Allen-Bradley 1746-OA16 NSNBC01 Programmable Logic Controller

The Allen-Bradley 1746-OA16 is a 16-channel AC output module for the SLC 500 family, designed to switch AC loads from a PLC backplane. Each of its outputs uses triac switching to drive external devices such as relays, contactors, solenoids, heaters, or lighting circuits when commanded by an SLC processor. The module is rated for 85–265 VAC operation with a per-channel load current of up to 370 mA, enabling compact control of multiple loads from a single rack. It installs in a standard SLC I/O backplane and supports local or remote I/O configurations with compatible SLC processors. Rockwell Automation documents the 1746-OA16 as a SLC System 16-point AC output module and lists it as discontinued as of December 1, 2022, a factor to consider for legacy installations and ongoing maintenance. In practical use, the 1746-OA16 is commonly employed to switch higher‑voltage AC peripherals in manufacturing lines, conveyors, and automation enclosures where a compact, ready-made AC output interface simplifies wiring and cabinet space.