PLC program in accordance with the definition of communication protocols (ie, PLC-frame format to receive information and definitions) to identify its information content. Through the PC s COM1 and S7-200 PLC s RS 1 232 serial port hardware connection, and then through the S7-200 series PLC to communicate programming, you can achieve with the host computer communications.

2)PC与PLC串行通信在专用加工机床上的应用.pdf

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