Allen-Bradley 1794-OE8H FLEX I/O HART Analog Output Module By wayne No Comments on Allen-Bradley 1794-OE8H FLEX I/O HART Analog Output Module 3 Min Read Buy the Allen-Bradley 1794-OE8H FLEX I/O HART module. It features 8 analog outputs with a 0 to 20 mA range and local microprocessor intelligence.