (-220°C to +1000°C [-364°F to +1832°F]) ±0.1°C [±0.18°F] Thermocouple E (-270°C to -220°C [-454°F to -364°F]) ±1.0°C [±1.8°F] Thermocouples S and R ±0.4°C [±0.72°F] Thermocouple C ±0.2°C [±0.36°F] Thermocouple B ±0.7°C [±1.26°F] ±50 mV ±6 µV ±100 mV ±6 µV

(1) Repeatability is the ability of the input module to register the same reading in successive measurements for the

same input signal.

(2) Repeatability at any other temperature in the 0 to 60°C (32 to 140°F) range is the same as long as the

temperature is stable.

Publication 1762-UM002A-EN-P - July 2002

A-4 Specifications

Accuracy

With Autocalibration Enabled Without Autocalibration

(2) (3)

for 10 Hz, 50 Hz and 60

at 0 to 60°C [32 to 140°F]

Input Type

Accuracy

(1)

Hz Filters (max.) at 25°C [77°F]

Ambient

Thermocouple J (-210°C to 1200°C [-346°F to 2192°F]) ±0.6°C [± 1.1°F] ±0.9°C [± 1.7°F] ±0.0218°C/°C [±0.0218°F/°F] Thermocouple N (-200°C to +1300°C [-328°F to 2372°F]) ±1°C [± 1.8°F] ±1.5°C [±2.7°F] ±0.0367°C/°C [±0.0367°F/°F] Thermocouple N (-210°C to -200°C [-346°F to -328°F]) ±1.2°C [±2.2°F] ±1.8°C [±3.3°F] ±0.0424°C/°C [±0.0424°F/°F] Thermocouple T (-230°C to +400°C [-382°F to +752°F]) ±1°C [± 1.8°F] ±1.5°C [±2.7°F] ±0.0349°C/°C [±0.0349°F/°F] Thermocouple T (-270°C to -230°C [-454°F to -382°F]) ±5.4°C [± 9.8°F] ±7.0°C [±12.6°F] ±0.3500°C/°C [±0.3500°F/°F]

Maximum Temperature Drift

at 0 to 60°C [32 to 140°F] Ambient

(2) (4)

Thermocouple K (-230°C to +1370°C [-382°F to

±1°C [± 1.8°F] ±1.5°C [±2.7°F] ±0.4995°C/°C [±0.4995°F/°F]

+2498°F]) Thermocouple K (-270°C to -225°C [-454°F to -373°F]) ±7.5°C [± 13.5°F] ±10°C [± 18°F] ±0.0378°C/°C [±0.0378°F/°F] Thermocouple E (-210°C to +1000°C [-346°F to

±0.5°C [± 0.9°F] ±0.8°C [±1.5°F] ±0.0199°C/°C [±0.0199°F/°F]

+1832°F]) Thermocouple E (-270°C to -210°C [-454°F to -346°F]) ±4.2°C [± 7.6°F] ±6.3°C [±11.4°F] ±0.2698°C/°C [±0.2698°F/°F] Thermocouple R ±1.7°C [± 3.1°F] ±2.6°C [± 4.7°F] ±0.0613°C/°C [±0.0613°F/°F] Thermocouple S ±1.7°C [± 3.1°F] ±2.6°C [± 4.7°F] ±0.0600°C/°C [±0.0600°F/°F] Thermocouple C ±1.8°C [±3.3°F] ±3.5°C [±6.3°F] ±0.0899°C/°C [±0.0899°F/°F] Thermocouple B ±3.0°C [±5.4°F] ±4.5°C [±8.1°F] ±0.1009°C/°C [±0.1009°F/°F] ±50 mV ±15 µV ±25 µV

±100 mV ±20 µV ±30 µV

(1) The module uses the National Institute of Standards and Technology (NIST) ITS-90 standard for thermocouple linearization. (2) Accuracy and temperature drift information does not include the affects of errors or drift in the cold junction compensation circuit.

(3) Accuracy is dependent upon the analog/digital converter output rate selection, data format, and input noise. (4) Temperature drift with autocalibration is slightly better than without autocalibration.

TIP

For more detailed accuracy information, see the accuracy graphs on pages A-5 through A-21.

±0.44

µV/°C [±0.80µV/°F]

±0.69

µV/°C [±01.25µV/°F]

Publication 1762-UM002A-EN-P - July 2002

Specifications A-5

Accuracy °C

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Accuracy Versu

s Thermocouple Temperature and Filter

Frequency

The following graphs show the module’s accuracy when operating at 25°C for each thermocouple type over the thermocouple’s temperature range for each frequency. The effect of errors in cold junction compensation is not included.

