Rockwell Automation 1794-IT8, D17946.5.7 User Manual

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Allen-Bradley

Thermocouple/ Millivolt Input

User

Module

(Cat. No. 1794-IT8)

Manual

Important User Information

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

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for 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 which 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 in part, without written permission of Allen–Bradley Company, Inc. is prohibited.

Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or

death, property damage, or economic loss.

Attention helps you:

• identify a hazard

• avoid the hazard

• recognize the consequences

Important: Identifies information that is especially important for

successful application and understanding of the product.

Important: We recommend you frequently backup your application

programs on appropriate storage medium to avoid possible data loss.

DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc. PLC, PLC–2, PLC–3, and PLC–5 are registered trademarks of Allen-Bradley Company, Inc. Windows is a trademark of Microsoft. Microsoft is a registered trademark of Microsoft IBM is a registered trademark of International Business Machines, Incorporated.

All other brand and product names are trademarks or registered trademarks of their respective companies.



The information below summarizes the changes to the company-wide templates since the last release.

New Information

Updated Information

The following new information has been added to this manual:

• the “L” type thermocouple selection has been added for use in

some European markets.

Calibration procedures have been revised to eliminate 1 method in order to better control calibration results.

Change Bars

The areas in this manual which are different from previous editions are marked with change bars (as shown to the right of this paragraph) to indicate the addition of new or revised information.

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1794-6.5.7 – April 1997

soc–ii Summary of Changes

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1794-6.5.7 – April 1997

Overview of Flex I/O and your Thermocouple/mV Module

How to Install Your Thermocouple/mV Input Module

Chapter 1

Chapter Objectives The FLEX I/O System How

FLEX I/O Analog Modules Communicate with Programmable

Controllers

Typical

Communication Between an Adapter and a Module Features Chapter Summary

of your Modules

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Chapter 2

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Before Y European

Power Requirements

Installing Connecting

Module Chapter Summary

ou Install Y

Union Directive Compliance EMC Directive Low V

oltage Directive

Wiring

the T

the Module

Wiring for the Thermocouple/mV Module

Example

erminal Base Unit

Example

emperature T

Indicators

our Input Module

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erminal Base Units (1794-TB2 and -TB3 shown)

of Millivolt Input Wiring to a 1794-TB3 3-wire Thermocouple Wiring to a 1794-TB3T

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erminal Base Unit

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1–1 1–1

1–1 1–2 1–3 1–3

2–1 2–1 2–1 2–1 2–2 2–2 2–3 2–4 2–5

2–7 2–7

2–8 2–8

Module Programming

Chapter 3

Chapter Objectives Block

ransfer Programming

Sample

Chapter Summary

programs for FLEX I/O Analog Modules PLC-3 Programming PLC-5 Programming PLC-2 Programming

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3–1 3–1 3–2 3–2 3–3 3–4 3–4

Table of Contentsii

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

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Chapter 4

Chapter Objectives Configuring Y Range Input

Scaling

Hardware

Throughput Reading Data From Y Mapping

Thermocouple/mV

Thermocouple/mV Input Module (1794-IT8) Read

Thermocouple/mV

Word/Bit Chapter Summary

our Thermocouple/mV Module

Selection

First Notch Filter

Data for the Analog Modules

Input Module

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in Normal Mode

our Module

Input Module (1794-IT8) Image T

Input Module (1794-IT8) W

Descriptions for the 1794-IT8 Thermocouple/mV

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Chapter 5

Chapter Objectives About DeviceNet Manager Polled I/O Structure

Adapter System Mapping

Thermocouple/mV

Defaults

Input Status W

Throughput

Data into the Image T

Thermocouple/mV Input Module (1794-IT8) Read Thermocouple/mV Word/Bit

Input Module

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ord

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able

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Input Module (1794-IT8) Image T

Input Module (1794-IT8) W

Descriptions for the 1794-IT8 Thermocouple/mV

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able Mapping

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rite

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able Mapping

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rite

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4–1 4–1 4–2 4–2 4–3 4–3 4–4 4–4 4–4 4–4 4–5

4–5 4–7

5–1 5–1 5–1 5–2 5–3 5–3 5–3 5–3 5–4

5–4 5–7

Calibrating Your Module

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1794-6.5.7

Chapter 6

Chapter Objective General Tools Removing

Manually

Information

and Equipment

Lead Wire or Thermocouple Extension Wire Resistance

Method

1 6–2

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Method

2 6–3

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Calibrating your Thermocouple/mV Input Module

Flow

Chart for Calibration Procedure Calibration Wiring Read/Write W Offset Gain

Setups

Connections for the Thermocouple Module

Calibration

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ords for Calibration

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6–1 6–1 6–2 6–2

6–4 6–5 6–6 6–6 6–7 6–7 6–8

Table of Contents iii

Specifications

Calibrating Y

Software (Cat. No. 1787-MGR) Offset Gain

our Thermocouple/mV Module using DeviceNetManager

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Calibration

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Appendix A

Specifications Derating Curve

Resolution Curves for Thermocouples Type

B Thermocouple

Type

E Thermocouple

Type

C Thermocouple Type J Thermocouple Type

K Thermocouple Type

R Thermocouple Type

S Thermocouple Type

T Thermocouple Type

N Thermocouple Worst Case Accuracy for the Thermocouple/mV Module Error

Due to Open Circuit Current Through Loop Resistance Worst

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Case Repeatability for the Thermocouple/mV Input Module

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6–9 6–9

6–1

A–1 A–2 A–3 A–3 A–3 A–4 A–4 A–5 A–5 A–6 A–6 A–7 A–7 A–8 A–8

1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermocouple Restrictions (Extracted from NBS Monograph 125 (IPTS–68))

Appendix B

General

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(Platinum – 30% Rhodium vs Platinum – 6% Rhodium) T

Thermocouples

E (Nickel–Chromium vs Copper–Nickel <Constantan*>) Type

Thermocouple J (Iron vs Copper–Nickel <Constantan*>) T K (Nickel–Chromium vs Nickel–Aluminum) T R

(Platinum–13% Rhodium vs Platinum) and

S (Platinum–10% Rhodium vs Platinum) T T (Copper vs Copper–Nickel <Constantan*>) T

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ype Thermocouple

ype Thermocouples

ype Thermocouple

ype

. . .

. .

B–1 B–1 B–2

B–2 B–4

B–5 B–5

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Table of Contentsiv

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1794-6.5.7

Using This Manual

Preface

Preface Objectives

Audience

Vocabulary

What This Manual Contains

Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently.

We assume that you have previously used an Allen-Bradley programmable controller, that you are familiar with its features, and that you are familiar with the terminology we use. If not, read the user manual for your processor before reading this manual.

In addition, if you are using this module in a DeviceNet system, you must be familiar with:

• DeviceNetManager

• Microsoft Windows

Software, cat. no. 1787-MGR

In this manual, we refer to:

• the individual thermocouple/mV module as the “module.”

• the programmable controller as the “controller” or the

“processor.”

The contents of this manual are as follows:

Chapter Title What’s Covered

3 Module Programming

6 Calibrating Your Module

Appendix

A Specifications

B Thermocouple Restrictions Extracted from NBS Monograph 125 (IPTS–68)

Overview of Flex I/O and Your Thermocouple/mV Module

How to Install Your Thermocouple/mV Input Module

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

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Describes features, capabilities, and hardware components.

Installation and connecting wiring

Block transfer programming and programming examples

Describes block transfer write and block transfer read configurations, including complete bit/word descriptions.

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

Lists the tools needed, and the methods used to calibrate the thermocouple input module

Module specifications, derating curve, resolution curves for thermocouples, worst case accuracy and error due to open circuit current.

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1794-6.5.7 – April 1997

Using This ManualP–2

Catalog

Conventions

For Additional Information

Number

1787-MGR DeviceNetManager Software User Manual 1787-6.5.3

1794 1794 FLEX I/O Product Data 1794-2.1

1794-ADN DeviceNet Adapter 1794-5.14 1794-6.5.5

1794-ASB/C Remote I/O Adapter 1794-5.46 1794-6.5.9

We use these conventions in this manual:

this manual, we show: Like this:

that there is more information about a topic in another chapter in this manual

that there is more information about the topic in another manual

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

Publications

Description

Industrial Automation Wiring and Grounding Guidelines 1770-4.1

Installation

Instructions

User

Manual

Summary

This preface gave you information on how to use this manual efficiently. The next chapter introduces you to the remote I/O adapter module.

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1794-6.5.7 – April 1997

Chapter

Overview of FLEX I/O and your Thermocouple/mV Module

Chapter Objectives

The FLEX I/O System

Adapter/Power Supply Terminal Base I/O Module

In this chapter, we tell you:

• what the FLEX I/O system is and what it contains

• how FLEX I/O modules communicate with programmable

controllers

• the features of your thermocouple module

FLEX I/O is a small, modular I/O system for distributed applications that performs all of the functions of rack-based I/O. The FLEX I/O system contains the following components shown below:

How FLEX I/O Analog Modules Communicate with Programmable Controllers

20125

• adapter/power supply – powers the internal logic for as many as

eight I/O modules

• terminal base – contains a terminal strip to terminate wiring for

thermocouple or millivolt inputs.

• I/O module – contains the bus interface and circuitry needed to

perform specific functions related to your application

FLEX I/O thermocouple/mV modules are block transfer modules that interface analog signals with any Allen-Bradley programmable controllers that have block transfer capability. Block transfer programming moves input or output data words between the module’s memory and a designated area in the processor data table. Block transfer programming also moves configuration words from the processor data table to module memory.

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Overview of FLEX I/O and your Thermocouple/mV Module 1–2

The adapter/power supply transfers data to the module (block transfer write) and from the module (block transfer read) using BTW and BTR instructions in your ladder diagram program. These instructions let the adapter obtain input or output values and status from the module, and let you establish the module’s mode of operation. The illustration describes the communication process.

Typical Communication Between an Adapter and a Module

ADAPTER

ACTIVE FAULT

Allen-Bradley

LOCAL FAULT

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

Flexbus

POWER SUPPLY

RIO ADAPTER

1794-ASB

24VDC

Your ladder program instructs the adapter to perform a BTR of the values and stores them in a data table.

The adapter and module determine that the transfer was made without error and input values are within specified range.

Your ladder program can use and/or move the data (if valid) before it is written over by the transfer of new data in a subsequent transfer.

INPUT

+– +–

External devices transmit analog signals to the module.

Allen-Bradley

THERMOCOUPLE

INPUT 8 CHANNEL

INPUT 2 INPUT 4 INPUT 6INPUT 1 INPUT 3 INPUT 5 INPUT 7

+–+–+– +–+–+–

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

1794–IT8

Publication

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

1794-6.5.7

Overview of FLEX I/O and your Thermocouple/mV Module 1–3

Features of your Modules

The module label identifies the keyswitch position, wiring and module type. A removable label provides space for writing individual designations per your application.

