Allen-Bradley 1747-L531 SLC 500 Programmable Logic Controller

The Allen-Bradley 1747-L531 is a SLC 500 5/03 processor (CPU) in the modular SLC 500 family, designed for discrete industrial control tasks and programmed with RSLogix 500. It provides 8 KB of user memory for ladder logic and data, and it includes DH-485 and RS-232 serial interfaces, enabling both DH+ network communication and direct PC programming connections. As a 5/03 model, the L531 sits in the SLC 500 lineup alongside other 1747-series CPUs and is commonly deployed in small to mid-size automation installations where reliable serial communication is needed. The processor is compatible with Rockwell's 1747 modular I/O and accessories, supports ladder logic, timers, and counters, and is designed for chassis mounting in a 1747 rack. Typical configurations include standalone machines and small production lines that rely on reliable RS-485/RS-232 communication and straightforward PLC programming with RSLogix 500.