The Allen-Bradley 1797-OB4D FLEX Ex is a four-point digital output module for FLEX I/O that provides four 24V DC sourcing outputs for connected field devices in hazardous locations. It is powered by a 24V DC supply and specified to operate from -20 to 70°C, with the FLEX Ex design enabling installation in potentially explosive environments. This model is listed by Rockwell Automation as discontinued as of December 31, 2017.
