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 <title><![CDATA[关于能否用温差和压差两个参数控制同一台 ..]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221.html]]></link>
 <description><![CDATA[Latest 50 replies of 关于能否用温差和压差两个参数控制同一台 ..]]></description>
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 <description><![CDATA[可以的，]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1478571.html]]></link>
 <author><![CDATA[mhbxfys]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 24 Aug 2013 14:42:35 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[就个不一定就是PID 控制，。
也可能是2路信号相加呢。。。或是相减呢，等等。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1478487.html]]></link>
 <author><![CDATA[江苏文彬工控]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 24 Aug 2013 11:13:11 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[前提你变频器有连个PID控制回路 [s:26]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1477441.html]]></link>
 <author><![CDATA[hbrrn]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Wed, 21 Aug 2013 12:17:26 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[新手不太懂]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1477374.html]]></link>
 <author><![CDATA[岭南自动化]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Wed, 21 Aug 2013 08:56:59 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[当然可以，这就是所谓的PID串级控制。外环是压差，内环是温度。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1477353.html]]></link>
 <author><![CDATA[beichen]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Wed, 21 Aug 2013 08:00:52 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[有没有大神啊]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1435221#1477323.html]]></link>
 <author><![CDATA[大头葱]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Wed, 21 Aug 2013 07:20:46 +0000]]></pubdate>
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