1746-OB8

1746-OB8

①.可编程逻辑控制器实质是一种于工业控制的计算机，  可编程逻辑控制器其硬件结构基本上与微型计算机相同，基本构成：电源、*处理单元（CPU） 、存储器、输入输出接口电路、功能模块、通信模块。

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②.当可编程逻辑控制器投入运行后，其工作过程一般分为三个阶段，即输入采样、用户程序执行和输出刷新三个阶段。完成上述三个阶段称作一个扫描周期。在整个运行期间，可编程逻辑控制器的CPU以一定的扫描速度重复执行上述三个阶段。

③.可编程逻辑控制器具有以下鲜明的特点。使用方便，编程简单，功能强，性能价格比高，硬件配套齐全，用户使用方便，适应性强，可靠性高，抗*力强，系统的设计、安装、调试工作量少，维修工作量小，维修方便

④.可编程逻辑控制器起源：1968年美国通用汽车公司提出取代继电器控制装置的要求；
1969 年，美国数字设备公司研制出了*台可编程逻辑控制器PDP—14 ，在美国通用汽车公司的生产线上试用成功，*采用程序化的手段应用于电气控制，这是*代可编程逻辑控制器，称Programmable Logic Controller，简称PLC，是*的*台PLC。
1969年，美国研制出世界*台PDP-14；
1971年，日本研制出*台DCS-8；
1973年，德国西门子公司（SIEMENS）研制出欧洲*台PLC，型号为SIMATIC S4；
1974年，中国研制出*台PLC，1977年开始工业应用。

⑤.可编程逻辑控制器主要应用领域：
1、《DCS集散控制系统》
2、《FCS控制系统》
3、《PLC可编程控制系统》
4、《HMI人机界面监控系统》
5、《各类风机水泵变频控制系统》
6、《无线遥测、遥控控制系统》TDK TAS-MAIN Rev 4.30A
 
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