UnitsNot all unit versions are available as 3D data for download. The 3D data is named as follows: "Fieldbus" is the appropriate fieldbus variant, the data contains only 1 bus with the appropriate connections. The mechanical difference of the control units consists in the different fieldbus connections. "x" describes the control unit variants "B" = without RS232 interface and "C" with RS232 interface and "y" describes the types "O" = optocoupler units and "R" = relay devices. ("O" and "R" = no mechanical difference).