Description: S7-200 PLC via PPI protocol of the hardware and software methods of listening, analyzing the internal PLC inherent PPI protocol, then the host computer using VB programming, follow the PPI protocol, read and write PLC data to achieve man-machine task. This communication method, and the general freedom of communication protocols, communication is omitted PLC programming, just the preparation of PC communication program resources
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plc200 vb.docx
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