1794-IT8

Module Type

Allen-Bradley

INPUT

+– +–

THERMOCOUPLE

INPUT 2 INPUT 4 INPUT 6INPUT 1 INPUT 3 INPUT 5 INPUT 7

+– +– +– +–+–+–

INPUT 8 CHANNEL

Input Designators

1794–IT8

Removable Label

Keyswitch

Position Indicator (#3)

Power On Indicator

The thermocouple/mV module comes with 2 cold junction compensators. These are designed to mount in designated positions on the temperature terminal base unit (cat. no. 1794-TB3T). Refer to chapter 2 for installation instructions for the cold junction compensator assemblies.

Chapter Summary

In this chapter, you learned about the FLEX I/O system and the thermocouple module, and how they communicate with programmable controllers.

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Overview of FLEX I/O and your Thermocouple/mV Module 1–4

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Chapter

How to Install Your Thermocouple/mV Input Module

In this chapter, we tell you:

• how to install your module

• how to set the module keyswitch

• how to wire the terminal base

• about the indicators

Before You Install Your Input Module

European Union Directive Compliance

Before installing your thermocouple/mV module in the I/O chassis:

You need to: As described under:

Calculate the power requirements of all modules in each chassis.

Position the keyswitch on the terminal base Installing the Module, page 2–4

ATTENTION: The Thermocouple module does not receive power from the backplane. +24V dc power

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

EMC Directive

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

• EN 50081-2EMC – Generic Emission Standard, Part 2 –

Industrial Environment

• EN 50082-2EMC – Generic Immunity Standard, Part 2 –

Industrial Environment

must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.

Power Requirements, page 2-2

This product is intended for use in an industrial environment.

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2–2

How to Install Your Thermocouple/mV Input Module

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 EN 61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation Wiring and Grounding Guidelines For

Noise Immunity, publication 1770-4.1

• Guidelines for Handling Lithium Batteries, publication AG-5.4

• Automation Systems Catalog, publication B111

Power Requirements

The wiring of the terminal base unit is determined by the current draw through the terminal base. Make certain that the current draw does not exceed 10A.

ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power

connections may be necessary.

ATTENTION: Do not daisy chain power or ground from the thermocouple terminal base unit to any ac or dc discrete module terminal base unit.

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1794-6.5.7

How to Install Your Thermocouple/mV Input Module

Methods of wiring the terminal base units are shown in the illustration below.

Wiring the Terminal Base Units (1794-TB2 and -TB3 shown)

ATTENTION: Do not daisy chain power or

ground from the thermocouple terminal base unit to any ac or dc discrete module terminal base unit.

2–3

Daisy-chaining

Individual

24V dc or 120V ac

24V dc

Thermocouple

or Analog Module

24V dc

Thermocouple module wiring separate from discrete wiring.

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

Wiring

when total current draw is less than 10A

Discrete

Module

Thermocouple

or Analog Module

Thermocouple

or Analog Module

Thermocouple

or Analog Module

Discrete

Module

Note: Use this configuration if using any “noisy” dc discrete I/O modules in your system.

Thermocouple

or Analog Module

Discrete

Module

Combination

24V dc 24V dc

iring when total current draw is greater than 10A

Discrete

Module

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

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

Thermocouple

or Analog Module

Thermocouple

or Analog Module

Thermocouple

or Analog Module

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2–4

How to Install Your Thermocouple/mV Input Module

Installing the Module

The thermocouple/mV module mounts on a 1794-TB2, -TB3 or

-TB3T terminal base unit. Important: You must use a 1794-TB3T terminal base unit if you

are using the thermocouple/mV module for thermocouple inputs. You can use the 1794-TB2 or

-TB3 terminal base for millivolt inputs only.

1. Rotate the keyswitch (1) on the terminal base unit (2) clockwise

to position 3 as required for the thermocouple/mV module.

2. Make certain the flexbus connector (3) is pushed all the way to

the left to connect with the neighboring terminal base/adapter.

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

ATTENTION: Remove field-side power before removing or inserting the module. This module is

designed so you can remove and insert it under backplane power. When you remove or insert a

module with field-side power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

• sending an erroneous signal to your system’s field

devices causing unintended machine motion

• causing an explosion in a hazardous environment

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

3. Before installing the module, check to make sure that the pins on

the bottom of the module are straight so they will align properly with the female connector in the base unit.

4. Position the module (4) with its alignment bar (5) aligned with

the groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base

unit. The module is seated when the latching mechanism (7) is locked into the module.

Publication

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

base unit.

1794-6.5.7

How to Install Your Thermocouple/mV Input Module

2–5

Connecting Wiring for the Thermocouple/mV Module

1794-TB2

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

COM COM

V = 24V dc COM

= 24V dc common

These

and 1794-TB3

terminals on 1794-TB3 only

Thermocouple/mV module wiring is made through the terminal base unit on which the module mounts. The module comes with 2 cold junction compensators for use when using the thermocouple module in the thermocouple mode.

Compatible terminal base unit are:

Module 1794-TB2 1794-TB3 1794-TB3T

1794-IT8 Yes

The

1794-TB3T terminal base unit contains connections for cold junction

compensation for use with thermocouple modules.

For millivolt inputs only

Yes

1794-TB3T

–15

16–33

34–51

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

C N0 C N1 C N2 C CN3 C N4 C N5 C N6 C N7

VCJC CJCV

Where:

V = 24V dc C = 24V dc common CJC = cold junction compensation

Yes

N = additional input

Connecting Wiring using a 1794-TB2, -TB3 and -TB3T Terminal Base Units

= chassis ground

1. Connect the individual signal wiring to numbered terminals on the 0–15 row (A) on the terminal base unit. Connect the high side (+) to the even numbered terminals, and the low side (–) to the odd numbered terminals. See Table 2.A.

2. Connect shield return to the associated terminal on row B, as shown in Table 2.A.

• On 1794-TB2 and -TB3 bases only: terminate shields to the

associated shield return terminals on row (B).

• On 1794-TB3T bases only: terminate shields to terminals 39

to 46 on row C.

3. Connect +24V dc to terminal 34 on the 34-51 row (C), and 24V common to terminal 16 on the B row.

Important: To reduce susceptibility to noise, power analog modules

and discrete modules from separate power supplies.

ATTENTION: Do not daisy chain power or ground from the thermocouple terminal base unit to any ac or

dc discrete module terminal base unit.

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Thermocouple

inals 36, 37, 38 and 47, 48, 49 are cold junction

How to Install Your Thermocouple/mV Input Module

Cold Junction Compensator Pt.No. 969424-01

ATTENTION: The Thermocouple/mV module does not receive power from the backplane. +24V dc power

must be applied to your module before installation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis.

4. On 1794-TB3T terminal base units: Connect the cold junction

compensation (CJC) wiring to terminals 36, 37 and 38 for inputs 0 through 3, and terminals 47, 48 and 49 for inputs 4 through 7.

Connect the tail of the cold junction compensator to any of the associated thermocouple input terminals: 0 through 7 for CJC connected to 36, 37 and 38; or 8 through 15 for CJC connected to 47, 48 and 49. The tail of the cold junction compensator shares

a terminal with an input.

5. If daisy chaining the +24V dc power to the next base unit,

connect a jumper from terminal 51 on this base unit to terminal 34 on the next base unit.

1234567891011121314150

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

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

1 51

0 –15 16–33 34–51

1794-TB2

1234567891011121314150

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

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

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

0 16–33 34–51

1794-TB3, -TB3T

–15

A B C

Table 2.A

Wiring

connections for the 1794-IT8 Thermocouple Input Module

Shield

Return

Channel

1794-TB2, -TB3 Terminal Base Units 1794-TB3T Terminal Base Unit

High Signal Terminal (+)

Low Signal

Terminal (–)

Shield

Return

High Signal Terminal (+)

Low Signal

Terminal (–)

0 0 1 17 0 1 39 1 2 3 19 2 3 40 2 4 5 21 4 5 41 3 6 7 23 6 7 42 4 8 9 25 8 9 43 5 10 11 27 10 11 44 6 12 13 29 12 13 45 7 14 15 31 14 15 46

24V dc Common 16 thru 33 16, 17, 19, 21, 23, 25, 27, 29, 31 and 33

+24V dc power 1794-TB2 – 34 and 51; 1794-TB3 – 34 thru 51 34, 35, 50 and 51

Terminals

39 to 46 are chassis ground.

erm

compensator terminals.

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How to Install Your Thermocouple/mV Input Module

ATTENTION: The thermocouple/mV modules do not receive power from the backplane. +24V dc power

must be applied to your module before operation. If power is not applied, the module position will appear to the adapter as an empty slot in your chassis. If the adapter does not recognize your module after installation is completed, cycle power to the adapter.

ATTENTION: Total current draw through the terminal base unit is limited to 10A. Separate power

connections to the terminal base unit may be necessary.

Example of Millivolt Input Wiring to a 1794-TB3 Terminal Base Unit

12 34567891011121314150

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

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

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

2–7

–15 16–33 34–51

1794-TB3

Millivolt Source

–

Millivolt input Channel 1

Channel 0 (Terminals 0, 1 and 17)

Example of 3-wire Thermocouple Wiring to a 1794-TB3T Temperature Terminal Base Unit

12 34567891011121314150

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

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

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

CJC CJC

–

1794-TB3T

0 16–33 34–51

Cold

Junction Compensator

Allen-Bradley PN 969424–01

(2 supplied with module)

–15

Channel 0 (Terminals 0, 1 and 39)

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How to Install Your Thermocouple/mV Input Module

Module Indicators

The thermocouple/mV module has one status indicator that is on when power is applied to the module. This indicator has 3 different states:

Allen-Bradley

THERMOCOUPLE INPUT 8 CHANNEL

INPUT

+– +–

A = Status Indicator – indicates diagnostic results and configuration status B = Insertable label for writing individual input designations

Color State Meaning

Red On Indicates a critical fault (diagnostic failure, etc.)

Blinking Indicates a noncritical fault (such as open sensor, input out of range, etc.)

Green On Module is configured and fully operational

Blinking Module is functional but not configured Off Module not powered

INPUT 2 INPUT 4 INPUT 6INPUT 1 INPUT 3 INPUT 5 INPUT 7

+– +–+– +–+–+–

1794–IT8

Chapter Summary

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

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

Chapter

Chapter Objectives

Block Transfer Programming

In this chapter, we tell you about:

• block transfer programming

• sample programs for the PLC-3 and PLC-5 processors

Your thermocouple/mV module communicates with the processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

A configuration block transfer write (BTW) is initiated when the thermocouple module is first powered up, and subsequently only when the programmer wants to enable or disable features of the module. The configuration BTW sets the bits which enable the programmable features of the module, such as scaling, alarms, ranges, etc. Block transfer reads are performed to retrieve information from the module.

Block transfer read (BTR) programming moves status and data from the module to the processor’s data table. The processor user program initiates the request to transfer data from the module to the processor. The transferred words contain module status, channel status and input data from the module.

ATTENTION: If the thermocouple/mV module is not powered up before the remote I/O adapter, the

The following sample programs are minimum programs; all rungs and conditioning must be included in your application program. You can disable BTRs, or add interlocks to prevent writes if desired. Do not eliminate any storage bits or interlocks included in the sample programs. If interlocks are removed, the program may not work properly.

