S7-200PLC的NETR与NETW指令在网络通讯中的应用

Low-cost Network Communication Based on S7-200PLC

对基于PPI协议的网络读写指令进行分析、研究,结合实例给出了基于PPI主站模式通讯网络连接的方法,阐述了网络通讯中数据交换的原理,并在此基础上叙述了软件的编程。

NETR and NETW instructions based on PPI protocol are analyzed and studied in this paper,provides the method of connecting communication network under the PPI main station mode,explains the principle of exchanging data and software programming.