Technical Analysis: Allen-Bradley 1746-C9
The Allen-Bradley 1746-C9 is a 9-inch (228.6 mm) chassis interconnect cable used within the SLC 500™ modular controller system. This high-integrity data cable is essential for expanding a PLC system beyond a single chassis. It allows the processor located in the primary chassis to communicate with I/O modules installed in secondary (extended) chassis, effectively treating multiple physical racks as a single logical controller system.
Functionality and Connectivity
The 1746-C9 cable extends the SLC 500 backplane signals. It features high-density connectors on both ends that plug into the dedicated expansion ports found on 1746-A4, A7, A10, and A13 chassis. The short 9-inch length is specifically designed for side-by-side chassis mounting or vertical stacking within a control cabinet, minimizing signal latency and cable clutter.
Key Characteristics
- Cable Length: 9 Inches (22.86 cm).
- System Compatibility: All modular SLC 500 chassis.
- Connector Type: Multi-pin high-speed backplane expansion connectors.
- Shielding: Fully shielded to prevent electromagnetic interference (EMI).
- Maximum Expansion: Supports up to 3 chassis total (1 local + 2 remote).
Installation Best Practices
Proper installation of the 1746-C9 is critical for system stability. Warning: Always remove power from the system before connecting or disconnecting the interconnect cable to avoid damaging the backplane circuitry or the CPU. The cable must be firmly seated and the retaining screws (if applicable) tightened to ensure consistent electrical contact, especially in environments prone to vibration.
| Category | Value |
| Cable Type | Chassis Interconnect |
| Length | 9 in / 228 mm |
| Flexibility | Limited (Standard fixed installation) |
Operational Advantage
The 1746-C9 allows for the physical separation of I/O groups while maintaining a single processor environment. This modularity is key for large industrial machines where different sections of the machine may require separate I/O racks for easier wiring management, yet all need to be controlled by the same SLC 500 CPU.
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This 9-inch ribbon cable is required for linking a 1746-A10 chassis to additional secondary racks in your system.