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

adapter will not recognize the module. Make certain that the thermocouple/mV module is installed and powered before or simultaneously with the remote I/O adapter. If the adapter does not establish communication with the module, cycle power to the adapter.

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Module Programming

Sample programs for FLEX I/O Analog Modules

The following sample programs show you how to use your analog module efficiently when operating with a programmable controller.

These programs show you how to:

• configure the module

• read data from the module

These example programs illustrate the minimum programming required for communication to take place.

PLC-3 Programming

Block transfer instructions with the PLC-3 processor use one binary file in a data table section for module location and other related data. This is the block transfer control file. The block transfer data file stores data that you want transferred to your module (when programming a block transfer write) or from your module (when programming a block transfer read). The address of the block transfer data files are stored in the block transfer control file.

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

control file is required for every module.

Program

Action

At power-up in RUN mode, or when the processor is switched from PROG to RUN, the user program enables a block transfer read. Then it initiates a block transfer write to configure the module.

Thereafter, the program continuously performs read block transfers.

Note: You must create the data file for the block transfers before you enter the block transfer instructions.

The pushbutton allows the user to manually request a block transfer write.

A sample program segment with block transfer instructions is shown in Figure 3.1, and described below.

Figure 3.1 PLC-3 Family Sample Program Structure

BTR BLOCK XFER READ

RACK: GROUP: MODULE: CONTROL: DATA FILE:

LENGTH:

BTW BLOCK XFER WRITE

RACK: GROUP: MODULE:

CONTROL: DATA FILE: LENGTH:

7 0

0 #B3:0 #B4:0

0 #B3:0

#B5:0

Pushbutton

Power-up Bit

B4:10

Block Transfer Read Done Bit

B3:0

Block Transfer

rite Done Bit

B3:0

Done

Enable

Done

Error

Enable

Error

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Module Programming

PLC-5 Programming

The PLC-5 program is very similar to the PLC-3 program with the following exceptions:

1. Block transfer enable bits are used instead of done bits as the

conditions on each rung.

2. Separate block transfer control files are used for the block

transfer instructions.

Figure 3.2 PLC-5 Family Sample Program Structure

3–3

Program

Action

At power-up in RUN mode, or when the processor is switched from PROG to RUN, the user program enables a block transfer read. Then it initiates a block transfer write to configure the module.

Thereafter, the program continuously performs read block transfers.

The pushbutton allows the user to manually request a block transfer write.

BTR Enable Bit

Power-up Bit

N12:0

Pushbutton

N13:10

BTW Enable Bit

N12:5

BTR BLOCK

TRANSFER READ

RACK: GROUP: MODULE: CONTROL: DATA FILE:

LENGTH: CONTINUOUS: N

BTW BLOCK

TRANSFER WRITE

RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS: N

N12:0 N13:0

N12:5

N13:20

2 1

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Module Programming

PLC-2 Programming

The 1794 analog I/O modules are not recommended for use with PLC-2 family programmable controllers due to the number of digits needed for high resolution.

Chapter Summary

In this chapter, you learned how to program your programmable controller. You were given sample programs for your PLC-3 and PLC-5 family processors.

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Chapter

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

Chapter Objectives

Configuring Your Thermocouple/mV Module

In this chapter, we tell you about:

• configuring your module’s features

• entering your data

• reading data from your module

• the read block format

Because of the wide variety of possible configurations, you must configure your module to conform to the specific application that you have chosen. The module is configured using a group of data table words that are transferred to the module using a block transfer write instruction.

The software configurable features available for the thermocouple module are:

• input/output range selection, including full range and bipolar

• selectable first notch filter

• data reported in

Note: PLC-5 family programmable controllers that use 6200 software (version 5.2 or later) programming tools can take advantage of the IOCONFIG utility to configure these modules. IOCONFIG uses menu-based screens for configuration without having to set individual bits in particular locations. Refer to your 6200 software literature for details.

F, oC, unipolar or bipolar count

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r ocoupl

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

Range Selection

Input Scaling

Individual input channels are configurable to operate with the following sensor types:

Sensor Type Range

Voltage Millivolt –76.50 to +76.50mV Thermocouple

Type B 300 to 1800oC Type E –230 to 1000oC Type J –195 to 1200oC Type K –230 to 1372oC Type R –50 to 1768oC Type S –50 to 1768oC Type T –195 to 400oC Type N –270 to 1300oC Type C 0 to 2315oC Type L –175 to 800oC

You select individual channel ranges using write words 1 and 2 of the block transfer write instruction.

Scaling lets you report each channel in actual engineering units. Scaled values are in integer format.

Input Type Range Scaling Maximum Resolution

Millivolt –76.50 to +76.50mV –7650 to +7650 Type B 300 to 1800oC 3000 to 18000 0.1oC Type E –230 to 1000oC –2300 to 10000 0.1oC Type J –195 to 1200oC –1950 to 12000 0.1oC Type K –230 to 1372oC –2300 to 13720 0.1oC Type R –50 to 1768oC –500 to 17680 0.1oC Type S –50 to 1768oC –500 to 17680 0.1oC Type T –195 to 400oC –1950 to 4000 0.1oC Type N –270 to 1300oC –2700 to 13000 0.1oC Type C 0 to 2315oC 0 to 23150 0.1oC Type L –175 to 800oC –1750 to 8000 0.1oC

Type B 572 to 3272oF 5720 to 32720 0.1oF Type E –382 to 1832oF –3820 to 18320 0.1oF Type J –319 to 2192oF –3190 to 21920 0.1oF Type K –382 to 2502oF –3820 to 25020 0.1oF Type R –58 to 3214oF –580 to 32140 0.1oF Type S –58 to 3214oF –580 to 32140 0.1oF Type T –319 to 752oF –3190 to 7520 0.1oF Type N –450 to 2372oF –4500 to 23720 0.1oF Type C 32 to 4199oF 320 to 41990 0.1oF Type L –283 to 1472oF –2830 to 14720 0.1oF

Note:

In thermocouple mode, scaled number has an implied decimal point 1 digit from the right. For example, if reading is 18000, temperature is 1800.0. In millivolt mode, the implied decimal point is to the left of the last 2 digits. For example, if reading is 2250, actual reading is 22.50mV

10µV

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

You select input scaling using the designated words of the write block transfer instruction. Refer to the Bit/Word description for write word 0, bits 00 and 01.

4–3

Hardware First Notch Filter

A/D Filter First Notch

Frequency

(effective resolution)

Number of channels

scanned

1 325 145 85 75 55 37 31 28 2 650 290 170 150 110 74 62 56 3 975 435 255 225 165 111 93 84 4 1.3s 580 340 300 220 148 124 112 5 1.625s 725 425 375 275 185 155 140 6 1.95s 870 510 450 330 222 186 168 7 2.275s 1.015s 595 525 385 259 217 196 8 2.60s

Default

setting

(16-bits)

10Hz

A hardware filter in the analog to digital converter lets you select a frequency for the first notch of the filter. Selection of the filter influences the analog to digital output data rate and changes the module throughput. Module throughput is a function of the number of inputs used and the first notch filter. Both of these influence the time from a thermocouple input to arrival at the backplane.

Throughput in Normal Mode

25Hz

(16-bits)

1.16s 680 600 440 296 248 224

50Hz

(16-bits)

60Hz

(16-bits)

System Throughput (in ms and s)

100Hz

(16-bits)

250Hz

(13-bits)

500Hz

(11-bits)

1000Hz (9-bits)

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

Reading Data From Your Module

Mapping Data for the Analog Modules

Read programming moves status and data from the thermocouple

input module to the processor’s data table. The processor’s user

program initiates the request to transfer data from the

thermocouple/mV input module to the processor.

The following read and write words and bit/word descriptions

describe the information written to and read from the

thermocouple/mV input module. The module uses up to 11 words of

input image and up to 3 words of output image. Each word is

composed of 16 bits.

Thermocouple/mV Input Module (1794-IT8) Image Table Mapping

Module

Image

Reserved

Input Data Channel 0

I/O Image

Input Size

1 to 11 Words

Output Size

0 to 3 Words

Overrange

Calibration Mask

Input Data Channel 1 Input Data Channel 2

Input Data Channel 3 Input Data Channel 4 Input Data Channel 5

Input Data Channel 6 Input Data Channel 7

Underrange

Calibration Status

Configuration

Thermocouple Type Thermocouple Type

Thermocouple/mV Input Module (1794-IT8) Read

Decimal

Bit

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

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Read Word 0 Reserved

1 Channel 0 Input Data 2 Channel 1 Input Data 3 Channel 2 Input Data 4 Channel 3 Input Data 5 Channel 4 Input Data 6 Channel 5 Input Data 7 Channel 6 Input Data 8 Channel 7 Input Data

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4–5

Bit

9 Overrange Bits Underrange Bits

Bad

Cal

10 0 0 0 0 0

Cal

Done

Cal

Range

0 Diagnostic Status

PwrUpBad

Thermocouple/mV Input Module (1794-IT8) Write

Dec.

Bit

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

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Cal

Write Word 0 8-Bit Calibration Mask

1 Thermocouple 3 Type Thermocouple 2 Type Thermocouple 1 Type Thermocouple 0 Type 2 Thermocouple 7 Type Thermocouple 6 Type Thermocouple 5 Type Thermocouple 4 Type

Where: FDF

= fixed digital filter bit

Clk

Cal hi Cal lo

Filter Cutoff FDF Data Type

Word/Bit Descriptions for the 1794-IT8 Thermocouple/mV Input Module

Decimal

Word

Bit

(Octal Bit)

Description

Structure

CJC over

00010203040506070809101112131415Decimal 00010203040506071011121314151617Octal Bit

CJC

Under

Read Word 0 00–15 (00–17) Reserved Read Word 1 00–15 (00–17) Channel 0 Input data Read Word 2 00–15 (00–17) Channel 1 Input data Read Word 3 00–15 (00–17) Channel 2 Input data Read Word 4 00–15 (00–17) Channel 3 Input data Read Word 5 00–15 (00–17) Channel 4 Input data Read Word 6 00–15 (00–17) Channel 5 Input data Read Word 7 00–15 (00–17) Channel 6 Input data Read Word 8 00–15 (00–17) Channel 7 Input data Read Word 9

Read Word 10

00–07 (00–07) Underrange bits – these bits are set if the input signal is below the input channel’s minimum range. 08–15 (10–17) Overrange bits – these bits are set if 1), the input signal is above the input channel’s maximum range,

or 2), an open detector is detected. 00 (00) Cold Junction sensor underrange bit. – this bit is set if the cold junction temperature is below 0oC. 01 (01) Cold Junction sensor overrange bit. – this bit is set if the cold junction temperature is above 70oC. 02 (02) Bad Structure – this bit is set if an invalid thermocouple type is selected. 03 (03) Powerup bit – this bit is set (1) until configuration data is received by the module.

