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 <title><![CDATA[S7_200脉冲输出问题]]></title>
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 <description><![CDATA[Latest 50 replies of S7_200脉冲输出问题]]></description>
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 <description><![CDATA[跟据用途来决定呀]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1441434#1505717.html]]></link>
 <author><![CDATA[sanlihu]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Tue, 05 Nov 2013 03:42:29 +0000]]></pubdate>
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 <description><![CDATA[PWM是可调脉冲占空比，用于模拟量控制。PTO是脉冲串输出，PTO常见的占空比是50%，用于步进电机等控制。PWM可理解为100%输出时为全高电平，0%输出是为全低电平，50%输出是高为一半，低为一半。。。。你很快就会的]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1441434#1504766.html]]></link>
 <author><![CDATA[teng_hua]]></author>
 <category><![CDATA[西门子工控论坛]]></category>
 <pubdate><![CDATA[Sat, 02 Nov 2013 14:31:00 +0000]]></pubdate>
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