MVME162-213 MOTOROLA 嵌入式控制器

MVME162-213 MOTOROLA 嵌入式控制器

PLC系统中有几个存储元件：

1系统只读存储器（ROM），用于永 久存储操作系统和CPU使用的固定数据。

2用于用户程序的随机存取存储器（RAM）。

3用于数据的随机存取存储器（RAM）。

这是存储有关输入和输出设备的状态以及计时器、计数器和其他内部设备的值的信息的地方。数据RAM有时被称为数据表或寄存器表。该存储器的一部分，即地址块，将被留出用于输入和输出地址以及这些输入和输出的状态。一部分将用于预设数据，另一部分用于存储计数器值、定时器值等。 

MVME162-213 MOTOROLA 嵌入式控制器

There are several storage elements in the PLC system:

1 System read-only memory (ROM), which is used to permanently store fixed data used by the operating system and CPU.

2 Random access memory (RAM) for user programs.

3 Random access memory (RAM) for data.

This is where information is stored about the status of input and output devices and the values of timers, counters, and other internal devices. Data RAM is sometimes referred to as a data table or register table. A portion of this memory, the address block, will be set aside for input and output addresses and the state of those inputs and outputs. One part will be used for preset data, and the other part will be used to store counter values, timer values, and so on.