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 <title><![CDATA[S7-200和变频器之间的通讯？]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418774.html]]></link>
 <description><![CDATA[Latest 50 replies of S7-200和变频器之间的通讯？]]></description>
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 <description><![CDATA[3楼正解，
如果只是高中低速，建议用开关量控制多段速很简单，没必要直接通讯]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418774#1419172.html]]></link>
 <author><![CDATA[cherywangf]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Thu, 14 Mar 2013 05:10:00 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[我有一个。 [attachment=100839]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418774#1412399.html]]></link>
 <author><![CDATA[hblovetian]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Thu, 21 Feb 2013 14:06:04 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[S7-200自由口与丹佛斯变频器通信可无极调速.]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418774#1404363.html]]></link>
 <author><![CDATA[hexdho]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 19 Jan 2013 05:09:15 +0000]]></pubdate>
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