Spectrum Controls 1794 IRT8I RTD/Thermocouple Module User's Manual

User's   Manual   Pub.

  0300242 ‐ 01   Rev.

  A

1794 Isolated

RTD/Thermocouple Module

Catalog Number: 1794sc-IRT8I

ii Flex™ IO Isolated RTD/Thermocouple Module

Important Notes

1.

Please read all the information in this owner’s guide before installing the product.

2.

The information in this owner's guide applies to hardware Series A and firmware version 1.0 or later.

3.

This guide assumes that the reader has a full working knowledge of the relevant processor.

Notice

The products and services described in this owner's guide are useful in a wide variety of applications. Therefore, the user and others responsible for applying the products and services described herein are responsible for determining their acceptability for each application. While efforts have been made to provide accurate information within this owner's guide, Spectrum Controls assumes no responsibility for the accuracy, completeness, or usefulness of the information herein.

Under no circumstances will Spectrum Controls be responsible or liable for any damages or losses, including indirect or consequential damages or losses, arising out of either the use of any information within this owner's guide or the use of any product or service referenced herein.

No patent liability is assumed by Spectrum Controls with respect to the use of any of the information, products, circuits, programming, or services referenced herein.

The information in this owner's guide is subject to change without notice.

Limited Warranty

Spectrum Controls warrants that its products are free from defects in material and workmanship under normal use and service, as described in Spectrum Controls literature covering this product, for a period of 1 year. The obligations of Spectrum Controls under this warranty are limited to replacing or repairing, at its option, at its factory or facility, any product which shall, in the applicable period after shipment, be returned to the

Spectrum Controls facility, transportation charges prepaid, and which after examination is determined, to the satisfaction of Spectrum Controls, to be thus defective.

This warranty shall not apply to any such equipment which shall have been repaired or altered except by Spectrum Controls or which shall have been subject to misuse, neglect, or accident. In no case shall the liability of Spectrum Controls exceed the purchase price.

The aforementioned provisions do not extend the original warranty period of any product which has either been repaired or replaced by Spectrum Controls.

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iii

Table of Contents

IMPORTANT   NOTES   ............................................................................................................................................

  II

 

NOTICE   ..............................................................................................................................................................

  II

 

LIMITED   WARRANTY   ..........................................................................................................................................

  II

 

CHAPTER   1   MODULE   OVERVIEW   .....................................................................................................................

  1 ‐ 1

 

S

ECTION  

1.1

 

G

ENERAL  

D

ESCRIPTION

  ..............................................................................................................................

  1 ‐ 1

 

S

ECTION  

1.2

 

I

NPUT  

T

YPES   AND  

R

ANGES

  .........................................................................................................................

  1 ‐ 1

 

S

ECTION  

1.3

 

D

ATA  

F

ORMATS

  .......................................................................................................................................

  1 ‐ 2

 

S

ECTION  

1.4

 

F

ILTER   

F

REQUENCIES

  ................................................................................................................................

  1 ‐ 2

 

S

ECTION  

1.5

 

H

ARDWARE   

F

EATURES

  ..............................................................................................................................

  1 ‐ 2

 

S

ECTION  

1.6

 

S

YSTEM  

O

VERVIEW

  ...................................................................................................................................

  1 ‐ 3

 

1.6.1

  Module   Power ‐ up   .....................................................................................................................................

  1 ‐ 3

 

S

ECTION  

1.7

 

M

ODULE  

O

PERATION

  ................................................................................................................................

  1 ‐ 3

 

CHAPTER   2   INSTALLATION   AND   WIRING   ..........................................................................................................

  2 ‐ 1

 

S

ECTION  

2.1

 

C

OMPLIANCE   TO  

E

UROPEAN  

U

NION  

D

IRECTIVES

  .............................................................................................

  2 ‐ 1

 

2.1.1

  EMC   Directive   ............................................................................................................................................

  2 ‐ 1

 

2.1.2

  Low   Voltage   Directive   ...............................................................................................................................

  2 ‐ 1

 

S

ECTION  

2.2

 

G

ENERAL  

C

ONSIDERATIONS

  ........................................................................................................................

  2 ‐ 2

 

2.2.1

  Hazardous   Location   Considerations   ..........................................................................................................

  2 ‐ 2

 

2.2.2

  Prevent   Electrostatic   Discharge   ................................................................................................................

  2 ‐ 2

 

2.2.3

  Remove   Power   ..........................................................................................................................................

  2 ‐ 3

 

2.2.4

  Selecting   a   Location   ..................................................................................................................................

  2 ‐ 3

 

S

ECTION  

2.3

 

P

OWER   

R

EQUIREMENTS

  ............................................................................................................................

  2 ‐ 3

 

2.3.1

  Wiring   the   Terminal   Base   Units   (1794 ‐ TB3G   shown)   ................................................................................

  2 ‐ 4

 

S

ECTION  

2.4

 

I

NSTALLING   THE  

M

ODULE

  ...........................................................................................................................

  2 ‐ 5

 

2.4.1

  Mounting   the   Terminal   Base   Unit   on   a   DIN   Rail   .......................................................................................

  2 ‐ 5

 

2.4.2

  Panel/Wall   Mounting   ...............................................................................................................................

  2 ‐ 7

 

2.4.3

  Mounting   the   IRT8I   Module   on   the   Terminal   Base   Unit   ...........................................................................

  2 ‐ 9

 

S

ECTION  

2.5

 

F

IELD  

W

IRING  

C

ONNECTIONS

  ....................................................................................................................

  2 ‐ 10

 

2.5.1

  Field   Wiring   using   a   1794 ‐ TB3G   and   TB3GS   Terminal   Base   ....................................................................

  2 ‐ 10

 

S

ECTION  

2.6

 

M

ODULE  

I

NDICATORS

  ..............................................................................................................................

  2 ‐ 15

 

CHAPTER   3   CONFIGURING   THE   1794SC ‐ IRT8I   USING   RSLOGIX   5000   ..................................................................

  3 ‐ 1

 

S

ECTION  

3.1

 

T

HINGS  

Y

OU  

S

HOULD  

K

NOW

  ......................................................................................................................

  3 ‐ 1

 

S

ECTION  

3.2

 

M

ODULE  

M

EMORY  

M

AP

  ...........................................................................................................................

  3 ‐ 1

 

S

ECTION  

3.3

 

C

ONFIGURE  

G

ENERIC  

P

ROFILE

  .....................................................................................................................

  3 ‐ 2

 

3.3.1

  Add   a   Local   Ethernet   Bridge   Module   ........................................................................................................

  3 ‐ 3

 

3.3.2

  Add   a   Remote   Ethernet   Flex   Adapter   ........................................................................................................

  3 ‐ 4

 

3.3.3

  Add   the   Generic   Flex   Module   ....................................................................................................................

  3 ‐ 6

 

S

ECTION  

3.4

 

M

ODULE   

C

ONFIGURATION

.........................................................................................................................

  3 ‐ 7

 

3.4.1

  Fault   Mode   [Word   0   (Bits   2,3,4,5,10,11,12,13)]   .......................................................................................

  3 ‐ 9

 

3.4.2

  Input   Type   [Words   1   –   8   (Bits   0   to   4)]   .......................................................................................................

  3 ‐ 9

 

3.4.3

  Input   Filter   [Words   1   –   8   (Bits   5   to   7)   ......................................................................................................

  3 ‐ 10

 

3.4.4

  Data   Format   [Words   1   –   8   (Bits   8   to   10)   .................................................................................................

  3 ‐ 10

 

3.4.5

  Open   Circuit   Mode   [Words   1   –   8   (Bits   12   &   13)]   .....................................................................................

  3 ‐ 12

 

3.4.6

  Disable   CJC   [Words   1   –   8   (Bit   14)]   ...........................................................................................................

  3 ‐ 12

 

3.4.7

  Temperature   Units   [Words   1   –   8   (Bit   15)]   ...............................................................................................

  3 ‐ 12

 

3.4.8

  Low   Alarm   Threshold   [Words   9,12,15,18,21,24,27,30]   ..........................................................................

  3 ‐ 12

 

3.4.9

  High   Alarm   Threshold   [Words   10,13,16,19,22,25,28,31]   .......................................................................

  3 ‐ 12

 

3.4.10

  User   Alarm   Deadband   [Words   11,14,17,20,23,26,29,32]   .....................................................................

  3 ‐ 12

 

S

ECTION  

3.5

 

R

EAD  

I

NPUT  

&

 

S

TATUS  

D

ATA

  ....................................................................................................................

  3 ‐ 13

 

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iv Flex™ IO Isolated RTD/Thermocouple Module

3.5.1

  Input   Data   [Words   0   to   7]   .......................................................................................................................

  3 ‐ 15

 

3.5.2

  UnderRange   Alarms   [Word   8   (Bits   0   to   7)]   .............................................................................................

