SNP ID可能不正确。如果指定的SNP ID错误,也可能不能连接。如果不能确定一一个PLC的SNP ID是否正确而且想检测一下它,可以直接连接编程器到该PLC的编程口上,从软件的设定PLC ID屏上读取SNP ID,(上面描述了使用Logicmaster为–个PLC设定-个SNPID).确定编程软件的连接方式已更改为该测试要用的直接连接方式。当设置为直接连接后,不必考虑它的SNP ID,该软件将与直接相连的PLC进行通讯。
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