Allen Bradley 1757-SRC1 ControlLogix System Redundancy Fiber Optic Cable

Product Overview

The Allen Bradley 1757-SRC1 serves as the critical high-speed data link for ControlLogix redundancy systems. This 1-meter (3.28 ft) fiber optic cable facilitates the synchronization of data between primary and secondary 1757-SRM (System Redundancy Modules). By providing a dedicated path for state-tracking and memory mirroring, this cable ensures the secondary controller remains ready to assume control without process interruption. We provide this unit as 100% Brand New and Factory Original, offering a "zero-hour" solution for mission-critical infrastructure despite its discontinued status.

Technical Specifications

Engineering Advantages

• EMI/RFI Immunity: The 1757-SRC1 utilizes fiber optic media rather than copper, which completely eliminates risks associated with electromagnetic interference. This ensures stable data synchronization even when routing the cable near high-voltage motor leads or variable frequency drives (VFDs).

• High-Speed Synchronization: The multi-mode fiber architecture supports the rapid transfer rates required to mirror controller memory. This speed allows the secondary 1757-SRM to track the primary CPU's scan cycle with microsecond precision, preventing "bump" transfers during a failover event.

• Standardized ST-Connectors: The ST-style bayonet mount provides a secure, vibration-resistant connection. The "twist-and-lock" mechanism prevents accidental disconnection in industrial environments subject to high mechanical resonance.

• Optimized Length for Swing-Arm Racks: The 1-meter length provides sufficient slack for cross-chassis mounting in standard 19-inch enclosures while minimizing signal attenuation and excessive cable clutter within the wire management duct.

FAQs

• Can I use a standard off-the-shelf fiber cable instead of the 1757-SRC1?

  While the connectors are standard ST-type, the 1757-SRC1 features specific attenuation characteristics and industrial jacketing tested by Rockwell Automation for use with the 1757-SRM. Using non-specified cables can introduce synchronization jitter or "Partner Disconnected" errors in the redundancy log.

• How should I handle the cable during installation to avoid damage?

  Fiber optic cores are fragile. You must strictly observe the minimum bend radius (typically 1 inch or 25mm). Avoid sharp 90-degree bends and do not use plastic zip-ties with excessive force, as crushing the jacket will degrade the light signal and cause redundancy failure.

• Since the 1757-SRC1 is discontinued, what is the condition of this stock?

  We guarantee this item is 100% Brand New and remains in its original factory-sealed Allen Bradley packaging. We do not sell used or "pulled" cables, ensuring that the fiber tips are free from scratches or contaminants that compromise data integrity.

• Is this cable compatible with the newer 1756-RM2 modules?

  No. The 1757-SRC1 specifically services the legacy 1757-SRM series. The newer 1756-RM2 modules utilize small form-factor pluggable (SFP) transceivers and LC-style fiber connectors (such as the 1756-RMC series cables). Always verify your module part number before purchase.