描述
除了I/O映象区以外，系统RAM存储区还包括PLC内部各类软设备（逻辑线圈、数据寄存器、计时器、计数器、变址寄存器、累加器等）的存储区。该存储区又分为具有失电保持的存储区域和无失电保持的存储区域，前者在PLC断电时，由内部的锂电子供电。使这部分存储单元内的数据得以保留；后者当PLC停止运行时，将这部分存储单元内的数据全部置“零”。
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