Allen-Bradley 1746-A7 SLC 500 7-Slot Modular Chassis

The Allen-Bradley 1746-A7 is a seven-slot modular chassis for the SLC 500 family, providing a compact backplane framework that accommodates a CPU in slot 0 and up to six additional I/O or communication modules, enabling a scalable control architecture within a single enclosure. As part of the SLC 500 modular hardware style, the 1746-A7’s backplane supports the standard 1746 I/O modules and allows inter-chassis interconnect cables to link multiple chassis in an enclosure, supporting configurations that range from simple to moderately complex automation tasks. Power is supplied separately by a 1746-P-series power supply, since the chassis itself does not include a built-in power source, and installers typically mount the chassis in a cabinet alongside CPU, I/O, and network components. Common applications include discrete control, material handling, and small- to mid-size manufacturing lines where a compact, modular rack supports CPU in slot 0 and flexible I/O placement across the remaining slots.