The Allen-Bradley 1745-E151 Expansion Unit is a SLC-150 I/O expansion module that attaches to the SLC-150 controller backplane to extend the host PLC’s input and output capability. It provides 20 external I/O input circuits and 12 external I/O output circuits, with inputs rated for 85-132 V AC at 50/60 Hz in a current-sinking configuration. This expansion unit is used to scale discrete I/O for automation tasks such as sequencing, machine control, and process control within the SLC-150 family.
