Allen-Bradley 1746-FIO4I SLC 500 Fast Analog I/O Module By wayne No Comments on Allen-Bradley 1746-FIO4I SLC 500 Fast Analog I/O Module 3 Min Read Buy the Allen-Bradley 1746-FIO4I SLC 500 fast analog I/O module. It features 2 inputs, 2 outputs, 12-bit resolution, and a 7 kHz bandwidth. Order now for fast shipping.