51304362-350

   存储器主要有两种：一种是可读/写操作的随机存储器RAM，另一种是只读存储器ROM、PROM、EPROM 和EEPROM。在PLC中，存储器主要用于存放系统程序、用户程序及工作数据。

    系统程序是由PLC 的制造厂家编写的，和PLC的硬件组成有关，完成系统诊断、命令解释、功能子程序调用管理、逻辑运算、通信及各种参数设定等功能，提供PLC运行的平台。系统程序关系到PLC的性能，而且在PLC使用过程中不会变动，所以是由制造厂家直接固化在只读存储器ROM、PROM或EPROM中，用户不能访问和修改。

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