SNP ID可能不正確。如果指定的SNP ID錯誤，也可能不能連接。如果不能確定一一個PLC的SNP ID是否正確而且想檢測一下它，可以直接連接編程器到該PLC的編程口上，從軟件的設(shè)定PLC ID屏上讀取SNP ID，(上面描述了使用Logicmaster為–個PLC設(shè)定-個SNPID).確定編程軟件的連接方式已更改為該測試要用的直接連接方式。當設(shè)置為直接連接后，不必考慮它的SNP ID，該軟件將與直接相連的PLC進行通訊。

 

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