Rockwell-automation 1794-IRT8XT/B TC/MV/RTD Input Module Installation Instrukcja Użytkownika Pobierz pdf (Strona 3)

Publication 1794-IN050J-EN-P - January 2009

Identify RTD Wire Pairs

If the RTD wires are color-coded, the wires that are the same color are

connected together. If the wires are not color-coded, use an ohmmeter to

determine the pairs as explained below.

How to Connect a 4-wire RTD

If the 4-wire RTD wires are all different colors, use an ohmmeter to

determine which leads are connected together. One of the leads in each

pair is the compensation lead. Either lead of the pair can be the

compensation lead. Attach one pair to terminals L and - and the other pair

to + and H.

How to Connect a 3-wire RTD

If the 3-wire RTD wires are all different colors, use an ohmmeter to

determine which leads are connected together. Either lead of the pair can

be the compensation lead. Attach one lead of the pair to terminal L and

the other to +. Attach the single lead to -.

Refer to the following table.

Wire Connections for the Thermocouple/RTD Module

Terminal Base Unit Wiring Connections

Example of RTD and Thermocouple Wiring to a 1794-TB3G Terminal Base

Unit

Example of Millivolt Wiring to a 1794-TB3G Terminal Base Unit

Block Transfer Read and Write

The following block transfer read and write word bit information is

presented for experienced users only. Refer to the user manual, publication

1794-UM012, for complete information on programming and configuring

your module.

Input Map (Read)

RTD

or TC

Channel

1794-TB3G, 1794-TB3GK, and 1794-TB3GS Terminal Base Units

High Signal

Terminal (H)

Low Signal

Terminal (L)

RTD Source

Current (+)

Signal

Return (-)

0 A-1 A-2 A-0 A-3

1 A-5 A-6 A-4 A-7

2 A-9 A-10 A-8 A-11

3 A-13 A-14 A-12 A-15

4 B-18 B-19 B-17 B-20

5 B-22 B-23 B-21 B-24

6 B-26 B-27 B-25 B-28

7 B-30 B-31 B-29 B-32

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

2-wire

3-wire

4-wire

Thermocouple

Millivolt

RTD

Type of Input Connect The Following

HL +-

Shield

RTD - 2-wire 1 2

RTD - 3-wire 3 1 2

RTD - 4-wire 1a 2a 1 2

Thermocouple 1 2

Millivolt 1 2

1 Shield can be connected to chassis ground terminals

16, 33, and 40…45.

Wire Number

Numbers 1, 1a, 2, 2a, and 3 are wire numbers of the sensor

used. For terminal numbers corresponding to H, L, +, -, refer to

Terminal Base Unit Wiring Connections below.

Input CJC Sensor

+ Chassis

Ground

- CJC

Tail

(1)

CJC1 C-37 C-38 C-39 A-5

(B-22)

CJC2 C-46 C-47 C-48 A-12

(B-29)

1 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 CJC1 to terminal 5 and CJC2 to terminal 12 if

channels 0…3 or 0…7 are configured for thermocouples.

Connect the tail of CJC1 to terminal 22 and CJC2 to 29 if channels

4…7 are configured for thermocouples.

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

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

Word 0 Channel 0 Input Data

Word 1 Channel 1 Input Data

Word 2 Channel 2 Input Data

Word 3 Channel 3 Input Data

Word 4 Channel 4 Input Data

Word 5 Channel 5 Input Data

Word 6 Channel 6 Input Data

Word 7 Channel 7 Input Data

Word 8 Overrange Alarm Bits (channel 0 = bit 8, etc.) Underrange Alarm Bits (channel 0 = bit 0, etc.

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

0123456789 10 11 12 13 14 15

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

Channel 0 Channel 1

24V dc

Supply

Gnd Gnd

24V dc

Supply

Out

+V COM +V COM

6 Chassis

Ground

for Shields

Connections for terminal Base 1794-TB3G shown

Chassis GndChassis Gnd

HL +

Channel 2 Channel 3

Channel 4 Channel 5

HL +

Channel 6 Channel 7

CJC CJC

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

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-TB3G

0…15

34…51

16…33

4-W ir e RTD Channel 3

2-W ir e RTD Channel 1

3-W ir e RTD Channel 2

Attention: Keep exposed area of inner conductor as short as possible.

CJC

Thermocouple Channel 4

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-TB3G

0 …15

34…51

16…33

Millivolt

Source

Millivolt

Source

Millivolt

Source

Millivolt

Source

Attention: Keep exposed area of inner conductor as short as possible

1 2 3 4 5 6

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