Allen-Bradley 1771-OW 8-Point DC Output Module

The Allen-Bradley 1771-OW is an eight-point digital output module from Rockwell Automation’s 1771 I/O family designed to be used in PLC-5/SLC 500 automation systems to switch external devices via relay contact outputs. It accepts control data from the backplane as an 8-bit word, energizing or de-energizing each of the eight outputs to drive relays, solenoids, or other field devices connected to the module’s terminals. This 1771-OW variant is part of a broader line that includes related models such as 1771-OWNA and 1771-OW16, reflecting the family’s range of 8- and 16-point configurations and associated form factors while maintaining compatibility with standard 1771 backplane wiring and mounting in 1771 I/O chassis. Common applications include panel automation, machine control, and centralized I/O subsystems where reliable, isolated switching of external circuits is required and where a compact, plug-in module can be integrated directly into existing Rockwell 1771 architectures. The module’s relay-based outputs provide a straightforward interface for controlling external loads from a Rockwell control program, preserving the familiar 8-bit output addressing scheme and enabling scalable expansion of the PLC-5/SLC 500 control network without altering the core logic. In sum, the 1771-OW delivers eight discrete relay contacts controlled by a single 8-bit word, offering a robust, field-wirable solution for expanding digital output capacity within the 1771 ecosystem.