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Connect wiring to the field wiring arm – Rockwell Automation 1771-IXHR INSTL INSTR HI RES TC/MV INPUT User Manual

Page 5

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High Resolution Thermocouple/Millivolt Input Module

5

Publication 1771-5.66 – October 1998

Connect your I/O devices to the field wiring arm (cat. no. 1771-WI)
shipped with the module.

!

ATTENTION: Remove power from the 1771 I/O
chassis backplane and field wiring arm before
removing or installing an I/O module.

Failure to remove power from the backplane or
wiring arm could cause module damage, degradation
of performance, or injury.

Failure to remove power from the backplane could
cause injury or equipment damage due to possible
unexpected operation.

1

Short circuit
unused pins

Channel 1

Channel 2

18

Input 1 (+ lead)

17

Input 1 (– lead)

16

Input 2 (+ lead)

15

Input 2 (– lead)

14

Input 3 (+ lead)

13

Input 3 (– lead)

12

Input 4 (+ lead)

11

Input 4 (– lead)

10

Not Used

9

Not used

8

Input 5 (+ lead)

7

Input 5 (– lead)

6

Input 6 (+ lead)

5

Input 6 (– lead)

4

Input 7 (+ lead)

3

Input 7 (– lead)

2

Input 8 (+ lead)

1

Input 8 (– lead)

Terminal Identification

Terminal

Function

Field Wiring Arm

Cat. No. 1771–WI

18

17

16

1

15

14

13

12

11
10

9

8

7

6
5

4
3

2

10527–I

Connection Diagram for the High Resolution Thermocouple/mV Input
Module (cat. no. 1771-IXHR/D)

+

+

Do not use 9 and 10 – reserved for cold junction
compensation within wiring arm.

Short circuit all unused channels by
connecting a jumper wire from the
+ terminal to the – terminal

Connect positive thermocouple leads
to even–numbered terminals, negative
leads to odd–numbered terminals.

Ground cable shield to I/O chassis
mounting bolt.

The sensor cable must be shielded. The shield must:

extend the length of the cable, but be connected only at the 1771 I/O chassis

extend up to the point of termination

Important:

The shield should extend to the termination point, exposing just enough cable to
adequately terminate the inner conductors. Use heat shrink or another suitable
insulation where the wire exits the cable jacket.

Functional

Ground

Functional

Ground

Connect Wiring to the
Field Wiring Arm