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 <description><![CDATA[正/负逻辑就是常开与常闭的关系。]]></description>
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 <author><![CDATA[zhengfang]]></author>
 <category><![CDATA[三菱工控论坛]]></category>
 <pubdate><![CDATA[Thu, 09 Oct 2014 07:10:24 +0000]]></pubdate>
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 <description><![CDATA[带原点搜索的回原点，近点信号和零点信号的正负逻辑 是指改变PLC读取到信号的方式&nbsp;&nbsp;，极限信号我们一般使用常闭 一直有信号输出。]]></description>
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 <author><![CDATA[ycf1234123]]></author>
 <category><![CDATA[三菱工控论坛]]></category>
 <pubdate><![CDATA[Thu, 09 Oct 2014 05:14:05 +0000]]></pubdate>
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