1794-OM8

1794-OM8

1794-OM8

1794-OM8

输入刷新--再运行用户程序--再输出刷新--再输入刷新--再运行用户程序--再输出刷新……永不停止地循环反复地进行着。 
图1.1所示的流程图反映的就是上述过程。它也反映了信息的时间关系。
有了上述过程，用PLC实现控制显然是可能的。因为：有了输入刷新，可把输入电路监控得到的输入信息存入PLC的输入映射区；经运行用户程序，输出映射区将得到变换后的信息；再经输出刷新，输出锁存器将反映输出映射区的状态，并通过输出电路产生相应的输出。又由于这个过程是永不停止地循环反复地进行着，所以，输出总是反映输入的变化的。只是响应的时间上，略有滞后。当然，这个滞后不宜太大，否则，所实现的控制不那么及时，也就失去控制的意义。
为此，PLC的工作速度要快。速度快、执行指令时间短，是PLC实现控制的基础。事实上，它的速度是很快的，执行一条指令，多的几微秒、几十微秒，少的才零点几，或零点零几微秒。而且这个速度还在不断提高中。
图1.1所示的过程是简化的过程，实际的PLC工作过程还要复杂些。除了I/O刷新及运行用户程序，还要做些公共处理工作。

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