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 <title><![CDATA[这个问题咋办？]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499.html]]></link>
 <description><![CDATA[Latest 50 replies of 这个问题咋办？]]></description>
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 <title><![CDATA[工控人家园]]></title>
 <link><![CDATA[http://www.ymmfa.com]]></link>
 <description><![CDATA[工控人家园]]></description>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[s:17] 学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1166378.html]]></link>
 <author><![CDATA[sport1988]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Fri, 18 Nov 2011 01:13:31 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[总结：
把四只号放大器的全部输出设置为：当光纤信号入大器检测到有产品时，放大器无信号输出，无产品时有信号输出，再把四只光电放大器输出信号并在一起，接入一个共同的输入端口 
表现为：当四只光纤信号放大器检测到都有产品时，PLC无信号输入时即为OK]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1166147.html]]></link>
 <author><![CDATA[张平全]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Thu, 17 Nov 2011 12:26:53 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用一个四输入的与门实现]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1165944.html]]></link>
 <author><![CDATA[airwei]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Thu, 17 Nov 2011 00:48:28 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[quote]引用第4楼yahzubao08于2011-11-14 13:19发表的&nbsp;&nbsp;:
楼上的老兄讲得有道理,不过应是常闭的吧
[/quote]
用常闭就要串了，]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1165662.html]]></link>
 <author><![CDATA[xshflove]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Wed, 16 Nov 2011 12:06:07 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[综合三四楼的提示，多谢指点，成了！谢谢！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1165653.html]]></link>
 <author><![CDATA[张平全]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Wed, 16 Nov 2011 11:58:56 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[楼上的老兄讲得有道理,不过应是常闭的吧]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1163871.html]]></link>
 <author><![CDATA[yahzubao08]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Mon, 14 Nov 2011 05:19:46 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[呵呵，四个输入开关用常开点，并连接到输入的一个点上。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1163807.html]]></link>
 <author><![CDATA[xshflove]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Mon, 14 Nov 2011 03:56:20 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[你也太省了，如果很多这个情况，用5个光耦，1个与门]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1163732.html]]></link>
 <author><![CDATA[yl_pan]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Mon, 14 Nov 2011 02:30:18 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[这个应该比较难吧]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-126499#1163160.html]]></link>
 <author><![CDATA[ccy5156]]></author>
 <category><![CDATA[资料互助]]></category>
 <pubdate><![CDATA[Sun, 13 Nov 2011 03:30:24 +0000]]></pubdate>
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