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 <title><![CDATA[在学习三菱PLC遇到的简单问题。]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566.html]]></link>
 <description><![CDATA[Latest 50 replies of 在学习三菱PLC遇到的简单问题。]]></description>
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 <title><![CDATA[工控人家园]]></title>
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 <description><![CDATA[参考一楼说的。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1085472.html]]></link>
 <author><![CDATA[lsj123]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Tue, 05 Jul 2011 16:24:03 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[&quot;上升沿是接通触发。。。下降沿是断开触发。。。&quot;]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1084021.html]]></link>
 <author><![CDATA[黑马87]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 03 Jul 2011 12:37:45 +0000]]></pubdate>
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 <description><![CDATA[用下降沿的意思就是碰到x2开关后,梯形图对应的位置是不闭合的,而是等x2从接通到断开的一瞬间,接通一个扫描周期,这正符合车入库的客观规律,之后由x4断开y1.]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083927.html]]></link>
 <author><![CDATA[slik]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 03 Jul 2011 08:41:04 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[上升沿是接通触发。。。下降沿是断开触发。。。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083841.html]]></link>
 <author><![CDATA[kkwvfqjh]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 03 Jul 2011 05:32:18 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用后沿是必须的撒 [s:32]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083431.html]]></link>
 <author><![CDATA[农村娃]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sat, 02 Jul 2011 11:00:52 +0000]]></pubdate>
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 <description><![CDATA[楼主会看时序图吗?会看就明白了。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083350.html]]></link>
 <author><![CDATA[路在何方]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sat, 02 Jul 2011 07:50:30 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[同上。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083126.html]]></link>
 <author><![CDATA[liupengshuai]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 01 Jul 2011 22:59:42 +0000]]></pubdate>
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 <description><![CDATA[这样是为保证你车是在通过了X2复位后才给关门信号]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083124.html]]></link>
 <author><![CDATA[shi2999]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 01 Jul 2011 22:51:58 +0000]]></pubdate>
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 <description><![CDATA[你试想下如果是上升沿的话，那么当小车前部碰到X02时自动门就下降了，这个时候小车没有完全进入车库呢！不是很危险。这里用下降沿很正确，当小车完全进入了车库脱离了X02自动门开始下降。很正确啊！多注意下生活里的东西。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112566#1083118.html]]></link>
 <author><![CDATA[源源]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 01 Jul 2011 17:43:37 +0000]]></pubdate>
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