The Allen-Bradley 1746-A7 is a seven-slot modular SLC 500 chassis that serves as the backbone for SLC 500 control systems, providing the backplane and mounting structure for CPUs, I/O modules, and optional communications modules. As part of the SLC 500 family, it accepts standard 1746 I/O modules and 1746-P power supplies to power the assembly, and is compatible with the modular backplane line including 1746-A4, 1746-A7, 1746-A10, and 1746-A13 configurations. This chassis is used in small to mid-size automation tasks where a compact, modular rack is required to house a CPU and discrete I/O modules in a single enclosure.
