论文部分内容阅读
多年来,可变控制器(以下简称PLC)是基于微处理器的通用工业控制装置,能执行各种形式和各种级别的复杂控制任务,它的应用面广,功能强大,使用方便。是现在工业自动化的主要支柱之一。外部干扰与系统结构无关,是随机的,且干扰源是无法消除的,只能针对具体情况加以限制;内部干扰与系统结构有关,主要通过内交流主电路,模拟量输入信号等引起,可合理设计系统线路来消弱和抑制内部干扰和防止外部干扰。
Over the years, Variable Controllers (PLCs) are microprocessor-based general purpose industrial control devices that perform complex control tasks in various forms and at various levels. They are versatile, powerful and easy to use. Is now one of the main pillars of industrial automation. External interference has nothing to do with the system structure, is random, and the interference source can not be eliminated, and can only be limited according to the specific situation. The internal interference is related to the system structure and is mainly caused by the internal AC main circuit and the analog input signal, Design system lines to attenuate and suppress internal interference and prevent external interference.