  3 ‐ 15

 

3.5.3

  OverRange   Alarm   [Word   8   (Bits   8   to   15)]   ...............................................................................................

  3 ‐ 15

 

3.5.4

  User   Low   Alarm   [Word   9   (Bits   0   to   7)]   ....................................................................................................

  3 ‐ 15

 

3.5.5

  User   High   Alarm   [Word   9   (Bits   8   to   15)]   .................................................................................................

  3 ‐ 15

 

3.5.6

  Open   Circuit   Alarm   [Word   10   (Bits   0   to   7)]   .............................................................................................

  3 ‐ 15

 

3.5.7

  CJC   Alarm   [Word   10   (Bits   8   &   9)]   ............................................................................................................

  3 ‐ 16

 

3.5.8

  Diagnostics   [Word   11   (Bits   0   to   7)]   .........................................................................................................

  3 ‐ 16

 

APPENDIX   A   MODULE   SPECIFICATIONS   ............................................................................................................

  A ‐ 1

 

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PREFACE  

v

Who Should

Use This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradley I/O and/or compatible controllers, such as MicroLogix, CompactLogix, ControlLogix, SLC 500 or PLC 5.

How to Use

This Manual

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

•

Who should use this manual

•

How to use this manual

•

Related

•

Conventions used in this manual

•

Rockwell Automation support

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

1794sc-IRT8I.

Related

Documentation

The table below provides a listing of publications that contain important information about Allen-Bradley PLC systems.

Document Title

1794 Flex IO Product Data

CompactLogix System Overview

ControlLogix System User Manual

ControlNet Modules in Logix5000 Control Systems

User Manual

EtherNet/IP Modules in Logix5000 Control Systems

User Manual

Allen-Bradley Programmable Controller

Grounding and Wiring Guidelines

Document Number

1794-2.1

1769-SO001A-EN-P

1756-6.5.13-SEP99

CNET-UM001C-EN-P

ENET-UM001G-EN-P

1770-4.1

If you would like a manual, you can:

•

Download a free electronic version from the internet at www.theautomationbookstore.com

•

Purchase a printed manual by: o

Contacting your local distributor or Rockwell Automation representative o

Visiting www.theautomationbookstore.com and placing your order o

Calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574

(Outside USA/Canada)

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vi Flex™ IO Isolated RTD/Thermocouple Module

Conventions

Used in This

Manual

The following conventions are used throughout this manual:

•

Bulleted lists (like this one) provide information not procedural steps.

•

Numbered lists provide sequential steps or hierarchical information.

•

Italic

type is used for emphasis

•

Bold

type identifies headings and sub-headings

•

!

Attention

Are used to identify critical information to the reader

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Chapter 1

Module Overview

This chapter describes the 1794sc-IRT8I Isolated Universal input module and explains how the module reads current, voltage, RTD, resistance and thermocouple/millivolt analog input data. Included is information about:

•

General description

•

Input types and ranges

•

Data Formats and filter frequencies

•

Hardware Features

•

System overview and module operation

•

Auto-calibration

Section 1.1

General

Description

The isolated RTD/Thermocouple module supports current, voltage, RTD, resistance, thermocouple and millivolt type inputs. The module digitally converts and stores analog data from any combination mentioned above. Each input channel is individually configured via software for a specific input device, data format, filter frequency, and provides open-circuit, over-range, under-range detection and indication.

Section 1.2

Input Types and Ranges

The tables below list the input types and their associated ranges.

Input Type Range

B Type Thermocouple 300 to 1820 ˚ C (572 to 3308 ˚ F)

C Type Thermocouple 0 to 2315 ˚ C (32 to 4199 ˚ F)

E Type Thermocouple -270 to 1000 ˚ C (-454 to 1832 ˚ F)

J Type Thermocouple -210 to 1200 ˚ C (-346 to 2192 ˚ F)

K Type Thermocouple -270 to 1370 ˚ C (-454 to 2498 ˚ F)

N Type Thermocouple -210 to 1300 ˚ C (-346 to 2372 ˚ F)

R Type Thermocouple 0 to 1768 ˚ C (32 to 3214 ˚ F)

S Type Thermocouple 0 to 1768 ˚ C

T Type Thermocouple -270 to 400 ˚ C

(32 to 3214

(-270 to 752

˚

˚

F)

F)

100 Ω Pt α 0.385

200 Ω Pt α 0.385

500 Ω Pt α 0.385

1000 Ω Pt α 0.385

-200 to 850

-200 to 850

-200 to 850

-200 to 850

˚

˚

˚

˚

C

C

C

C

(-328 to 1562

(-328 to 1562

(-328 to 1562

(-328 to 1562

˚

˚

˚

˚

F)

F)

F)

F)

100 Ω Pt α 0.3916

200 Ω Pt α 0.3916

500 Ω Pt α 0.3916

1000 Ω Pt α 0.3916

10 Ω Cu α 0.426

100 Ω Ni α 0.618

-200 to 630 ˚ C

-200 to 630 ˚ C

-200 to 630 ˚ C

-200 to 630 ˚ C

-100 to 260 ˚ C

-100 to 260 ˚ C

(-328 to 1166 ˚ F)

(-328 to 1166 ˚ F)

(-328 to 1166 ˚ F)

(-328 to 1166 ˚ F)

(-148 to 500 ˚ F)

(-148 to 500 ˚ F)

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1-2 Flex™ IO Isolated RTD/Thermocouple Module

Input Type

120 Ω Ni α 0.672

604 Ω NiFe α 0.518

Resistance

Voltage

Range

-80 to 260 ˚ C

-100 to 200 ˚ C

0 to 150 Ω

0 to 1000 Ω

0 to 3000 Ω

+/- 50 mV

+/- 100 mV

(-112 to 500 ˚ F)

(-148 to 392 ˚ F)

Section 1.3

Data Formats

For each module the data can be configured for:

•

Engineering units x 1

•

Engineering units x 10

•

Scaled-for-PID

•

Percent of full-scale

•

Raw/proportional data

•

CJC Engineering Units

•

CJC scaled-for-PID

•

CJC percent of full range

Section 1.4

Filter

Frequencies

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

•

4.17 Hz

•

10 Hz

•

16.7 Hz

•

19.6 Hz

•

62 Hz

•

470 Hz

Section 1.5

Hardware

Features

Each module requires a terminal base unit. Terminal base units are connected together to form the backplane for the system. Each base unit contains terminals for field terminations. Field terminations are wired as differential inputs with the exception of

RTD and resistance type inputs. Two cold junction compensation (CJC) sensors can be added to the terminal base unit to enable accurate readings when using thermocouple input types. Each CJC sensor compensates for offset voltages introduced into the input signal as a result of the cold-junction where the thermocouple wires come into contact with the base unit. Module configuration is accomplished using the controller’s programming software. In addition, some controllers support configuration via the user

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Chapter 1: Module Overview 1-3 program. In either case, the module configuration is stored in the memory of the controller. Refer to your controller’s user manual for more information. The illustration below shows the module’s hardware features.

Figure 1-1

1

2

Item Description

4

2 Module key-switch position

3

Section 1.6

System

Overview

The module communicates to the controller through the base unit bus interface. The module also receives 5 and 24V dc power through the bus interface.

Note: An external power supply is required for all 2-wire transmitters.

1.6.1

Module Power-up

At power-up, the module performs a check of its internal circuits, memory and basic functions. After power-up checks are complete, the module waits for valid channel configuration data. If an invalid configuration is detected, the module generates a configuration error. Once a channel is properly configured and enabled, it continuously converts the input data to a digital value within the currently selected data range. Each time a channel is read by the input module, that data value is tested by the module for an over-range, under-range, or open-circuit condition. If such a condition is detected, a unique bit is set in the channel status word. The channel status word is described in the

Input Data File in Chapter 3. Using the module image table, the controller reads the two’s complement binary converted input data from the module. This typically occurs at the end of the program scan or when commanded by the control program. If the controller and the module determine that the data transfer has been made without error, the data is made available to the control program.

Section 1.7

Module

Operation

The module measures each analog signal using a dedicated A/D converter for each

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1-4 Flex™ IO Isolated RTD/Thermocouple Module channel. The converter reads the signal and converts it as required for the type of input selected. If thermocouples are being utilized, the module continuously samples each CJC sensor and compensates for temperature changes at the terminal base cold junction, between the thermocouple wire and the input terminal. See the block diagram below.

Isolation

Barrier

1794 FLEX

Terminal Base Unit

8 Channels &

24VDC PWR

Signal

Conditioning

MUX

1 of 8

ΣΔ

ADC

+ FLTR

8 of 8

MICRO-

CNTRLR

Isolated PWR Supply

24 VDC

Backplane

COMMS

The module is designed to support up to 8 isolated channels of RTD, resistance, voltage, current, or thermocouple.

