Allen-Bradley 1771-94S AC Power Supply Module

The Allen-Bradley 1771-94S AC Power Supply Module is a purpose-built power source for 1771-series I/O backplanes in PLC-5-era automation systems. It accepts 120V AC input and delivers a 5V DC supply that backplanes and I/O modules rely on for proper operation. Used inside an Allen-Bradley 1771 I/O chassis, the module is part of the backplane power architecture that energizes the PLC-5 controller and its distributed I/O. Key verified specifications include: Input voltage 120V AC; Output voltage 5V DC. The 1771-94S is designed for installation within a 1771-series I/O chassis and is typically selected when configuring a PLC-5 or compatible 1771 I/O system in industrial environments.