330709-000-050-10-02-00 差胀传感器

（1）CPU 

CPU是PLC的控制中枢，PLC在CPU的控制下有条不紊地协调工作，从而实现对现场的各个设备进行控制。CPU由微处理器和控制器组成，它可以实现逻辑运算和数学运算，协调控制系统内部各部分的工作。

控制器的作用是控制整个微处理器的各个部件有条不紊的进行工作，它的基本功能就是从内存中读取指令和执行指令。

（2）存储器

PLC配有两种存储器，即系统存储器和用户存储器。系统存储器用来存放系统管理程序，用户不能访问和修改这部分存储器的内容。

用户存储器用来存放编制的应用程序和工作数据状态。存放工作数据状态的用户存储器部分也称为数据存储区，它包括输入/输出数据映像区、定时器/计数器预置数和当前值的数据区及存放中间结果的缓冲区。

330709-000-050-10-02-00 差胀传感器

(1) CPU

The CPU is the control center of the PLC, and the PLC works methodically under the control of the CPU, so as to achieve the control of each device on the site. The CPU is composed of a microprocessor and a controller, which can realize logical and mathematical operations and coordinate the work of various parts of the control system.

The role of the controller is to control the entire microprocessor each part of the orderly work, its basic function is to read instructions from the memory and execute instructions.

(2) Memory

PLC is equipped with two kinds of memory, namely system memory and user memory. The system memory is used to store the system management program, and users cannot access and modify the contents of this part of the memory.

User memory is used to store the state of the programmed application and working data. The part of the user memory that stores the state of the working data is also called the data store, which includes the input/output data image area, the data area of the timer/counter preset number and the current value, and the buffer to store the intermediate results.