6FX1122-2AC02+-+6FX1122-2AC02

西門子S7-200系列plc如何設(shè)置掉電保持，現(xiàn)有兩個數(shù)據(jù)MW100,MW102需要保存如何設(shè)置。
答：把MW100,MW102更該為MB0~MB13里的數(shù)據(jù)就行了，這個值是固定值。在系統(tǒng)快里的數(shù)據(jù)保存里設(shè)置，設(shè)置好了然后下載到PLC就行了。不過這個是利用電容來保持的，大概也就是120個小時左右。
用超級電容供電的，保持時間是：190小時/典型值（40C°時最少120小時）
應(yīng)用S7-200時，可以選用以下幾種數(shù)據(jù)保持方法：

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公司  名稱：廈門泰尼電氣有限公司
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CPU的內(nèi)置超級電容，斷電時間不太長時，可以為數(shù)據(jù)和時鐘的保持提供電源緩沖 
CPU上可以附加電池卡，與內(nèi)置電容配合，長期為時鐘和數(shù)據(jù)保持提供電源 
設(shè)置系統(tǒng)塊，在CPU斷電時自動保存M區(qū)中的14個字節(jié)數(shù)據(jù) 
在數(shù)據(jù)塊中定義不需要更改的數(shù)據(jù)，下載到CPU內(nèi)可以永久保存 
用戶編程使用相應(yīng)的特殊寄存器功能，將數(shù)據(jù)寫入EEPROM永久保存 
CPU內(nèi)置的EEPROM存儲器用于永久保存數(shù)據(jù)，包括與RAM數(shù)據(jù)區(qū)一一對應(yīng)的全部的V存儲區(qū)、部分M存儲區(qū)（MB0 - MB13）、定時器（TONR）。

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