Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1746-C9 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Chassis Interconnect Cable (Rack Interconnect) |
| Product Series | SLC 500 |
| Cable Length | 36 inches (3 ft / 914.4 mm) |
| Compatible Chassis | 1746-A4, 1746-A7, 1746-A10, 1746-A13 |
| Connector Type | Keyed, high-density backplane connectors |
| Backplane Current (5V) | 110 mA |
| Backplane Current (24V) | 85 mA |
| Cable Construction | Ribbon-style with rigid shrink-wrap strain relief |
| Maximum Chassis Spacing | 5 inches for stacked 13-slot chassis |
| Recommended Clearance | Minimum 4 inches around cable |
| Installation Orientation | Horizontal or vertical within enclosure |
| Connection Hardware | 1746-RT32 |
| Operating Temperature | -20°C to +60°C |
| Certifications | UL, CE |
| Weight | Approx. 0.03 kg |
Main Features and Advantages
Extends SLC 500 Backplane for Modular Expansion: The Allen-Bradley 1746-C9 enables the SLC 500 processor to address I/O modules in a second chassis through the same parallel backplane architecture used in the main rack. This eliminates the need for a separate remote I/O scanner and adapter pair when the only requirement is additional local slot capacity. For facilities that have outgrown their original 4, 7, or 10-slot chassis, the 1746-C9 provides a straightforward, low-latency expansion path that preserves the system’s scan time performance without introducing network communication overhead.
Keyed Connectors Prevent Installation Errors: Both ends of the 1746-C9 feature keyed connectors designed to ensure correct orientation during installation . In a control cabinet where multiple ribbon cables may be present, this mechanical keying is a critical safeguard against misconnection that could damage backplane circuitry. The connectors also include locking latches that secure the cable in place and prevent accidental disconnection from vibration or handling.
Reinforced Strain Relief at Termination Points: The 1746-C9 incorporates rigid shrink-wrap at both connector ends, providing strain relief where the flexible ribbon transitions to the rigid connector housing . This design detail addresses the most common failure mode of ribbon cables in industrial environments: conductor fatigue at the connector interface. By distributing mechanical stress away from the delicate solder joints, the 1746-C9 maintains reliable electrical continuity over years of service.
Flexible Ribbon Design for Cabinet Routing: While the connector ends are rigid, the central portion of the 1746-C9 uses a flexible ribbon construction that simplifies routing within confined control panel spaces . The cable can bend around obstructions and follow the natural contours of the enclosure, reducing installation time and avoiding the need to relocate components solely to accommodate cable routing. The recommended minimum clearance of 4 inches around the cable ensures adequate bend radius for long-term reliability .
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