Allen-Bradley 1747-L541 SLC 500 Processor CPU

The Allen-Bradley 1747-L541 SLC 5/04 Processor is a 16K-memory CPU designed for the SLC 500 family, intended to be installed in a 1747-series rack to run ladder logic for discrete-control applications. It provides a serial RS-232 port for local programming and a DH+ (High-Speed Data Highway) port for networked I/O and device communication, enabling reliable stand-alone or small‑scale automation architectures. The unit features 16K words of user memory for programs and data, supporting typical SLC 500 logic sizes, with a program scan time of about 0.9 milliseconds per keyword, which helps deliver responsive control in real-time applications. This processor is compatible with standard SLC 500 I/O modules within the same chassis, making it suitable for compact conveyor, packing, machine-tend and batching tasks in manufacturing environments where a fixed, modular PLC solution is appropriate. As part of the SLC 500 ecosystem, the 1747-L541 remains a rugged, widely-deployed option for legacy systems or upgrades that rely on the 1747 hardware family’s communication and I/O design.