Allen-Bradley 1794-IT8 Bedienungsanleitung

English

FLEX I/O is a trademark of Rockwell Automation

Publication

1794-5.21 – May 1999

24V dc FLEX I/O

Thermocouple/mV Input Module

(Cat. No. 1794-IT8)

Module

Installation

This module mounts on a 1794 terminal base unit.

1.Rotate keyswitch (1) on terminal base unit (2) clockwise to position 3

as required for this type of 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.

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.

Installation Instructions

Allen-Bradley Parts

24V dc FLEX I/O Thermocouple/mV Input Module2

Publication

1794-5.21 – May 1999

!ATTENTION: Remove field-side power before

removing or inserting this 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.

European Union Directive Compliance

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

Environment

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

Environment

This product is intended for use in an industrial environment.

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

•Automation Systems Catalog, publication B111

This equipment is classified as open equipment and must be mounted in

an enclosure during operation to provide safety protection.

24V dc FLEX I/O Thermocouple/mV Input Module 3

Publication

1794-5.21 – May 1999

Wiring

1. Connect the individual high and low signal wiring to numbered

terminals on the 0–15 row (A) on the terminal base unit as indicated

in the wiring table.

2. Connect 24V dc common to terminal 16 on row (B).

!ATTENTION: You must power this module from the same

power supply that supplies the adapter module so they both

power up or down together. You must cycle power for the

adapter to recognize this module.

3. Connect individual channel shield returns to the associated terminal

on row (B) for 1794-TB3 and -TB3S or row (C) for the 1794-TB3T or

-TB3TS as shown in the wiring table.

4. Connect +24V dc to terminal 34 on the 34-51 row (C).

ATTENTION: To reduce susceptibility to noise, power

analog modules and digital modules from separate power

supplies. Do not exceed a length of 33 ft (10m) for dc

power cabling.

!ATTENTION: Do not daisy chain power or ground from the

thermocouple terminal base unit to any ac or dc discrete

module terminal base units.

5. On 1794–TB3T or –TB3TS terminal bases, connect cold junction

compensation (CJC) wiring to terminals 36, 37 and 38 for inputs 0–3,

and terminals 47, 48 and 49 for inputs 4–7.

Connect the tail of the cold junction compensator to any of the

associated thermocouple input terminals: 0 through 7 for CJC

connected to terminals 37, 38 and 39; or 8 through 15 for CJC

connected to terminals 47, 48 and 49. The tail of the cold junction

compensator shares a terminal with an input.

6. If daisy-chaining 24V dc common, connect jumper from terminal 33

to terminal 16 on the next terminal base unit.

7. If daisy-chaining +24V dc, connect jumper from terminal 51 to

terminal 34 on the next terminal base unit.

Allen-Bradley Parts

24V dc FLEX I/O Thermocouple/mV Input Module4

Publication

1794-5.21 – May 1999

8. Connect the shield to functional earth ground as near as possible to

the module.

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

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

1234567891011121314150

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

1794-TB2, TB3, -TB3T

–15

34–51

16–33 A

Shaded terminals not included on 1794-TB2 terminal base unit.

Note: Use 1794-TB3T or -TB3TS base units for thermocouple or millivolt inputs

Use 1794-TB2 or -TB3 base units for millivolt inputs only.

ATTENTION: Total current draw through the terminal

base unit is limited to 10A. Separate power connections to

the terminal base unit may be necessary.

Millivolt Mode

1794-TB2, -TB3, -TB3S T

erminal Base Units

Millivolt Mode

Channel High Signal

erm. (+)

Low Signal

erm. (–)

Shield Return

Not Used

0 0 1 17 18

1 2 3 19 20

2 4 5 21 22

3 6 7 23 24

4 8 9 25 26

5 10 11 27 28

6 12 13 29 30

7 14 15 31 32

24V

dc Common

16 thru 33

+24V dc power

34 and 51 on 1794-TB2; 34 thru 51 on 1794-TB3

24V dc FLEX I/O Thermocouple/mV Input Module 5

Publication

1794-5.21 – May 1999

Thermocouple

1794-TB3T or -TB3TS T

erminal Base Unit

Thermocouple

Channel High Signal

erm. (+)

Low Signal

erm. (–)

Not Used

Shield

Return

0 0 1 17(C) 39

1 2 3 19(C) 40

2 4 5 21(C) 41

3 6 7 23(C) 42

4 8 9 25(C) 43

5 10 11 27(C) 44

6 12 13 29(C) 45

7 14 15 31(C) 46

24V

dc Common

16, 17, 19, 21, 23, 25, 27, 29, 31 and 33

+24V dc power

34, 35, 50 and 51

erminals 39 to 46 are chassis ground.

erminals 36, 37, 38 and 47, 48, 49 are for cold junction compensators only

Example

of Thermocouple W

iring to 1794-TB3T Base Unit

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

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

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

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

1794-TB3T

–15

34–51

16–33

–

Channel 0 (T

erminals 0 and 1 with shield to 39)

CJC CJC

CJC

kit Cat. No. 1794–CJC2/A

(contains 2 CJCs)

Allen-Bradley Parts

24V dc FLEX I/O Thermocouple/mV Input Module6

Publication

1794-5.21 – May 1999

Example

of Millivolt Input W

iring to a 1794-TB3 or -TB3T Base Unit

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

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

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

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

1794-TB3

–15

34–51

16–33

–

Millivolt input

Channel 1

Millivolt

Source

Channel 0 (T

erminals 0, 1 and 17)

Indicators

INPUT

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

THERMOCOUPLE

INPUT 8 CHANNEL

1794–IT8

Allen-Bradley

+– +– +– +–+– +–+–+–

A= Status Indicator – indicates diagnostics results and

configuration status.

