微机监控系统中PLC与上位机通信的研究

Study on Communication between PLC and Upper Computer in Microcomputer Supervising System

以美国ＧＥ公司的ＰＬＣ产品为例，着重介绍了ＣＭＭ３１１ 通信模块的应用，阐述了发电厂循环水监控系统中上。

With an example of GE Company's PLC,the application of the communication module board titled CMM311 is emphatically introduced.The method of accomplishment of communication process between the upper and lower computers in the supervising system of circulating water of a power plant is represented.