The Allen-Bradley 1747-L551 SLC 5/01 Processor Module is a PLC processor designed for SLC 500 automation systems, delivering 16K words of memory and local I/O processing via serial DH-485 communication. It supports SLC 500 I/O modules and is RSLogix 500-compatible for programming, with a chassis-mounted installation in control panels. Typical applications include standalone machine control, manufacturing production lines, packaging machinery, and conveyor or material-handling systems operating in environments from 0°C to 60°C. Common replacements include Allen-Bradley 1747-L552, 1747-L553, and 1769-L24ER.
