The International Electrotechnical Commission(IEC)defined PLC as follows in the third draft of the PLC standard draft in 1985:”Programmable logic controller is an electronic system for digital operation,specially designed for application in an industrial environment.。It uses programmable memory to store instructions for performing logical operations,sequence control,timing,counting and arithmetic operations in it,and controls various types of digital and analog inputs and outputs.Machinery or production process.Programmable controllers and their related equipment should be designed according to the principle that the industrial control system can be easily formed as a whole and its functions can be easily expanded.”From the above definition,it can be seen that PLC is a program to In addition to completing various control functions,the industrial control computer that changes the control function also has the function of communicating and networking with other computers.
国际电工委员会(IEC)在1985年的PLC标准草案第3稿中,对PLC作了如下定义:“可编程序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、模拟式的输入和输出,控制各种类型的机械或生产过程。可编程序控制器及其有关设备,都应按易于使工业控制系统形成一个整体,易于扩充其功能的原则设计。”从上述定义可以看出,PLC是一种用程序来改变控制功能的工业控制计算机,除了能完成各种各样的控制功能外,还有与其他计算机通信联网的功能。
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