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5921338
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樓主  發(fā)表于: 2018-06-11 12:23
今天一臺設備因為動(dòng)作流程更改所以重新編寫(xiě)了程序,在寫(xiě)入時(shí)提示COM不能用,我用的是USB連接。關(guān)掉軟件重新打開(kāi)讀取plc成功,在線(xiàn)修改清除存儲器都可以,就是不能寫(xiě)入新程序。最后換SC09線(xiàn)寫(xiě)入的。是我哪里沒(méi)有設置對嗎,之前試的時(shí)候USB都可以寫(xiě)入的。
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zhongliang
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1樓  發(fā)表于: 2018-06-15 10:48
是USB-BD擴展口嗎,如果原來(lái)PLC里面有通訊程序,或者有設置通訊參數,那么插USB-BD的這個(gè)通道口(通道1)就會(huì )被占用,自然無(wú)法識別這個(gè)COM口,這時(shí)就只能通過(guò)PLC本體的圓口來(lái)下載程序,或者清除儲存器,清除儲存器以后,USB-BD口就可以正常使用了,但是請記住不要再將此通道口占用,本人親自測試過(guò)
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