1756-RMC1 | Allen-Bradley Fiber Cable

The 1756-RMC1 is a 1-meter (3.28 feet) fiber optic cable designed for use with ControlLogix redundancy modules, specifically the 1756-RM2 and 1756-RM2K. It is the shortest standard fiber cable available for these modules, optimized for compact redundancy setups in ControlLogix systems. Its primary role is to facilitate high-speed communication between redundant controllers to ensure seamless switchover and synchronization. This cable is essential in critical applications where controller redundancy is used to avoid process downtime. With its fiber optic medium, it offers excellent electrical noise immunity, making it suitable for high-interference environments. The 1756-RMC1 ensures precise and fast data transmission in distributed automation systems.

The cable uses pre-terminated industrial-grade fiber optic connectors compatible with the 1756-RM2 and RM2K module ports. These connectors are designed for plug-and-play operation and provide a secure mechanical fit to prevent disconnection from vibration or accidental contact. They are keyed to prevent incorrect insertion and ensure polarity alignment. The fiber tips are precision-polished to support reliable signal transmission with minimal loss. Installation does not require specialized tools, although care should be taken to avoid contamination or bending of the fiber ends. Connector caps are typically included to protect the tips when not in use.

The 1756-RMC1 is specifically designed for use with ControlLogix 1756-RM2 and 1756-RM2K redundancy modules and is not intended for general-purpose fiber communication. Its pinout, transmission characteristics, and physical connectors are tailored to match the RM module fiber ports. Attempting to use it with non-redundant or third-party modules may result in incompatibility or system faults. For other fiber optic communication tasks within the Rockwell ecosystem, different cables such as Stratix fiber links or 1783-series components should be used. Always verify compatibility in Rockwell’s product documentation before attempting substitution. Using the proper cable ensures full system reliability and certification compliance.

No, the 1756-RMC1 is the shortest available cable at 1 meter, but Allen-Bradley also offers longer versions such as the 1756-RMC3 (3 meters) and 1756-RMC10 (10 meters). These different lengths are provided to accommodate varying cabinet sizes, layouts, and distance requirements between primary and secondary controllers. All versions share the same electrical and optical specifications, differing only in length. Choosing the correct cable length minimizes signal degradation and physical slack. In close-coupled chassis applications, the 1756-RMC1 is preferred for its compact routing and ease of installation. Always select cable length based on cabinet dimensions and best wiring practices.

Yes, the 1756-RMC1 is an actively supported product in the Allen-Bradley ControlLogix platform. As redundancy remains a key strategy for high-availability systems, Rockwell Automation continues to provide this cable as part of its standard redundancy module accessories. It is available through authorized Rockwell distributors and is listed in official product catalogs. The cable's design complies with current industrial standards for ControlLogix redundancy communication. Availability of spares is ensured for maintenance and system expansion. Its ongoing production confirms its reliability in safety-critical and continuous-process environments.