04–06 (04–06) Critical Error bits – If these bits are anything other than all zeroes, return the module to the factory for

repair 07 (07) Unused – set to 0 08 (10) Calibration Range bit – set to 1 if a reference signal is out of range during calibration 09 (11) Calibration Done bit – set to 1 after an initiated calibration cycle is complete. 10 (12) Calibration Bad bit – set to 1 if the channel has not had a valid calibration.

11–15 (13–17) Unused – set to 0

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Word

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

Decimal

Bit

(Octal Bit)

Description

Write Word 0

00–01 (00–01) Module Data Type

Bit 01 00 Definition

0 0oC (default) 0 1oF 1 0 Bipolar counts scaled between –32768 and +32767 1 1 Unipolar counts scaled between 0 and 65535

Bit 02 (02) Fixed Digital Filter – When this bit is set (1), a software digital filter is enabled. This filter settles to

100% of a Full Scale step input in 60 times the selected first notch filter time shown on page 4–3.

(Default – filter disabled.)

03–05 (03–05) A/D Filter First Notch Frequency

Bit 05 04 03 Definition

0 0 0 10Hz (default) 0 0 1 25Hz 0 1 0 50Hz 0 1 1 60Hz 1 0 0 100Hz 1 0 1 250Hz 1 1 0 500Hz

1 1 1 1000hZ 06 (06) Calibration High/Low bit – This bit is set during gain calibration; reset during offset calibration. 07 (07) Calibration clock – this bit must be set to 1 to prepare for a calibration cycle; then reset to 0 to initiate

calibration.

08–15 (10–17) Calibration mask – The channel, or channels, to be calibrated will have the correct mask bit set. Bit 8

corresponds to channel 0, bit 9 to channel 1, and so on.

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Word

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

Decimal

Bit

(Octal Bit)

Description

4–7

Write Word 1

Write Word 2

00–03 (00–03) Channel 0 Thermocouple Type

Bit 03 02 01 00 Thermocouple Type – Range

0 0 0 0 Millivolts (default) 0 0 0 1 B 300 to 1800oC (572 to 3272oF) 0 0 1 0 E –230 to 1000oC (–382 to 1832oF) 0 0 1 1 J –195 to 1200oC (–319 to 2192oF) 0 1 0 0 K –230 to 1372oC (–382 to 2502oF) 0 1 0 1 R –50 to 1768oC (–58 to 3214oF) 0 1 1 0 S –50 to 1768oC (–58 to 3214oF) 0 1 1 1 T –195 to 400oC (–319 to 752oF) 1 0 0 0 C 0 to 2315oC (32 to 4199oF) 1 0 0 1 N –270 to 1300oC (–450 to 2372oF) 1 0 1 0 L -175 to 800oC (-283 to 1472oF) 1 0 1 1 Reserved 1 1 0 0 Module reports cold junction temperature for channels 00–03 1 1 0 1 Module reports cold junction temperature for channels 04–07 1 1 1 0 Reserved

1 1 1 1 No sensor connected (do not scan) 04–07 (04–07) Channel 1 Thermocouple Type (see bits 00–03) 08–11 (10–13) Channel 2 Thermocouple Type (see bits 00–03) 12–15 (14–17) Channel 3 Thermocouple Type (see bits 00–03) 00–03 (00–03) Channel 4 Thermocouple Type (see write word 1, bits 00–03) 04–07 (04–07) Channel 5 Thermocouple Type (see write word 1, bits 00–03) 08–11 (10–13) Channel 6 Thermocouple Type (see write word 1, bits 00–03) 12–15 (14–17) Channel 7 Thermocouple Type (see write word 1, bits 00–03)

Chapter Summary

In this chapter, you learned how to configure your module’s features and enter your data.

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

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Chapter

ectives

Polled I

Structure

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Obj

About DeviceNet Manager

In this chapter, we tell you about:

• DeviceNetManager software

• I/O structure

• image table mapping

• factory defaults

DeviceNetManager software is a software tool used to configure your Flex I/O DeviceNet adapter and its related modules. This software tool can be connected to the adapter via the DeviceNet network.

You must know and understand how DeviceNet Manager works in order to add a device to the network. Refer to the DeviceNetManager Software User Manual, publication 1787-6.5.3, and the DeviceNet Adapter Module User Manual, publication 1794-6.5.5.

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

The first word of input data sent by the adapter is the Adapter Status Word. This is followed by the input data from each slot, in the order of the installed I/O modules. The Input data from Slot 0 is first after the status word, followed by Input data from Slot 2, and so on up to slot 7.

Network

Network WRITE

READ

DeviceNet Adapter

Read Data

Adapter

Status Slot 0 Input Data Slot 1 Input Data

...

Slot 7 Input Data

Write Data

Slot 0 Output Data Slot 1 Output Data

...

Slot 7 Output Data

...

Read Write

I/O Module

Slot 0

I/O Module

Slot 1

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Slot 7

5–2

ault

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Adapter Input Status Word

The input status word consists of:

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

• node address changed – 1 bit

• I/O status – 1 bit

I/O Module Fault Bits

15Bit: 01234567810 through 15

Not Used

I/O State Bit

Node Address Changed Bit

Slot 7

Slot 6

Slot 5

Slot 4

The adapter input status word bit descriptions are shown in the following table.

Bit Description Bit Explanation

0 This bit is set (1) when an error is detected in slot position 0. 1 This bit is set (1) when an error is detected in slot position 1. 2 This bit is set (1) when an error is detected in slot position 2.

I/O Module F

Node Address Changed 8

I/O State 9

3 This bit is set (1) when an error is detected in slot position 3. 4 This bit is set (1) when an error is detected in slot position 4. 5 This bit is set (1) when an error is detected in slot position 5. 6 This bit is set (1) when an error is detected in slot position 6. 7 This bit is set (1) when an error is detected in slot position 7.

This bit is set (1) when the node address switch setting has been changed since power up.

Bit = 0 – idle Bit = 1 – run

10 thru 15 Not used – sent as zeroes.

Slot 3

Slot 2

Slot 1

Slot 0

Publication

Possible causes for an I/O Module Fault are:

• transmission errors on the Flex I/O backplane

• a failed module

• a module removed from its terminal base

• incorrect module inserted in a slot position

• the slot is empty

The node address changed bit is set when the node address switch setting has been changed since power up. The new node address does not take affect until the adapter has been powered down and then powered back up.

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

5–3

System Throughput

SEE

PAGE 4–3

Mapping Data into the Image Table

System throughput, from analog input to backplane, is a function of:

• the configured A/D filter first notch frequency

• the number of channels actually configured for connection to a

specific sensor

The A/D converter which converts channel 0 through 7 analog data to a digital word provides a programmable first notch filter. You can set the position of the first notch of this filter during module configuration. The selection influences the A/D output data rate, thus affecting system throughput.

The number of channels included in each input scan also affects system throughput.

FLEX I/O thermocouple module data table mapping is shown below.

Thermocouple/mV Input Module (1794-IT8) Image Table Mapping

Module

Image

Reserved

Input Data Channel 0

I/O Image

Input Size

1 to 11 Words

Output Size

0 to 3 Words

Overrange

Calibration Mask

Input Data Channel 1 Input Data Channel 2

Input Data Channel 3 Input Data Channel 4 Input Data Channel 5

Input Data Channel 6 Input Data Channel 7

Underrange

Calibration Status

Configuration

Thermocouple Type Thermocouple Type

Thermocouple/mV Input Module (1794-IT8) Read

Dec.

Bit

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

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Read Word 1 Reserved Read Word 2 Channel 0 Input Data Read Word 3 Channel 1 Input Data Read Word 4 Channel 2 Input Data Read Word 5 Channel 3 Input Data Read Word 6 Channel 4 Input Data

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Bit

Read Word 7 Channel 5 Input Data Read Word 8 Channel 6 Input Data Read Word 9 Channel 7 Input Data

Read Word 10 Overrange Bits Underrange Bits

Bad

Read Word 11 0 0 0 0 0

Cal

Done

Cal

Range

0 Diagnostics

Pwr

Bad

Structure

Thermocouple/mV Input Module (1794-IT8) Write

Dec.

Bit

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

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Cal

Write Word 1 8-Bit Calibration Mask Write Word 2 Thermocouple 3 Type Thermocouple 2 Type Thermocouple 1 Type Thermocouple 0 Type

Write Word 3 Thermocouple 7 Type Thermocouple 6 Type Thermocouple 5 Type Thermocouple 4 Type

Where: FDF

= fixed digital filter bit

Clk

Cal hi Cal lo

Filter Cutoff FDF Data Type

Word/Bit Descriptions for the 1794-IT8 Thermocouple/mV Input Module

CJC over

00010203040506070809101112131415Dec. 00010203040506071011121314151617Octal Bit

CJC

Under

Decimal

Word

Read Word 1 00–15 (00–17) Reserved Read Word 2 00–15 (00–17) Channel 0 Input data Read Word 3 00–15 (00–17) Channel 1 Input data Read Word 4 00–15 (00–17) Channel 2 Input data Read Word 5 00–15 (00–17) Channel 3 Input data Read Word 6 00–15 (00–17) Channel 4 Input data Read Word 7 00–15 (00–17) Channel 5 Input data Read Word 8 00–15 (00–17) Channel 6 Input data Read Word 9 00–15 (00–17) Channel 7 Input data Read Word 10

Read Word 11

Bit

(Octal Bit)

Description

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

continu

Decimal

Word

Bit

(Octal Bit)

Description

5–5

Read Word 11

Write Word 1

03 (03) Powerup bit – this bit is set (1) until configuration data is received by the module.

04–06 (04–06)

Critical Fault bits – If these bits are anything other than zero, return the module to the factory for repair. 07 (07) Unused – set to 0 08 (10) Calibration Range bit – set to 1 if a reference signal is out of range during calibration 09 (11) Calibration Done bit – set to 1 after an initiated calibration cycle is complete. 10 (12) Calibration Bad bit – set to 1 if the channel has not had a valid calibration.

11–15 (13–17) Unused – set to 0 00–01 (00–01) Module Data Type

Bit 01 00 Definition

0 0oC (default) 0 1oF 1 0 Bipolar counts scaled between –32768 and +32767 1 1 Unipolar counts scaled between 0 and 65535

Bit 02 (02) Fixed Digital Filter – When this bit is set (1), a software digital filter is enabled. This filter settles to

100% of a Full Scale step input in 60 times the selected first notch filter time shown on page 4–3.

Default – filter disabled.

03–05 (03–05) A/D Filter First Notch Frequency

Bit 05 04 03 Definition

0 0 0 10Hz (default) 0 0 1 25Hz 0 1 0 50Hz 0 1 1 60Hz 1 0 0 100Hz 1 0 1 250Hz 1 1 0 500Hz

calibration.

08–15 (10–17) Calibration mask – The channel, or channels, to be calibrated will have the correct mask bit set. Bit 8

corresponds to channel 0, bit 9 to channel 1, and so on.

