The Allen-Bradley 1747-L542 CPU Module is a SLC 500 central processing unit designed for use with Rockwell Automation’s SLC 500 controllers. It is the 5/04 processor variant and includes 32K of memory for program and data storage. The module provides RS-232 serial communication and a DH+ (Data Highway Plus) port for networked device communication, enabling programming and data exchange with DH+ devices or PC-based tools. Compatible with SLC 5/04 controllers, the 1747-L542 is deployed in legacy automation networks that rely on DH+ networking and RS-232 interfaces for configuration and monitoring.
