利用自由通信口模式实现PLC与远程数据终端的信息传送

A Application About Information Transfered between PLC and DTE by Free Communication Port

介绍了SIMATICS7 2 0 0的通讯方式 ,利用其提供的自由通讯口模式解决PLC通过MODEM和数据终端的通信的方法 ,给出了硬件配置。

This paper introduces communication mode of SIMATIC S7\|200 and the method that can solve the communication problem between PLC and remote DTE(Data Terminal Equipment) by modem. It also provides the hardware configuration, communication protocol and software programming.