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5–6

Word

How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

Decimal

Bit

(Octal Bit)

Description

Write Word 2

Write Word 3

00–03 (00–03) Channel 0 Thermocouple Type

Bit 03 02 01 00 Thermocouple Type – Range

1 1 1 1 No sensor connected (do not scan) 04–07 (04–07) Channel 1 Thermocouple Type (see bits 00–03) 08–11 (10–13) Channel 2 Thermocouple Type (see bits 00–03) 12–15 (14–17) Channel 3 Thermocouple Type (see bits 00–03) 00–03 (00–03) Channel 4 Thermocouple Type (see write word 2, bits 00–03) 04–07 (04–07) Channel 5 Thermocouple Type (see write word 2, bits 00–03) 08–11 (10–13) Channel 6 Thermocouple Type (see write word 2, bits 00–03) 12–15 (14–17) Channel 7 Thermocouple Type (see write word 2, bits 00–03)

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5–7

Defaults

Each I/O module has default values associated with it. At default, each module will generate inputs/status and expect outputs/configuration.

Module Defaults for: Factory Defaults Real Time Size

Catalog

Number

1794-IT8 8 Thermocouple Input 11 4 10 0

Description

Input

Default

Output Default

Input

Default

Output

Default

Factory defaults are the values assigned by the adapter when you:

• first power up the system, and

• no previous stored settings have been applied.

For analog modules, the defaults reflect the actual number of input words/output words. For example, for the 8 thermocouple input analog module, you have 11 input words, and 4 output words.

You can change the I/O data size for a module by reducing the number of words mapped into the adapter module, as shown in “real time sizes.”

Real time sizes are the settings that provide optimal real time data to the adapter module.

Analog modules have 15 words assigned to them. This is divided into input words/output words. You can reduce the I/O data size to fewer words to increase data transfer over the backplane. For example, an 8 thermocouple input module has 11 words input/4 words output with factory default. You can reduce the write words to 0, thus eliminating the configuration setting and unused words. And you can reduce the read words to 10 by eliminating the calibration status words.

For information on using DeviceNetManager software to configure your adapter, refer to the DeviceNetManager Software User Manual, publication 1787-6.5.3.

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How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

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Chapter

Calibrating Your Module

Chapter Objective

General Information

In this chapter we tell you:

• what tools are needed to calibrate

• how to calibrate out lead wire resistance

• calibrate your module manually

• calibrate your module using DeviceNetManager software

Your module is shipped to you already calibrated. If a calibration check is required,follow the procedure below.

Perform module calibration periodically, based on your application. Module calibration may also be required to remove module error due

to aging of components In addition, calibration may be required to eliminate long lead wire

resistance to open circuit detection current. See “Error Due to Open Circuit Current Through Loop Resistance” in Appendix A.

Calibration can be accomplished using any of the following methods:

• manual calibration, as described below.

• 6200 I/O CONFIGURATION software (version 5.2 or later)–

refer to your 6200 software publications for procedures for calibrating.

• DeviceNetManager Software – refer to your DeviceNetManager

software documentation for the DeviceNet Adapter Module, Cat. No. 1794-ADN. Some portion of this calibration is included here for use by personnel proficient with DeviceNet Adapter configuration software.

Important: You can use a 1794-TB2 or -TB3 terminal base unit if

you are using the thermocouple/mV module in the millivolt mode only. You must use a 1794-TB3T terminal base unit for all thermocouple uses.

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Calibrating Your Module

Tools and Equipment

Tool or Equipment Description

Precision Voltage Source

Thermocouple Simulator

and Calibration source

Industrial Terminal and Interconnect Cable

Removing Lead Wire or Thermocouple Extension Wire Resistance

In order to calibrate your thermocouple input module you will need the following tools and equipment:

0–100mV, 1µV resolution

Programming terminal for A–B family processors

Analogic 3100, Data Precision 8200 or equivalent

Thermocouple Simulator/Calibrator Model 1120

The thermocouple/mV module has open circuit detection. This is accomplished by a 1µA current source in the module. This current flowing through the lead wire or thermocouple extension wire generates an error or offset voltage in the reading. Use the “Error Due to Open Circuit Current Through Loop Resistance” in appendix A to determine if the magnitude of the error is acceptable.

Calibrate this error out as follows:

Ectron Corporation 8159 Engineer Road San Diego, CA 92111-1980

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

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

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

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

1794-TB3, -TB3T

Ω

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

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

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

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

Disconnect the lead wires at the terminal base unit.

a. b.

Measure total loop resistance of both lead/extension wires and thermocouple.

If using a sensor other than a thermocouple, disconnect the lead wires at the

sensor and tie together for this measurement. Reconnect after measurement. d.

After measuring, remove ohmmeter

1794-TB3, -TB3T

Decade Box

Voltage Source

Set decade box to value determined in step 1, and connect in series with a preci

sion voltage source. b. Connect

Perform an of

to the input terminals of the particular channel you are calibrating.

fset and gain calibration as outlined later in this chapter

–15 16–33 34–51

A B C

Thermocouple

Sensor

A B C

Thermocouple

Sensor

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Disconnected

1794-6.5.7 – April 1997

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

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

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

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

1794-TB3, -TB3T

Remove the decade box and voltage source.

Reconnect the lead wires to the input terminals for this channel.

Repeat this procedure for the remaining channels.

Calibrating Your Module

–15

16–33

34–51

6–3

Thermocouple

Sensor

Manually Calibrating your Thermocouple/mV Input Module

You must calibrate the module in a FLEX I/O system. The module must communicate with the processor and a programming terminal. You can calibrate input channels in any order, or all at once.

Before calibrating your module, you must enter ladder logic into the processor memory, so that you can initiate BTWs to the module, and read inputs from the module.

Important: In order to allow the internal module temperature to

stabilize, energize the module for at least 40 minutes before calibrating.

Module calibration consists of:

• Applying a reference to the desired input(s).

• Sending a message to the module indicating which inputs to read

and what calibration step is being performed (offset).

The module stores this input data.

• Applying a second reference signal to the module, and sending a

second message indicating which inputs to read and what

calibration step is being performed (gain). The module computes new calibration values for the inputs. Once the calibration is complete, the module reports back status

information about the procedure. The following flow chart shows the procedure for calibration Important: Perform the offset calibration procedure first, then the

gain calibration procedure.

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Calibrating Your Module

Apply

reference signal for of

calibration to each channel to

be calibrated.

Flow Chart for Calibration Procedure

fset

Apply reference signal for gain

calibration to each channel to

be calibrated.

Exit

Set corresponding bits in the calibration mask and set cal

Hi/Lo = 0

BTW

Set cal–clk =1

BTW

BTR

Cal–done = 1

YES

Bad–cal = 0 Cal–range = 0

YES

Set cal–clk =0

Exit

Retain corresponding bits in the calibration mask and set

cal Hi/Lo = 1

BTW

Set cal–clk =1

BTW

BTR

Cal–done = 1

YES

Bad–cal = 0 Cal–range = 0

YES

Set cal–clk =0

and

cal hi/lo = 0

Legend:

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= block transfer write

BTW

BTR

= block transfer read

1794-6.5.7 – April 1997

BTW

BTR

Cal–done = 0

YES

BTW

BTR

Cal–done = 0

YES

Clear corresponding bits in

the calibration mask

BTW

Using

Thermocouple

a Precision V

Precision Voltage Source

oltage Source

Calibrating Your Module

Calibration Setups

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

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

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

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

These terminals not on 1794-TB2

1794-TB2,

Note: Use 1794-TB2 and -TB3 terminal base units for millivolt inputs only.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 150

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

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

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

CJC CJC

1794-TB3T

-TB3

CJC

0 –15 16–33 34–51

6–5

A B C

Note 2: CJC not required if using thermocouple for resistance only.

Wiring Connections for the Thermocouple Module

1794-TB2, -TB3 Terminal Base Units 1794-TB3T Terminal Base Unit

Channel

High Signal Terminal (+)

Low Signal

Terminal (–)

Shield

Return

High Signal

Terminal (+)

Low Signal

Terminal (–)

0 0 1 17 0 1 39 1 2 3 19 2 3 40 2 4 5 21 4 5 41 3 6 7 23 6 7 42 4 8 9 25 8 9 43 5 10 11 27 10 11 44 6 12 13 29 12 13 45 7 14 15 31 14 15 46

24V dc Common 16 thru 33 16, 17, 19, 21, 23, 25, 27, 29, 31 and 33

+24V dc power 1794-TB2 – 34 and 51; 1794-TB3 – 34 thru 51 34, 35, 50 and 51

Terminals 39 to 46 are chassis ground.

Terminals 36, 37, 38 and 47, 48, 49 are cold

junction compensator connections.

Shield

Return

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Calibrating Your Module

Read/Write Words for Calibration

Dec.

Bit

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

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Bad

Cal

Read Word 10 0 0 0 0 0

Write Word 0 8-Bit Calibration Mask

Cal

Done

Cal

Range

0 Diagnostic Status

Cal Clk

Cal hi Cal lo

Filter Cutoff FDF Data Type

PwrUpBad

Struct

Offset Calibration

Inputs can be calibrated one at a time or all at once. To calibrate the offsets for all inputs at once, proceed as follows:

1. Apply power to the module for 40 minutes before calibrating.

2. Connect 0.000V across each input channel. Connect all high

signal terminals together and attach to the positive lead from the precision voltage source. Connect all low signal terminals together and attach to the negative lead.

CJC over

CJC

Under

3. After the connections stabilize, use a block transfer write to set

the bit(s) in the calibration mask that correspond to the channel(s) you want to calibrate to 1. (Bits 08 through 15 in write word 0.)

4. Send another block transfer write to set the cal-clk bit (07 in write

word 0) to 1.

5. Monitor the cal-done bit (09 in read word 10). If the calibration is

successful, the cal-done bit will be set to 1. Verify that the bad-cal bit (10 in read word 10) and the cal-range bit (08 in read word 10) are not set (0).

6. Send another block transfer write to set the cal-clk bit (07 in write

word 0) to 0.

7. Monitor the cal-done bit (09 in read word 10). The cal-done bit

will be reset to 0.

8. If the calibration is successful, proceed to the gain calibration.

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Calibrating Your Module

6–7

Gain Calibration

After completing the offset calibration, proceed with the gain calibration.

1. Apply power to the module for 40 minutes before calibrating.

2. Connect 75.000mV across each input channel. Connect all high

signal terminals together and attach to the positive lead from the

precision voltage source. Connect all low signal terminals

together and attach to the negative lead.

3. After the connections stabilize, send a block transfer write to the

module to set the bit in the calibration mask that corresponds to

the channel to be calibrated to 1, and the hi/lo bit (bit 06 in write

word 0) to 1. (Set bits 08 through 15 in write word 0 if calibrating

all inputs at one time.)

4. Send another block transfer write to set the cal-clk bit (07 in write

word 0) to 1.

5. Monitor the cal-done bit (09 in read word 10). If the calibration is

successful, the cal-done bit will be set to 1. Verify that the bad-cal

bit (10 in read word 10) and the cal-range bit (08 in read word 10)

are not set (0).

6. Send another BTW to set the cal-clk bit (07 in write word 0) to 0.

7. Send another BTW to set the hi/lo bit (bit 06 in write word 0)

to 0.

