dOPC Client Toolkit Help file
TdOPCGroup.SyncWrite Method
public: __fastcall boolean SyncWrite(
    TdOPCItemList aItemList = nil
public boolean SyncWrite(
    TdOPCItemList aItemList
Visual Basic
Public Function SyncWrite(
    aItemList As TdOPCItemList = nil
) As boolean

SyncWrite performs a synchronous write of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.

The result will be True on successful execution, otherwise False. The function runs to completion before returning because the values are written directly to the physical device. So the function should not return until it is verified that the device has actually accepted or rejected the data. Writing to the device is not affected by the Active state of the group or item.

  ItemList : TdOPCItemList;
  ItemList := TdOPCItemList.Create(OPCServer.OPCGroups[i]); //we want to write new values to all Items of the first Group
  for i := 0 to ItemList.Count-1 do
    ItemList[i].WantValue := random(100);
  OPCServer.OPCGroups[i].SyncWrite(ItemList); //write values to OPC server
  ItemList.CheckOPCErrors('Write Items...',false); //show errors
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