Allen-Bradley 1771-OAD Output Module

Allen-Bradley 1771-OAD is an AC output module for the SLC 500 family that switches 12–120 VAC loads under PLC control. It provides discrete outputs from the processor backplane to drive AC field devices, such as relays, contactors, solenoids, and other line-powered devices, all within the 12–120 VAC range. As part of the 1771 I/O family, it snaps into a compatible 1771 backplane chassis and shares the same backplane power and signaling conventions used by other 1771 modules, enabling straightforward integration with Rockwell Automation systems. The 1771-OAD is typically used in applications where direct AC switching is required from a PLC, eliminating the need for external relays for simple loads or enabling compact control panels where loads are powered from standard line voltages. Wiring follows standard 1771 installation practices, including correct terminal assignment and load wiring to minimize voltage drop and interference. When selecting this module, ensure your control system and field devices operate within the 12–120 VAC category and that the connected devices are compatible with a digital output switching arrangement. This module supports replacement compatibility within the 1771-series ecosystem, making it suitable for maintaining older automation infrastructure while enabling centralized control from a Rockwell-compatible PLC.