8. Monitor the cal-done bit (09 in read word 10). The cal-done bit

will be reset to 0.

9. If individually calibrating channels, repeat steps 1 through 7 for

offset calibration on any additonal channels you want to calibrate.

10.Send a block transfer write to the module to clear all calibration

mask bits to 0.

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Calibrating Your Module

Calibrating Your Thermocouple/mV Module using DeviceNetManager Software (Cat. No. 1787-MGR)

The following procedure assumes that you are using DeviceNetManager software (cat. no. 1787-MGR) and have the thermocouple/mV module installed in a working system.

Offset Calibration

Inputs can be calibrated one at a time or all at once. To calibrate the offsets for all inputs at once, proceed as follows:

1. Connect 0.000V across each input channel. Connect all high

signal terminals together and attach to the positive lead from the precision voltage source. Connect all low signal terminals together and attach to the negative lead.

2. Apply power to the module for 45 minutes before calibrating.

3. Click on Configure for the slot containing the thermocouple

module.

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The following screen appears:

1794-6.5.7 – April 1997

Calibrating Your Module

4. Click on to get to the calibration screen.

5. Click on the channels you want to calibrate.

6–9

6. Click on the radio button

for offset calibration. Then click on

7. When calibration is complete, a notification will appear on the

calibration status line.

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Calibrating Your Module

Gain Calibration

Make sure that you have calibrated the offset for this channel before calibrating the gain.

1. Connect 75.000mV across each input channel. Connect all high

signal terminals together and attach to the positive lead from the precision voltage source. Connect all low signal terminals together and attach to the negative lead.

2. Click on the channels you want to calibrate.

3. Click on the radio button for gain calibration. Then click on

4. When calibration is complete, a notification will appear on the

calibration status line.

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6–1

The button populates the screen with the actual values appearing at the inputs. Note that there is an implied decimal

point to the left of the last 2 digits.. For example, channel 0 data value reads 7500. The actual reading is 75.00mV.

1Calibrating Your Module

After both offset and gain calibrations are successful, click on

You will be returned to the module configuration screen. Either save to the device (adapter), or save to a file by clicking on the appropriate button.

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Calibrating Your Module

If you attempt to close without saving your configuration information by clicking on the

button, you will be

prompted to save the changes.

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



Specifications1 – 1794-IT8 Thermocouple/mV Input Module

Number of Inputs 8 Channels Module Location Cat. No. 1794-TB2, -TB3 and -TB3T Terminal Base Units Nominal Input Voltage Ranges +76.5mV Supported Thermocouple Types Type B: 300 to 1800oC (572 to 3272oF)

Type C: 0 to 2315 Type E: –230 to 1000oC (–382 to 1832oF) Type J: –195 to 1200 Type K: –230 to 1372oC (–382 to 2502oF) Type N: –270 to 1300 Type R: –50 to 1768 Type S: –50 to 1768oC (–58 to 3214oF) Type T: –195 to 400

Type L: –175 to 800oC (–283 to 1472oF) Resolution 16 bits (2.384 microvolts typical) Accuracy with fixed digital filter

(at 24oC (+0.5oC)) Accuracy without fixed digital filter

C (+0.5oC))

(at 24 Data Format 16-bit 2’s complement or offset binary (unipolar) Normal Mode Noise Rejection –60db @ 60Hz Common Mode Rejection –115db @ 60Hz; –100db @ 50Hz Common Mode Input Range +10V Channel to Channel Isolation System Throughput 325ms (1 channel scanned), programmable to 28ms

Settling Time to 100% of final value Available at system throughput rate Open Circuit Detection Out of range reading (upscale) Open Thermocouple Detection Time Available at system throughput rate Overvoltage Capability 35V dc, 25V ac continuous @ 25oC

Channel Bandwidth 0 to 2.62Hz (–3db) default RFI Immunity Error of less than 1% of range at 10V/M

Input Offset Drift with Temperature +6 microvolts/oC maximum Gain Drift with Temperature 10ppm/oC maximum Overall Drift with Temperature 50ppm/oC of span (maximum) Cold Junction Compensation Range 0 to 70oC Cold Junction Compensator A-B Part Number 969424–01 Indicators 1 red/green power status indicator Flexbus Current 20mA Power Dissipation 3W maximum @ 31.2V dc

Specifications continued on next page.

0.025% Full Scale Range +0.5oC

0.05% Full Scale Range +0.5oC

+10V

2.6s (8 channels scanned), programmable to 224ms

250V peak transient

27 to 1000MHz

C (32 to 4199oF)

C (–319 to 2192oF)

C (–450 to 2372oF)

C (–58 to 3214oF)

C (–319 to 752oF)



emplate revised June 23, 1995

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A–2

Specifications

Specifications1 – 1794-IT8 Thermocouple/mV Input Module

Thermal Dissipation Maximum 10.2 BTU/hr @ 31.2V dc Keyswitch Position 3 General Specifications External dc Power

Cabling Thermocouples inputs

Dimensions Inches

Environmental Conditions

Agency Certification (when product or packaging is marked)

Installation Instructions Publication 1794-5.21

Specifications based on A/D filter first notch frequency of 10Hz

Supply Voltage Voltage Range

24V dc nominal

19.2 to 31.2V dc (includes 5% ac ripple)

19.2V dc for ambient temperatures less than 55 24V dc for ambient temperatures less than 55

31.2V dc for ambient temperatures less than 40 See derating curve.

Supply Current

150mA @ 24V dc Appropriate shielded thermocouple extension wire

Millivolt inputs

Belden 8761

1.8H x 3.7W x 2.1D

(Millimeters)

Operational Temperature Storage Temperature Relative Humidity

(45.7 x 94.0 x 53.3)

0 to 55oC (32 to 131oF) See derating curve. –40 to 85 5 to 95% noncondensing (operating) 5 to 80% noncondensing (nonoperating)

Shock Operating

Non-operating

Vibration

30 g peak acceleration, 11(+ 50 g peak acceleration, 11(+ Tested 5 g @ 10–500Hz per IEC 68-2-6

• CSA certified

• CSA Class I, Division 2

Groups A, B, C, D certified

• UL listed

• CE marked for all applicable directives

Use 1794-TB2 or -TB3 terminal base unit for millivolt inputs only thermocouple inputs. Refer to the thermocouple manufacturer for the correct extension wire.

. Y

ou must use a 1794-TB3T terminal base unit when using

C (–40 to 185oF)

1)ms pulse width

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Specifications

A–3

Derating Curve

The area within the curve represents the safe operating range for the module under various conditions of user supplied 24V dc supply voltages and ambient temperatures.

