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caibihui163
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樓主  發(fā)表于: 2013-10-16 10:32
請教各位朋友,我用信捷與三菱E700進(jìn)行MODBUS通信,用指令REGW可以進(jìn)行變頻器參數寫(xiě)入和控制,但沒(méi)辦法用REGR指令讀取參數,參數存取寄存器一直都是0,不知什么原因,而用T-COMM軟件監測變頻器回復的參數不為0!請問(wèn)各位高手這是什么問(wèn)題?
[ 此帖被caibihui163在2013-10-16 11:05重新編輯 ]
xuyifu
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1樓  發(fā)表于: 2013-10-17 08:51
引用
引用樓主caibihui163于2013-10-16 10:32發(fā)表的 信捷PLC與三菱E700進(jìn)行MODBUS通信不能讀變頻器參數 :
請教各位朋友,我用信捷與三菱E700進(jìn)行MODBUS通信,用指令REGW可以進(jìn)行變頻器參數寫(xiě)入和控制,但沒(méi)辦法用REGR指令讀取參數,參數存取寄存器一直都是0,不知什么原因,而用T-COMM軟件監測變頻器回復的參數不為0!請問(wèn)各位高手這是什么問(wèn)題?


你能用PLC與變頻器通訊控制,參數能寫(xiě)入,并且能按照你的要求運行的話(huà),說(shuō)明你已經(jīng)會(huì )用MODBUS,但從你的問(wèn)題來(lái)看,只是讀取的時(shí)候本來(lái)不為零的參數為零,用其他的軟件讀同一參數又不為零,很可能是MODBUS的對應地址不對,或者(比如頻率吧,寫(xiě)入和監控的地址是不一樣的)我沒(méi)用過(guò)信捷的PLC,不管是什么PLC這個(gè)通訊的思路還是一樣的。再不行QQ加入群314713368

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