描述
可编程控制器的存储器由只读存储器ROM、随机存储器RAM和可电擦写的存储器EEPROM三大部分构成，主要用于存放系统程序、用户程序及工作数据。只读存储器ROM用以存放系统程序，可编程控制器在生产过程中将系统程序固化在ROM中，用户是不可改变的。用户程序和中间运算数据存放的随机存储器RAM中，RAM存储器是一种高密度、低功耗
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