The COM UA Wrapper supports performing Write operations to DA servers of versions 2.05a and 3.

For version 2.05a, the COM UA wrapper creates a Group using the IOPCServer::AddGroup method and adds the items whose data is to be written using IOPCItemMgmt::AddItems method. The value is written for the items using the IOPCSyncIO::Write method. Note that if the StatusCode or TimeStamps (Source or Server) is specified to be written for the item then the COM UA Wrapper returns a BadWriteNotSupported Status code for the item.

For version 3, the COM UA Wrapper uses the IOPCItemIO::WriteVQT data including StatusCode and TimeStamp. If a SourceTimeStamp is provided, this timestamp is used for the Write else the ServerTimeStamp is used.

If there are errors for the items in the Write from the DA server, then these are mapped to the StatusCode for the corresponding item.

The mapping of the OPC COM DA Write Errors code to OPC UA Status code (in the COM UA Wrapper) is shown in Table A.63:

Table A.63 – OPC DA Write error code mapping

OPC DA Error ID	OPC UA Status Code
E_BADRIGHTS	Bad_NotWritable
DISP_E_TYPEMISMATCH	Bad_TypeMismatch
E_BADTYPE	Bad_TypeMismatch
E_RANGE	Bad_OutOfRange
DISP_E_OVERFLOW	Bad_OutOfRange
E_OUTOFMEMORY	Bad_OutOfMemory
E_INVALIDHANDLE	Bad_NodeIdUnknown
E_UNKNOWNITEMID	Bad_NodeIdUnknown
E_INVALIDITEMID	Bad_NodeIdInvalid
E_INVALID_PID	Bad_NodeIdInvalid
E_NOTSUPPORTED	Bad_WriteNotSupported
S_CLAMP	Good_Clamped
Others	Bad_UnexpectedError