public static extern PLC_Read *_ReadPLCData( Eip_Session *session, Eip_Connection *connection, DHP_Header *dhp, byte *routepath, byte routepathsize, Plc_Type type, short tns, string address, short number);
public static extern int _WritePLCData( Eip_Session *session, Eip_Connection *connection, DHP_Header *dhp, byte *routepath, byte routepathsize, Plc_Type type, short tns, string address, PLC_Data_Type datatype, void *data, short number);