汽轮机TSI系统 PR9350/02 缸胀传感器

产品详情资料

PLC的结构及各部分的作用
PLC的类型繁多，功能和指令系统也不尽相同,但结构与工作原理则大同小异，通常由主机、输入/输出接口、电源扩展器接口和外部设备接口等几个主要部分组成.PLC的硬件系统
1、主机
主机部分包括中央处理器（CPU）、系统程序存储器和用户程序及数据存储器。CPU是PLC的核心，它用以运行用户程序、监控输入/输出接口状态、作出逻辑判断和进行数据处理，即读取输入变量、完成用户指令规定的各种操作,将结果送到输出端,并响应外部设备（如电脑、打印机等）的请求以及进行各种内部判断等.PLC的内部存储器有两类，一类是系统程序存储器，主要存放系统管理和监控程序及对用户程序作编译处理的程序，系统程序已由厂家固定，用户不能更改；另一类是用户程序及数据存储器，主要存放用户编制的应用程序及各种暂存数据和中间结果。
2、输入/输出(I/O）接口
I/O接口是PLC与输入/输出设备连接的部件。输入接口接受输入设备(如按钮、传感器、触点、行程开关等）的控制信号。输出接口是将主机经处理后的结果通过功放电路去驱动输出设备（如接触器、电磁阀、指示灯等）。I/O接口一般采用光电耦合电路，以减少电磁干扰，从而提高了可靠性.I/O点数即输入/输出端子数是PLC的一项主要技术指标,通常小型机有几十个点，中型机有几百个点，大型机将超过千点。
3、电源
图中电源是指为CPU、存储器、I/O接口等内部电子电路工作所配置的直流开关稳压电源，通常也为输入设备提供直流电源。
4、编程
编程是PLC利用外部设备，用户用来输入、检查、修改、调试程序或监示PLC的工作情况。通过的PC/PPI电缆线将PLC与电脑联接，并利用的软件进行电脑编程和监控。
5、输入/输出扩展单元
I/O扩展接口用于将扩充外部输入/输出端子数的扩展单元与基本单元（即主机）连接在一起。
6、外部设备接口
此接口可将打印机、条码扫描仪，变频器等外部设备与主机相联，以完成相应的操作。
实验装置提供的主机型号有西门子S7—200系列的CPU224（AC/DC/RELAY）。输入点数为14，输出点数为10；CPU226（AC/DC/RELAY）,输入点数为26，输出点数为14。

英文产品详细信息

The structure of PLC and the functions of each part

There are various types of PLCs, and their functions and instruction systems are also different. However, their structure and working principles are similar, usually consisting of several main components such as the host, input/output interfaces, power extender interfaces, and external device interfaces. The hardware system of PLCs

1. Host

The host part includes the central processing unit (CPU), system program memory, and user program and data memory. The CPU is the core of PLC, which is used to run user programs, monitor the status of input/output interfaces, make logical judgments, and perform data processing. It reads input variables, completes various operations specified by user instructions, sends the results to the output end, responds to requests from external devices (such as computers, printers, etc.), and makes various internal judgments. There are two types of internal memory in PLC, one is system program memory, Mainly storing system management and monitoring programs, as well as programs for compiling and processing user programs. The system programs have been fixed by the manufacturer and cannot be changed by users; The other type is user programs and data storage, which mainly store user generated application programs, various temporary data, and intermediate results.

2. Input/Output (I/O) interface

The I/O interface is a component that connects the PLC to input/output devices. The input interface receives control signals from input devices such as buttons, sensors, contacts, travel switches, etc. The output interface is to drive output devices (such as contactors, solenoid valves, indicator lights, etc.) through the power amplifier circuit based on the processed results of the host. I/O interfaces generally use optoelectronic coupling circuits to reduce electromagnetic interference and improve reliability. The number of I/O points, or input/output terminals, is a major technical indicator of PLC. Typically, small machines have dozens of points, medium machines have hundreds of points, and large machines will exceed a thousand points.

3. Power supply

The power supply in the figure refers to a DC switch regulated power supply configured for the operation of internal electronic circuits such as CPU, memory, I/O interface, etc. It usually also provides DC power for input devices.

4. Programming

Programming is the use of external devices by PLC for users to input, check, modify, debug programs, or monitor the operation of the PLC. Connect the PLC to the computer through dedicated PC/PPI cables, and use dedicated software for computer programming and monitoring.

5. Input/output expansion unit

The I/O expansion interface is used to connect the expansion unit that expands the number of external input/output terminals with the basic unit (i.e. the host).

6. External device interface

This interface can connect external devices such as printers, barcode scanners, frequency converters, and the host to complete corresponding operations.

The host model provided for the experimental device is CPU224 (AC/DC/RELAY) of Siemens S7-200 series. The input points are 14 and the output points are 10; CPU226 (AC/DC/RELAY), with 26 input points and 14 output points.

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