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 <title><![CDATA[西门子PLC 的单极性 跟双极性]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418336.html]]></link>
 <description><![CDATA[Latest 50 replies of 西门子PLC 的单极性 跟双极性]]></description>
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 <description><![CDATA[-500---500 我也可以选择单极性的&nbsp;&nbsp;对应0到5]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418336#1401938.html]]></link>
 <author><![CDATA[huangpeng]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 13 Jan 2013 14:31:40 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[没看懂什么意思]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418336#1401937.html]]></link>
 <author><![CDATA[sunzhihaowy]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 13 Jan 2013 14:31:12 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[应该是楼上版主说的！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418336#1401906.html]]></link>
 <author><![CDATA[slik]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 13 Jan 2013 13:28:50 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[单/双极性根据传感器反馈的模拟量有无过零来选择。
比如-500---500对应-5V---+5V就选择双极性。对应0-10v就选择单极性。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1418336#1401871.html]]></link>
 <author><![CDATA[sjm213]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 13 Jan 2013 11:58:00 +0000]]></pubdate>
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