8 Rockwell Automation Publication 1756-RM011A-EN-P - June 2016
Chapter 1 Replacement Considerations
Wiring
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.
Wiring with 1492 Analog Interface Modules
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.
Tab le 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 New 8-Channel
I/O Card
Current 6-Channel
IFM
New Cable Catalog
Number
(1)
(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
.
1756-IF61 Current 1756-IF8I 1492-AIFM6S-3 1492-ACABLExxxYA
1756-OF6CI Current 1756-OF8I 1492-AIFM6S-3
1756-IF61 Voltage 1756-IF8I 1492-AIFM6S-3 1492-ACABLExxxYB
1756-OF6CI Voltage 1756-OF8I 1492-AIFM6S-3
1756-IT6I Thermocouple 1756-IR8TI 1492-AIFM6TC-3 1492-ACABLExxxYC
1756-IT6I2 Thermocouple 1756-IR8TI 1492-AIFM6TC-3
1756-IF6CIS Internal Loop Power 1756-IF8I 1492-AIFM6S-3 1492-ACABLExxxYD
1756-IF6CIS External Loop Power 1756-IF8I 1492-AIFM6S-3 1492-ACABLExxxYE
1756-IR6I RTD 1756-IR8TI 1492-AIFM6S-3 1492-ACABLExxxYF
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