The Allen-Bradley 1771-A1B is a compact 5-slot I/O chassis assembly from the PLC-5 series, designed for smaller-scale automation systems or applications with limited panel space. It supports up to five 1771-series I/O modules or one PLC-5 processor, delivering a reliable 5.25 VDC backplane voltage with a current capacity of up to 16 Amps. Ideal for modular control setups, the 1771-A1B provides consistent communication across all installed modules and is built for panel mounting. Though discontinued, it remains a dependable choice in legacy PLC-5 control systems. Manufacturer Rockwell Automation Brand Allen-Bradley Part Number 1771-A1B Product Type I/O Chassis Assembly Series PLC-5 / 1771 Number of Slots 5 Mounting Back-Panel Mount Backplane Voltage 5.25 VDC Backplane Current 16 Amps Max Compatible Modules 1771 I/O Modules, PLC-5 Processors Status Discontinued by Manufacturer
