Allen-Bradley 1747-L542 SLC 500 PLC CPU Module

The Allen-Bradley 1747-L542 SLC 500 CPU Module is a fixed-format central processing unit for the SLC 500 family. It provides 32K of user memory for program and data storage and includes an RS-232 serial port for programming, diagnostics, and PC communication. The CPU also features a DH+ (Data Highway Plus) network channel, enabling PLC-to-PLC and I/O network communications within a Data Highway Plus system. Designed to be installed in an SLC 500 backplane, it requires compatible I/O modules and the chassis to form a complete control solution. Typical applications include simple machine control, sequence logic, timing and counting, and other discrete control tasks where a compact, standalone processor is adequate. As a 5/04 model in the SLC 500 line, the 1747-L542 is commonly paired with standard memory modules and backplane wiring to support program storage and data exchange, and it is used with legacy Rockwell Automation software for configuration and maintenance.