Allen-Bradley 1747-L542 SLC 5/04 Processor 32KB By wayne No Comments on Allen-Bradley 1747-L542 SLC 5/04 Processor 32KB 2 Min Read The Allen-Bradley 1747-L542 SLC 5/04 processor offers 32KB memory and supports 4096 I/O points with DH+ and RS-232 communication.