Allen-Bradley 1747-L30C SLC 500 Processor Unit

The Allen-Bradley 1747-L30C SLC 500 Processor Unit is a fixed I/O CPU for the SLC 500 family with 30 I/O points and a built-in high‑speed counter. It provides 18 digital inputs and 12 digital outputs, enabling compact control of small machines and simple automation tasks. The unit includes DH-485 and RS-232 serial interfaces for programming and device communication in traditional AB networking configurations. It operates from 120/240 VAC power and supports 50/60 Hz operation, making it suitable for standard industrial power mains. For expandability, it can be used in a two‑slot expansion chassis to add I/O capacity as needed. This processor is documented in the SLC 500 catalog as part of Allen‑Bradley’s legacy fixed I/O controller lineup and represents the 1747-L30C variant of the series.