Allen-Bradley 1771-OB DC Output Module

Allen‑Bradley 1771-OB DC Output Module is a digital DC output driver for PLC‑5 systems, providing eight 12–24 V DC outputs to switch external devices. Designed for use in a 1771 I/O chassis, it interfaces with the PLC‑5 processor via the 1771 backplane, enabling centralized control of field devices from ladder logic. This eight‑point DC output module is typically used to drive DC loads such as relays, contactors, solenoids, and indicator lamps in industrial automation applications. As part of Allen‑Bradley’s 1771 I/O family, the 1771-OB shares mounting and interfacing conventions with other 1771 modules, ensuring straightforward integration into existing PLC‑5 installations. For proper operation, it is powered and wired according to the 12–24 V DC system requirements described in the official 1771-OB documentation and installation guide.