西门子小型PLC系统中的PPI通讯网络

PPI Communication Network in Mini Siemens PLC System

运用西门子PLC中的PPI(点对点)通信协议,构成以西门子s7-200PLC为核心的水处理系统中主从式通讯网络.以其中部分站点为例,详细介绍了PPI通讯物理层的制作和连接方法,同时给出了参数设置选择及软件设计方法.

By using PPI （peer to peer） communication protocol in Siemens PLC, the master - slave communi- cations network is eonstituted in the water treatment system with Siemens sT-2OOPLC as a core. Taking part of the sites as examples, the making of physical layer and conneet of the PPI communication is introduced, and the parameter setting selection and software design methods are proposed.