Allen-Bradley 1734-IB8 POINT I/O 8-Channel Sinking Input Module By wayne No Comments on Allen-Bradley 1734-IB8 POINT I/O 8-Channel Sinking Input Module 3 Min Read Buy the Allen-Bradley 1734-IB8 POINT I/O module. It features eight sinking inputs with 24VDC nominal voltage and user-selectable filters.