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 <title><![CDATA[新手请教一个编程的问题！]]></title>
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 <description><![CDATA[Latest 50 replies of 新手请教一个编程的问题！]]></description>
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 <description><![CDATA[好久没上来了，非常感谢]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-38004#541521.html]]></link>
 <author><![CDATA[hy981]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 05 Jun 2009 17:05:00 +0000]]></pubdate>
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 <description><![CDATA[[attachment=23722] 

类似的做成几个子程序，在主程序中，使用条件语句，比如：
if&nbsp;&nbsp; MB0=1&nbsp; than call sub0 (左起)
if&nbsp;&nbsp; mb0=-2 than call sub1（右起）
if&nbsp;&nbsp; mb0=3 than call sub2（中起）
if&nbsp;&nbsp;mb0=0 than call sub3 (关闭所有龙头)
if mb0=255 than call sub4(开启所有 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-38004#531156.html]]></link>
 <author><![CDATA[醉湮邃虞]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Tue, 26 May 2009 15:42:40 +0000]]></pubdate>
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 <description><![CDATA[能详细一点讲一下吗，谢谢]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-38004#531062.html]]></link>
 <author><![CDATA[hy981]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Tue, 26 May 2009 14:21:59 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用比较指令就可以了.]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-38004#530715.html]]></link>
 <author><![CDATA[gang.liu9]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Tue, 26 May 2009 10:49:50 +0000]]></pubdate>
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