ControlLogix | Allen-Bradley | 1756-RM2 SER A ControlLogix Redundancy Enhanced Module AB 1756RM2

Product Description: Allen-Bradley 1756-RM2

The Allen-Bradley 1756-RM2 is a ControlLogix redundancy module that enables high availability in mission-critical applications by allowing two ControlLogix controllers to operate in a redundant pair. This module uses high-speed fiber optic communication to synchronize data between the primary and secondary chassis, ensuring uninterrupted control in the event of a failure. The RM2 version supports redundancy over distances up to 10 kilometers using SFP transceivers.

Key Features

• Supports controller redundancy for ControlLogix systems
• Fiber optic communication between primary and secondary chassis
• Uses Small Form-factor Pluggable (SFP) modules for flexible fiber options
• Enables bumpless switchover during primary controller failure
• Compatible with Logix 5000 controllers and Studio 5000 software
• Supports redundancy over long distances (up to 10 km)
• Enhanced synchronization and status diagnostics

Technical Specifications

• Communication Type: Fiber optic via SFP transceivers
• Redundancy Support: Primary–Secondary controller synchronization
• Synchronization Rate: ≤20 ms (typical)
• Distance Support: Up to 10 km (with appropriate SFP modules and fiber cables)
• Slot Width: 1 ControlLogix chassis slot
• Mounting: ControlLogix chassis (any standard slot)
• Power Consumption: Approx. 5.6W
• Operating Temperature: 0°C to 60°C
• Compatible Software: Studio 5000 Logix Designer v20 and later
• Required Modules: One per chassis in a redundant pair

Application Areas

• Process automation with high- availability requirements
• Oil and gas pipeline monitoring
• Pharmaceutical production
• Power generation and distribution control
• Water and wastewater treatment facilities
• Any system requiring controller failover and minimized downtime

Advantages

• Provides seamless redundancy for critical systems
• Reduces risk of process interruption and production loss
• Flexible fiber distance allows remote redundancy architectures
• Diagnostic LEDs and software tools simplify setup and monitoring
• Proven solution for industrial high-availability automation needs