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 <title><![CDATA[学生遇到的问题......也许很简单]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941.html]]></link>
 <description><![CDATA[Latest 50 replies of 学生遇到的问题......也许很简单]]></description>
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 <description><![CDATA[步进解决一切问题]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1243901.html]]></link>
 <author><![CDATA[liubing3620]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 09 Apr 2012 09:28:42 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[我也是新手啊]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1243881.html]]></link>
 <author><![CDATA[x62010718]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 09 Apr 2012 09:07:31 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[quote]引用第2楼mspower于2012-03-30 11:50发表的&nbsp;&nbsp;:
使用步进指令会很方便
[/quote]


说得对，用GRAHP功能轻松搞定]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1243716.html]]></link>
 <author><![CDATA[zsh340]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 09 Apr 2012 05:51:24 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[用上电信号加限制]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1243672.html]]></link>
 <author><![CDATA[65407380c]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Mon, 09 Apr 2012 04:50:06 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[可以用DB块，除了具有保存功能还可以计算]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1240952.html]]></link>
 <author><![CDATA[萧峰]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Thu, 05 Apr 2012 03:06:16 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[前进状态m18.0置1，小车前进。到达终点复位m18.0.反向运行时m18.1置位，归零时m18.1复位，系统默认m18为断电保持，来电后小车会按原来方向运行。但实际工业中这样是不允许的，安全原因。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1240812.html]]></link>
 <author><![CDATA[jxj6570205]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Wed, 04 Apr 2012 19:16:40 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[来学习的 [s:39]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1238384.html]]></link>
 <author><![CDATA[ccyang0124]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 31 Mar 2012 12:55:56 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[我记得PLC内存中有一块是能够断电保持的，你查查看.这个真的有。 [s:21]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1238291.html]]></link>
 <author><![CDATA[叮咚]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 31 Mar 2012 10:48:44 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[慢慢来！！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1237425.html]]></link>
 <author><![CDATA[mhbxfys]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 30 Mar 2012 05:07:42 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[s:33] 伤不起，就一位大哥肯透露，沉默是金 [s:14]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1237394.html]]></link>
 <author><![CDATA[六月半夏]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 30 Mar 2012 04:27:51 +0000]]></pubdate>
</item>
<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[使用步进指令会很方便]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1237364.html]]></link>
 <author><![CDATA[mspower]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Fri, 30 Mar 2012 03:50:09 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[我是这样做的，笨笨的方法，当小车运动，触发一个标志位，就像单片机那样，前进时，给字元件送1，到达目的地后送0，后退时，给另一个字元件送1，到达目的地，送0复位，这样断电也不怕。在0B100中检测字元件的状态，若为1，就置位相应的输出，并把字送0复位。好麻烦...... [s:32]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-144941#1237079.html]]></link>
 <author><![CDATA[六月半夏]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Thu, 29 Mar 2012 14:04:19 +0000]]></pubdate>
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