Allen-Bradley 1756-RMC1 ControlLogix Redundancy 1-Meter Fiber Optic Cable

Product Overview

The Allen-Bradley 1756-RMC1 is a high-performance, 1-meter (3.28 ft) fiber optic redundancy cable specifically engineered for the ControlLogix® platform. This cable serves as the critical high-speed data link between a pair of 1756-RM, 1756-RM2, or 1756-RMXT redundancy modules. It facilitates the continuous synchronization of data between the primary and secondary chassis, ensuring that in the event of a hardware failure, the secondary system can assume control with zero impact on the process.

Utilizing fiber optic technology, the 1756-RMC1 provides an immune path against electromagnetic interference (EMI) and radio frequency interference (RFI), which are common in heavy industrial environments. This cable is a fundamental component for high-availability systems where downtime is not an option, such as in continuous chemical processing, power generation, and critical infrastructure.

Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation

• Model Number: 1756-RMC1

• Cable Type: Fiber Optic (Multi-mode)

• Length: 1 Meter (3.28 feet)

• Application: Chassis-to-chassis redundancy synchronization

• Compatible Modules: 1756-RM, 1756-RM2, 1756-RMXT Redundancy Modules

• Connector Type: Specialized high-speed redundancy connectors

• Weight: 0.02 kg

• Dimensions: 102 x 1.2 x 1 cm

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• HS Code: 8537101190

Key Technical Characteristics

• Ultra-Low Latency Synchronization: Designed for the rapid transfer of memory image data between controllers, allowing for seamless switchovers in sub-millisecond timeframes.

• EMI/RFI Immunity: The fiber optic core ensures that high-voltage equipment or nearby motor drives do not interfere with the critical synchronization heartbeat between the two redundant chassis.

• Robust Construction: Despite its lightweight 20-gram profile, the 1756-RMC1 is built to industrial standards, featuring reinforced jacketing and high-integrity connectors to prevent signal loss in vibrating environments.

• Plug-and-Play Integration: Fully optimized for use with Studio 5000 Logix Designer®, the cable requires no complex software configuration; the redundancy modules automatically recognize the link once connected.

• Deterministic Performance: Supports the rigorous timing requirements of ControlLogix high-availability systems, ensuring that produced/consumed tags and I/O data remain identical across both processors.

Industrial Applications

The 1756-RMC1 is indispensable for Safety Instrumented Systems (SIS) and high-availability PLC configurations. It is commonly deployed in:

• Continuous Process Control: Oil refineries and pharmaceutical plants where a stop in logic execution could lead to hazardous conditions or massive product loss.

• Automated Assembly: High-speed automotive lines where synchronization between primary and backup controllers prevents mechanical collisions during a failure.

• Remote Infrastructure: Water treatment and power distribution substations where system reliability must be guaranteed without onsite intervention.