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 <title><![CDATA[plc元件映像寄存器]]></title>
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 <description><![CDATA[Latest 50 replies of plc元件映像寄存器]]></description>
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 <description><![CDATA[楼主说的——“下个扫描周期没按下I0.0，Q4.0会不会接通呢？” ——其实我是这样理解的：&nbsp;&nbsp;&nbsp;&nbsp;没按I0.0，那么M4.0也就没有得电（即使它曾经得过电）； Q4.0得电的先决条件是M0.0必须得电，所以，此时Q4.0就不会有电啦~

“元件映像寄存器里的内容在下个扫描周期内还保持上次的吗？” ——不会。因为新 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1379442#1282718.html]]></link>
 <author><![CDATA[ukqbso]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 06 Jun 2012 05:25:49 +0000]]></pubdate>
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 <description><![CDATA[[url]http://www.ymmfa.com/read-gktid-32912.html[/url]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1379442#1282707.html]]></link>
 <author><![CDATA[sjm213]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 06 Jun 2012 05:12:54 +0000]]></pubdate>
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 <description><![CDATA[楼上说得很好]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1379442#1282415.html]]></link>
 <author><![CDATA[linxianqiang]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 05 Jun 2012 17:00:48 +0000]]></pubdate>
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 <description><![CDATA[先执行外部输入更新，I0.0= ON,执行梯形图扫描，因为M0.0=OFF,Q4.0=OFF;I0.0=ON,M0.0=ON
执行外部输出更新，Q4.0=OFF,(内部M0.0=ON)
执行外部输入更新，I0.0=OFF
执行梯形图扫描，因M0.0=ON,Q4.0=ON;I0.0=OFF,M0.0=OFF
执行外部输出更新，Q4.0=ON,(内部M0.0=OFF)
执行外部输入更新，I0.0=OFF
梯形图扫描，Q4.0=OFF,M0.0=O ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1379442#1282160.html]]></link>
 <author><![CDATA[znz43]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 05 Jun 2012 09:06:15 +0000]]></pubdate>
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 <description><![CDATA[[attachment=85674] 图]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1379442#1282100.html]]></link>
 <author><![CDATA[kashsee]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 05 Jun 2012 07:54:24 +0000]]></pubdate>
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