Transmitter wirring to twido

HI ALL
i use the twido base unit for plc with 6ht card fo input output analog card .and a humidity transmiter(siemens qfm2171) with 4~20ma output .
according to 6ht wirring diagram there is two connection for 4~20ma (+ and -) but the transmitter has one connection 24vdc for transmitter power supply(G) and only one analoge output connection(I1).
COLUD U PLZ HELP ME TO SOLVE THIS PROBLEM

the anaolg output is connected to the +of the card and the minus to the - of the power supply.