Allen-Bradley 1756-RMC1 ControlLogix Redundancy Fiber Optic Cable

Allen-Bradley 1756-RMC1 ControlLogix Redundancy Fiber Optic Cable

The Allen-Bradley 1756-RMC1, also cataloged as the 1756-RMC1 ControlLogix Redundancy Fiber Optic Cable, operates as a dedicated hardware component for redundancy communication link connection within ControlLogix 1756-RM series systems. The cable provides a physical fiber interface between redundancy modules for synchronization data transfer and system status exchange.

Hardware Specifications

Industrial Control Network Interface Characteristics

The 1756-RMC1 is designed for ControlLogix redundancy architectures using dedicated redundancy module communication paths. The cable provides direct optical signal transmission between paired redundancy modules without requiring external signal conditioning or electrical power.

The fiber optic connection supports deterministic data exchange between redundancy components. Its short 1 m length is configured for rack-level installation where redundancy modules are positioned within the same control cabinet.

Firmware and ControlLogix Redundancy Compatibility

The cable assembly is matched with ControlLogix redundancy module configurations including 1756-RM and 1756-RM2 platforms. Proper firmware compatibility between redundancy modules and controller systems is required before establishing synchronized operation.

The fiber link maintains separation from electrical noise sources commonly present in PLC cabinets, supporting stable communication between redundancy modules through an optical transmission path.

Frequently Asked Questions (FAQ)

Q: Is the 1756-RMC1 cable an active communication module?
A: No. The 1756-RMC1 is a passive fiber optic cable assembly and does not contain active electronic components or require an external power supply.

Q: Which ControlLogix modules are compatible with the 1756-RMC1?
A: The cable is specified for use with 1756-RM, 1756-RM2, 1756-RMXT, and 1756-RM2XT redundancy modules.

Q: Can the fiber cable be installed together with standard power wiring?
A: Fiber optic cable routing should maintain physical separation from high-voltage power conductors and follow cabinet wiring practices to reduce mechanical stress and maintain signal integrity.

Field Installation Guidelines

Install the 1756-RMC1 between compatible ControlLogix redundancy modules using the designated fiber ports. Verify connector cleanliness before installation because contamination on optical surfaces can affect transmission performance.

Route the cable with controlled bending radius according to fiber optic installation practices. Avoid sharp bends, excessive pulling force, and mechanical loading on the connector ends.

Separate fiber communication cables from high-current power cables and switching circuits where possible. Maintain proper cabinet grounding practices for adjacent electrical equipment and ensure the cable is secured to prevent vibration-related movement.

Before system startup, verify module firmware compatibility, redundancy configuration parameters, and communication link status through the ControlLogix programming environment.