基于VB的上位机与PLC通信系统实现

The Communication System of Host Computer Based on VB and PLC

在开发的汽车车桥性能检测的试验系统中,需要无级变速的交流电机作为动力输入。为实现对交流电机的控制检测,采用了一种利用VB6.0串口通信控件MsComm实现计算机与PLC之间进行通信的方法,来实现计算机对PLC的参数传递、运行以及对其进行实时监控,从而实现对交流电机的控制。实验结果表明,利用VB自身提供的串口通信控件MsComm很好的实现了上位工控机对交流电机的监控。

In the experimental of checking and measuring the motor vehicle bridge’s function,the successive changing speed AC electromotor provide power.In order to control and monitor the AC electromotor,a method of communication between a host computer and PLC is introduced with Microsoft Communication Control based on Visual Basic 6.0,which realizes the transmission of parameters,the control of running and real-time supervision of PLC and the control of AC electromotor by the host computer.The results indicate that the host computer monitor the PLC well using Microsoft Communication Control based on Visual Basic 6.0.