通訊設可能不匹配。如果該PLC設置了串口通訊，而編程軟件的通訊設置沒有與之相匹配，也不能通訊。這些設置包括這些項:波特率，奇偶，結束位，等等。如果你懷疑這些設置有問題，試著直接連接該PLC,按照上面“SNP ID可能不正確”段落中講述的方法。如果直接連接也不能實現(xiàn)，可能是通訊設置不匹配。假如這樣的話，試著設置編程軟件為缺省的通訊設置.

 

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