I'm working for a Siemens RFID with model RF186C, I use OPC UA to connect with it, PLC works as OPC UA client, now the connection is established, I can read variables from the reader, but If have to use method call to read tag and write tag, If I want to use method call for read tag, I need assign some input and output parameters(arguments), the ReadTag method declared in reader is as following: ReadTag ( [in] ScanData Identifier [in] CodeTypeDataType CodeType [in] UInt16 Region [in] UInt32 Offset [in] UInt32 Length [in] ByteString Password [out] ByteString ResultData [out] AutoIdOperationStatusEnumeration Status); the problem is that there are some structures in the parametes which is not present in TwinCAT, for example I did the first parameter Identifier VAR _identifier : DWORD; END_VAR _paramCounterIn := _paramCounterIn + 1; _paramListIn[_paramCounterIn].IsString := FALSE; _paramListIn[_paramCounterIn].pString := ADR(_identifier); _paramListIn[_paramCounterIn].ParamAdr := ADR(_identifier); _paramListIn[_paramCounterIn].ParamSize := SIZEOF(_identifier); _inputArgInfos[_paramCounterIn].DataType := eUAType_UInt32; _inputArgInfos[_paramCounterIn].ValueRank := -1; _inputArgInfos[_paramCounterIn].ArrayDimensions[1] := 0; but it failed, sometimes it throws following error, does anyone have experience for method call with Opc UA, please give me some instruction, thanks! 0x E4DD 0105 UAC_E_ITEMTYPE Invalid or unsupported item type
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