Thermocouple measurements utilize two cold junction compensation sensors placed at two different locations on the terminal base unit. The location of each CJC sensor was chosen to calculate the overall CJC error accurately for each channel. Thermocouple support includes types J, K, T, E, R, S, B, N, and C. In thermocouple mode the 1794sc-

IRT8I will measure thermocouple and CJC voltages and convert the results to a linearized temperature reading.

RTD support includes types Pt 385, Pt 3916, Ni 618, Ni 672, Cu 426, and NiFe 518. In

RTD and resistance mode the module will inject a constant current through the RTD or resistor, measure the voltage across the resistance and convert to a linearized temperature or resistance reading. The IFIU supports 2 and 3 wired RTD inputs.

When configured for current or voltage type inputs, the module converts the analog values directly into digital counts.

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Chapter 2

Installation and Wiring

This chapter will cover:

•

Compliance to European union directives

•

General considerations

•

Power requirements

•

Installing the module

•

Field wiring connections

Section 2.1

Compliance to

European

Union Directives

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

2.1.1

EMC Directive

The 1794sc-IRT8I module is tested to meet Council Directive 89/336/EEC

Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

•

EN 61000-6-4EMC – Generic Emission Standard, Part 2 - Industrial

Environment

•

EN 61000-6-2EMC – Generic Immunity Standard, Part 2 - Industrial

Environment

This product is intended for use in an industrial environment.

2.1.2

Low Voltage Directive

This product is tested to meet Council Directive 2006/99/EC Low Voltage, by applying the safety requirements of EN 61131-2Programmable Controllers, Part 2 – Equipment

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

•

Industrial Automation, Wiring and Grounding Guidelines for Noise Immunity

, publication 1770-4.1

•

Automation Systems Catalog

, publication B113

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2-2 Flex™ IO Isolated RTD/Thermocouple Module

Section 2.2

General

Considerations

Flex I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments Pollution degree 2

1

II

2

(IEC 60664-1)

3

.

and to circuits not exceeding Over Voltage Category

2.2.1

Hazardous Location Considerations

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

!

Attention

EXPLOSION HAZARD

•

Substitution of components may impair suitability for Class I,

Division 2.

•

Do not replace components or disconnect equipment unless power has been switched off or the area is known to be nonhazardous.

•

Do not connect or disconnect components unless power has been switched off or the area is known to be non-hazardous.

•

This product must be installed in an enclosure.

•

All wiring must comply with N.E.C. article 501-4(b).

2.2.2

Prevent Electrostatic Discharge

!

Attention

Electrostatic discharge can damage integrated circuits or semiconductors if you touch analog I/O module bus connector pins or the terminal block on the input module. Follow these guidelines when you handle the module:

•

Touch a grounded object to discharge static potential.

•

Wear an approved wrist-strap grounding device.

•

Do not touch the bus connector or connector pins.

•

Do not touch circuit components inside the module.

•

If available, use a static-safe work station.

•

When it is not in use, keep the module in its static-shield bag.

1

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

2 occasionally a temporary conductivity caused by condensation shall be expected.

Over Voltage Category II is the load level section of the electrical distribution system. At this level transient voltages are controlled and do not exceed the impulse voltage capability of the product’s

3 insulation.

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

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Chapter 2: Installation and Wiring 2-3

2.2.3

Remove Power

!

Attention

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

•

Sending an erroneous signal to your system’s field devices, causing unintended machine motion

•

Causing an explosion in a hazardous environment

Electrical arcing causes excessive wear to contacts on both the module and its mating connector and may lead to premature failure.

2.2.4

Selecting a Location

Reducing Noise

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

Group your modules to minimize adverse effects from radiated electrical noise and heat.

Consider the following conditions when selecting a location for the analog module.

Position the module:

•

Away from sources of electrical noise such as hard-contact switches, relays, and

AC motor drives

•

Away from modules which generate significant radiated heat, such as the 1794-

OB32. Refer to the module’s heat dissipation specification.

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

I/O wiring.

Section 2.3

Power

Requirements

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

5 VDC 24 VDC

80 mA 240 mA

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.

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

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2-4 Flex™ IO Isolated RTD/Thermocouple Module

2.3.1

Wiring the Terminal Base Units (1794-TB3G shown)

!

Attention

Daisy-chaining

Do not daisy chain power or ground from the terminal base unit to any ac or dc digital module terminal base unit.

Power

IF8u

Module

IF8u

Module

Frequency Input

Module

24 VDC

Note: All modules must be frequency or IRT8I modules for this configuration.

Wiring when total current draw is less than 10A

Individual

Power

Digital Input

Module

IF8u

Module

Digital Input

Module

24 VDC

24 VDC

24 VDC

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

IRT8I module wiring separate from digital wiring

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Chapter 2: Installation and Wiring

Combination

Wiring when total current draw is greater than 10A

Power

Frequency Input

Module

IF8u

Module

2-5

Frequency Input

Module

24 VDC

Section 2.4

Installing the

Module

24 VDC

Note: All modules powered by the same power supply must be frequency or IRT8I modules for this configuration.

Total current draw through any base unit must not be greater than

10A

Installation of the analog module consists of:

•

Mounting the terminal base unit

•

Installing the IRT8I module into the terminal base unit

•

Installing the connecting wiring to the terminal base unit

If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the IRT8I Module on the Terminal Base Unit” on page 2-9.

2.4.1

Mounting the Terminal Base Unit on a DIN Rail

!

Attention

Do not remove or replace a terminal base unit when power is applied.

Interruption of the flexbus can result in unintended operation or machine motion.

1) Remove the cover plug (if used) in the male connector of the unit to which you are connecting this terminal base unit.

2) Check to make sure that the 16 pins in the male connector on the adjacent device are straight and in line so that the mating female connector on this terminal base unit will mate correctly.

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

46277-3) at a slight angle with hook B on the left side of the terminal base hooked into the right side of the unit on the left. Proceed as follows:

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4) Repeat the above steps to install the next terminal base.

2.4.2

Panel/Wall Mounting

Installation on a wall or panel consists of:

•

Laying out the drilling points on the wall or panel

•

Drilling the pilot holes for the mounting screws

•

Mounting the adapter mounting plate

•

Installing the terminal base units and securing them to the wall or panel

If you are installing your module into a terminal base unit that is already installed, proceed to “Mounting the IRT8I Module on the Terminal Base Unit” on page 2-9.

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

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To install the mounting plate on a wall or panel:

1) Lay out the required points on the wall/panel as shown in the drilling dimension drawing.

Drilling Dimensions for Panel/Wall Mounting of Flex IO

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

3) Mount the mounting plate (1) for the adapter module using two#6 self-tapping screws (18 included for mounting up to 8 modules and the adapter).

!

Attention

Make certain that the mounting plate is properly grounded to the panel. Refer to “Industrial Automation Wiring and Grounding

Guidelines,” publication1770-4.1.

4) Hold the adapter (2) at a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module.

5) Press the adapter down flush with the panel until the locking lever locks.

6) Position the terminal base unit up against the adapter and push the female bus connector into the adapter.

7) Secure to the wall with two #6 self-tapping screws.

8) Repeat for each remaining terminal base unit.

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

2.4.3

Mounting the IRT8I Module on the Terminal Base Unit

The IRT8I isolated input module mounts on a 1794-TB3G or TB3GS terminal base unit.

1) Rotate the key-switch (1) on the terminal base unit (2) clockwise to position 3 as required for the IRT8I 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.

3) Make sure that the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base unit.

!

Attention

This module is UL listed only when used with listed Allen-Bradley catalog numbers 1794-TB3G or TB3GS terminal base units.

!

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.

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

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2-10 Flex™ IO Isolated RTD/Thermocouple Module is seated when the latching mechanism (7) is locked into the module.

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

Section 2.5

Field Wiring

Connections

Wiring to the IRT8I module is made through the terminal base unit on which the module mounts. Compatible terminal base units are:

1794sc-IRT8I Yes Yes

2.5.1

Field Wiring using a 1794-TB3G and TB3GS Terminal Base

1) Connect the individual signal wiring to numbered terminals on the 0–15 row (A) and 17–32 row(B) on the terminal base unit. Connect the input devices as shown in the wiring table on page 2-11 .

2) Terminate shields: to terminals 16 or 33 on row B, or 40 through 45 on row C.

3) Connect +24V dc to terminal 34 on the 34-51 row (C), and 24V common to terminal 35 on the 34-51 row (C).

!

Attention

To reduce susceptibility to noise, power IRT8I modules and digital modules from separate power supplies. Do not exceed a length of 33ft

(10m) for dc power cabling.

4) If daisy chaining the +24V dc power to the next base unit, connect a jumper from terminal 50 (+24V) on this base unit to terminal 34 and from terminal 51

(24V dc common) to terminal 35 on the next base unit.

!

Attention

Do not daisy chain power or ground from the IRT8I terminal base unit to any ac or dc digital module terminal base unit.

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!

