Allen-Bradley 1747-L531 Programmable Logic Controller Processor Module

The Allen-Bradley 1747-L531 is a SLC 500 series CPU (5/03) processor module designed to plug into a compatible SLC 500 rack for compact, rack-based control. It provides 8K of memory for user program and data and includes an RS-232 port for direct programming and a DH-485 port for serial network communication with other controllers and devices. This module ships with OS 1747-OS302 firmware (Series C), FRN 6, enabling compatibility with RSLogix 500 projects built for 5/03 CPUs. As part of the 1747-L531 family, it is commonly used in small to mid-size automation tasks such as conveyors, pumps, and packaging lines where a robust, rack-mounted processor is required. Designed to operate within Rockwell Automation's SLC-500 ecosystem, it supports standard SLC 500 I/O addressing and sequencing through the built-in processor and data highway network.