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 <title><![CDATA[大家说说PLC的编程口与触摸屏通讯&nbsp;& ..]]></title>
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 <description><![CDATA[Latest 50 replies of 大家说说PLC的编程口与触摸屏通讯&nbsp;& ..]]></description>
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 <description><![CDATA[看现场环境，要长距离，最好使用485或422。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1082056.html]]></link>
 <author><![CDATA[fubin739]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Thu, 30 Jun 2011 04:30:08 +0000]]></pubdate>
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 <description><![CDATA[RS232最大传输距离50米；RS-422/RS-485最大传输距离1200米实际上不要超过500米，否则出现一些通讯故障]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1081924.html]]></link>
 <author><![CDATA[zzj111000]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Thu, 30 Jun 2011 00:44:16 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[RS232最大传输距离50米，RS-422/RS-485最大传输距离1200米。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1081904.html]]></link>
 <author><![CDATA[liupengshuai]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 29 Jun 2011 23:39:03 +0000]]></pubdate>
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 <description><![CDATA[我25米的通讯线也能正常使用呀 [s:28]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1081746.html]]></link>
 <author><![CDATA[aaweihua]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 29 Jun 2011 12:42:41 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[接口RS232 15米,RS485、RS422理论上1200米，实际应用不要超过500米，以太网接口用双绞网线100米内。既然是1个PLC连2个人机应该是后两个。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1081731.html]]></link>
 <author><![CDATA[bogegongkong]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 29 Jun 2011 12:14:53 +0000]]></pubdate>
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 <description><![CDATA[顶上去啊&nbsp;&nbsp;着急啊&nbsp;&nbsp; 现在要两个屏控制一个PLC]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-112341#1081723.html]]></link>
 <author><![CDATA[zwz579]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 29 Jun 2011 11:49:51 +0000]]></pubdate>
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