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 <title><![CDATA[请教有关300 定时器的问题]]></title>
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 <description><![CDATA[Latest 50 replies of 请教有关300 定时器的问题]]></description>
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 <description><![CDATA[S_ODT是接通延时定时器，在梯形图中是以SD为标号的，它的常闭点是在启动使能信号保持到定时时间到后断开，所以你的理解是正确的。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-59307#755333.html]]></link>
 <author><![CDATA[szzhang001]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 03 Apr 2010 12:12:05 +0000]]></pubdate>
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 <description><![CDATA[不知道，看下边]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-59307#755210.html]]></link>
 <author><![CDATA[feng157663]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 03 Apr 2010 08:20:40 +0000]]></pubdate>
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