如果出现电池电量过低指示，电池电量过低故障会记录在CPU故障表内系统上电的下-阶段是CPU存储器确认。首先，系统确认电池电量正常并且以电池为后备电源的RAM区域仍然正常。校验电池做后备电源的存储应用程序的RAM，以确定数据是否已保存。接着，如果有梯形图程序，要检查_ MAIN块。如果没有梯形图，检查最小的独立C程序。
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