1756-CP3 1756-CP3

发布时间:2017-09-19

1756-CP3

1756-CP3

1756-CP3

  (1).输入采样:输入采样,就是PLC以顺序扫描的方式读入所有输入端口的信号状态,并将此状态,读入到输入映象寄存器中。当然,在程序运行周期中这些信号状态是不会变化的,除非一个新的扫描周期的到来,并且原来端口信号状态已经改变,读到输入映象寄存器的信号状态才会发生变化。

   (2)、程序执行:程序执行阶段系统会对程序进行特定顺序的扫描,并且同时读入输入映像寄存区、输出映像寄存区的读取相关数据,在进行相关运算后,将运算结果存入输出映像寄存区供输出和下次运行使用。

    (3)、出刷新阶段:在所指令执行完成后,输出映像寄存区的所有输出继电器的状态(接通/断开)在输出刷新阶段转存到输出锁存器中,通过特定方式输出,驱动外部负载。

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