AB PLC-5 1771 to ControlLogix 1756 I/O Wiring Conversion Systems

AB PLC-5 1771 to ControlLogix 1756 I/O Wiring Conversion Systems

Product Overview:This document is a selection guide for the AB I/O Wiring Conversion System for converting PLC-5 1771 I/O to 

ControlLogix 1756 I/O without removing field wires, reducing the risk of wiring errors. 

The system includes conversion modules, cables, and conversion mounting components.

Product Selection:

Conversion Mounting Kit Selection: To determine the number of 1771 I/O modules, refer to the table to select the appropriate 1492 conversion module, 

1756 I/O chassis, and conversion mounting kit, noting the maximum number of slots and chassis width for each kit. 

For example, the maximum number of I/O slots for 1771-A1B chassis without power supply is 4, the maximum number of I/O slots for 1756-A4 chassis is 3, 

and the maximum number of converter module slots for 1492-MUA1B-A4-A7 conversion mounting assembly is 4.

I/O Module Selection: When selecting digital, analogue, and high-resolution isolated analogue I/O modules, 

it is necessary to find the corresponding 1756-compatible module, converter module, and converter cable type according to the 1771 module type. 

For example, if 1771-IA is converted to 1756-IA16, the conversion module is 1492-CM1771-LD007 and the conversion cable is 1492-C005005XE. 

The specific selection information is shown in the following table:

| Module Types | 1771 Modules | 1756 Modules | Conversion Modules | Conversion Cables |

|---|---|---|---|---|---|

| Digital Inputs | 1771-IA| 1756-IA16| 1492-CM1771-LD007| 1492-C005005XE|

| Digital Output | 1771-OA|1756-OA8E|1492-CM1771-LD014|1492-CONACAB005U|

| Analogue Input | 1771-IFE (differential current)| 1756-IF16|1492-CM1771-LA002|1492-CONACAB005D|

| Analogue Output | 1771-OFE1 (Voltage)| 1756-OF6VI| 1492-CM1771-LA003| 1492-CONACAB005E|

| High Resolution Isolated Analogue | 1771-NOC|1756-OF8I| - |1492-CONACAB020N88 etc |

Outline Dimensions: The document gives approximate dimensions in inches and millimetres for different conversion mounting assemblies in combination 

with the 1756 chassis, including dimensions in inches and millimetres for left-aligned, right-aligned, and centred mounting, 

to facilitate the design of mounting layouts.

Wiring Diagrams:

Digital Inputs: Provides wiring diagrams for converting a variety of 1771 digital input modules to 1756 modules, 

detailing pin-by-pin connections and pointing out application considerations such as input delay times, voltage levels, and more.

Digital Outputs: Shows wiring diagrams for converting 1771 digital output modules to 1756 modules, along with key information such as output current limits, 

fuse configurations, and more.

Analogue Inputs and Outputs: Covers wiring diagrams for converting 1771 analogue input and output modules, highlighting key points such as shield grounding,

input and output range configurations, etc.

High Resolution Isolated Analogue: For 1771 high resolution isolated analogue I/O module conversions, wiring diagrams are provided for different connection 

scenarios and related considerations.

Technical Support and Feedback: Provides resources such as a technical support centre, local technical support phone numbers, direct dial codes, 

a literature library, product compatibility and a download centre; also gives ways to provide feedback on documentation, 

a specific form for submitting suggestions, and access to product environmental information on the website.

Key Question:

How do I select the right conversion installation components?

Answer: Determine the number of each type of I/O module in the 1771 I/O chassis, then select the appropriate 1492 conversion module from the table, 

and refer to the maximum number of I/O slots, chassis width, etc. to select a 1756 I/O chassis with enough I/O slots and a conversion mounting kit 

with enough slots for conversion modules.

What are the key considerations when converting a 1771-IA module to a 1756-IA16 module?

Answer: Conversion module 1492-CM1771-LD007 and conversion cable 1492-C005005XE are required; 

1771-IA module input delays are 24ms (±10ms) on-off, 24ms (±10ms) off-on, 

1756-IA16 module is 10ms max on-off (with optional filter) when using this conversion cable. 

The 1756-IA16 module is rated for 87V - 138V AC and 97V - 138V DC, the 1771-IA module is rated for 79V - 132V AC only.

Wire-free conversion: The I/O conversion process eliminates the need to remove any field wires from the existing swing arm. 

The conversion module adapts directly to the existing swing arm and transmits the I/O signals to the 1756 I/O module via the conversion module and cables, 

which greatly reduces the risk of wiring errors, reduces the number of failures caused by wiring errors during system upgrades, 

and improves conversion efficiency and stability.

Pre-wired design: The cables in the system are pre-wired, with one end connecting to the converter module and the other end being 

a removable terminal block (RTB). This design simplifies the installation process, saves installation time, 

reduces labour costs, reduces problems caused by improper wiring on site, and improves overall system reliability.