Allen-Bradley 1746-IA4 SLC 500 4-Channel AC Input Module By wayne No Comments on Allen-Bradley 1746-IA4 SLC 500 4-Channel AC Input Module 2 Min Read Buy the Allen-Bradley 1746-IA4 SLC 500 Digital AC Input Module. It features 4 inputs and a 85-132V AC range. Order now for fast shipping.