Attention

The IRT8I module does 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

Use supply wire for 10˚C above surrounding ambient.

Figure 2-1

Table 2-1

Type of Input

RTD/Res 2-wire

Connect The Following

R IN+ IN- I Shield

1

1 2

Millivolt

1

Shield can be connected to chassis ground terminals 16, 33, and 40…45.

2

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RTD/Resistance

2-wire

Jumper

1

3-wire

1

0

2

0

2

Thermocouple

+

1

1

2

-

mV Source

1

+ mV

-

2

Table 2-2

Numbers 0, 1, 2, and 3 are wiring numbers of the sensor used. For terminal numbers corresponding to

R, IN+, IN-, I, refer to Terminal Base Unit Wiring

Connections below.

+ Chassis

CJC1 C37

Ground

C38

- CJC

Tail

1

C39 A1

1

CJC2 C-46 C-47 C-48 B31

Terminals 37, 38, and 39, and 46, 47, and 48 are for cold junction compensation (with 38 and 47 chassis GND). Connect the tail of CJC 1 to terminal 1 and CJC2 to terminal 31 if channels 0…3 or 0…7 are configured for thermocouples.

Table 2-3

Channel Number

1794-TB3G and 1794-TB3GS Terminal Base Units

Signal Return (R) Input + Input I Return

(IN+) (-) (-)

1Terminals 16, 33, and 40…45 are chassis ground.

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!

Attention

Total current draw through the terminal base unit is limited to 10A.

Separate power connections to the terminal base unit may be necessary.

The following examples show how to wire the IF8U using the tables and diagrams listed above.

Figure 2-2 (RTD & Resistance Wiring Diagram)

R

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Figure 2-3 (Thermocouple Wiring Diagram)

Figure 2-4 (Millivolt Wiring Diagram)

!

Attention

Digital and analog power must be supplied by an Isolated Secondary

Limited Energy Low Voltage source.

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Section 2.6

Module Indicators

The IRT8I module has one status indicator (OK) that is on when power is applied and no hardware faults are present. See figure below.

Figure 2-5

1

2

Item Description

4

2 Module key-switch position

3

Table 2-4 (Module Status LED)

Module

State

New

Not

Config

Idle

Active

Fault

Fatal

Fault

Power up initialized complete and passed Self-Test. Loads stored configuration, if it exist. Read Module Information Block. (see notes)

Module has not received configuration from Master. It can Set and

Get attributes. (see notes)

Controller in Program mode.

Communications normal

Controller in Run mode & Communication Is normal

FlexIO Comm. Fault or PU bit is one and /Fault=0

Module fails self tests or detects illegal state transition

State

RED, blink

@1 Hz

GREEN, blink @1 Hz

GREEN, solid

GREEN, solid

GREEN, solid

RED, solid

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Chapter 3

Configuring the 1794sc-IRT8I

Using RSLogix 5000

This chapter covers the following subjects:

•

Things you should know

•

Module memory map

•

Configure generic profile

•

Module configuration

•

Reading input/status data

Section 3.1

Things You

Should Know

This chapter describes how to configure the IRT8I module for the ControlLogix and

CompactLogix system. In the examples below, the Control Net adapter and/or Ethernet adapter were used for communication between the Logix processor and the Flex IO bus.

Note: Refer to the associated I/O scanner documentation if using a SLC controller with Control Net.

Note: If using a PLC 5 controller, refer to the PLC 5 controller documentation for Control Net configuration information.

!

Attention

The Remote I/O and Device Net adapters do not support the 1794sc-

IRT8I module. The IRT8I module is supported only by the Control Net and Ethernet adapters.

Section 3.2

Module Memory

Map

The following figure describes the data mapping for the module. The configuration image is written to the module using tags generated by the “generic Flex module” profile used to represent the IRT8I within RSLogix 5000. See section 3.3.3 for more details.

Input data and status data can be read from the module using the input image and status image. Again, tags generated by the “generic Flex module” profile will be used to read the input and status image data.

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Figure 3-1 (Module Memory Map)

Read

Input Image

I:0 to I:7( 8 words)

(Input Data)

Read

Status Image

S:0 to S:3 (4 Words)

(Status Data)

Write

Configuration Image

C:0 to C:32 (33 words)

(Configuration Data)

1794sc-IRT8I

Section 3.3

Configure

Generic Profile

The generic Flex module profile is used to represent the IRT8I module within RSLogix

5000 since there’s no custom profile available. Before the generic profile can be added to the IO configuration, the proper communication module needs to be added to the IO configuration first. Follow the procedure below to add a communication module to

RSLogix 5000.

1.

Add the new local communication module to your project.

2.

Configure the local module, including: a.

Naming the module b.

Choosing a Communication Format c.

Setting the Revision level d.

Setting the module location as necessary such as the slot number for a

1756-CNB module e.

Choosing an Electronic Keying method

3.

Add the new remote module to your project, such as a Flex Control Net adapter or Ethernet Adapter (i.e. 1794-ACN15 or 1794-AENT, respectively).

4.

Configure the remote module similarly to the local module

5.

Download the configuration to the controller

Note: If you are using Control Net, you must schedule the network using

“RSNetworks for Control Net” after adding the local and remote communication modules.

Note: When you create a new RSLogix 5000 project with the CompactLogix

1769-L32C or L35CR controller, The Controller Organizer creates a Control

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Net port in the local chassis. In this case, you don’t need to add a separate local communication module.

Note: When you create a new RSLogix 5000 project with the CompactLogix

1769-L23E, 1769-L32E or L35E controller, The Controller Organizer creates a Ethernet port in the local chassis. In this case, you don’t need to add a separate local communication module.

3.3.1

Add a Local Ethernet Bridge Module

After you have started RSLogix 5000 software and created a controller project, you can add Ethernet communication modules. A local Ethernet communication module is a module that resides in the same chassis as the controller.

1.

Select a New Module for the I/O Configuration.

Right-click on I/O

Configuration

Select New Module

2.

Select the module type from the Select Module Type pop-up. The example below uses a 1756-ENBT module.

Select the local Ethernet bridge module

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Click OK

3-4

Name the module

Flex™ IO Isolated RTD/Thermocouple Module

3.

Configure the local Ethernet bridge module.

Enter IP address of ENBT

Select the module’s slot number

Select the module’s revision level

Select electronic keying level

Click OK

3.3.2

Add a Remote Ethernet Flex Adapter

After you have added the local Ethernet communication module, you must add remote

Ethernet communication modules. A remote Ethernet module is a module that resides in a separate chassis from the controller.

!

Attention

If you plan to use the Flex Control Net adapter, you will need to install the 1794sc-IRT8I EDS file before scheduling the network. The latest

EDS files can be found at (www.spectrumcontrols.com).

1.

Select a New Module for the I/O Configuration.

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Right-click on the local communication module

Select New Module

2.

Select the module type from the Select Module Type pop-up.

Select the remote Ethernet communication module.

3.

Configure the remote Ethernet communication module.

Click OK

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Name the module

Enter IP address of ENBT

Select the comm. format

Select the chassis size

Select the module revision level

Select electronic keying level

Click OK

3.3.3

Add the Generic Flex Module

After adding the remote Ethernet communication module, the Generic Flex Module must be added. The Generic Flex Module is required because there is no custom profile for the

1794sc-IRT8I module. The following steps must be followed to add the Generic Flex

Module.

1.

Select a New Module for the I/O Configuration.

Right-click on the local communication module

Select New Module

2.

Select the module type from the Select Module Type pop-up.

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Select Generic Flex

Module

Click OK

3.

Configure the Generic Flex Module (i.e. 1794sc-IRT8I)

Name the module

Enter “Input Data – INT” for

Comm. Format

Enter module slot #

Enter the input size

(Always 8 for the IRT8I)

Enter the config. size

(Always 49 for the IRT8I)

Enter the status size

(Always 4 for the IRT8I)

Click OK

Section 3.4

Module

Configuration

The addition of the Generic Flex Module profile makes it possible to enter the configuration data for the IRT8I module. The configuration tags for the IRT8I are located under the controller tags. The following figure describes the tag structure allocated by the Generic Flex Module profile.

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[Name of remote communication module]:e:x.Data[0 to 184] e = IRT8I slot number x = Image Type (i.e. C, I, or O)

Note: 185 words are allocated by the Generic Flex Module profile, but only

49 are actually used by the IRT8I module for configuration.

In the example above, the configuration tags for the first IRT8I module would appear as shown in the image below.

Figure 3-2 (Configuration Tags Example)

Note: The slot number is “0” and the Image type is “C” for configuration.

The following table describes the configuration settings for the 1794sc-IRT8I module.

