描述
通用辅助继电器M0～M499（500点）通用辅助继电器元件是按十进制进行编号的，FX2N系列PLC有500点，其编号为M0～M499。
断电保持辅助继电器M500～M1023（524点）PLC在运行中发生停电，输出继电器和通用辅助继电器全部成断开状态。再运行时，除去PLC运行时就接通的以外，其它都断开。但是，根据不同控制对象要求，有些控制对象需要保持停电前的状态，并能在再运行时再现停电前的状态情形。断电保持辅助继电器完成此功能，停电保持由PLC内装的后备电池支持。
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