Allen Bradley 1745-C2 Interconnect Cable

The Allen-Bradley 1745-C2, also cataloged as the 1745-C2 Interconnect Cable, operates as a dedicated hardware component for linking an SLC 100 processor to an expansion unit within Allen-Bradley SLC 100 PLC platforms.

Hardware Specifications

Allen-Bradley Technical Characteristics

• Backplane Bus Signal Integrity: The 1745-C2 uses a twisted-pair 10-pin configuration to maintain deterministic logic timing across backplane bus expansions while minimizing electromagnetic interference (EMI).
• I/O Density Expansion Scaling: Allows local rack expansion without requiring external signal repeaters, maintaining predictable backplane cycle updates for connected discrete expansion modules.

Frequently Asked Questions

Q: Can the 1745-C2 cable be connected or disconnected while the SLC 100 processor is powered?

A: No. The 1745-C2 carries backplane logic signals and power supply lines between chassis. Connecting or disconnecting this cable under power can damage internal logic components or cause CPU fault trip states.

Q: What is the maximum allowable continuous voltage across the internal conductors of the 1745-C2?

A: The conductors are rated for a maximum line-to-line operational voltage of 70 V max.

Q: Can multiple 1745-C2 cables be daisy-chained together to extend connection distance?

A: No. Daisy-chaining cables increases backplane signal capacitance and trace impedance beyond design limits, leading to potential signal corruption or communication timing faults.

Field Installation Guidelines

1. Remove primary AC power from both the main SLC 100 processor unit and all downstream expansion units before inserting or removing the cable.
2. Align the 10-pin keyed connectors on the cable header with the mating 10-pin chassis sockets to prevent pin bending or misaligned contact insertion.
3. Ensure the cable flex path maintains a minimum bend radius of 1.0 in (25.4 mm) to avoid strain on the conductor terminations.
4. Route the cable away from high-voltage AC lines, variable frequency drive motor leads, and heavy inductive loads to prevent noise coupling into backplane logic signals.