= Safe operating area

User Applied 24V dc Supply versus Ambient Temperature

31.2

24.0

User Applied 24V dc Supply

19.2

Resolution Curves for Thermocouples

C40

Ambient Temperature

C50oC55oC

102.4

184.3

89.60

161.3

76.80

138.2

64.00

115.2

51.20

92.16

38.40

69.12

25.60

46.08

12.80

23.04

Resolution

25.60

46.08

22.40

40.32

19.20

34.56

16.00

28.80

12.80

23.04

9.60

17.28

6.40

11.52

3.20

5.76

C F

6.40

11.52

5.60

10.08

4.80

8.64

4.00

7.20

3.20

5.76

2.40

4.32

1.60

2.88

0.80

1.44

Type B Thermocouple

10–100Hz250Hz500Hz1000Hz

0.80

1.44

0.70

1.26

0.60

1.08

0.50

0.90

0.40

0.72

0.30

0.54

0.20

0.36

0.10

0.18 0

–300 –508

–150 –238

150 302

300 572

450 842

600

1112

Temperature

750

1382

900

1652

1050 1922

1200 2192

1350

2462

1500

2732

1650 3002

1800

3272

emplate revised June 23, 1995

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A–4

Specifications

Type E Thermocouple

64.00

115.2

51.20

92.16

38.40

69.12

25.60

46.08

12.80

23.04

Resolution

16.00

28.80

12.80

23.04

9.60

17.28

12.80

11.52

6.40

5.76

4.00

7.20

3.20

5.76

2.40

4.32

1.60

2.88

0.80

1.44

10–100Hz250Hz500Hz1000Hz

0.50

0.90

0.40

0.72

0.30

0.54

0.20

0.36

0.10

0.18

–300 –508

–150 –238

150

302

300 572

Temperature

450 842

600

1112

C F

750

1382

900

1652

1050 1922

1200 2192

Type C Thermocouple

32.00

57.60

25.60

46.08

19.20

34.56

12.80

23.04

6.400

11.52

Resolution

8.00

14.4

6.40

11.52

4.80

8.64

3.20

5.76

1.60

2.88

2.00

3.60

1.60

2.88

1.20

2.16

0.80

1.44

0.40

0.72

10–100Hz250Hz500Hz1000Hz

0.25

0.45

0.20

0.36

0.15

0.27

0.10

0.18

0.05

0.09

–300 –508

300 572

600

1112

900

1652

Temperature

1200 2192

C F

1500

2732

1800

3272

2100

3812

2400 4352

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Type J Thermocouple

Specifications

A–5

17.92

32.25

15.36

27.65

12.80

23.04

10.24

18.43

7.680

13.82

5.120

9.216

2.560

4.608

Resolution

4.480

8.064

3.840

6.912

3.200

5.760

2.560

4.608

1.920

3.456

1.280

2.304

0.640

1.152

1.120

2.016

0.960

1.728

0.800

1.440

0.640

1.152

0.480

0.864

0.320

0.576

0.160

0.288

10–100Hz250Hz500Hz1000Hz

0.140

0.252

0.120

0.216

0.100

0.180

0.080

0.144

0.060

0.108

0.040

0.072

0.020

0.036 0

–300 –508

–150

–238

150

302

Type K Thermocouple

300 572

Temperature

450 842

C F

600

1112

750 1382

900

1652

1050 1922

1200 2192

Resolution

128.0

230.4

102.4

184.3

76.80

138.2

51.20

92.16

25.60

46.08

32.00

57.60

25.60

46.08

19.20

34.56

12.80

23.04

6.400

11.52

8.000

14.40

6.400

11.52

4.800

8.640

3.200

5.760

1.600

2.880

10–100Hz250Hz500Hz1000Hz

1.000

1.800

0.800

1.440

0.600

1.080

0.400

0.720

0.200

0.360

–300 –508

–150 –238

900

150

302

300 572

450 842

Temperature

600

1112

750 1382

C F

1652

1050 1922

1200 2192

1350 2462

1500

2732

emplate revised June 23, 1995

Publication

1794-6.5.7 – March 1997

A–6

Specifications

Type R Thermocouple

102.4

184.3

76.80

138.2

51.20

92.16

25.60

46.08

Resolution

25.60

46.08

19.20

34.56

12.80

23.04

6.40

11.52

C F

6.40

11.52

4.80

8.64

3.20

5.76

1.60

2.88

10–100Hz250Hz500Hz1000Hz

0.80

1.44

0.60

1.08

0.40

0.72

0.20

0.36

–300 –508

–150 –238

150 302

300

572

450 842

600

1112

Temperature

750

1382

900

1652

1050 1922

1200 2192

1350

2462

1500

2732

1650

3002

1800

3272

Type S Thermocouple

76.80

138.2

64.00

115.2

51.20

92.16

38.40

69.12

25.60

46.08

12.80

23.04

Resolution

19.20

34.56

16.00

28.80

12.80

23.04

9.60

17.28

6.40

11.52

3.20

5.76

C F

4.80

8.64

4.00

7.20

3.20

5.76

2.40

4.32

1.60

2.88

0.80

1.44

10–100Hz250Hz500Hz1000Hz

0.60

1.08

0.50

0.90

0.40

0.72

0.30

0.54

0.20

0.36

0.10

0.18

–300 –508

–150 –238

150 302

300

572

450 842

600

1112

Temperature

750 1382

900

1652

1050 1922

1200 2192

1350

2462

1500

2732

1650

3002

1800

3272

Publication

1794-6.5.7 – March 1997

Type T Thermocouple

Specifications

A–7

102.4

184.3

89.60

161.3

76.80

138.2

64.00

115.2

51.20

92.16

38.40

69.12

25.60

46.08

12.80

23.04

Resolution

25.60

46.08

22.40

40.32

19.20

34.56

16.00

28.80

12.80

23.04

9.60

17.28

6.40

11.52

3.20

5.76

6.40

11.52

5.60

10.08

4.80

8.64

4.00

7.20

3.20

5.76

2.40

4.32

1.60

2.88

0.80

1.44

10–100Hz250Hz500Hz1000Hz

0.80

1.44

0.70

1.26

0.60

1.08

0.50

0.90

0.40

0.72

0.30

0.54

0.20

0.36

0.10

0.18 0

–300 –508

–150 –238

150 302

Temperature

300 572

450 842

600

1112

Type N Thermocouple

128.0

230.4

102.4

184.3

76.80

138.2

51.20

92.16

25.60

46.08

Resolution

32.00

57.60

25.60

46.08

19.20

34.56

12.80

23.04

6.40

11.52

C F

8.00

14.40

6.40

11.52

4.80

8.64

3.20

5.76

1.60

2.88

10–100Hz250Hz500Hz1000Hz

1.00

1.80

0.80

1.44

0.60

1.08

0.40

0.72

0.20

0.36

–300 –508

–150 –238

150

302

300 572

Temperature

450 842

600

1112

C F

750 1382

900

1652

1050 1922

1200 2192

1350

2462

emplate revised June 23, 1995

Publication

1794-6.5.7 – March 1997

A–8

Specifications

Type L Thermocouple

11.71

53.0

8.51

47.3

5.31

41.5

2.13

35.8

1.46

34.6

1.06

33.9

0.66

33.1

0.26

32.4

10–100Hz250Hz500Hz1000Hz

0.18

32.3

0.13

32.2

0.08

32.1

0.03

32.0

–200 –328

–150 –238

–100 –148

03250

122

100

200

212

392

Temperature

Resolution

93.69

200.6

68.09

154.5

42.49

108.4

17.04

62.6

Worst Case Accuracy for the Thermocouple/mV Module

300

572

400

752

500

932

600

1112

700

1292

800

1472

Input Type

B +3.70oC +6.66oF +0.710oC/oC +0.710oF/oF E +0.51oC +0.92oF +0.104oC/oC +0.104oF/oF J +0.68oC +1.22oF +0.130oC/oC +0.130oF/oF K +1.00oC +1.80oF +0.186oC/oC +0.186oF/oF R +3.16oC +5.69oF +0.601oC/oC +0.601oF/oF S +3.70oC +6.67oF +0.651oC/oC +0.651oF/oF T +0.67oC +1.21oF +0.174oC/oC +0.174oF/oF N +1.07oC +1.93oF +0.223oC/oC +0.223oF/oF C +3.40oC +6.12oF +0.434oC/oC +0.434oF/oF L +0.58oC +1.35oF +0.119oC/oC +0.119oF/oF

Accuracy

@ 25

+39µV +39µV +7.812µV/oC +14.06µV/oF

Accuracy

@ 77

Temperature Drift

C) (32–oF)

(0–60

Publication

1794-6.5.7 – March 1997

Error Due to Open Circuit Current Through Loop Resistance

Input Type Error per Ohm of Loop Resistance

B 0.091oC 0.164oF E 0.013oC 0.023oF

J 0.016oC 0.029oF K 0.024oC 0.043oF R 0.076oC 0.137oF S 0.083oC 0.149oF T 0.022oC 0.040oF N 0.028oC 0.050oF C 0.055oC 0.099oF

L 0.015oC 0.028oF

0.417µV (2.4Ω = 1 LSB of error)

Worst Case Repeatability for the Thermocouple/mV Input Module

Specifications

A–9

Input Type

Repeatability with Filter

C) (oF)

Repeatability without Filter

C) (oF)

(

B +1.00oC +1.80oF +2.00oC/oC +3.60oF/oF E +0.16oC +0.29oF +0.32oC/oC +0.58oF/oF

J +0.20oC +0.36oF +0.40oC/oC +0.72oF/oF K +0.28oC +0.50oF +0.56oC/oC +1.00oF/oF R +1.10oC +1.98oF +2.20oC/oC +3.96oF/oF S +1.00oC +1.80oF +2.00oC/oC +3.60oF/oF

T +0.27oC +0.54oF +0.54oC/oC +1.08oF/oF N +0.34oC +0.61oF +0.68oC/oC +01.22oF/oF C +0.13oC +0.23oF +0.26oC/oC +0.46oF/oF

L +0.19oC +0.30oF +0.37oC/oC +0.62oF/oF

Note:

The filter is enabled by setting bit 02 in write word 0.

+12µV +12µV +24µV/oC +24µV/oF

emplate revised June 23, 1995

Publication

1794-6.5.7 – March 1997

A–10

Specifications

Publication

1794-6.5.7 – March 1997

General

Appendix

Thermocouple Restrictions (Extracted from NBS Monograph 125 (IPTS-68))

Following are some restrictions extracted from NBS Monograph 125 (IPTS–68) issued March 1974 on thermocouples B, E, J, K, R, S and T:

B (Platinum – 30% Rhodium vs Platinum – 6% Rhodium) Type Thermocouples

“The ASTM manual STP 470 [1970] indicates the following restrictions on the use of B type thermocouples at high temperatures: They should not be used in reducing atmospheres, nor in those containing metallic or nonmetallic vapors, unless suitably protected wiht nonmetallic protecting tubes. They should never be inserted directly into a metallic primary tube.”

“At temperatures below 450C the Seebeck coefficient of Type B thermocouples becomes quite small and is almost negligible in the normal room temperature range. Consequently, in most applications the reference junction temperature of the thermocouple does not need to be controlled or even known, as long as it is between 0 and 50C.”

Studies have shown that “a 0.1 percent change in the Rhodium content of the Pt–30% Rh thermoelement produces a corresponding change in the thermocouple voltage of about 15uV (i.e. 1.3C) at 1500C. In contrast a change of only .01% in the Rhodium content of Pt–6% Rh thermoelement also produces a voltage change of about 15uV (1.3C) at this temperature.”

“The thermoelectric voltages of Type B thermocouples is sensitive to their history of annealing, heat treatment and quenching. Calibration of Type B wires above 1600C is undesirable in most circumstances.”

“ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for Type B commercial thermocouples be + 1/2 percent between 871 and 1705C. Limits of error are not specified for Type B thermocouples below 871C. The recommended upper temperature limit for protected thermocouples, 1705C, applies to AWG 24 (0.5mm) wire.”

Publication

1794-6.5.7

Thermocouple Restrictions B–2

E (Nickel–Chromium vs Copper–Nickel <Constantan*>) Type Thermocouple

“Type E thermocouples are recommended by the ASTM Manual [1970] for use in the temperature range from –250 to 871C in oxidizing or inert atmospheres. The negative thermoelement is subject to deterioration above about 871C, but the thermocouple may be used up to 1000C for short periods.”

“The ASTM Manual [1970] indicates the following restrictions .. at high temperatures. They should not be used in sulfurous, reducing or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes. They should not be used in vacuum (at high temperatures) for extended times, because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration. They should also not be used in atmospheres that promote ”green–rot” corrosion (those with low, but not negligible, oxygen content).”

“The negative thermoelement, a copper–nickel alloy, is subject to composition changes under thermal neutron irradiation since the copper is converted to nickel and zinc.”

“ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for the Type E commercial thermocouples be +/–1.7C between 0 and 316C and +/–1/2 percent between 316 and 871C. Limits of error are not specified for Type E thermocouples below 0C. Type E thermocouples can also be supplied to meet special limits of error, which are less than the standard limits of error given above: +/–1.25C between 0 and 316C and +/–3/8 percent between 316 and 871C. The recommended upper temperature limit for protected thermocouples, 871C, applies to AWG 8 (3.3mm) wire. For smaller wires the recommended upper temperature decreases to 649C for AWG 14 (1.6mm), 538C for AWG 20 (.8mm) and 427C for AWG 24 or 28 (0.5 or 0.3mm).

J (Iron vs Copper–Nickel <Constantan*>) Type Thermocouple

The J thermocouple “is the least suitable for accurate thermometry because there are significant nonlinear deviations in the

thermoelectric output from different manufacturers. ... The total and

specific types of impurities that occur in commercial iron change with time, location of primary ores, and methods of smelting.”

Publication

1794-6.5.7

Thermocouple Restrictions B–3

“Type J thermocouples are recommended by the ASTM [1970] for use in the temperature range from 0 to 760C in vacuum, oxidizing, reducing or inert atmospheres. If used for extended times above 500C, heavy gage wires are recommended because the oxidation rate is rapid at elevated temperatures.”

“They should not be used in sulfurous atmospheres above 500C. Because of potential rusting and embrittlement, they are not recommended for subzero temperatures. They should not be cycled above 760C even for a short time if accurate readings below 760C are desired at a later time.”

“The negative thermoelement, a copper–nickel alloy, is subject to substantial composition changes under thermal neutron irradiation, since copper is converted to nickel and zinc.”

“Commercial iron undergoes a magnetic transformation near 769C and <an alpha – gamma> crystal transformation near 910C. Both of these transformations, especially the latter, seriously affect the thermoelectric properties of iron, and therefore, the Type J thermocouples. If Type J thermocouples are taken to high temperatures, especially above 900C, they will lose accuracy of their calibration when they are recycled to lower temperatures.”

“ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for Type J commercial thermocouples be +/–2.2C between 0 and 277C and +/–3/4 percent between 277 and 760C. Limits of error are not specified for Type J thermocouples below 0C or above 760C. Type J thermocouples can also be supplied to meet special limits of error, which are equal to one half the limits given above. The recommended upper temperature limit for protected thermocouples, 760C, applies to AWG 8 (3.3mm) wire. For smaller wires the recommended upper temperature decrease to 593C for AWG 14 (1.6mm), and 371C for AWG 24 or 28 (0.5 or 0.3mm).