Table 3-1 (Configuration Table)

Usage (16 bit words):

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

C:0 R

1

R

1

F7 F6 F5 F4 R

1

R

1

R

1

F3 F2 F1 F0 R

C:1 Temp

Units

Ch0

Disable

CJC

Ch0

Open

Circuit

Ch0

R

1

Data

Format

Ch0

Input

Filter

Ch0

Input

Type

CH0

C:2 Temp

Units

Ch1

C:3 Temp

Units

Ch2

C:4 Temp

Units

Ch3

C:5 Temp

Units

Ch4

C:6 Temp

Units

Ch5

Disable

CJC

Ch1

Disable

CJC

Ch2

Disable

CJC

Ch3

Disable

CJC

Ch4

Disable

CJC

Ch5

Open

Circuit

Ch1

Open

Circuit

Ch2

Open

Circuit

Ch3

Open

Circuit

Ch4

Open

Circuit

Ch5

R

R

R

R

R

1

1

1

1

1

Data

Format

Ch1

Data

Format

Ch2

Data

Format

Ch3

Data

Format

Ch4

Data

Format

Ch5

Input

Filter

Ch1

Input

Filter

Ch2

Input

Filter

Ch3

Input

Filter

Ch4

Input

Filter

Ch5

Input

Type

CH1

Input

Type

CH2

Input

Type

CH3

Input

Type

CH4

Input

Type

CH5

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Usage (16 bit words):

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

C:7 Temp Disable Open Data Input Input

Units

Ch6

CJC

Ch6

Circuit

Ch6

R

1

Format

Ch6

Filter

Ch6

Type

CH6

C:8 Temp

Units

Ch7

Disable

CJC

Ch7

Open

Circuit

Ch7

R

1

Data

Format

Ch7

Input

Filter

Ch7

Input

Type

CH7

C:9 CH0 User Low Alarm Threshold

C:10 CH0 User High Alarm Threshold

C:11 CH0 User Alarm Deadband

C:12 CH1 User Low Alarm Threshold

C:13 CH1 User High Alarm Threshold

C:14 CH1 User Alarm Deadband

C:15 CH2 User Low Alarm Threshold

C:16 CH2 User High Alarm Threshold

C:17 CH2 User Alarm Deadband

C:18 CH3 User Low Alarm Threshold

C:19 CH3 User High Alarm Threshold

C:20 CH3 User Alarm Deadband

C:21 CH4 User Low Alarm Threshold

C:22 CH4 User High Alarm Threshold

C:23 CH4 User Alarm Deadband

C:24 CH5 User Low Alarm Threshold

C:25 CH5 User High Alarm Threshold

C:26 CH5 User Alarm Deadband

C:27 CH6 User Low Alarm Threshold

C:28 CH6 User High Alarm Threshold

C:29 CH6 User Alarm Deadband

C:30 CH7 User Low Alarm Threshold

C:31 CH7 User High Alarm Threshold

1

C:32 CH7 User Alarm Deadband

Reserved set to zero

3.4.1

Fault Mode [Word 0 (Bits 2,3,4,5,10,11,12,13)]

The fault mode bits are used to enable or disable “broken wire detection”. See table below.

Table 3-2 (Fault Mode)

State Function

0 Disabled

1 Enable Broken Wire Detection

3.4.2

Input Type [Words 1 – 8 (Bits 0 to 4)]

Use the table below to select the input type for each channel.

Table 3-3 (Input Type)

Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Range:

0 0 0 0 0 B Thermocouple

0 0 0 0 1 C Thermocouple

0 0 0 1 0 E Thermocouple

0 0 0 1 1 J Thermocouple

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Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Range:

0 0 1 0 0 K

0 0 1 0 1 N Thermocouple

0 0 1 1 0 R Thermocouple

0 0 1 1 1 S Thermocouple

0 1 0 0 0 T Thermocouple

0 1 0 0 1 100 α 0.385

0 1 0 1 0 200 α 0.385

0 1 0 1 1 500 α 0.385

0 1 1 0 0 1000 α 0.385

0 1 1 0 1 100 α 0.3916

0 1 1 1 0 200 α 0.3916

0 1 1 1 1 500 α 0.3916

1 0 0 0 0 1000 α 0.3916

1 0 0 0 1 10 α 0.426

1 0 0 1 0 100 α 0.618

1 0 0 1 1 120 α 0.672

1 0 1 0 0 604 α 0.518 to to Ω to Ω

3.4.3

Input Filter [Words 1 – 8 (Bits 5 to 7)

Use the table below to select the appropriate filter for each channel.

Table 3-4 (Filter Settings)

Bit 7 Bit 6 Bit 5 ADC Filter:

1 1 0 *Unused

1 1 1 *Unused

3.4.4

Data Format [Words 1 – 8 (Bits 8 to 10)

Select the appropriate data type for each channel using the table below. Refer to Table

3-6 for data type ranges.

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Table 3-5 (Data Format)

Bit 10 Bit9 Bit 8 Format:

0 0 1 Engineering Units X10

1 0 0

1

Percent of Full Scale

1

0

CJC EU

1

CJC Scaled for PID

CJC Percent of Full Scale

1

If selected, the CJC format will override all ranges/formats and report the indicated CJC value for this channel. Channel zero will report CJC0 directly. Channel 7 will report CJC1 directly.

All others will be distributed values between CJC0 and CJC1 based on channel position.

Table 3-6 (Data Ranges)

Input Type

B Type Thermocouple

Range

300 to 1820 ˚ C

(572 to 3308 ˚ F)

C Type Thermocouple

E Type Thermocouple

J Type Thermocouple

K Type Thermocouple

N Type Thermocouple

R Type Thermocouple

S Type Thermocouple

T Type Thermocouple

100 Ω Pt α 0.385

200 Ω Pt α 0.385

500 Ω Pt α 0.385

1000 Ω Pt α 0.385

100 Ω Pt α 0.3916

200 Ω Pt α 0.3916

500 Ω Pt α 0.3916

1000 Ω Pt α 0.3916

10 Ω Cu α 0.426

100 Ω Ni α 0.618

120 Ω Ni α 0.672

604 Ω NiFe α 0.518

Resistance

0 to 2315 ˚ C

(32 to 4199 ˚ F)

-270 to 1000 ˚ C

(-454 to 1832 ˚ F)

-210 to 1200 ˚ C

(-346 to 2192 ˚ F)

-270 to 1370 ˚ C

(-454 to 2498 ˚ F)

-210 to 1300 ˚ C

(-346 to 2372 ˚ F)

0 to 1768 ˚ C

(32 to 3214 ˚ F)

0 to 1768 ˚ C

(32 to 3214 ˚ F)

-270 to 400 ˚ C

(-270 to 752 ˚ F)

-200 to 850 ˚ C

(-328 to 1562 ˚ F)

-200 to 850 ˚ C

(-328 to 1562 ˚ F)

-200 to 850 ˚ C

(-328 to 1562 ˚ F)

-200 to 850 ˚ C

(-328 to 1562 ˚ F)

-200 to 630 ˚ C

(-328 to 1166 ˚ F)

-200 to 630 ˚ C

(-328 to 1166 ˚ F)

-200 to 630 ˚ C

(-328 to 1166 ˚ F)

-200 to 630 ˚ C

(-328 to 1166 ˚ F)

-100 to 260 ˚ C

(-148 to 500 ˚ F)

-100 to 260 ˚ C

(-148 to 500 ˚ F)

-80 to 260 ˚ C

(-112 to 500 ˚ F)

-100 to 200 ˚ C

(-148 to 392 ˚ F)

0 to 150 Ω

0 to 1000 Ω

0 to 3000 Ω

Eng. Units

3000 to 18200

(5720 to 33080)

0 to 23150

(320 to 41990)

-2700 to 10000

(-4540 to 18320)

-2100 to 12000

(-3460 to 21920)

-2700 to 13700

(-4540 to 24980)

-2100 to 13000

(-3460 to 23720)

0 to 17680

(320 to 32140)

0 to 17680

(320 to 32140)

-2700 to 4000

(-2700 to 7520)

-2000 to 8500

(-3280 to 15620)

-2000 to 8500

(-3280 to 15620)

-2000 to 8500

(-3280 to 15620)

-2000 to 8500

(-3280 to 15620)

-2000 to 6300

(-3280 to 11660)

-2000 to 6300

(-3280 to 11660)

-2000 to 6300

(-3280 to 11660)

-2000 to 6300

(-3280 to 11660)

-1000 to 2600

(-1480 to 5000)

-1000 to 2600

(-1480 to 5000)

-800 to 2600

(-1120 to 5000)

-1000 to 2000

(-1480 to 3920)

0 to 15000

0 to 10000

0 to 30000

Eng Units X10 Raw/Prop

300 to 1820 -32768 to 32767

PID

0 to 16383

Percent

0 to 10000

(572 to 3308)

-32768 to 32767 0 to 16383 0 to 10000 0 to 2315

(32 to 4199)

-270 to 1000

(-454 to 1832)

-210 to 1200

(-346 to 2192)

-32768 to 32767

-32768 to 32767

0 to 16383

0 to 16383

0 to 10000

0 to 10000

-32768 to 32767 0 to 16383 0 to 10000 -270 to 1370

(-454 to 2498)

