【摘要】 PLC与上位机的串行通讯在现代工业控制中得到了越来越广泛的应用。PLC作为下位机完成现场各种开关量和模拟量的采集、运算和控制,上位计算机则可提供人机交互界面,实现数据的存储,打印以及现场数据的实时显示等监视功能。文章介绍了如何利用VB6.0实现OMRON CPM1A PLC与上位机的串行通讯,以及如何利用VB6.0进行实时曲线的绘制和显示,对普通的控制系统有重要的参考价值。更多还原

【Abstract】 The serial communication between PLC and Host computer has been used more and more widely in the field of modern industrial control. PLC is used to collect,calculate and control every kind of digital and anolog data, while the host computer can provide mutual interface, realizing the function of data saving, printing, and displaying.This paper introduces how to apply VB6.0 to realize the communication between PLC and Host Computer , and how to realize the display of real time curve. It has important reference value to general control systems.更多还原