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 <description><![CDATA[Latest 50 replies of 求助，三菱PLC输出与继电器（输入一正一负 ..]]></description>
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 <description><![CDATA[com接电源正极，y接到中继正极，电源负极接中继负极]]></description>
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 <pubdate><![CDATA[Sat, 12 Apr 2014 02:26:45 +0000]]></pubdate>
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 <description><![CDATA[你把PLC的两个节点（即y和com）当成是个单级开关就是了。]]></description>
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