-210 to 1300

(-346 to 2372)

0 to 1768

(32 to 3214)

0 to 1768

(32 to 3214)

-270 to 400

(-270 to 752)

-200 to 850

(-328 to 1562)

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 10000

0 to 10000

0 to 10000

0 to 10000

0 to 10000

-32768 to 32767 0 to 16383 0 to 10000 -200 to 850

(-328 to 1562)

-200 to 850

(-328 to 1562)

-200 to 850

(-328 to 1562)

-200 to 630

(-328 to 1166)

-200 to 630

(-328 to 1166)

-200 to 630

(-328 to 1166)

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 10000

0 to 10000

0 to 10000

0 to 10000

0 to 10000

-200 to 630

(-328 to 1166)

-100 to 260

(-148 to 500)

-100 to 260

(-148 to 500)

-80 to 260

(-112 to 500)

-100 to 200

(-148 to 392)

0 to 1500

0 to 1000

0 to 3000

-32768 to 32767 0 to 16383 0 to 10000

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

-32768 to 32767

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 16383

0 to 10000

0 to 10000

0 to 10000

0 to 10000

0 to 10000

0 to 10000

0 to 10000

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3-12 Flex™ IO Isolated RTD/Thermocouple Module

3.4.5

Open Circuit Mode [Words 1 – 8 (Bits 12 & 13)]

The open circuit mode determines the fail-safe data value each channel is to default to in the event of an open circuit condition. The table below lists the available options.

Table 3-7 (Open Circuit Mode)

Bit 13 Bit 12 Open Circuit Mode:

0 0 Zero analog value on broken input.

0

1

1

0

Set analog value to Max scale on broken input.

Set analog value to Min scale on broken input.

3.4.6

Disable CJC [Words 1 – 8 (Bit 14)]

This bit is used to disable CJC compensation for the associated channel.

Table 3-8 (Disable CJC)

State Function

0 CJCs

1

1

Disabled

1

This field is only used if the input type is a thermocouple and the format is not a CJC format. No compensation is performed on the thermocouple when disabled.

3.4.7

Temperature Units [Words 1 – 8 (Bit 15)]

This bit enables Celsius or Fahrenheit for the associated channel.

Note: If the associated channel is not configured for an RTD or thermocouple, the temperature units have no effect.

Table 3-9 (Temperature Units)

State Function

3.4.8

Low Alarm Threshold [Words 9,12,15,18,21,24,27,30]

Low alarm threshold setting for channels 0 through 7, respectively.

Note: The data range is determined by the data format selected.

3.4.9

High Alarm Threshold [Words 10,13,16,19,22,25,28,31]

High alarm threshold setting for channels 0 through 7, respectively.

Note: The data range is determined by the data format selected.

3.4.10

User Alarm Deadband [Words 11,14,17,20,23,26,29,32]

The deadband is a range through which the measured input may be varied without initiating and alarm response. The deadband setting must adhere to the following rules:

•

The deadband must be greater or equal to zero.

•

The deadband cannot exceed 25% of full scale.

•

The alarm limits including deadband may not exceed the user range limits.

•

The low alarm including deadband may not overlap the high alarm including

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Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-13 deadband.

If any of these rules are violated, a configuration error is declared, and the alarm is disabled. The notable exception is when the “low” is equal to the “high” and both are set to zero. In this case, user alarms are disabled, the deadband is ignored, and no fault is declared.

Note: The data range is determined by the data format selected.

The alarm deadband allows the user to define hysteresis for alarms. The alarm set threshold may differ from the alarm clear threshold, depending on the deadband, as illustrated below. A value must transition through the indicated threshold (see dashed arrows) to have the indicated effect.

If a CJC format is selected, the alarm limits apply to that CJC format, not to that channel’s analog input.

Figure 3-3 (Alarm DeadBand)

Low Alarm Threshold (Set)

High Alarm Threshold (Set)

Low Alarm Dead Band Normal Dead Band High Alarm

Low Alarm Threshold + deadband

(Clear)

High Alarm Threshold – deadband

(Clear)

Section 3.5

Read Input

& Status Data

Input and status data is read for each channel, converted to a scaled digital value, and stored in the controller tags. The following figure describes the tag structure allocated by the Generic Flex Module profile.

[Name of remote communication module]:e:x.Data[0 to 184] e = IRT8I slot number x = Image Type (i.e. C, I, or O)

Using the remote Ethernet adapter example, the input/status tags would appear under the controller tags as shown in the figure below.

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3-14 Flex™ IO Isolated RTD/Thermocouple Module

Figure 3-4 (Input/Status Tags)

Note: The slot number is “0” and the image type is “I”.

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Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix 3-15

The table below describes the input and status mapping.

Table 3-10 (Input & Status)

Usage (16 bit words):

I:0 Channel 0 input Data.

I:1 Channel 1 input Data.

I:2 Channel 2 input Data.

I:3 Channel 3 input Data.

I:4 Channel 4 input Data.

I:5 Channel 5 input Data.

I:6 Channel 6 input Data.

I:7 Channel 7 input Data.

S:2 Reserved

9 8 7 6 5 4 3 2 1 0

S:0 OverRange (CH0/Bit 8, CH1/Bit 9, …)

S:1

5

User HI Alarms (CH0/Bit8, CH1/Bit9, …)

CJC

Alarm

4

5

UnderRange (CH0/Bit 0, CH1/Bit 1, …)

User LO Alarms(CH0/Bit0, CH1/Bit1, …)

6,

4

Open Circuit Alarms (CH0/Bit0,

CH1/Bit1, …)

S:3 Reserved Diagnostic Code (See )

3.5.1

Input Data [Words 0 to 7]

Words 0 through 7 display the digital value for channel inputs 0 through 7, respectively.

Scaling/range is determined by the data format selected. See 3.4.4 for more details.

3.5.2

UnderRange Alarms [Word 8 (Bits 0 to 7)]

The under range flag is set for the associated channel when the channel data value is below the minimum scale for the selected range.

3.5.3

OverRange Alarm [Word 8 (Bits 8 to 15)]

The over range flag is set for the associated channel when the channel data value is above the maximum scale for the selected range.

3.5.4

User Low Alarm [Word 9 (Bits 0 to 7)]

The user low alarm flag is set for the associated channel when the channel data value is below the user low alarm threshold.

3.5.5

User High Alarm [Word 9 (Bits 8 to 15)]

The user high alarm flag is set for the associated channel when the channel data value is above the user high alarm threshold.

3.5.6

Open Circuit Alarm [Word 10 (Bits 0 to 7)]

If set, the associated channel has detected a shorted or open circuit condition.

4

For the 0 to 20 mA range, a zero reading is valid. Therefore, under range will not trigger at the low terminus of zero, but will instead trigger when the signal goes negative at or below %2.5 of full scale. 20 –

0 = 20. -0.025 X 20 = -0.5mA.

6

5

Channel specific range alarms will apply to CJC values if a CJC format is selected for that channel.

Channel specific open circuit alarm will not be set if a CJC format is selected for that channel.

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3-16 Flex™ IO Isolated RTD/Thermocouple Module

3.5.7

CJC Alarm [Word 10 (Bits 8 & 9)]

The CJC alarm indicates a broken wire condition for both CJC sensors. Refer to the table below.

Table 3-11 (CJC Alarms)

Bit 9 Bit 8 CJC Alarm:

1 1 Both CJC1 and CJC2 are broken.

3.5.8

Diagnostics [Word 11 (Bits 0 to 7)]

The diagnostic byte is used to indicate module faults. Refer to the table below for more information.

