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foxplc
水到渠成
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樓主  發(fā)表于: 2008-08-20 11:24
變頻器的啟動(dòng)是通過(guò)上位機界面的啟動(dòng)按鈕實(shí)現的.啟動(dòng)按鈕點(diǎn)擊后,控制變頻電機的風(fēng)扇的接觸器吸合,其一對常開(kāi)點(diǎn)接入

變頻器二次端子的正轉端子,變頻器設為外部端子啟動(dòng).為什么點(diǎn)擊啟動(dòng)后,PLC和上位機通訊中斷?以前可正常啟動(dòng),通訊也

正常.
張平全
為國出力的時(shí)候到了
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1樓  發(fā)表于: 2008-08-23 13:20
特別要強調的是"屏蔽做得到位,接地也一定要到位,兩都缺一不可,接地更重要"

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