Allen-Bradley 1771-OW Digital Relay Output Module

Allen-Bradley 1771-OW is an eight-point electromechanical relay output module for PLC-5 I/O backplanes, delivering eight independent relay contacts that can be configured as Form A (normally open) or Form B (normally closed) outputs to drive field devices such as solenoids, indicators, and motor starters. The module supports both AC and DC loads via selectable relay contacts, with voltage ranges typically listed as 24 to 250 VAC for AC loads and 24 to 150 VDC for DC loads, depending on the installed variant. Field wiring is organized through a field wiring arm for secure, tidy connections, and per-channel status indicators aid in quick troubleshooting. As part of the 1771 I/O family, the 1771-OW interfaces with Allen-Bradley PLC-5 controllers, providing isolated switching for external circuits in industrial automation environments. This configuration supports legacy control architectures that require reliable discrete control of relays and is commonly used to switch motors, valves, or other actuation devices controlled by PLC-5 logic.