Allen-Bradley 1747-L404 SLC 500 Processor Module

Allen-Bradley 1747-L404 UNMP is a SLC 500 processor module that functions as the central processing unit for Allen-Bradley SLC 500 modular controllers. It is designed for installation in standard 1746 backplane chassis, where it runs user programs stored in the controller and manages data flow between I/O modules and field devices. As part of the 1747-Lxxx SLC 500 processor family, the module provides the core runtime environment for ladder logic programs, diagnostics, and basic communications within the chassis, enabling reliable local control for a range of automation tasks. Typical applications include compact machine control, packaging lines, conveyors, and small process loops where a dedicated PLC CPU is required in a compact footprint. For best results, ensure compatibility with your existing 1746-series hardware, confirm power requirements and backplane fit, and reference the official Rockwell Automation documentation for any model-specific notes, including supported I/O configurations and firmware compatibility.