IC697BEM731
IC697BEM731
IC697BEM731
在内部处理阶段，PLC检查CPU．模块内部的硬件是否正常，将监控定时器复位，以及完成一些其它内部工作。
在通信服务阶段，PLC与其它的带微处理器的智能装置通信，响应编程器键入的命令，更新编程器的显示内容。
当PLC处于停止(STOP)模式时，只执行以上的操作。PLC处于运行(RUN)模式时，还要完成另外三个阶段的操作。
在PLC的存储器中，设置了一片区域用来存放输入信号和输出信号的状态，它们分别称为输入映像寄存器和输出映像寄存器。PLC梯形图中的其他编程元件也有对应的映像存储区，它们统称为元件映像寄存器。
在输入处理阶段，PLC把所有外部输入电路的接通，断开状态读入输入映像寄存器。 外部输入电路接通时，对应的输入映像寄存器为l状态，梯形图中对应的输入继电器的常开触点接通，常闭触点断开。外部输入触点电路断开时，对应的输入映像寄存器为0状态，梯形图中对应的输入继电器的常开触点断开，常闭触点接通。
备货，备货，降降降，火火火，火火火……
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