Allen-Bradley 1747-L20L SLC 500 CPU Processor Unit

The Allen-Bradley 1747-L20L Ser.B SLC 500 fixed I/O CPU module is a compact PLC processor that combines control logic with integrated 20-point I/O in a single fixed I/O unit. As a member of the Rockwell Automation SLC 500 family, it is designed for use in a 1747-series backplane rack and works alongside other 1747 I/O modules in the same chassis. The L20L variant includes a power supply and uses capacitor-backed RAM memory, enabling reliable operation and data retention in legacy automation systems. This CPU is purpose-built for 20-point I/O configurations in fixed I/O setups, providing straightforward control for discrete inputs and outputs on small to mid-size automation tasks.