Allen-Bradley 1756-OB32 Discrete Output Module

Allen-Bradley 1756-OB32 is a ControlLogix 32-point DC digital output module that provides 32 high-density, DC-sourcing outputs, arranged as two groups of 16 points. It operates from a 10 to 31.2 V DC supply (commonly 12/24 V), enabling direct control of field devices such as pilot lights, relays, solenoids, and alarms. Each point can source up to 0.5 A and has an on-state drop around 200 mV at 0.5 A, with an off-state leakage of up to 0.5 mA per point; the module supports a total load of about 16 A (linear derating to 10 A at 60 C). Typical switching timing is 60 µs to 1 ms for OFF→ON, with a per-point surge rating of 1 A for 10 ms (repeatable every 2 s at 60 C). The OB32 plugs into a ControlLogix backplane and uses a 36-pin connector to feed 32 outputs, making it a robust solution for DC digital output tasks in automation systems.