The Allen-Bradley 1746-A7 is a seven-slot SLC 500 modular chassis backplane that provides the bus and mechanical foundation for CPU and I/O modules in the SLC‑500 family. It supports seven modular slots and is designed to be used with a separate power supply and enclosure in Rockwell Automation systems; slot 0 is typically reserved for the CPU or a network adapter. The backplane is rated for a 10 A supply at 5 VDC on its backplane rails, ensuring reliable power distribution to installed modules, while remaining a passive carrier in the system. Catalog number 1746-A7 identifies this 7-slot chassis option within the SLC 500 modular chassis lineup.
