1756-RM2 is a redundant module produced by Allen Bradley Rockwell Automation, primarily used for implementing redundant control in ControlLogix control systems. This module is designed to improve the reliability and availability of the system, especially in industrial applications that require high reliability, such as petroleum, natural gas, chemical, power, and rail transit.

Function and Features

Enhanced Redundancy Design: The 1756-RM2 features a Redundancy Enhanced design that provides fail safe performance in critical systems.

Compatibility: This module is compatible with various PLC peripheral modules and can be easily integrated into the ControlLogix system.

Communication interface: Supports multiple communication networks, including Ethernet and other control networks, with a maximum support of 7 enhanced control networks.

Environmental adaptability: The working temperature range is wide, from -40 ℃ to+85 ℃, suitable for various industrial environments.

Fiber optic connection speed: In enhanced redundant systems, the speed through fiber optic channels can reach 1000 Mbps.

Module specifications: The size is 32-140 ° F (0-60 ° C), and the weight is approximately 0.64 LBS (approximately 0.3 kilograms).

Application scenarios

1756-RM2 is widely used in industrial process control, power plants, and other applications that require high reliability. For example, in a typical redundant I/O system, two ControlLogix controllers are connected through a 1756-RM2 module to form a redundant system, ensuring the continuous operation and data integrity of the system

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Installation and Configuration

During installation, align the circuit board with the guide devices at the top and bottom of the rack, then slide the module into the rack and ensure that the module backplane connector is properly connected to the rack backplane. After completing these steps, the module should be flush with other installed modules.

For specific configuration steps, users need to first install the RMCT software and disable automatic synchronization, disconnect the fiber optic connections between redundant modules, and then insert the new 1756-RM2 module into the position of the original module.

matters needing attention

In some cases, there may be issues where the communication module cannot restore its redundant state, resulting in the system being unable to synchronize. In addition, synchronization commands may also fail due to the automatic qualification option changing from "always" to "never". These issues mainly occur on specific modules, and special attention should be paid to the switching behavior of factory settings

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