摘要
西门子S7-200系列PLC的PPI通讯协议编程越来越多地被应用在许多工程项目中。对西门子S7-200系列PLC的PPI协议报文格式进行分析,并着重于混合类型多单元读取报文协议格式的分析研究,给出了构造基于PPI协议的各种命令格式的方案。
There are more and more applications of communications with PPI protocol programming in various engineering projects. Pay analyzing the PPI protocol message format of SIMENS S7-200 series PLC,this paper focuses on the format of that with mixed type and multiple unit in detail and give better solution of constructing any kinds of format of commands for reading or writing.
出处
《机械工程与自动化》
2009年第2期40-42,共3页
Mechanical Engineering & Automation
