5X00497G01

5X00497G01

5X00497G01

5X00497G01

3.CPU模块中的存储器

存储器分为系统程序存储器和用户程序存储器，系统程序相当于个人计算机中的操作系统，它使PLC具有基本的智能，能完成PLC设计者的规定的各种工作。系统程序由PLC的生厂家设计并固定化在ROM（只读存储器）中，用户不能读取。用户程序由用户设计，它使PLC能完成用户要球的特定功能，用户程序存储器的容量以字节（B）为单位。

（1）.随机存取存储器（RAM）

用户可以用编程装置读出RAM中的内容，也可以将用户程序写入RAM，因此RAM又叫读/写存储器。RAM的工作速度高、价格便宜、改写方便。

（2）.只读存储器（ROM）

ROM的内容只能读出，不能写入。

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