Table 3-12 (Diagnostics)

Hex Error Code: Diagnostic:

0x00 NO_ERRORS

0x10 CH0_RANGE_CFG_ERROR

0x11 CH1_RANGE_CFG_ERROR

0x12 CH2_RANGE_CFG_ERROR

0x13 CH3_RANGE_CFG_ERROR

0x14 CH4_RANGE_CFG_ERROR

0x15 CH5_RANGE_CFG_ERROR

0x16 CH6_RANGE_CFG_ERROR

0x17 CH7_RANGE_CFG_ERROR

0x20 CH0_FORMAT_CFG_ERROR

0x21 CH1_FORMAT_CFG_ERROR

0x22 CH2_FORMAT_CFG_ERROR

0x23 CH3_FORMAT_CFG_ERROR

0x24 CH4_FORMAT_CFG_ERROR

0x25 CH5_FORMAT_CFG_ERROR

0x26 CH6_FORMAT_CFG_ERROR

0x27 CH7_FORMAT_CFG_ERROR

0x30 CH0_FILTER_CFG_ERROR

0x31 CH1_FILTER_CFG_ERROR

0x32 CH2_FILTER_CFG_ERROR

0x33 CH3_FILTER_CFG_ERROR

0x34 CH4_FILTER_CFG_ERROR

0x35 CH5_FILTER_CFG_ERROR

0x36 CH6_FILTER_CFG_ERROR

0x37 CH7_FILTER_CFG_ERROR

0x40 CH0_HI_LO_ALARM_CFG_ERROR

0x41 CH1_HI_LO_ALARM_CFG_ERROR

0x42 CH2_HI_LO_ALARM_CFG_ERROR

0x43 CH3_HI_LO_ALARM_CFG_ERROR

0x44 CH4_HI_LO_ALARM_CFG_ERROR

0x45 CH5_HI_LO_ALARM_CFG_ERROR

0x46 CH6_HI_LO_ALARM_CFG_ERROR

0x47 CH7_HI_LO_ALARM_CFG_ERROR

0x50 CH0_OUT_OF_RANGE_ERROR

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Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix

Hex Error Code: Diagnostic:

0x51 CH1_OUT_OF_RANGE_ERROR

0x52 CH2_OUT_OF_RANGE_ERROR

0x53 CH3_OUT_OF_RANGE_ERROR

0x54 CH4_OUT_OF_RANGE_ERROR

0x55 CH5_OUT_OF_RANGE_ERROR

0x56 CH6_OUT_OF_RANGE_ERROR

0x57 CH7_OUT_OF_RANGE_ERROR

0x59 Unused module cfg bits set

0x5F MODULE_NOT_CONFIGURED

0x60

0x61

CH0 Cal Offset CFG Error

CH1 Cal Offset CFG Error

0x62

0x63

0x64

0x65

CH2 Cal Offset CFG Error

CH3 Cal Offset CFG Error

CH4 Cal Offset CFG Error

CH5 Cal Offset CFG Error

0x66

0x67

0x70

0x71

0x72

0x73

0x74

0x75

CH6 Cal Offset CFG Error

CH7 Cal Offset CFG Error

CH0 CJC Offset CFG Error

CH1 CJC Offset CFG Error

CH2 CJC Offset CFG Error

CH3 CJC Offset CFG Error

CH4 CJC Offset CFG Error

CH5 CJC Offset CFG Error

0x76

0x77

CH6 CJC Offset CFG Error

CH7 CJC Offset CFG Error

0x80 FIELD_PWR_FAULT

0x90 CH0_CAL_ERROR

0x91 CH1_CAL_ERROR

0x92 CH2_CAL_ERROR

0x93 CH3_CAL_ERROR

0x94 CH4_CAL_ERROR

0x95 CH5_CAL_ERROR

0x96 CH6_CAL_ERROR

0x97 CH7_CAL_ERROR

0xA0 CH0_IOCOMM_FAILED

0xA1 CH1_IOCOMM_FAILED

0xA2 CH2_IOCOMM_FAILED

0xA3 CH3_IOCOMM_FAILED

0xA4 CH4_IOCOMM_FAILED

0xA5 CH5_IOCOMM_FAILED

0xA6 CH6_IOCOMM_FAILED

0xA7 CH7_IOCOMM_FAILED

0xB0 CH0_BROKEN_INPUT

0xB1 CH1_BROKEN_INPUT

0xB2 CH2_BROKEN_INPUT

0xB3 CH3_BROKEN_INPUT

0xB4 CH4_BROKEN_INPUT

0xB5 CH5_BROKEN_INPUT

0xB6 CH6_BROKEN_INPUT

0xB7 CH7_BROKEN_INPUT

0xC0 CJC0_BROKEN_INPUT

0xC1 CJC1_BROKEN_INPUT

0xC2 CJC_BOTH_BROKEN_INPUT

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3-17

3-18 Flex™ IO Isolated RTD/Thermocouple Module

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Appendix A

Module Specifications

Number of inputs

Module Location

Nominal input voltage ranges

Supported thermocouple types

Supported RTD/Resistance types

8 channels

Cat. No. 1794-TB3G, 1794-TB3GS

Terminal Base Units

±50 mV, ±100 mV

Type °C Range °F Range

B 300…1820 °C (572…3308 °F)

C 0…2315 °C (32…4199 °F)

E -270…1000 °C (-454…1832 °F)

J -210…1200 °C (-346…2192 °F)

K -270…1370 °C (-454…2498 °F)

N -210…1300 °C (-346…2372 °F)

R 0…1768 °C (32…3214 °F)

S 0…1768 °C (32…3214 °F)

T -270…400 °C (-454…752 °F)

RTD

100 Ω Pt α = 0.385

-200…850 °C (-328…1562 °F)

200 Ω Pt α = 0.385

-200…850 °C (-328…1562 °F)

500 Ω Pt α = 0.385

-200…850 °C (-328…1562 °F)

1000 Ω Pt α = 0.385

-200…850 °C (-328…1562 °F)

100 Ω Pt α = 0.392

-200…630 °C (-328…1166 °F)

200 Ω Pt α = 0.392

-200…630 °C (-328…1166 °F)

500 Ω Pt α = 0.392

-200…630 °C (-328…1166 °F)

1000 Ω Pt α = 0.392

-200…630 °C (-328…1166 °F)

10 Ω Cu α = 0.426

-100…260 °C (-148…500 °F)

100 Ω Ni α = 0.618

-100…260 °C (-148…500 °F)

120 Ω Ni α = 0.672

-80…260 °C (-112…500 °F)

604 Ω NiFe α = 0.518

-100…200 °C (-148…392 °F)

Resistance

0…150 Ω

0…1000 Ω

0…3000 Ω

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A-2 Flex™ IO Isolated RTD/Thermocouple Module

Data format

Input Impedance

Common mode rejection

Isolation voltage (continuous voltage withstand rating)

Open circuit protection

Engineering Units X1

Engineering Units X10

Raw/Proportional Counts

Scaled for PID

Percent of full scale

>1 M ohms for voltage, thermocouple, RTD and resistance inputs

60 db @ 5V peak-to-peak, 50…60 Hz

User power to Backplane:24 VDC continuous

Channel to Backplane: 24 VDC continuous

Channel to Channel: 24 VDC continuous.

Channel to User power: 24 VDC continuous

Open circuit detection bias <1 uA with

ON/OFF capability

Overvoltage capability

Cold junction compensation Range

Cold junction compensator

Flexbus current

Power dissipation

Thermal dissipation

Keyswitch position

Module Accuracy

Voltage mode ± 24 VDC continuous (ten minutes)

-20…100 °C

A-B catalog number 1794-CJC2

80 mA

7.25 W max @ 31.2V dc

Max 10.2 BTU/hr @ 31.2V dc

3

Thermocouple Accuracy with 4.17 Hz filter using Linearization per ITS-90

Type J (-50 ˚ C to 1200 ˚ C):

Type J (-210 ˚ C to -50 ˚ C):

Type N (-80 ˚ C to 1300 ˚ C):

Type N (-250 ˚ C to -80 ˚ C):

Type T (-180 ˚ C to 400 ˚ C):

Type T (-270 ˚ C to -180 ˚ C):

Type K (-180 ˚ C to 1370 ˚ C):

Type K (-270 ˚ C to -180 ˚ C):

Type E (-130 ˚ C to 1000 ˚ C):

Type E (-270 ˚ C to -130 ˚ C):

Type C (0 ˚ C to 2315 ˚ C):

Type B (600 ˚ C to 1800 ˚ C):

Type B (300 ˚ C to 600 ˚ C):

Type S (140 ˚ C to -1760 ˚ C):

Type S (0 ˚ C to 140 ˚ C):

Type R (280 ˚ C to -1760 ˚ C):

Type R (0 ˚ C to 280 ˚ C):

CJC accuracy

Voltage Accuracy with 4.17 Hz filter

Accuracy Accuracy

25°C 55°C

Repeatability

Limit

Filter Filter

± 0.6 °C ± 2.3 °C

± 0.8 °C ± 3.3 °C

± 1.0 °C ± 1.5 °C

± 1.2 °C ± 3.0 °C

± 1.0 °C ± 1.5 °C

± 5.4 °C ± 8.5 °C

Hz filter

± 0.17 °C

± 0.25 °C

± 0.3 °C

± 1.9 °C

± 0.2 °C

± 1.5 °C

± 1.0 °C ± 1.5°C ± 0.3 °C

± 7.5 °C ± 11.5 °C ± 3.6 °C

± 0.5 °C ± 1.5 °C ± 0.1°C

± 4.2 °C ± 7.3 °C

± 1.8 °C ± 3.5 °C

± 3.0 °C ± 4.0 °C

± 3.0 °C ± 8.0 °C

± 1.7 °C ± 2.6 °C

± 1.2 °C

± 0.9 °C

± 1°C

± 2°C

± 0.55 °C

± 1.7 °C ± 5.0 °C

± 1.7 °C ± 2.6 °C

± 1.7 °C ± 5.0 °C

± 1.0 °C 3.0 °C

± 1.0 °C

± 0.4 °C

± 1.0 °C

± 0.8 °C

Repeatability

Accuracy

°25C

Accuracy

°55C

Limit

At °25C & 4.17

Hz filter

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Appendix A: Module Specifications A-3

±50 mV range

±100 mV range

±20uV

±40uV

24V dc nom

±35uV

±60uV

240 mA @ 24V dc

94 x 94 x 69 mm

(3.7 x 3.7 x 2.7 in.)

