OPC客户端与实时数据库通信的实现

在组态软件的数据流程中,一个关键要解决的问题是OPC客户端与实时数据库通信。本文分三个方面剖析了此过程,即OPC客户端初始化实时数据库,实时数据库写OPC服务器中的项,当OPC服务器中的项发生变化时写实时数据库相应TAGID值。本文将面向对象技术与传统的软件设计方法相结合,使用VC＋＋、COM等先进编程技术,讨论了OPC客户端和实时数据库通信的方法。

To Realize the Communications Between the OPC Clients and the RTDB

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.