Allen-Bradley 1771-OAD AC Output Module 10-138 VAC USNT

Allen-Bradley 1771-OAD AC Output Module 10-138 VAC is a 16-point digital output module designed for PLC-5 I/O backplanes. It provides sixteen AC output channels that switch loads directly in the 10–138 VAC range, enabling control of common AC devices such as relays, contactors, and solenoids from a PLC-5 processor. Each output supports up to 2 A continuous current, and the module’s backplane draw is about 295 mA, with a maximum module current rating around 6 A. The 1771-OAD occupies a single slot in a PLC-5 1771 I/O chassis, making it straightforward to scale I/O without adding separate power modules. This module is part of Allen-Bradley’s 1771 I/O family and is used to expand digital AC output capability within existing PLC-5 control systems. Its 10–138 VAC operating window aligns with standard line-voltage control circuits in North American installations, and the device wires to the chassis backplane for synchronized, processor-driven switching of each output, supporting interlocking, valve and solenoid control, and other automation tasks that require AC loads to be switched under PLC control.