Allen-Bradley 1771-A3B1 PLC-5 12-Slot I/O Chassis Panel Mount
Supports up to twelve 1771 I/O, processor, or adapter modules. The Allen-Bradley 1771-A3B1 is a 12-slot I/O chassis designed for PLC-5 systems using the 1771 Universal I/O platform. Integrated 1771 Backplane Architecture.