Wiring; Wiring With 1492 Analog Interface Modules - Allen-Bradley 1756 Reference Manual

Chapter 1

Replacement Considerations

8

While this document covers the ease of replacement from a 6- to 8- channel

module from a programming standpoint a user must still make changes to the

physical system due to differences across all modules RTBs.

The 8-channel modules use different RTBs than their predecessors. This

means that the wiring and terminals used are different across the various

modules. There are various 1492 wiring solutions available for the 8-channel

modules.

If your existing 6-channel application is already wired using a 1492-AIFMxxx

interface module, then you may be able to convert to a new analog module by

replacing the 1492 cable.

For example, if you have an existing application with a 1756-IF6I module used

in Voltage mode that is wired with 1492 products, you would be using a

1492-AIFM6S-3 terminal block. Attached to the terminal block, you would

have a 1492-ACABLExxxY cable. You could replace the 1756-IF6I module

with a 1756-IF8I module, keep all wires intact to the 1492-AIFM6S-3

terminal block, remove the 1492-ACABLExxxY cable, and replace it with a

1492-ACABLExxxYB cable. The new cable is configured to adjust the current

6-channel field wiring into the appropriate terminals on the new 8-channel

module. Then you would be finished with minimal cost and effort.

Table 1

shows available 1492 catalog numbers for 8-channel analog modules

used in existing 6-channel applications that are already using a 1492-AIFMxxx

terminal block.

Table 1 - Backwards Compatible 8-Channel Analog Matrix (New PLC Card to Old IFM)

Current 6-Channel I/O Card

1756-IF61

Current

1756-OF6CI

Current

1756-IF61

Voltage

1756-OF6CI

Voltage

1756-IT6I

Thermocouple

1756-IT6I2

Thermocouple

1756-IF6CIS

Internal Loop Power

1756-IF6CIS

External Loop Power

1756-IR6I

RTD

(1) Add the appropriate length code to the end of the cable catalog number. The choices include 0.5 M cable with that catalog

number 005, 1.0 M cable (010), 2.5 M cable (025), and 5.0 M cable (050). Custom Length cables are also available on

www.ab.com.

Rockwell Automation Publication 1756-RM011A-EN-P - June 2016

New 8-Channel

Current 6-Channel

I/O Card

IFM

1756-IF8I

1492-AIFM6S-3

1756-OF8I

1492-AIFM6S-3

1756-IF8I

1492-AIFM6S-3

1756-OF8I

1492-AIFM6S-3

1756-IR8TI

1492-AIFM6TC-3

1756-IR8TI

1492-AIFM6TC-3

1756-IF8I

1492-AIFM6S-3

1756-IF8I

1492-AIFM6S-3

1756-IR8TI

1492-AIFM6S-3

New Cable Catalog

(1)

Number

1492-ACABLExxxYA

1492-ACABLExxxYB

1492-ACABLExxxYC

1492-ACABLExxxYD

1492-ACABLExxxYE

1492-ACABLExxxYF