可以在初始化时存储在PROM中并且在PLC上电时自动的写回RAM中.另外–个需要考虑的是如果要改变程序(或者硬件配置)必须有人记住并将这些改变信息写入到PROM设备中，如果这一步骤被忘记，那么改变仅存储于RAM中，并且在没有存储器备用电池的系统中断电后这些改变也将丢失

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