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當PLC的用戶程序要保留在RAM中時，就會用到電池，電池通常是3V或3.6V的不可充電的鋰電池，電池的使用壽命通常是五年左右，電池用久了，電壓就會下降，當其下降到不足以保證RAM中數(shù)據(jù)時，RAM中的程序就會丟失。如果用戶沒有備份程序，就會相當麻煩。[1]一般PLC內(nèi)部設(shè)有電池電壓檢測電路，當電壓下降到一定程度時，PLC就會報警，提醒更換電池。PLC的使用說明書都有提供更換電池的方法。一般來 說，PLC在斷電后，因為PLC上RAM電源端接有充電電容，即使把電池去掉，電容上充電電量也足夠RAM內(nèi)的數(shù)據(jù)保持一段時間，所以如果取掉電池后在短 時間內(nèi)（通常5分鐘）再將新電池換上去，數(shù)據(jù)是不會丟失的。
但用戶實際使用PLC的環(huán)境情況不盡相同，例如電容的容量下降，RAM電源回路有 灰塵、油泥等形成放電回路等，這會加快PLC斷電后電容的放電速度，從而使時間不好把握。如果在帶電的情況下更換電池就可保程序*。因為電源始終會 有電壓加在RAM芯片的電源腳。當然更換時亦要小心應(yīng)對，注意電池的極性以及避免短路情況發(fā)生。
廈門潤星貿(mào)易有限公司
主營產(chǎn)品：DCS集散式控制系統(tǒng)、PLC可編程控制器、數(shù)控系統(tǒng)、（CPU處理器、模塊、卡件、控制器、伺服驅(qū)動、工作站、驅(qū)動器、馬達、 內(nèi)存卡、 電源，機器人備件等）各類工控產(chǎn)品Ge FANUC SERVO DRIVE BOARD A16B-1200-0230

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GE Fanuc A16B-3200-0040?/08D PC Main Board CPU PCB NEW

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1 NEW FANUC A16B-3200-0040 PC BOARD O4-2

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