Allen-Bradley 1746-L524 SLC 500 CPU Processor Unit

Allen-Bradley SLC 500 CPU Processor Unit in the SLC 5/02 family (firmware FRN 7C) is a compact, field-proven controller designed to run logic, sequencing, and control tasks in legacy automation equipment. It provides 4K of user memory in Series B/C variants, along with a DH-485 network interface for peer-to-peer communication and an RS-232 serial port for programming and diagnostics, enabling easy integration with existing Allen-Bradley hardware and software. The processor includes Flash-based backup memory and standard battery-backed RAM to preserve programs and data through power loss, with a typical power draw around 500 mA at 5 V and 175 mA at 24 V, making it compatible with common backplane power budgets. Installed in an SLC 500 chassis, this CPU handles both discrete and sequential I/O control and adheres to the SLC 500 instruction set, serving as the computing core for automation tasks across industrial applications such as packaging lines, conveyors, and machine-tending processes.