通訊設(shè)可能不匹配。如果該P(yáng)LC設(shè)置了串口通訊，而編程軟件的通訊設(shè)置沒有與之相匹配，也不能通訊。這些設(shè)置包括這些項(xiàng):波特率，奇偶，結(jié)束位，等等。如果你懷疑這些設(shè)置有問題，試著直接連接該P(yáng)LC,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(shí)現(xiàn)，可能是通訊設(shè)置不匹配。假如這樣的話，試著設(shè)置編程軟件為缺省的通訊設(shè)置.

 

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