The Allen-Bradley 1747-L543 is a SLC 5/04 CPU Processor for the SLC 500 modular controller family. It provides 64K of user memory and includes both an RS-232 serial port for programming and a DH+ Data Highway Plus port for networked communications. Designed for ladder logic control in mid-range PLC setups, it supports up to 4,096 discrete I/O points in typical configurations when paired with compatible 1747 I/O modules and a suitable chassis. As a system processor in the SLC 500 lineup, the 1747-L543 integrates into a modular rack architecture that enables scalable automation with standard DH+ networks and RS-232 interfacing for diagnostics and programming.
