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 <title><![CDATA[如何实现西门子s7200 的倒计时设计，请大 ..]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206.html]]></link>
 <description><![CDATA[Latest 50 replies of 如何实现西门子s7200 的倒计时设计，请大 ..]]></description>
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 <title><![CDATA[工控人家园]]></title>
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 <description><![CDATA[工控人家园]]></description>
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 <title><![CDATA[]]></title>
 <description><![CDATA[非常感谢，终于搞定。。。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1523015.html]]></link>
 <author><![CDATA[无冕心君]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 16 Dec 2013 05:07:50 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[方法有几种，主要看个人思维，上面几楼的方法都可以的啊！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1519276.html]]></link>
 <author><![CDATA[chenji06]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 06 Dec 2013 09:02:06 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[5楼可以说的详细些吗？
具体指令介绍些，谢谢]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1519105.html]]></link>
 <author><![CDATA[wangchangxi]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 06 Dec 2013 02:04:04 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[如果以分钟来做倒计时的话可以用SM0.4来触发一个计数器C0&nbsp;&nbsp;.假如设定VW0=30分钟的倒时计就用VW0-C0＝VW2&nbsp;&nbsp;这样VW2的值就是30 29&nbsp;&nbsp;28&nbsp;&nbsp;27&nbsp;&nbsp;26&nbsp;&nbsp; 。。。。0]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1517431.html]]></link>
 <author><![CDATA[lijinniu]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 02 Dec 2013 03:29:38 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[直接用延时计时器编程就可以了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1516546.html]]></link>
 <author><![CDATA[hzcck1125]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 29 Nov 2013 08:44:54 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[30分钟倒计时器]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1516500.html]]></link>
 <author><![CDATA[sanlihu]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 29 Nov 2013 07:53:43 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用定时器加记数器配合使用，很方便的]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1516319.html]]></link>
 <author><![CDATA[danwei]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 29 Nov 2013 02:25:54 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[是以分计时还是以秒计时，可以用计数器做。SM0.4和SM0.5是分和秒的时基]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1443206#1515979.html]]></link>
 <author><![CDATA[beichen]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Thu, 28 Nov 2013 05:37:21 +0000]]></pubdate>
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