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 <title><![CDATA[关于比例阀的接线]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583.html]]></link>
 <description><![CDATA[Latest 50 replies of 关于比例阀的接线]]></description>
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 <title><![CDATA[工控人家园]]></title>
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 <description><![CDATA[可能是+24V，-24V（铜丝网）共用，输入、输出信号共4根线。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1364630.html]]></link>
 <author><![CDATA[hls63]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 24 Oct 2012 08:22:46 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[也有可能是有源式的（四线式），24V电源和信号共4线，部分元件电源和讯号0V共用，表现为3线，铜丝网是屏蔽]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1360688.html]]></link>
 <author><![CDATA[xuliuqing200]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Thu, 18 Oct 2012 02:58:56 +0000]]></pubdate>
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 <description><![CDATA[上个图片看看啊。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1360556.html]]></link>
 <author><![CDATA[weilinyi]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Thu, 18 Oct 2012 00:12:52 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1360428.html]]></link>
 <author><![CDATA[sk502147]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 17 Oct 2012 13:22:08 +0000]]></pubdate>
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 <description><![CDATA[有一种比例阀自己带放大器，只要接DC24V电源，另外接一根0—10V控制讯号即可工作。所以只有四根线。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1360411.html]]></link>
 <author><![CDATA[znz43]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 17 Oct 2012 12:56:02 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[什么型号啊？ 楼主……]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1407583#1360379.html]]></link>
 <author><![CDATA[f2830565]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 17 Oct 2012 12:18:45 +0000]]></pubdate>
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