Allen-Bradley 1794-OB16 Flex I/O 16-Channel Sourcing Output Module By wayne No Comments on Allen-Bradley 1794-OB16 Flex I/O 16-Channel Sourcing Output Module 2 Min Read Buy the Allen-Bradley 1794-OB16 Flex I/O DC output module. 16 sourcing channels at 24VDC, 500mA each. High shock/vibration rating. Shop now.