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首页>系统集成及工控>PLC>可编程控制器

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1756-CNB 1756-CNB A-B *

具体成交价以合同协议为准

2018-05-14上海
型号
该企业相似产品
1756-L55,1756-L61,1756-L62,1756-L63,KSD1-16,KSD1-48,KSD1-32,KSD1-08,KSD1-64
产品简介
1756-CNB 1756-CNB A-B *
限于当时的元器件条件及计算机发展水平,早期的PLC主要由分立元件和中小规模集成电路组成,可以完成简单的逻辑控制及定时、计数功能。20世纪70年代初出现了微处理器。人们很快将其引入可编程控制器,使PLC增加了运算、数据传送及处理等功能,完成了真正具有计算机特征的工业控制装置。
详细信息

1756-CNB 1756-CNB A-B *

1756-CNB 1756-CNB A-B *

4. PLC的国内外状况

    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,美国数字设备公司(DEC)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*代可编程序控制器,称Programmable ,是*的*台PLC.
    限于当时的元器件条件及计算机发展水平,早期的PLC主要由分立元件和中小规模集成电路组成,可以完成简单的逻辑控制及定时、计数功能。20世纪70年代初出现了微处理器。人们很快将其引入可编程控制器,使PLC增加了运算、数据传送及处理等功能,完成了真正具有计算机特征的工业控制装置。为了方便熟悉继电器、接触器系统的工程技术人员使用,可编程控制器采用和继电器电路图类似的梯形图作为主要编程语言,并将参加运算及处理的计算机存储元件都以继电器命名。此时的PLC为微机技术和继电器常规控制概念相结合的产物。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)。

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1336F-BRF75-AA-EN-HAS2
1336F-BRF100-AA-EN-HAS2
1336F-BRF150-AA-EN-HAS2
1336F-BRF200-AA-EN-HAS2
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1336F-B020-AA-EN-HAS2
1336F-B025-AA-EN-HAS2
1336F-B030-AA-EN-HAS2
1336F-B040-AA-EN-HAS2
1336F-B050-AA-EN-HAS2
1336F-B060-AA-EN-HAS2
1336F-B075-AA-EN-HAS2
1336F-B100-AA-EN-HAS2
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1336F-B150-AA-EN-HA2
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1336F-B250-AA-EN-HA2
1336F-BP250-AA-EN-HA2-CM
1336F-BP250-AA-EN-HA2-NCM
1336F-BP300-AA-EN-HA2-CM
1336F-BP300-AA-EN-HA2-NCM
1336F-BP350-AA-EN-HA2-CM
1336F-BP350-AA-EN-HA2-NCM
1336F-BP400-AA-EN-HA2-CM
1336F-BP400-AA-EN-HA2-NCM
1336F-BP450-AA-EN-HA2-CM
1336F-BP450-AA-EN-HA2-NCM
1336F-B500A-AA-EN-HA2
1336F-B600A-AA-EN-HA2

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Siemens Simatic 6ES7 952-0KH00-0AA0 6ES79520KH0AA0

 

 

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