The Allen-Bradley 1756-RM2 is a ControlLogix Redundancy Module designed for use in industrial automation systems. Below is a detailed introduction to the 1756-RM2 module:

Overview

The 1756-RM2 is an enhanced redundancy module that offers high-speed performance and reliability. It is specifically designed to work with ControlLogix systems, providing redundancy and failover capabilities to ensure continuous operation in critical applications.

Key Features and Benefits

1. High-Speed Performance:

   • The 1756-RM2 offers a speed of up to 1000 Mbps when paired with 1756-L7x controllers in two chassis.
   • It supports various synchronization speeds depending on the combination of redundancy modules used.

2. Redundancy and Reliability:

   • The module provides redundancy by allowing two separate systems to operate in parallel, ensuring continuous operation if one system fails.
   • It uses redundant fiber-optic ports for cross-loading, eliminating single points of failure.
   • During channel switching, the processing chassis remains synchronized, with a potential delay of approximately 10 milliseconds.

3. Enhanced Security and Diagnostics:

   • The 1756-RM2 includes enhanced security features to protect against unauthorized access and tampering.
   • It offers non-intrusive diagnostics to monitor and troubleshoot the system without disrupting operation.

4. Power and Cooling:

   • The module consumes 1.16 A of current at 5.1V DC and 3.4 mA at 24V DC.
   • Its maximum power consumption is 6W, with a heat dissipation of 21 BTU/hour.

5. Compatibility and Installation:

   • The 1756-RM2 can be installed in any slot of a ControlLogix chassis.
   • It is compatible with ControlLogix 5560 and 5570 series controllers.
   • Redundancy Module Configuration Tool (RSLinx 2.59) is required for configuration.

6. Communication and Connectivity:

   • The module supports up to seven enhanced ControlNet and EtherNet/IP communication modules.
   • It is compatible with 1756-RMC1, 1756-RMC3, and 1756-RMC10 cables, with lengths of 1m, 3m, and 10m, respectively.

7. Physical Characteristics:

   • The 1756-RM2 weighs 0.64 pounds and has an open-frame enclosure.
   • It integrates fiber-optic connectors for controller synchronization, using LC-type connectors and 8.5/125 micrometer single-mode fiber-optic cable.

Applications

The Allen-Bradley 1756-RM2 redundancy module is ideal for industrial automation systems that require high reliability and continuous operation. Its high-speed performance, redundancy features, and enhanced security make it suitable for critical applications where downtime is not an option.

In summary, the Allen-Bradley 1756-RM2 is a high-performance redundancy module designed for use in ControlLogix industrial automation systems. Its key features include high-speed performance, redundancy and reliability, enhanced security and diagnostics, power and cooling efficiency, compatibility with various ControlLogix controllers, communication and connectivity options, and robust physical characteristics.