微型计算机与PLC的串行通信方法

The method of serial communication between computer and PLC

根据一个电梯的监控事例 ,详细介绍了利用 VB6.0中的 MSComm通信控件与可编程逻辑控制器 PLC进行通信的方法 ,给出了相关的通信协议和数据帧格式 ,以及通信双方的部分通信程序片断 。

According to an example of a remote controlled elevator,the means that a computer communicate with a PLC by MSComm control in VB6 0 is introduced.The relative communication protocol and data frame and some pieces of their programs are presented.