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 <description><![CDATA[Latest 50 replies of 一个触摸屏，三个S7-200之间的PPI通信]]></description>
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 <description><![CDATA[PPI是主从通讯，触摸屏是主站，PLC只能是从站，并且只能有一个是主站]]></description>
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 <pubdate><![CDATA[Sun, 19 Feb 2012 06:31:54 +0000]]></pubdate>
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一样问题共同探讨]]></description>
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 <pubdate><![CDATA[Sat, 11 Feb 2012 15:40:49 +0000]]></pubdate>
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