Allen-Bradley | 1756-RM2 Redundancy Module ControlLogix

Overview

The Allen-Bradley 1756-RM2 is a single-channel ControlLogix Redundancy Module by Rockwell Automation, designed for high-speed synchronization up to 1000 Mbps and a controller switchover time of 20 ms. It supports ControlLogix 5560 and 5570 controllers, offering reliability in SIL2-rated applications. This module enables fault-tolerant configurations with redundancy, ensuring system continuity in critical industrial operations.

Features

1. High-Speed Synchronization: Supports synchronization speeds up to 1000 Mbps.
2. Enhanced Diagnostics: Interference-free diagnostics for superior reliability.
3. Compact Design: Occupies a single slot in the ControlLogix chassis.
4. Wide Operating Range: Operates within temperatures from 32 to 140°F (0 to 60°C).
5. Fiber Optic Communication: Uses LC-type connectors with 8.5/125 micron single-mode fiber-optic cables.
6. Flexible Connectivity: Compatible with 1756-RMC1, RMC3, and RMC10 cables (1m, 3m, 10m).
7. Support for Multiple Modules: Handles up to seven EtherNet/IP or ControlNet communication modules.

Applications

• Critical Process Automation: Ensures uninterrupted operation in manufacturing and process industries.
• Safety-Critical Systems: Certified for SIL2 applications, improving system reliability.
• Redundant Control Architectures: Provides seamless redundancy for demanding industrial environments.

Technical Specifications

• Manufacturer: Rockwell Automation
• Brand: Allen-Bradley
• Model: 1756-RM2
• Series: ControlLogix
• Transmission Speed: Up to 1000 Mbps
• Switchover Time: 20 ms
• Connector Type: LC-Type
• Cable Type: 8.5/125 micron single-mode fiber-optic
• Supported Controllers: ControlLogix 5560, 5570
• Power Requirements: 1.16 A @ 5.1V DC, 3.4 mA @ 24V DC
• Thermal Dissipation: 21 BTU/hr
• Dimensions: 5.51 x 4.41 x 5.71 inches
• Enclosure: Open, no specific rating

FAQ

• Q: Can the 1756-RM2 be used with older ControlLogix controllers?
  A: It is designed for ControlLogix 5560 and 5570 series controllers. Compatibility with older controllers depends on firmware versions.
• Q: What is the maximum supported cable length?
  A: The 1756-RM2 supports fiber optic cables up to 10 km (6.21 miles) with proper LC-type connectors.
• Q: Is the module suitable for outdoor installations?
  A: The module does not have a rated enclosure and should be used in controlled environments.
• Q: What is the redundancy switchover time?
  A: Switchover time is approximately 20 ms under optimal conditions.
• Q: Does the 1756-RM2 require specific firmware?
  A: The 1756-RM2 requires compatible firmware for optimal performance. You should check Rockwell Automation’s firmware requirements.

Check official datasheet for more detailed information: ControlLogix and GuardLogix Controllers