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 <title><![CDATA[问题求助]]></title>
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 <description><![CDATA[Latest 50 replies of 问题求助]]></description>
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 <description><![CDATA[说错了，是正逻辑与负逻辑，怎么选]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1548873#1803412.html]]></link>
 <author><![CDATA[471165265]]></author>
 <category><![CDATA[三菱工控论坛]]></category>
 <pubdate><![CDATA[Thu, 11 Aug 2016 15:02:56 +0000]]></pubdate>
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 <description><![CDATA[哥哥你理解错了，与脉冲输出高低电平有效有关，你这种回答错误千里]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1548873#1803379.html]]></link>
 <author><![CDATA[471165265]]></author>
 <category><![CDATA[三菱工控论坛]]></category>
 <pubdate><![CDATA[Thu, 11 Aug 2016 13:54:44 +0000]]></pubdate>
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 <description><![CDATA[正负脉冲指的时，脉冲输出带方向信号，正脉冲正转，负脉冲反转；还有一种方式是脉冲信号加方向信号，即一路是脉冲信号，不分正负，一路是方向信号。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1548873#1801732.html]]></link>
 <author><![CDATA[laihuaxun200]]></author>
 <category><![CDATA[三菱工控论坛]]></category>
 <pubdate><![CDATA[Sun, 07 Aug 2016 01:29:06 +0000]]></pubdate>
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