The 1756-RM is a hardware redundancy module designed for Rockwell's Allen-Bradley ControlLogix PLC systems.

What is the primary purpose of the 1756-RM?

Its core purpose is to provide fault tolerance protection in critical industrial processes.

Which category of automation hardware does the 1756-RM belong to?

The Allen-Bradley 1756-RM is a hardware redundancy synchronization module specialized for ControlLogix PLC systems, achieving millisecond-level seamless switchover via fiber-optic links to ensure zero downtime in critical industrial processes.

How do you use the 1756-RM within a ControlLogix system?

You need to prepare two identical chassis and insert one 1756-RM module into each. Then, connect the two modules using a 1756-RMC fiber-optic cable. Once redundancy is enabled in the Studio 5000 software, the modules will automatically synchronize data between the primary and secondary systems.

Does the 1756-RM module require standalone ladder logic programming?

No. The 1756-RM is a pure hardware-level synchronization and switchover module, with its underlying logic controlled by Rockwell system firmware. Engineers only need to check the redundancy enablement in the controller properties without writing specific switchover code.

1756-RM

Name: 1756-RM
Brand: Allen-Bradley
SKU: 1756-RM

Analog Input Module

Allen-Bradley 1756-RM redundancy module, angled side view with nameplate and front hood labeled REDUNDANCY MODULE

Allen-Bradley 1756-RM module, angled view of black housing with green circuit board edge, two screws and black connector

Allen-Bradley 1756-RM close-up of redundancy module nameplate, catalog 1756-RM B, firmware 1.021, 1.20A at 5.1VDC

Product image is representative; revision or series may vary. Contact us to request a specific version.

Product Describe：

Analog Input Module
Zero-downtime critical process automation
Seamless millisecond-level backup switchover
CSA, CE, Ex, C-Tick, c-UL-us, FM and KC

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Technical specifications for 1756-RM

Manufacturer:

Allen-Bradley
Product Category:

PLC Systems
Spare Part Number:

1756-RM
Estimated shipping dimensions:

3.5x14x17cm
Weight:

0.3 kg
Tariff Code:

8537101190
Counliy of origin:

USA
Certifications:

UL, c-UL-us, CSA, CE, Ex, C-Tick, FM, KC
Current draw at 1.2 Volts DC:

4 milli Amps
Current draw at 5.1 Volts DC:

1.2 Amps
Current draw at 24 Volts DC:

120 milli Amps
Mounting:

Chassis-based, any slot
Power dissipation:

9 Watts
Storage temperature:

-40 to 85 degrees Celsius
IEC temperature code:

T4
Compatible redundanc Power supply:

1756-PA75R, 1756-PB75R, 1756-PSCA2

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Information

Overview Manuals Common Applications Product Precautions

The 1756-RM introduced by Rockwell Automation under the Allen-Bradley brand, is an enhanced redundancy control unit for ControlLogix systems that plays a critical role in executing controller-level redundancy architectures. To guarantee absolute real-time data synchronization, the module is equipped with an LC-type single-mode fiber optic connector.

Achieves 100 Mbps data mirroring via a dedicated LC fiber-optic connection
Works seamlessly with a wide array of chassis configurations and controllers
Certified under numerous global standards for safety and reliability

1756-RM is configured with one (1) factory single-mode LC fiber optic connector to execute high-speed underlying backplane communication through a dedicated high-bandwidth fiber optic patch cord, maintaining real-time data cross-loading and mirror synchronization between the primary and backup controller chassis. For operational status monitoring, the front faceplate compactly integrates multi-status LED diagnostic indicators, including PRI (Primary), COM (Communication), and OK, which provide a direct visual assessment of the overall health of the system redundancy, fiber link continuity, and the functional state of the hardware itself without accessing upper-level software.

Acting as a coordinator in a redundant architecture, hot-swapping this module while the redundancy synchronization is active is strictly prohibited, and single-mode fiber installations must adhere strictly to bend radius standards to guarantee seamless millisecond-level switchovers during single-point failures.

