Allen-Bradley 1747-L541 SLC 500 16 Point IO Module

The Allen-Bradley 1747-L541 SLC 500 System Processor (CPU) is the central controller for SLC 500 automation configurations, specifically the SLC 5/04 platform, and is documented as Rev 7. This CPU module provides 16K words of memory for user programs and data, enabling mid‑range PLC tasks to be stored and executed within a 30‑slot backplane environment. It functions as the system processor in a 1747 backplane and coordinates with a broad set of 1747 I/O modules to manage discrete automation tasks. For communications, the L541 offers an RS‑232 serial port for programming and a DH+ network interface to exchange data with other controllers and field devices. Depending on configuration, program scan times can be on the order of 0.9 ms per keyword and I/O scan times around 0.225 ms, supporting responsive control for typical SLC 500 applications. As part of the Rockwell Automation SLC 500 ecosystem, the 1747-L541 is suitable for installations that require a compact, proven CPU with legacy I/O compatibility and straightforward integration with existing 1747 modules.