Figure A.1 Module Accuracy at 25°C (77°F) Ambient for Type B Thermocouple Using 10, 50, and 60 Hz Filter

10 Hz 50 Hz 60 Hz

0.0 200 400 600 800 1000 1200 1 400 1600 1800 2000

Thermocouple Temperature °C

7.0

6.0

5.0

4.0

3.0

Accuracy °F

2.0

1.0

0.0 500 1000 1500 2000 2500 3000 3500

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-6 Specifications

Figure A.2 Module Accuracy at 25°C (77°F) Ambient for Type B Thermocouple Using 250, 500, and 1 kHz Filter

240

200

160

120

Accuracy °C

200 400 600 800 1000 1200 1400 1600 1800 2000

Thermocouple Temperature °C

400 350 300 250 200

Accuracy °F

150 100

500 1000 1500 2000 2500 3000 3500

Thermocouple Temperature °F

250 Hz 500 Hz 1000Hz

Publication 1762-UM002A-EN-P - July 2002

Figure A.3 Module Accuracy at 25°C (77°F) Ambient for Type C Thermocouple Using 10, 50, and 60 Hz Filter

1.8

1.6

1.4

1.2

1.0

0.8

Accuracy °C

0.6

0.4

0.2

0.0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400

Thermocouple Temperature °C

Specifications A-7

10 Hz 50 Hz 60 Hz

3.5

3.0

2.5

2.0

1.5

Accuracy °F

1.0

0.5

0.0 0 500 1000 1500 2000 2500 3000 3500 4000 4500

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-8 Specifications

Figure A.4 Module Accuracy at 25°C (77°F) Ambient for Type C Thermocouple Using 250, 500, and 1 kHz Filter

100

90 80 70 60 50 40

Accuracy °C

30 20 10

0 400 800 1200 1600 2000 2400

Thermocouple Temperature °C

250 Hz 500 Hz 1000Hz

180 160 140 120 100

Accuracy °F

60 40 20

0 500 1000 1500 2000 2500 3000 3500 4000 4500

Thermocouple Temperature °F

250 Hz 500 Hz 1000Hz

Publication 1762-UM002A-EN-P - July 2002

5.0

4.0

Specifications A-9

Figure A.5 Module Accuracy at 25°C (77°F) Ambient for Type E Thermocouple Using 10, 50, and 60 Hz Filter

3.0

2.0

Accuracy °C

1.0

0.0

-400 -200 0 200 400 600 800 1000

Thermocouple Temperature °C

9.0

8.0

7.0

6.0

5.0

4.0

Accuracy °F

3.0

2.0

1.0

0.0

-500 0 500 1000 1500 2000

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-10 Specifications

Figure A.6 Module Accuracy at 25°C (77°F) Ambient for Type E Thermocouple Using 250, 500, and 1 kHz Filter

70 60 50 40 30

Accuracy °C Accuracy °F

20 10

-400 -200 0 200 400 600 800 1000

Thermocouple Temperature °C

250 Hz 500 Hz 1000Hz

120 110 100

90 80 70 60 50 40 30 20 10

-500 0 500 1000 1500 2000

Thermocouple Temperature °F

250 Hz 500 Hz 1000Hz

Publication 1762-UM002A-EN-P - July 2002

Figure A.7 Module Accuracy at 25°C (77°F) Ambient for Type J Thermocouple Using 10, 50, and 60 Hz Filter

0.7

0.6

0.5

0.4

0.3

Accuracy °C

0.2

0.1

-400 -200 0 200 400 600 800 1000 1200

Thermocouple Temperature °C

Specifications A-11

10 Hz 50 Hz 60 Hz

1.2

1.0

0.8

0.6

Accuracy °F

0.4

0.2

0.0

-400 0 400 800 1200 1600 2000 2400

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-12 Specifications

Figure A.8 Module Accuracy at 25°C (77°F) Ambient for Type J Thermocouple Using 250, 500, and 1 kHz Filter

40 35 30 25 20

Accuracy °C

15 10

5 0

-400 -200 0 200 400 600 800 1000 1200

Thermocouple Temperature °C

250 Hz 500 Hz 1000Hz

70 60 50 40 30

Accuracy °F

20 10

-400 0 400 800 1200 1600 2000 2400

Thermocouple Temperature °F

250 Hz 500 Hz 1000 Hz

Publication 1762-UM002A-EN-P - July 2002

Figure A.9 Module Accuracy at 25°C (77°F) Ambient for Type K Thermocouple Using 10, 50, and 60 Hz Filter

