描述
用户程序一般存于CMOS静态RAM中，用锂电池作为后备电源，以保证掉电时不会丢失信息。为了防止干扰对RAM中程序的破坏，当用户程序经过运行正常，不需要改变，可将其固化在只读存储器EPROM中。现在有许多PLC直接采用EEPROM作为用户存储器。
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