GE IC200CHS022

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 PLC由哪几个主要部分组成？各部分的作用是什么？
       PLC由中央处理器CPU、存储器、输入输出接口和编程器组成。
      中央处理器CPU是核心，它的作用是接收输入的程序并存储程序。扫描现场的输入状态，执行用户程序，并自诊断，
      存储器用来存放程序和数据；
     输入接口采集现场各种开关接点的信号状态，并将其转化成标准的逻辑电平。

      输出接口用于输出电信号来控制对象；
      编程器用于用户程序的编制、编辑、调试、检查和监视，还可以显示PLC的各种状态。

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