供应AB1771-OD厂家直销
供应AB1771-OD厂家直销
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在工业生产过程中,大量的开关量顺序控制,它按照逻辑条件进行顺序动作,并按照逻辑关系进行连锁保护动作的控制,及大量离散量的数据采集。传统上,这些功能是通过气动或电气控制系统来实现的。1968年美国GM(通用汽车)公司提出取代继电气控制装置的要求,第二年,美国数字公司研制出了基于集成电路和电子技术的控制装置,首次采用程序化的手段应用于电气控制,这就是第一代可编程序控制器,称Programmable Controller(PC)。
个人计算机(简称PC)发展起来后,为了方便,也为了反映可编程控制器的功能特点,可编程序控制器定名为Programmable Logic Controller(PLC),现在,仍常常将PLC简称PC。
PLC的定义有许多种。国际电工委员会(IEC)对PLC的定义是: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。它采用可编程序的存贮器,用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令,并通过数字的、模拟的输入和输出,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,都应按易于与工业控制系统形成一个整体,易于扩充其功能的原则设计。
上世纪80年代至90年代中期,是PLC发展最快的时期,年增长率一直保持为30~40%。在这时期,PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高,PLC逐渐进入过程控制领域,在某些应用上取代了在过程控制领域处于统治地位的DCS系统。
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