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140CRP93200R

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品 牌: 施耐德 
型 号: 140CRP93200R 
规 格: 140CRP93200R 
单 价: 999.00元/个 
起 订: 1 个 
供货总量: 999 个
发货期限: 自买家付款之日起 3 天内发货
所在地: 福建 厦门市
有效期至: 长期有效
更新日期: 2015-01-23 11:05
浏览次数: 1
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【140CRP93200R】详细说明
 140CRP93200R
140CRP93200R
140CRP93200R
可编程序控制器PLC的发展概况及发展方向
 
 

一、国外PLC发展概况

PLC自问世以来,经过40多年的发展,在美、德、日等工业发达国家已成为重要的产业之一。世界总销售额不断上升、生产厂家不断涌现、品种不断翻新。产量产值大幅度上升而价格则不断下降。

目前,世界上有200多个厂家生产PLC,较有名的:美国:AB通用电气、莫迪康公司;日本:三菱、富士、欧姆龙、松下电工等;德国:西门子公司;法国:TE 施耐德公司;韩国:三星、LG公司等。

、技术发展动向

1. 产品规模向大、小两个方向发展

大:  I/O点数达14336点、32位为微处理器、多CPU并行工作、大容量存储器、扫描

      速度高速化。

小:  由整体结构向小型模块化结构发展,增加了配置的灵活性,降低了成本。

2. PLC在闭环过程控制中应用日益广泛

3. 不断加强通讯功能

4. 新器件和模块不断推出

高档的PLC除了主要采用CPU以提高处理速度外,还有带处理器的EPROMRAM的智能I/O模块、高速计数模块、远程I/O模块等专用化模块。

5. 编程工具丰富多样,功能不断提高,编程语言趋向标准化

有各种简单或复杂的编程器及编程软件,采用梯形图、功能图、语句表等编程语言,亦有高档的PLC指令系统。

6. 发展容错技术

采用热备用或并行工作、多数表决的工作方式。

7.追求软硬件的标准化。

、国内发展及应用概况

我国的PLC产品的研制和生产经历了三个阶段:顺序控制器(19731979)——一位处理器为主的工业控制器(19791985)——8位微处理器为主的可编程序控制器(1985以后)。在对外开放政策的推动下,国外PLC产品大量进入我国市场,一部分随成套设备进口。如宝钢一、二期工程就引进了500多套,还有咸阳显象管厂、秦皇岛煤码头、汽车厂等。现在,PLC在国内的各行各业也有了极大的应用,技术含量也越来越高。


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