Abstract:

In the transportation of configuration software, an important problem which needs to be solved is the communications between the OPC clients and the R TDB. The article analyses the transportation from three aspects, namely, the OPC clients＇ initialization of the RTDB, RTDB writing the items of the OPC  C server, and when the items of the OPC server change, writing the corresponding TAGID of the RTDB. The article combines the oriented-object technology  and the traditional methods of software designing,makes use of the advanced computer programming technologies such as VC＋ ＋ and COM, and discusses thee communication method between the OPC clients and the RTDB.

Key words: configuration software, RTDB, OPC, DLL