Allen Bradley 1756-RM2 Enhanced Redundancy Module
The AB 1756-RM2 is an enhanced redundancy module for the ControlLogix system, enabling high availability through chassis-based controller redundancy. It allows two ControlLogix controllers to operate in a primary/secondary configuration, automatically synchronizing tasks, data, and system status for seamless hot standby operation.
Designed for critical process control and high-uptime applications, the 1756-RM2 provides fast switchover response, minimizing downtime during controller failure events. It fits directly into the ControlLogix chassis and requires a fiber-optic communication cable for synchronization between primary and secondary controllers.
Technical Specifications
Model: 1756RM2
Series: ControlLogix
Type: Enhanced Redundancy Module
Function: Enables chassis-based ControlLogix controller redundancy
Redundancy Support: Yes – primary/secondary hot standby
Backplane Compatibility: ControlLogix chassis
Application: Critical infrastructure, process control, safety systems, high-availability automation
Electrical Specifications
Supply Voltage: Powered from ControlLogix backplane (5.1 V DC nominal)
Power Consumption: Approx. 4.5 W
Communication Ports: Fiber optic (for redundancy link, cable not included)
Synchronization Time: Sub-10 ms typical
Overvoltage Protection: Integrated via chassis power handling
Hardware Compatibility: Works with 1756-L7x and compatible redundancy firmware
Diagnostic Support: Integrated module status LEDs and controller diagnostics
Memory Support: Shared between redundant controllers via sync channel
Mechanical Specifications
Width: 40 mm
Height: 145 mm
Depth: 133 mm
Mounting Type: ControlLogix chassis slot
Connection Type: Fiber optic cable (for redundant sync)
Installation Orientation: Vertical (chassis-dependent)
Rack Assembly Possible: Yes – part of modular ControlLogix system
Weight: Approx. 280 g
Explosion Safety (Gas/Dust): Not rated
Front Installation Possible: Yes
Environmental Specifications
Operating Temperature: 0…60 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
IP Rating: IP20
Vibration Resistance: IEC 60068-2-6
Shock Resistance: IEC 60068-2-27
Certifications: CE, c-UL-us, RoHS
Use in Commercial Environments: Permitted with enclosure
Compliance & Communication
Supported Protocols:
– No direct network protocols supported (communication via chassis and sync cable)
Unsupported Protocols:
– EtherNet/IP, TCP/IP, DeviceNet, PROFIBUS, MODBUS, Data Highway
Communication Method: Controller-to-controller via fiber optic link
Programming Software: Studio 5000 Logix Designer
Redundancy Role: Primary/secondary sync management
Diagnostics: Status indicators and controller-level monitoring
Key Features & Benefits
✅ Enhanced Controller Redundancy – Maintains seamless operation in the event of controller failure with fast switchover
✅ Integrated into ControlLogix Architecture – Chassis-mounted design for streamlined installation
✅ Real-Time Synchronization – Fast sync of logic, tags, and system health between controllers
✅ Industrial-Grade Reliability – Suitable for process industries and safety-critical environments
✅ Allen Bradley Proven Platform – Designed for long-term support and robust performance
📦 Order the Allen Bradley 1756-RM2 from Drive Outlet Megastore
At Drive Outlet Megastore we offer unbeatable Allen Bradley 1756-RM2 prices. With 3 units currently in stock, we provide fast shipping and full support for redundancy configurations in your ControlLogix architecture.
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