code: def write_by_name(self, data_name, value, plc_datatype):
          # type: (str, Any, Type) -> None
          
          if self._port:
              return adsSyncWriteByNameEx(
                  self._port, self._adr, data_name, value, plc_datatype
              )
docs: Send data synchronous to an ADS-device from data name.
  
          :param string data_name: PLC storage address
          :param value: value to write to the storage address of the PLC
          :param int plc_datatype: type of the data given to the PLC,
              according to PLCTYPE constants