84 Connect Devices WAGO-I/O-SYSTEM 750750-666/000-003 4FDI/2FDO 24V/10A PROFIsafe V2 iParManualVersion 1.2.0, valid from HW/SW Version 01/016.3.3.7 Switching Grounded LoadsFigure 40: Grounded load connectionWhen operating the PROFIsafe I/O module in the Output Configuration "H-Side/L-Side 1" (see Output Configuration parameter) and loads are switchedthat have a connection between digital power output O2A and the groundconnection (e.g., to improve EMC properties) and when the attached powersupply is connected between the common (ground) connection of the field supplyvoltage and the ground connection, then this type of circuit leads to detection of ashort circuit and to the "Short circuit to GND" diagnostic message.This occurs becuase the connection between output )2A and the groundconnection bridges digital power output O2A. As a remedy, the connectionbetween the ground connection and the common (ground) connection of the fieldsupply voltage must have a total resistance R E (see figure) of at least 70 kΩ.You can accomplish this by placing an additional resistor between the common(ground) connection of the field supply voltage and the ground connection.
