AS-BDE0-216 AS-BDE0-216

发布时间:2017-09-18

AS-BDE0-216

AS-BDE0-216

AS-BDE0-216

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。

3.可以电檫出可编程的只读存储器(EEPROM

S7-200EEPROM来存储用户程序和长期保存的重要数据。

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