B= Insertable label for writing individual input designations.

24V dc FLEX I/O Thermocouple/mV Input Module 7

Publication

1794-5.21 – May 1999

Block

ransfer Read and W

rite

The following block transfer read and write word bit information is

presented for experienced users only. Refer to the user manual

(publication 1794-6.5.7)for this product for complete information on

programming and configuring your module.

Input Mapping

Bit⇒1

514 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Word

⇓Read

0 Reserved

1 Channel

0 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 Input Data

Overrange Bits

Underrange Bits

10 0 0 0 0 0 Bad

Cal Cal

Done Cal

gRIUP Diagnostic

Status Bits

Pwr

Up Bad

Struct CJC

over CJC

Under

Output

Mapping

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

Word⇓Write

0 8-bit

Calibration Mask

Cal

Clk Cal

Hi/Lo

Filter Cutof

f FDF Module

Data

Type

Thermocouple 3 T

ype

Tfhermocouple 2 T

ype

Thermocouple 1 T

ype

Thermocouple 0 T

ype

Thermocouple 7 T

ype

Thermocouple 6 T

ype

Thermocouple 5 T

ype

Thermcouple 4 T

ype

3 Reserved

Where:

FDF = fixed digital filter

Allen-Bradley Parts

24V dc FLEX I/O Thermocouple/mV Input Module8

Publication

1794-5.21 – May 1999

Thermocouple

ype

Word Description

Thermocouple T

ype – Range

Write

ord 1

Bit 03 02 01 00

Channel 0

ord 1

Bit 07 06 05 04

Channel 1

Bit 11 10 09 08

Channel 2

Bit 15 14 13 12

Channel 3

Write

ord 2

Bit 03 02 01 00

Channel 4

ord 2

Bit 07 06 05 04

Channel 5

Bit 11 10 09 08

Channel 6

Bit 15 14 13 12

Channel 7

0 0 0 0 Millivolts (default)

0 0 0 1 B

300 to 1800

(572 to 3272

oF)

0 0 1 0 E

–270 to 1000

(–454 to 1832

oF)

0 0 1 1 J

–210 to 1200

(–346 to 2192

oF)

0 1 0 0 K

–270 to 1372

(–454 to 2502

oF)

0 1 0 1 R

–50 to 1768

(–58 to 3214

oF)

0 1 1 0 S

–50 to 1768

(–58 to 3214

oF)

0 1 1 1 T

–270 to 400

(–454 to 752

oF)

1 0 0 0 C

0 to 2315

(32 to 4199

oF)

1 0 0 1 N

–270 to 1300

(–454 to 2372

oF)

1 0 1 0

TXK/XK (L) –200 to 800

C (–328 to 1472

oF)

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)

24V dc FLEX I/O Thermocouple/mV Input Module 9

Publication

1794-5.21 – May 1999

Data

ype

Word Description

Write

Word

Module Data T

ype

ord 0

Bit 01 00 Definition

0 0 o

C (default)

0 1 oF

1 0

Bipolar counts scaled between –32768 and

+32767 (default)

1 1

Unipolar counts scaled between 0 and 65535

Allen-Bradley Parts

24V dc FLEX I/O Thermocouple/mV Input Module10

Publication

1794-5.21 – May 1999

CSA Hazardous Location Approval

CSA

certifies products for general use as well as for use in hazardous locations.

Actual

CSA certification is indicated by the product label

as shown below

, and not by

statements in any user documentation.

Example of the CSA certification product label

comply with CSA certification for use in hazardous locations, the following information

becomes a part of the product literature for CSA-certified Allen-Bradley industrial control

products.

•This equipment is suitable for use in Class I, Division 2,

Groups A, B, C, D, or non-hazardous locations only

•

The products having the appropriate CSA markings (that is, Class I Division 2, Groups

A, B, C, D), are certified for use in other equipment where the suitability of combination

(that is, application or use) is determined by the CSA or the local inspection of

fice

having jurisdiction.

Important:

Due to the modular nature of a PLC



control system, the product with the

highest temperature rating determines the overall temperature code rating of a PLC

control system in a Class I, Division 2 location. The temperature code rating is marked on

the product label as shown.

erature code rating

Look for temperature code

rating here

The

following warnings apply to products having CSA certification for use in hazardous

locations.

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