Allen-Bradley 1747-L40B Processor Unit is a fixed-hardware style SLC 500 controller that consolidates a CPU and a built-in power supply with 40 I/O points in a single module for compact control tasks. The unit offers 1,024 instruction capacity (1K) and provides two expansion slots for adding additional 1747 modules within the same rack. It is powered from 100/265 VAC at 50/60 Hz, and the 1747-L40B is a discontinued model suited for small-to-mid size discrete automation in SLC 500 systems.
