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問:CPU414-2DP 正常工作情況下,插入存儲卡,導(dǎo)致CPU停機,并且程序無法重新上傳,CPU外部故障燈閃爍和CP443-1內(nèi)部故障燈閃爍,急求可能故障原因及解決辦法
問題補充:使用的存儲卡是6ES7952-1KK00-0AA0,據(jù)了解,僅僅是FEPROM卡啊,擴(kuò)容用的,也會產(chǎn)生跟MCC卡一樣的問題嗎?
現(xiàn)場已經(jīng)經(jīng)過如下步驟處理:(1)PLC斷電,再上電,原備份程序仍然無法完成上傳;(2)PLC斷電,將存儲卡取出,再上電,原備份程序仍然無法完成上傳。因本人不在現(xiàn)場,據(jù)了解是程序上傳后,CPU外部故障燈和CP443內(nèi)部故障燈閃爍。本人也估計是否是非等同程序未清除?不過如何鑒定存儲卡是否損壞呢?
答:首先將存儲卡帶電插入正常的CPU是比較危險的做法,不僅可能損壞存儲卡,可能運行程序的不確定性;
對S7-400PLC來說,它是使用閃存卡FEPROM作為外置裝載存儲器的;如果PLC運行的情況下插拔存儲卡,則CPU會通過指示燈(以0.5Hz 頻率閃爍)來指示存儲器復(fù)位請求;而如果你在PLC關(guān)閉的情況下插拔存儲卡,CPU會在接通電源后自動執(zhí)行存儲器的復(fù)位;
如果CPU外部故障燈閃爍和CP443-1內(nèi)部故障燈閃爍,很清楚存儲卡里的用戶程序和系統(tǒng)參數(shù)已經(jīng)被復(fù)制到CPU存儲器主存儲器RAM區(qū)中,而原來工作存儲器、系統(tǒng)存儲器和內(nèi)置存儲器里的內(nèi)容已經(jīng)被復(fù)制為新的程序;可能新的程序、硬件配置與原來的不同,引起外部故障(EXTF燈閃爍);
如果你的存儲卡里是空的,那么實際PLC內(nèi)部已沒有程序;如果你手頭有原來保存的程序可以有兩種方法下載到CPU:首先執(zhí)行PLC復(fù)位(將CPU模式選擇開關(guān)打到MRES位置然后再切回到STOP,執(zhí)行存儲器復(fù)位,結(jié)果STOP上LED燈以3Hz的頻率至少閃爍3秒鐘(正在執(zhí)行存儲器復(fù)位),然后一直亮起復(fù)位完成;如果插入存儲卡,把CPU扳到STOP,然后打開源程序執(zhí)行PLC/Download user program to memory card(把用戶程序下載到存儲卡中),然后斷電再通電,F(xiàn)EPROM里的內(nèi)容被重新復(fù)制到CPU存儲器的RAM區(qū)中;對S7-400來說,也可以不用存儲卡,取出它,然后執(zhí)行PLC/RAM to ROM(直接下載到CPU里的RAM區(qū)),然后把CPU模式扳到RUN,但此方法如果CPU斷電而電池沒電程序?qū)G失,這是要注意的,臨時要;用此方法也可判斷存儲卡的好壞;
一般在做任何修改程序等此類操作,首先要把程序上載到PC中保存起來,然后才能進(jìn)行其他操作,這樣可以恢復(fù)
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