It should be noted that the Constantan element of T

with the Constantan element of Types T or N due to the different ratio of copper and nickel in each.

ype J thermoelements is NOT interchangeable

Publication

1794-6.5.7

Thermocouple Restrictions B–4

K (Nickel–Chromium vs Nickel–Aluminum) Type Thermocouple

“This type is more resistant to oxidation at elevated temperatures than the Types E, J or T thermocouples and consequently it finds wide application at temperatures above 500C.”

“Type K thermocouples may be used at” liquid hydrogen “temperatures. However, their Seebeck coefficient (about 4uV/K at 20K) is only about one–half of that of Type E thermocouples. Furthermore, the thermoelectric homogeneity of KN thermoelements is generally not quite as good as that of EN thermoelements. Both the KP and the KN thermoelements do have a relatively low thermal conductivity and good resistance to corrosion in moist atmospheres at low temperatures.”

“Type K thermocouples are recommended by the ASTM [1970] for continuous use at temperatures within the range –250 to 1260C in oxidizing or inert atmospheres. Both the KP and the KN thermoelements are subject to oxidation when used in air above about 850C, but even so, Type K thermocouples may be used at temperatures up to about 1350C for short periods with only small changes in calibration.”

“They should not be used in sulfurous, reducing, or alternately reducing and oxidizing atmospheres unless suitably protected with protecting tubes. They should not be used in vacuum (at high temperatures) for extended times because the Chromium in the positive thermoelement vaporizes out of solution and alters the calibration. They should also not be used in atmospheres that promote ”green–rot” corrosion (those with low, but not negligible, oxygen content).”

“ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for Type K commercial thermocouples be +/–2.2C between 0 and 277C and +/–3/4 percent between 277 and 1260C. Limits of error are not specified for the Type K thermocouples below 0C. Type K thermocouples can also be supplied to meet special limits of error, which are equal to one half the standard limits of error given above. The recommended upper temperature limit for protected Type K thermocouples, 1260C, applies for AWG 8 (3.3mm) wire. For smaller wires it decreases to 1093C for AWG 14 (1.6mm), 982C for AWG 20 (0.8mm), and 871C for AWG 24 or 28 (0.5 or 0.3mm).”

Publication

1794-6.5.7

Thermocouple Restrictions B–5

R (Platinum–13% Rhodium vs Platinum) and S (Platinum–10% Rhodium vs Platinum) Type Thermocouples

“The ASTM manual STP 470 [1970] indicates the following restrictions on the use of S {and R} type thermocouples at high temperatures: They should not be used in reducing atmospheres, nor in those containing metallic vapor (such as lead or zinc), nonmetallic vapors (such as arsenic, phosphorous or sulfur) or easily reduced oxides, unless suitably protected with nonmetallic protecting tubes. They should never be inserted directly into a metallic primary tube.”

“The positive thermoelement, platinum–10% rhodium {13% rhodium for R}, is unstable in a thermal neutron flux because the rhodium converts to palladium. The negative thermoelement, pure platinum, is relatively stable to neutron transmutation. However, fast neutron bombardment will cause physical damage, which will change the thermoelectric voltage unless it is annealed out.”

“The thermoelectric voltages of platinum based thermocouples are sensitive to their heat treatments. In particular, quenching from high temperatures should be avoided.”

“ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for Type S {and R} commercial thermocouples be +/–1.4C between 0 and 538C and +/–1/4% between 538 and 1482C. Limits of error are not specified for Type S {or R} thermocouples below 0C. The recommended upper temperature limit for continuous use of protected thermocouples, 1482C, applies to AWG 24 (0.5mm) wire.

T (Copper vs Copper–Nickel <Constantan*>) Type Thermocouple

“The homogeneity of most Type TP and TN (or EN) thermoelements is reasonably good. However, the Seebeck coefficient of Type T thermocouples is moderately small at subzero temperatures (about

5.6uV/K at 20K), being roughly two–thirds that of Type E thermocouples. This, together with the high thermal conductivity of Type TP thermoelements, is the major reason why Type T thermocouples are less suitable for use in the subzero range than Type E thermocouples.”

Publication

1794-6.5.7

Thermocouple Restrictions B–6

“Type T thermocouples are recommended by the ASTM [1970] for use in the temperature range from –184 to 371C in vacuum or in oxidizing, reducing or inert atmospheres. The recommended upper temperature limit for continuous service of protected Type T thermocouples is set at 371C for AWG 14 (1.6mm) thermoelements, since Type TP thermoelements oxidize rapidly above this temperature. However, the thermoelectric properties of Type TP thermoelements are apparently not grossly affected by oxidation since Roeser and Dahl [1938] observed negligible changes in the thermoelectric voltage of Nos. 12, 18, and 22 AWG Type TP thermoelements after heating for 30 hours in air at 500C. At this temperature the Type TN thermoelements have good resistance to oxidation and exhibit only small changes in thermal emf with long exposure in air, as shown by the studies of Dahl [1941].” ... “Operation of Type T thermocouples in hydrogen atmospheres at temperatures above about 370C is not recommended since severe embrittlement of the Type TP thermoelements may occur.”

“Type T thermoelements are not well suited for use in nuclear environments, since both thermoelements are subject to significant changes in composition under thermal neutron irradiation. The copper in the thermoelement is converted to nickel and zinc.”

“Because of the high thermal conductivity of Type TP thermoelements, special care should be exercised in the use of the thermocouples to insure that both the measuring and reference junctions assume the desired temperatures.”

ASTM Standard E230–72 in the Annual Book of ASTM Standards [1972] specifies that the standard limits of error for Type T commercial thermocouples be +/–2 percent between –101 and –59C, +/–.8C between –59 and 93C and +/–3/4 percent between 93 and 371C. Type T thermocouples can also be supplied to meet special limits of error, which are equal to one half the standard limits of error given above (plus a limit of error of +/–1 percent is specified between –184 and –59C). The recommended upper temperature limit for protected Type T thermocouples, 371C, applies to AWG 14 (1.6mm) wire. For smaller wires it decreases to 260C for AWG 20 (0.8mm) and 240C for AWG 24 or 28 (0.5 or 0.3mm).

Use this template for your appendices. If it were not for the different running head, this would be your chapter 4 document.

Publication

1794-6.5.7

Index

Numbers

1794-TB3

example, thermocouple

connection, 2–7

accuracy adapter input status word, 5–1

, worst case, A–7

bit/word description, thermocouple module,

1794-IT8, 4–5, 5–4

block transfer

read, 1–2

write, 1–2 block transfer programming, 3–1 block transfer read, 4–4

1794-IT8, 4–4, 5–3 block transfer write

1794-IT8, 4–5, 5–4

configuration block, 1794-IT8, 4–5, 5–4

input range selection, 4–2

connecting wiring, 2–5, 6–6 considerations, pre–installation, 2–1 curent draw curve

derating, A–2 supply voltage vs. ambient temperature,

curves, resolution, A–3

, through base units, 2–2

A–2

daisy–chaining wiring, 2–3 default values, 5–7 derating curve, A–2 DeviceNetManager DeviceNetManager software, 6–9

, software, 5–1

example

thermocouple/1794-TB3, 2–7 thermocouple/1794-TB3T

, 2–7

calibration

gain, 6–8

manual, 6–4

fset, 6–7 periodic, 6–1 preparation, 6–4 setups, 6–6 tools, 6–2 types of, 6–1 using decade box, 6–6 using DeviceNetManager using resistors, 6–6

calibration flow chart, 6–5 calibration words, 6–7 cold junction compensators, 1–3 cold junction connection wiring, 2–6 communication, between module and

adapter

, 1–2 compatible terminal bases, 2–5 configurable features, 4–1 connecting CJC, 2–6

, 6–9

features, of the module, 1–3 first notch filter flow chart, calibration, 6–5

, 4–3

gain calibration, 6–8

using DeviceNetManager

I/O module fault, 5–2 indicators

states, 2–8

status, 2–8 input ranges, 4–2 input scaling, 4–2 input status word, 5–2 installation, module, 2–4

, 6–1

Publication

1794-6.5.7

IndexI–2

keyswitch

positions, 2–4

manual calibration, 6–4 mapping, 1794-IT8, 4–4, 5–3 module, shipping state, 6–1 module fault, 5–2 module features, 1–3 module installation, 2–4

fset calibration, 6–7

using DeviceNetManager open circuit error optimal defaults, 5–7

, A–8

, 6–9

PLC–2 programming, 3–4 polled I/O, structure, 5–1 power defaults, 5–7 preparing for calibration, 6–4 programming example

PLC–3, 3–2

PLC–5, 3–3

repeatability resolution curves, A–3

type B thermocouple, A–3 type C thermocouple, A–4 type E thermocouple, A–3 type J thermocouple, A–4 type K thermocouple, A–5 type N thermocouple, A–7 type R thermocouple, A–5 type S thermocouple, A–6 type T thermocouple, A–6

, worst case, A–8

sample program, 3–4 scaling, 4–2 software, DeviceNetManager specifications, thermocouple, A–1 status indicators, 2–8 system throughput, 5–3

, 5–1

terminal bases, compatible, 2–5 thermocouple input mapping, 1794-IT8,

4–4, 5–3 thermocouple/1794-TB3T example, 2–7 throughput, normal mode, 4–3

Publication

1794-6.5.7

range, selecting, 4–2 read/write words, for calibration, 6–7 removing and replacing, under power

(RIUP), 2–4

wiring

connections, 6–6 methods of, 2–3 to terminal bases, 2–1

wiring connections, 2–5

1794-IT8, 2–6, 6–6

Pub.

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Publication 1794-6.5.7 – April 1997

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publication 1794-6.5.7 – March 1996

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1794-6.5.7 – April 1997

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Rockwell Automation 1794-IT8, D17946.5.7 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

New Information

Updated Information

Table of Contents

Preface Objectives

Audience

Vocabulary

What This Manual Contains

Conventions

For Additional Information

Summary

Chapter Objectives

The FLEX I/O System

How FLEX I/O Analog Modules Communicate with Programmable Controllers

Features of your Modules

Chapter Summary

Before You Install Your Input Module

European Union Directive Compliance

Power Requirements

Installing the Module

Connecting Wiring for the Thermocouple/mV Module

Module Indicators

Chapter Summary

Chapter Objectives

Block Transfer Programming

Sample programs for FLEX I/O Analog Modules

Chapter Summary

Chapter Objectives

Configuring Your Thermocouple/mV Module

Range Selection

Input Scaling

Hardware First Notch Filter

Reading Data From Your Module

Mapping Data for the Analog Modules

Chapter Summary

About DeviceNet Manager

System Throughput

Mapping Data into the Image Table

Defaults

Chapter Objective

General Information

Tools and Equipment

Removing Lead Wire or Thermocouple Extension Wire Resistance

Manually Calibrating your Thermocouple/mV Input Module

Calibrating Your Thermocouple/mV Module using DeviceNetManager Software (Cat. No. 1787-MGR)

Derating Curve

Resolution Curves for Thermocouples

Worst Case Accuracy for the Thermocouple/mV Module

Error Due to Open Circuit Current Through Loop Resistance

Worst Case Repeatability for the Thermocouple/mV Input Module

General

Index

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