TRICONEX 3000110-380库存现货

公司名称：厦门仲鑫达自动化设备有限公司

联系人：张玉（先生）

联系电话：05925856210

联系手机：18030132583

工作QQ ：2516501928

电子邮箱：2516501928@qq.com

公司网址：http://www.zxdadsqc.com

传真：0592-5165561（请备注“张玉”收）以便我及时联系您！

地 址：厦 门 市 思 明 区 湖 光 大 厦 18 楼 A 单 元

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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，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。 PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。

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