9.0

8.0

7.0

6.0

5.0

4.0

Accuracy °C

3.0

2.0

1.0

0.0

-400 -200 0 200 400 600 800 1000 1200 1400

Thermocouple Temperature °C

Specifications A-13

10 Hz 50 Hz 60 Hz

16.0

14.0

12.0

10.0

8.0

Accuracy °F

6.0

4.0

2.0

0.0

-500 0 500 1000 1500 2000 2500

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-14 Specifications

Figure A.10 Module Accuracy at 25°C (77°F) Ambient for Type K Thermocouple Using 250, 500, and 1 kHz Filter

100

90 80 70 60 50 40

Accuracy °C

30 20 10

-400 -200 0 200 400 600 800 1000 1200 1400

Thermocouple Temperature °C

250 Hz 500 Hz 1000 Hz

160 140 120 100

Accuracy °F

60 40 20

-500 0 500 1000 1500 2000 2500

Thermocouple Temperature °F

250 Hz 500 Hz 1000 Hz

Publication 1762-UM002A-EN-P - July 2002

Figure A.11 Module Accuracy at 25°C (77°F) Ambient for Type N Thermocouple Using 10, 50, and 60 Hz Filter

1.4

1.2

1.0

0.8

0.6

Accuracy °C Accuracy °F

0.4

0.2

0.0

-400 -200 0 200 400 600 800 1000 1200 1400

Thermocouple Temperature °C

Specifications A-15

10 H z 50 H z 60 H z

2.5

2.0

1.5

1.0

0.5

0.0

-500 0 500 1000 1500 2000 2500

Thermocouple Temperature °F

10 H z 50 H z 60 H z

Publication 1762-UM002A-EN-P - July 2002

A-16 Specifications

Figure A.12 Module Accuracy at 25°C (77°F) Ambient for Type N Thermocouple Using 250, 500, and 1 kHz Filter

70 60 50 40 30

Accuracy °C Accuracy °F

20 10

-400 -200 0 200 400 600 800 1000 1200 1400

Thermocouple Temperature °C

250 Hz 500 Hz 1000 Hz

140 120 100

80 60 40 20

-500 0 500 1000 1500 2000 2500

Thermocouple Temperature °F

250 Hz 500 Hz 1000 Hz

Publication 1762-UM002A-EN-P - July 2002

2.5

2.0

Specifications A-17

Figure A.13 Module Accuracy at 25°C (77°F) Ambient for Type R Thermocouple Using 10, 50, and 60 Hz Filter

1.5

1.0

Accuracy °C Accuracy °F

0.5

0.0 0 200 400 600 800 1000 1200 1400 1600 1800

Thermocouple Temperature °C

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0 0 500 1000 1500 2000 2500 3000 3500

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-18 Specifications

Figure A.14 Module Accuracy at 25°C (77°F) Ambient for Type R Thermocouple Using 250, 500, and 1 kHz Filter

140 120 100

80 60

Accuracy °C Accuracy °F

40 20

0 200 400 600 800 1000 1200 1400 1600 1800

Thermocouple Temperature °C

250

200

150

100

250 Hz 500 Hz 1000 Hz

0 500 1000 1500 2000 2500 3000 3500

Publication 1762-UM002A-EN-P - July 2002

Thermocouple Temperature °F

2. 5

2. 0

Specifications A-19

Figure A.15 Module Accuracy at 25°C (77°F) Ambient for Type S Thermocouple Using 10, 50, and 60 Hz Filter

1. 5

1. 0

Accuracy °C Accuracy °F

0. 5

0. 0

4. 5

4. 0

3. 5

3. 0

2. 5

2. 0

1. 5

1. 0

0. 5

0. 0

10 Hz 50 Hz 60 Hz

0 200 400 600 800 1000 1200 1400 1600 1800

Thermocouple Temperature °C

10 Hz 50 Hz 60 Hz

0 500 1000 1500 2000 2500 3000 3500

Thermocouple Temperature °F

Publication 1762-UM002A-EN-P - July 2002

A-20 Specifications

Figure A.16 Module Accuracy at 25°C (77°F) Ambient for Type S Thermocouple Using 250, 500, and 1 kHz Filter

140 120 100

80 60

Accuracy °C

40 20

0 200 400 600 800 1000 1200 1400 1600 1800

Thermocouple Temperature °C

250 Hz 500 Hz 1000 Hz

250

200

150

100

Accuracy °F

0 500 1000 1500 2000 2500 3000 3500

Thermocouple Temperature °F

250 Hz 500 Hz 1000 Hz

Publication 1762-UM002A-EN-P - July 2002

Specifications A-21

Figure A.17 Module Accuracy at 25°C (77°F) Ambient for Type T Thermocouple Using 10, 50, and 60 Hz Filter

