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樓主  發(fā)表于: 2010-04-21 16:41
臺達PLC用MODBUS控制變頻器，使用RTU模式，要求寫(xiě)頻率跟讀頻率�，F在能寫(xiě)，但是讀的時(shí)候不穩定。讀出來(lái)的數據存在D1073\D1074。寫(xiě)頻率的時(shí)候D1073=2？
讀的時(shí)候數據正常。請教什么問(wèn)題？
yuehuasheji
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1樓  發(fā)表于: 2010-04-21 17:52
讀頻率完成是保存到相關(guān)寄存器，但不能對該寄存器寫(xiě)數據，應該是些到變頻器的相應地址

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