机构地区: 浙江大学材料与化学工程学院
出 处: 《化工自动化及仪表》 2006年第4期47-50,共4页
摘 要: 使用软件监听串口,记录Step7-M icro/W IN与S7-200 PLC通讯的PPI协议报文,参照PROFIBUS总线通讯协议,分析出PPI协议报文关键帧格式,实现读、写、锁定、解锁、连接测试、开停PLC等常用功能,可用于开发基于S7-200系列PLC、使用PPI协议进行通讯的上位机程序或轻量级的现场设备。 By monitoring serial port, logging PPI packages of which Step7 - Micro/WIN communicates with S7-200 series PLC ,referring to PROFIBUS specification,we obtain the key format of PPI protocol frame,which can accomplish most basic functions such as read data, write data, lock/unlock PLC memory, connection test, start/stop PLC and so on. It brings much convenience for monitor programs development and light field equipments interrelated with S7-200 series PLC.
领 域: [自动化与计算机技术] [自动化与计算机技术]