Allen-Bradley 1746-OB16 Discrete Output Module

Allen-Bradley 1746-OB16 is a 16-channel DC digital output module designed for the SLC 500 I/O system. This sourcing DC output module provides sixteen transistor-style outputs that switch external DC loads from a 24V DC field supply, typically used to energize relays, solenoids, and indicator devices in automation circuits. It mounts in a 1746 backplane within an SLC 500 chassis and is controlled by Rockwell Automation controllers through the backplane I/O scan, integrating with the system's ladder logic programming. A variant, 1746-OB16E, offers electrical protection for the outputs to guard against faults and transient events, expanding the protection offered across the family. The 1746-OB16 is part of Allen-Bradley’s OB-series DC digital output modules and is a common choice for discrete control tasks in legacy SLC 500 installations.