品牌:GE/通用电气
起订:1件
供应:100件
发货:3天内
信息标签:IC200MDD844,供应,电子、电工,工控系统及装备
IC200MDD844———信用==财富—————偏门的备品备件联系我们
重合同、守信用,基础力量雄厚,备货充足!
公司有强大的营销网络,能为用户提供国外各种系列品牌的PLC.DCS备品备件,
还能为用户寻找偏冷门及停产的品种。
薄利多销,竭诚为广大用户提供全方位的服务。公司全体员工迎欢您的垂询!
我们**站在客户的角度上不断开拓、创新。真诚的期待与您的合作!
IC200MDD844在自动化控制领域,PLC是一种重要的控制设备。目前,**上有200多厂家生产300多品种PLC产品,应用在汽车(23%)、粮食加工(16.4%)、化学/制药(14.6%)、金属/矿山(11.5%)、纸浆/造纸(11.3%)等行业。为了使各位初学者更方便地了解PLC,本文对PLC的发展、基本结构、配置、应用等基本知识作一简介,以期对各位网友有所帮助。
一、PLC的发展历程
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**代可编程序控制器,称Programmable Controller(PC)。
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IC200MDD844★ 地址:厦门思明区湖滨东路湖光大厦18-A单元
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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。
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