利用visual basic所开发的opc客户端应用程序主要采用自动化通信接口和opc服务器程序实施通信。而opc基金会提供的opc自动化接口 opcdaauto.dll动态链接库集成了所有用于对opc服务器进行访问的对象、属性和方法，为利用visual basic开发opc客户端应用程序提供了极大方便。程序设计时，opc客户程序应当首先生成opc服务器支持的opc对象，然后再使用opc对象支持的属性和方法，实现对opc服务器的操作和访问。

-OPC client application using the visual basic developed by the main use of automation communication interface and OPC communications server program implementation. The OPC foundation OPC automation interface opcdaauto.dll dynamic link library integrates all the properties and methods for object, access to the OPC server, which provides convenience to use visual basic development of OPC client application. The program design, the OPC client should first generation OPC server to support OPC object, and then use the properties and methods of OPC object supports, realize the operation and access to the OPC server.