Allen-Bradley 1794-OV16 Flex I/O Digital Sinking Output Module By wayne No Comments on Allen-Bradley 1794-OV16 Flex I/O Digital Sinking Output Module 3 Min Read Buy the Allen-Bradley 1794-OV16 Flex I/O module with 16 sinking outputs. It offers 500mA per channel and 24V DC nominal voltage for reliable control.