Allen-Bradley 1747-L542 SLC 5/04 Processor Module

The Allen-Bradley 1747-L542 SLC 5/04 Processor Module is a SLC 500 CPU designed for modular control in legacy automation systems. It provides 32K of memory for program and data storage and includes an RS-232 serial port for programming and diagnostics alongside a Data Highway Plus (DH+) communications port for networked communication with other SLC devices and I/O modules. Built for use in standard 1747 backplane racks, this 5/04 processor sits within the 1747-L541/L542/L543 family and supports the KS/OS framework common to SLC 500 controllers. With its 32K memory, engineers can deploy mid-range control logic and data handling for discrete tasks, device coordination, and simple sequencing in compact rack installations. This module is well-suited for retrofits or new builds that rely on legacy Allen-Bradley networking and serial programming workflows, enabling reliable DH+ device networking and straightforward PC connections via RS-232.