An idea of dual network SCADA system is proposed and the function design, implementation method and programming interface of dual network communication software are introduced.
提出了采用双网络结构的思想，并详细介绍了双网络通信软件的功能设计、实现方法及编程接口。
The principle of users programming for field communication protocol and the development of the software for graphics-oriented programming interface are described.
本文论述了现场通信协议用户可编程的原理，以及面向图形的可编程界面软件的开发。
The paper introduce the condition of communicating between person computer and PLC, the person computer asynchronism adapter and the high programming language communication interface principle of PLC.
重点介绍了个人计算机与PLC连网通信的条件、个人计算机的异步通信适配器、以及运用高级语言编写个人计算机与PLC通信的接口程序原理。
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