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358273433
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樓主  發(fā)表于: 2011-07-30 08:41
FX3U與三菱FR-740變頻器通過(guò)485-BD通信，接線(xiàn)和通信程序都是按說(shuō)明書(shū)樣例完成，但通信時(shí)SD燈不停閃爍，RD燈不亮，變頻器沒(méi)有任何反應。我看有網(wǎng)友說(shuō)要把參數551設為1�？晌覀冞@只變頻器551最小設置數為2，不能設為1。請大家指教一下，變頻器通信不成功有哪些原因？謝謝各位！
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1樓  發(fā)表于: 2011-07-31 19:00
上傳圖紙和你修改的參數目錄，幫你找找問(wèn)題，建議你先不要用485BD，先用一個(gè)助手測試一下變頻器的返回幀，看能否通訊上，能夠通訊上就好了，然后在搞程序，看它的返回幀的格式，在搞程序很明了的，一眼就看到那個(gè)字符在第幾個(gè)位置 呵呵呵僅供參考

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