Allen-Bradley 1771-OW16 16-Point Output Module

Allen-Bradley 1771-OW16 is a 16-point electromechanical relay output module for PLC-5 1771 I/O backplanes. This Series B device provides sixteen channel-isolated relay contacts that switch external loads in the 24–250 V ac, 24–150 V dc range, enabling direct control of devices such as motors, valves, solenoids, and indicators from a PLC-5 program. The OW16 is designed to plug into a PLC-5 1771 I/O chassis and communicates with the controller via the standard backplane I/O timing and scan cycles, with each output energizable independently and isolated from the others to reduce cross-talk. As a legacy module, the 1771-OW16 is discontinued; you may encounter it in older installations or in remanufactured form through third-party suppliers, with documentation historically referencing 16 relay outputs configured for AC or DC loads within the stated voltage ranges.