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 <title><![CDATA[s7-200不能通讯]]></title>
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 <description><![CDATA[USB转485吧，能行]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1481532#1665328.html]]></link>
 <author><![CDATA[qjpasll]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 09 May 2015 06:39:41 +0000]]></pubdate>
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 <description><![CDATA[[quote]引用楼主mao19680816于2015-03-28 17:13发表的 s7-200不能通讯 :
你好请问&nbsp;&nbsp;用USB接口下载的程序，用串口不能通讯吗
[/quote]
S7-200有USB口?还是用的USB转接的通讯线?
如果定义了自由口通讯，且PLC在RUN状态，则不能用编程软件通讯的。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1481532#1653905.html]]></link>
 <author><![CDATA[guochunyi]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sun, 29 Mar 2015 07:39:34 +0000]]></pubdate>
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