function uaReadAttribute(uaClient: TdOPCUAClient; NodeId: string; Attribute: integer ): variant;
var
S: uaRead;
ReadNode: uaReadValueId;
DataValue: uaDataValue;
begin
S := uaRead.Create(uaClient);
try
S.Request.NodesToRead_Setlength(1);
ReadNode := uaReadValueId.Create;
ReadNode.NodeId := uaStrToNodeId(NodeId);
ReadNode.AttributeId := Attribute; // we want to read a special attribute
S.Request.NodesToRead[0] := ReadNode;
S.Run;
DataValue := S.Response.Results[0];
uaClient.CheckStatusCode(DataValue.StatusCode); // if status code is not ok raise an exception
result := DataValue.Value.ToVariant;
finally
S.Free;
end;
end;
