Allen-Bradley 1734-IA4 POINT I/O 120VAC Input Module By wayne No Comments on Allen-Bradley 1734-IA4 POINT I/O 120VAC Input Module 2 Min Read The Allen-Bradley 1734-IA4 offers four sinking input channels for 120VAC signals. It draws 75 mA from the backplane and requires an external 85-132VAC supply.