Rockwell 1747-L524 SLC 5/02 Processor 4K Memory DH485 Communication. Maximum User Memory: 4K instructions; Maximum Number of I/O: 4096 in and 4096 out; Maximum Local Analog I/O: 480
Rockwell 1747-L542 SLC 500 SLC 5/04 CPU Processor, 32K Memory, DH+ & RS-232 Communication Ports, Series C
Rockwell 1747-L543 SLC 500 SLC 5/04 CPU Processor, 32K Memory, DH+ & RS-232 Communication Ports, Series C
Rockwell 1747-L551 SLC 500 SLC 5/05 CPU Processor, 16K Memory, DH+ & RS-232 Communication Ports, Series C
Rockwell 1747-L552 SLC 500 SLC 5/05 CPU Processor, 32K Memory, DH+ & RS-232 Communication Ports, Series C