Allen-Bradley 1771-0BD Output Module

Allen-Bradley 1771-0BD Output Module is a 16-channel DC output module designed for PLC-5 1771 I/O backplanes, serving as a compact way to switch field loads under automation control. It provides DC transistor outputs for energizing devices such as relays and solenoids, with a per-output power rating of 0.6 W, which supports approximately 25 mA per channel at typical 24 V DC operation. The 0BD variant is an alternate part number for the 1771-OBD family (including 1771-OBD/B and 1771-OBD/C), indicating Series B compatibility within the 1771 DC output module lineup. This module is intended for use with 1771 I/O chassis in PLC-5 systems and draws power and signals from the 1771 backplane, with field wiring generally supplied in the 10–30 V DC range. In practice, the 1771-0BD/OBD DC output module is suited for switching low-power DC loads and interfacing with field devices like relays or small actuators as part of broader automation sequences.