LabVIEW与S7-200PLC基于PPI协议通讯的设计与实现

Design and Implementation of Data Communication between LabVIEW and S7-200 PLC Based on PPI Protocol

针对工控领域中实时监控S7-200PLC状态和显示、处理其采集数据的需求，使用LabVIEW作为开发平台，通过调用VISA接口函数，在分析PPI协议读写指令的基础上，实现了LabVIEW与PLC串口通讯。

In allusion to the demands of real-timely monitoring the statuses of S7-200 PLC and displaying and processing its collected data in the domain of industrial control, by using LabVIEW as a development platform, the data communication between LabVIEW and S7-200 PLC via the serial port is realized by means of calling the VISA interface function and on the basis of analyz- ing read- write commands of PPI protocol.