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.

Allen Bradley 1756-RM Analog Input Module Manuals, Datasheets, Drivers, Link

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.

Oil & Gas Upstream Extraction

Used in Emergency Shutdown Systems (ESD) for offshore drilling platforms and onshore oil/gas wellheads, ensuring zero-interruption operation of the redundant control system to execute safety protection during sudden well kicks.

Petroleum Refining & Petrochemicals

Used for continuous process control of ethylene cracking furnaces, distillation columns, and reactors, preventing runaway chemical reactions or unplanned plant-wide shutdowns caused by primary controller failures.

Thermal & Nuclear Power Generation

Used in Boiler Management Systems (BMS) and Digital Electro-Hydraulic (DEH) control systems for steam turbines, securing the operational continuity of critical generator units tied to the grid and maintaining busbar voltage stability.

Mining & Bulk Material Conveying

Used for synchronized control of large underground mine hoists and multi-kilometer heavy-duty overland belt conveyor clusters, preventing belt tearing from heavy-load shutdowns while the backup chassis stands ready.

Pharmaceuticals & Biological Vaccine Production

Used for centralized control of long-cycle processes in bioreactors and constant-temperature fermenters, safeguarding data integrity throughout multi-month fermentation cycles to prevent entire batches of costly medicine from being scrapped due to system downtime.

First, the hardware models and firmware versions (Redundancy Bundle) of the 1756-RM, CPUs, and all communication modules in both chassis must be identical and installed in perfectly symmetrical slots; otherwise, the system will fail to establish data synchronization.

Second, you must use the officially designated 1756-RMC fiber-optic cables and ensure the LC connectors are clean and dust-free with no excessive bending to prevent signal attenuation from causing sync loss.

Lastly, before performing hot-swapping (RIUP) or triggering a manual switchover, verify that the partner chassis is in a perfect "Synchronized" state to prevent accidental production line shutdowns caused by operating during a system fault or lost synchronization.

Revisions

Revision Part #

Also known as

1756-RM Ser A

1756-RM/A, Series A, Rev A

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1756-RM Ser B

1756-RM/B, Series B, Rev B

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Alternative Names

1756RM I756-RM I756RM

Technical notes

The 1756-RM, introduced under the Allen-Bradley brand by Rockwell Automation, is a chassis-mounted redundancy module for ControlLogix systems utilized extensively throughout demanding industrial operations. The electrical parameters of this hardware are precisely defined, with its current consumption strictly limited to 4 mA at 1.2 VDC, 1.2 A at 5.1 VDC, and 120 mA at 24 VDC. In terms of physical construction, the module offers a significant lightweight advantage, with a total physical weight of just 0.29 kg (0.64 lbs), facilitating rapid deployment on control cabinet chassis in the field.

FAQ View All FAQ

What is the 1756-RM?

The 1756-RM is a hardware redundancy module designed for Rockwell's Allen-Bradley ControlLogix PLC systems.
What is the primary purpose of the 1756-RM?

Its core purpose is to provide fault tolerance protection in critical industrial processes.
Which category of automation hardware does the 1756-RM belong to?

The Allen-Bradley 1756-RM is a hardware redundancy synchronization module specialized for ControlLogix PLC systems, achieving millisecond-level seamless switchover via fiber-optic links to ensure zero downtime in critical industrial processes.

How do you use the 1756-RM within a ControlLogix system?

You need to prepare two identical chassis and insert one 1756-RM module into each. Then, connect the two modules using a 1756-RMC fiber-optic cable. Once redundancy is enabled in the Studio 5000 software, the modules will automatically synchronize data between the primary and secondary systems.
Does the 1756-RM module require standalone ladder logic programming?

No. The 1756-RM is a pure hardware-level synchronization and switchover module, with its underlying logic controlled by Rockwell system firmware. Engineers only need to check the redundancy enablement in the controller properties without writing specific switchover code.

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