Allen-Bradley 1746-OX8 SLC 500 Digital Output Module

The Allen-Bradley 1746-OX8 SLC 500 Digital Output Module is an eight-point isolated relay output card designed for the SLC 500 backplane, delivering eight independently isolated relay contact outputs. Each channel provides a normally open relay contact capable of switching external loads, with output voltage support in the 5–250 V AC or 5–125 V DC range, enabling direct control of a variety of AC and DC devices from the PLC. The module installs in a 1746 I/O rack and interfaces with the SLC 500 scanner and bus to energize its eight relay outputs, making it suitable for controlling relays, solenoids, and other field circuits from a legacy automation system. Note that Rockwell Automation lists the 1746-OX8 as discontinued as of September 30, 2024, which may affect availability and support, particularly for new or unused units. This module fits into existing SLC 500 architectures, preserving wiring schemes and signal conventions while expanding the system’s relay-based output capacity with eight discrete, isolation-protected channels.