Allen-Bradley 1756-OB16D 16-Point DC Output Module

Allen-Bradley 1756-OB16D is a 16-channel DC diagnostic output module for ControlLogix systems that provides built-in health monitoring for each output. Operating from 19.2–30 V DC, it delivers 16 digital outputs with a per-point current rating up to 2 A and a total module current rating of 8 A at 30°C (4 A at 60°C), with 36-pin removable terminal blocks (1756-TBCH or 1756-TBS6H) for field wiring. The module features continuous isolation up to 50 V and backplane current requirements of roughly 250 mA at 5 V and 140 mA at 24 V, along with diagnostics including on-state/off-state verification, a configurable pulse test, and a timestamped diagnostic log (±1 ms). Ideal for controlling relays, solenoids, or indicators in ControlLogix-equipped automation panels, the 1756-OB16D combines 16-point DC output capability with per-channel diagnostics to help detect shorts and open loads and simplify maintenance. Power dissipation is typically around 3.3 watts at 60°C, supporting reliable operation in industrial environments.