Accuracy °C

-300 -200 -100 0 100 200 300 400

Thermocouple Temperature °C

11 10

9 8 7 6 5

Accuracy °F

4 3 2 1 0

-600 -400 -200 0 200 400 600 800

Thermocouple Temperature °F

10 Hz 50 Hz 60 Hz

Publication 1762-UM002A-EN-P - July 2002

A-22 Specifications

Figure A.18 Module Accuracy at 25°C (77°F) Ambient for Type T Thermocouple Using 250, 500, and 1 kHz Filter

100

Accuracy °C

-300 -200 -100 0 100 200 300 400

Thermocouple Temperature °C

160 140 120 100

Accuracy °F

250 Hz 500 Hz 1000 Hz

40 20

-600 -400 -200 0 200 400 600 800

Publication 1762-UM002A-EN-P - July 2002

Thermocouple Temperature °F

Appendix

Two’s Complement Binary Numbers

The processor memory stores 16-bit binary numbers. Two’s complement binary is used when performing mathematical calculations internal to the processor. Analog input values from the analog modules are returned to the processor in 16-bit two’s complement binary format. For positive numbers, the binary notation and two’s complement binary notation are identical.

As indicated in the figure on the next page, each position in the number has a decimal value, beginning at the right with 2 at the left with 2

. Each position can be 0 or 1 in the processor memory. A 0 indicates a value of 0; a 1 indicates the decimal value of the position. The equivalent decimal value of the binary number is the sum of the position values.

and ending

Positive Decimal Values

The far left position is always 0 for positive values. As indicated in the figure below, this limits the maximum positive decimal value to 32767 (all positions are 1 except the far left position). For example:

0000 1001 0000 1110 = 2

0010 0011 0010 1000 = 2

0111111111111111

11+28+23+22+21

13+29+28+25+23

1 x 2 = 16384

0 x 2 = 0

= 2048+256+8+4+2 = 2318

= 8192+512+256+32+8 = 9000

1 x 2 = 8192

1 x 2 = 4096

1 x 2 = 2048

1 x 2 = 1024

1 x 2 = 512

1 x 2 = 256

1 x 2 = 128

1 x 2 = 64

1 x 2 = 32

1 x 2 = 16

1 x 2 = 8

This position is always 0 for positive numbers.

1 x 2 = 4

1 x 2 = 2

1 x 2 = 1

16384

8192 4096 2048 1024

512 256 128

64 32 16

8 4

2 1

32767

1 Publication 1762-UM002A-EN-P - July 2002

B-2 Two’s Complement Binary Numbers

Negative Decimal Values

In two’s complement notation, the far left position is always 1 for negative values. The equivalent decimal value of the binary number is obtained by subtracting the value of the far left position, 32768, from the sum of the values of the other positions. In the figure below (all positions are 1), the value is 32767 - 32768 = -1. For example:

1111 1000 0010 0011 = (2

14+213+212+211+25+21+20

) - 215 =

(16384+8192+4096+2048+32+2+1) - 32768 = 30755 - 32768 = -2013

1 x 2 = 16384

1 x 2 = 8192

1 x 2 = 4096

1 x 2 = 2048

1 x 2 = 1024

1 x 2 = 512

1 x 2 = 256

1 x 2 = 128

1 x 2 = 64

1 x 2 = 32

1 x 2 = 16

1 x 2 = 8

1 x 2 = 4

1 x 2 = 2

1111111111111111

1 x 2 = 32768

This position is always 1 for negative numbers.

16384

1 x 2 = 1

32767

8192 4096 2048 1024

512 256 128

64 32 16

8 4 2 1

Publication 1762-UM002A-EN-P - July 2002

Rockwell Automation 1762-IT4 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Table of Contents

Preface

Who Should Use This Manual

How to Use This Manual

Conventions Used in This Manual

Rockwell Automation Support

Overview

General Description

System Overview

Installation and Wiring

Compliance to European Union Directives

Power Requirements

General Considerations

Mounting

System Assembly

Field Wiring Connections

Wiring

Cold Junction Compensation

Calibration

Module Data, Status, and Channel Configuration

Module Memory Map

Accessing Input Image File Data

Input Data File

Configuring Channels

Determining Effective Resolution and Range

Determining Module Update Time

Diagnostics and Troubleshooting

Safety Considerations

Module Operation vs. Channel Operation

Power-up Diagnostics

Channel Diagnostics

Non-critical vs. Critical Module Errors

Module Error Definition Table

Error Codes

Contacting Rockwell Automation

General Specifications

Specifications

Input Specifications

Accuracy

Two’s Complement Binary Numbers

Positive Decimal Values

Negative Decimal Values