计算机与PLC通信技术的研究

Research on communication techniques between commputer and PLC

利用Mscomm控件,在Windows环境下串行通信的程序设计,完成了控制系统中下位机PLC与上位计算机之间的串行通信,着重介绍了系统的通信协议及通信程序的设计方法。

This paper introduces the design of serial communication program using Mscomm control unit under Windows,which complete the communication between commputer with PLC in control system, and puts emphasis on communication protocol of the system and design method of communication program.