Allen-Bradley 1771-OBN PLC-5 DC Output Module

The Allen‑Bradley 1771-OBN PLC-5 DC Output Module is a 32‑point high‑true, DC source‑type output interface for PLC‑5 backplanes. It fits a single chassis slot and groups its outputs into four banks of eight, all operating on 10–30 V DC. Each output can continuously source up to 0.5 A, with a combined per‑bank limit of 2 A, and the module draws approximately 330 mA from the backplane. Front‑panel indicators provide status for all 32 outputs, enabling quick visual diagnostics. This module is documented as a DC output termination device with 32 outputs and a source output configuration, designed to be used within PLC‑5 systems that require DC signal switching. The 1771-OBN supports four eight‑channel groups in one module, delivering discrete on/off control for DC loads across the PLC‑5 I/O rack. As a universal PLC‑5 I/O component, it is intended to operate with compatible PLC‑5 controllers and backplanes that supply 10–30 V DC to the outputs, making it suitable for driving DC actuators and related devices where a positive‑voltage, high‑true switching scheme is preferred. Each module’s wiring and backplane requirements are consistent with standard PLC‑5 DC output implementations, ensuring reliable operation within industrial automation setups that rely on legacy Allen‑Bradley PLC architectures.