Allen-Bradley 1745-E103 Expansion Module Small

The Allen-Bradley 1745-E103 Expansion Unit Small is a compact expansion module for the SLC-100 controller family, designed to add additional I/O capacity to a Rockwell Automation SLC 100 system. Identified by part number 1745-E103, this unit is described in official catalogs as the Expansion Unit Small for SLC 100 installations. In practice, it is installed alongside a compatible SLC 100 CPU and 1745-series I/O modules to extend control capabilities for machines or production lines without replacing the main controller. The product is manufactured by Allen-Bradley (Rockwell Automation) and appears in the 1745-E10x expansion family as the small expansion option. When selecting this part, verify compatibility with your specific SLC 100 CPU, expansion backplane, and I/O rack layout according to Rockwell Automation documentation and the seller’s specifications.