±10uV

±13uV

Resistance Accuracy with 4.17 Hz filter

Accuracy

°25C

±0.15

Accuracy

°55C

Repeatability

Limit

At °25C & 4.17

Hz filter

0-150 ohms range

0-1000 ohms range

0-3000 ohms range

±1.0 ohms ±2.0 ohms ±100 milliohms

±1.5 ohms ±2.5 ohms ±100 milliohms

Accuracy

°C

Accuracy

°C

RTD Accuracy

With 4.17 Hz filters

Platinum 385 (100, 200, 500 and 1000 ohms) (IEC751 1983, Amend 2 1995;

JISC 1604 1997)

0°55C

Platinum 3916 (100, 200, 500 and 1000 ohms) (JISC 1604: 1981) ± 0.6 °C ± 1.1 °C

Nickel 618 (100 ohms) (DIN 43760

Sept. 1987) ± 0.3 °C ± 0.5 °C

Nickel 672(120 ohms) (DIN 43760

Sept. 1987) ± 0.3 °C ± 0.5 °C

Nickel-Iron (518) (MINCO Application

Aid #18,Date 5/90)

Copper 426 (10 ohms) (SAMA RC21-4-

1966)

°25C

± 0.7 °C ± 1.2 °C

± 0.4 °C

± 2.4 °C

± 0.7 °C

± 2.8 °C

Repeatability

Limit

Hz filter

± 0.1 °C

± 0.1 °C

± 0.1 °C

± 0.1 °C

± 0.1 °C

± 0.1 °C

General Specifications

Voltage range

Supply current

Dimensions (with module installed in base)

HxWxD approx.

Environmental Conditions

Temperature, operating

Temperature, storage

Relative humidity

Vibration

Shock

Operating

Non-operating

Emissions

ESD immunity

0…55 °C (-32…131 °F)

–40…85 °C (–40…185 °F)

IEC 60068-2-30

5…95% non-condensing

IEC60068-2-6:

5 g @ 10…500Hz

IEC60068-2-27:

20 g

25 g

IEC61000-6-4

CISPR 11:

Group 1, Class A (with appropriate enclosure)

IEC 61000-6-2:

6 kV contact discharges

8 kV air discharges

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A-4 Flex™ IO Isolated RTD/Thermocouple Module

Radiated RF immunity

EFT/B immunity

Surge transient immunity

Conducted RF immunity

Enclosure type rating

Signal conductors

Thermocouple

Millivolt

Category

7

Power conductors

Wire size Category

7

Terminal screw torque for cage-clamp terminal base

IEC 61000-6-2:

10 V/m with 1 kHz sine-wave 80% AM from

30…2000 MHz

10 V/m with 200 Hz 50% Pulse 100% AM at

900 MHz

10 V/m with 200 Hz 50% Pulse 100% AM at

1890 MHz

IEC 61000-6-2:

±2 kV at 5 kHz on signal ports

IEC 61000-6-2:

±2 kV line-earth (CM) on shielded ports

IEC 61000-6-4:

10V rms with 1 kHz sine-wave 80% AM from

150 kHz…80 MHz

None (open-style)

Use appropriate shielded thermocouple wire

8

Belden 8761 2 - on signal ports

0.34…2.5 mm2 (22…12 AWG) solid or stranded copper wire rated at 75 °C (167 °F) or greater

1.2 mm (3/64 in.) insulation max

3 - on power ports

0.8 Nm (7 lb-in.)

7

Use this category information for planning conductor routing as described in the Industrial Automation

Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1.

8

Refer to the thermocouple manufacturer for proper thermocouple extension wire.

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Certifications (when product is marked)

Appendix A: Module Specifications A-5

UL

Listed for Class I, Division 2 Group

A,B,C,D Hazardous

Locations, certified for U.S. and Canada. See

UL File

E180101.

UL

Listed Industrial Control Equipment, certified for U.S. and Canada. See UL File E140954.

EEx

European Union 94/9/EEC ATEX

Directive, compliant with:

EN 60079-15; Potentially Explosive

Atmospheres,

Protection “nA” (Zone 2)

CE

European Union 89/336/EEC EMC

Directive, compliant with:

EN 61000-6-4; Industrial Emissions

EN 61326; Meas./Control/Lab., Industrial

Requirements

EN 61000-6-2; Industrial Immunity

EN 61131-2; Programmable Controllers

(Clause 8, Zone A & B)

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A-6 Flex™ IO Isolated RTD/Thermocouple Module

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Index

1

 

1794 ‐ TB3G  ∙  2 ‐ 10  

1794 ‐ TB3GS  ∙  2 ‐ 10  

A

 

A/D   converter  ∙  1 ‐ 3  

B

 

Base   Unit  ∙  2 ‐ 3   block   diagram  ∙  1 ‐ 4  

Broken   Input   Alarm  ∙  3 ‐ 15  

Broken   Input   Mode  ∙  3 ‐ 12  

C

 

CJC  ∙  2 ‐ 12,   3 ‐ 12  

Configuration  ∙  3 ‐ 7  

D

 

Data   Format  ∙  1 ‐ 2,   3 ‐ 10  

Data   Ranges  ∙  3 ‐ 11  

Deadband  

User   Alarm   Deadband  ∙  3 ‐ 12  

Diagnostics  ∙  3 ‐ 16  

DIN   Rail  ∙  2 ‐ 5  

Drilling   Dimensions  ∙  2 ‐ 8  

E

 

EMC   Directive  ∙  2 ‐ 1  

Ethernet   Bridge  

Local  ∙  3 ‐ 3  

F

 

Fault   Mode  ∙  3 ‐ 9  

Filter   Frequencies  ∙  1 ‐ 2  

G

 

Generic   Profile  ∙  3 ‐ 2  

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H

 

Hazardous   Location  ∙  2 ‐ 2  

I

 

Input   Data  ∙  3 ‐ 15  

Input   Filter  ∙  3 ‐ 10  

Input   Type  ∙  1 ‐ 1,   3 ‐ 9  

Installation  ∙  2 ‐ 5  

K

 

key ‐ switch  ∙  1 ‐ 3,   2 ‐ 15  

L

 

LED  

Module   Status  ∙  2 ‐ 15  

Low   Voltage   Directive  ∙  2 ‐ 1  

M

 

Memory   Map  ∙  3 ‐ 1  

N

 

Noise  ∙  2 ‐ 3  

O

 

Over   Range  ∙  3 ‐ 15  

P

 

Panel/Wall   Mounting  ∙  2 ‐ 7  

Power   Requirements  ∙  2 ‐ 3   power ‐ up  ∙  1 ‐ 3  

R

 

Read  

Input   data  ∙  3 ‐ 13  

Remote   Ethernet  

Ethernet   Flex   Adapter  ∙  3 ‐ 4  

S

 

Slot   Number  ∙  3 ‐ 8,   3 ‐ 13  

T

 

Temperature   Units  ∙  3 ‐ 12  

U

 

Under   Range  ∙  3 ‐ 15  

User   High   Alarm  ∙  3 ‐ 12,   3 ‐ 15  

User   Low   Alarm  ∙  3 ‐ 12,   3 ‐ 15  

W

 

Wiring  ∙  2 ‐ 10  

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Getting Technical

Assistance

Note that your module contains electronic components which are susceptible to damage from electrostatic discharge (ESD). An electrostatic charge can accumulate on the surface of ordinary plastic wrapping or cushioning material

. In the unlikely event that the module should need to be returned to Spectrum Controls, please ensure that the unit is enclosed in approved ESD packaging (such as static-shielding / metalized bag or black conductive container).

Spectrum Controls reserves the right to void the warranty on any unit that is improperly packaged for shipment.

RMA (Return Merchandise Authorization) form required for all product returns.

For further information or assistance, please contact your local distributor, or call the

Spectrum Controls technical Support at:

USA - 425-746-9481

Declaration of

Conformity

Available upon request

User's   Manual   Pub.

  0300242 ‐ 01   Rev.

  A

©2009, Spectrum Controls, Inc. All rights reserved. Specifications subject to change without notice.

The Encompass logo and ControlLogix are trademarks of Rockwell Automation.

Corporate Headquarters

Spectrum Controls Inc.

P.O. Box 5533

Bellevue, WA 98006 USA

Fax: 425-641-9473

Tel: 425-746-9481

Web Site: www.spectrumcontrols.com

E-mail: [email protected]

User's   Manual   Pub.

  0300242 ‐ 01   Rev.

  A