外文翻译-----可编程控制器的介绍.doc

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外文翻译-----可编程控制器的介绍,the introduce of plcone、plc overviewprogrammable controller is the first in the late 1960s in the united states, then called plc programmable logic controller (...
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内容介绍

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THE INTRODUCE OF PLC
ONE、PLC overview
Programmable controller is the first in the late 1960s in the United States, then called PLC programmable logic controller (Programmable Logic Controller) is used to replace relays. For the implementation of the logical judgment, timing, sequence number, and other control functions. The concept is presented PLC General Motors Corporation. PLC and the basic design is the computer functional improvements, flexible, generic and other advantages and relay control system simple and easy to operate, such as the advantages of cheap prices combined controller hardware is standard and overall. According to the practical application of target software in order to control the content of the user procedures memory controller, the controller and connecting the accused convenient target.
可编程控制器的介绍

一、PLC概述
可编程控制器是60年代末在美国首先出现的,当时叫可编程逻辑控制器PLC(Programmable Logic Controller),目的是用来取代继电器。以执行逻辑判断、计时、计数等顺序控制功能。提出PLC概念的是美国通用汽车公司。PLC的基本设计思想是把计算机功能完善、灵活、通用等优点和继电器控制系统的简单易懂、操作方便、价格便宜等优点结合起来,控制器的硬件是标准的、通用的。根据实际应用对象,将控制内容编成软件写入控制器的用户程序存储器内,使控制器和被控对象连接方便。
70年代中期以后,PLC已广泛地使用微处理器作为中央处理器,输入输出模块和外围电路也都采用了中、大规模甚至超大规模的集成电路,这时的PLC已不再是仅有逻辑(Logic)判断功能,还同时具有数据处理、PID调节和数据通信功能。国际电工委员会(IEC)颁布的可编程控制器标准草案中对可编程控制器作了如下的定义:可编程控制器是一种数字运算操作的电子系统,专为在工业环境下应用而设计。它采用了可编程序的存储器,用来在其内部存储执行逻辑运算,顺序控制、定时、计数和算术运算等操作的指令,并通过数字式和模拟式的输入和输出,控制各种类型的机械或生产过程。可编程控制器及其有关外围设备,易于与工业控制系统联成一个整体,易于扩充其功能的设计。

In the mid-1970s, the PLC has been widely used as a central processing unit