Allen-Bradley 1747-L40B SLC 500 Processor Unit is a fixed controller in the SLC 500 family, serving as the central CPU for compact, rack-based automation systems. The Series B 1747-L40B provides 40 input/output points and is AC-powered, with built-in DH-485 serial communications for networked device communication, compatible with RSLogix 500 programming. As a fixed CPU in a backplane-based chassis, it is designed for straightforward ladder logic control in small-scale machine control and sequencing tasks.
