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多年来,可变控制器(以下简称PLC),从生产到现在,实现了接线逻辑到存储逻辑的飞跃,其功能从弱到强,实现了逻辑控制到数字控制的进步,其应用领域从小到大,实现了单体设备简单控制到胜任运动控制,过程控制及集散控制等任务的跨域。它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, the variable controller (hereinafter referred to as PLC), from production to now, has realized the wiring logic to the storage logic leap, its function from weak to strong, to achieve the logic control to digital control progress, its application fields from small Large, to achieve a single device to control the simple motion control, process control and distributed control tasks such as cross-domain. It is a microprocessor-based, general-purpose industrial control unit that performs complex control tasks in a variety of forms and at various levels. It is 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.