Allen-Bradley 1756-OB16D is a ControlLogix 16-point DC diagnostic output module that provides 24 V DC outputs for field devices while delivering built-in diagnostics to the controller. It operates on 19.2–30 V DC, uses a 36-pin field-terminal interface, and supports removable terminal blocks 1756-TBCH or 1756-TBS6H for wiring. The module exposes diagnostic data types and time-stamped event data for per-point status, including fuse or no-load conditions, enabling visibility into each output's health within a Rockwell I/O network.
