Allen-Bradley 1746-A2 SLC 500 Fixed IO Expansion Chassis 2 Slot Rack

The Allen-Bradley 1746-A2 is a fixed I/O expansion chassis for the SLC 500 family, offering two expansion slots in a compact 2-slot rack that connects to an SLC 500 processor via the system backplane. It is designed to host two I/O modules beyond the processor’s built-in I/O, extending the controller’s input and output capabilities without replacing the main CPU. The chassis includes an internal power supply to support both slots, keeping the expansion I/O powered and synchronized with the central controller. This expansion rack is used in stand-alone automation setups, machine panels, or process lines where additional I/O density is required, and should be paired with a compatible SLC 500 processor and appropriate I/O modules designed for fixed or modular SLC 500 configurations.