品牌:其他 | 规格:Mitsubishi Q02CPU | 材质:Mitsubishi Q02CPU |
产地:法国 |
Mitsubishi Q02CPU
Mitsubishi Q02CPU
Mitsubishi Q02CPU
SIEMENS S7-200PLC的编程通讯接口,内部固化的通讯协议为PPI协议,如果上位机遵循PPI协议来读写PLC,就可以省略编写PLC的通讯代码。如何获得PPI协议?可以在PLC的编程软件读写PLC数据时,利用第三个串口侦听PLC的通讯数据,或者利用软件方法,截取已经打开且正在通讯的端口的数据,然后归纳总结,解析出PPI协议的数据读写报文。这样,上位机遵循PPI协议,就可以便利的读写PLC内部的数据,实现上位机的人机操作功能。
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