DSSB-110

DSSB-110

DSSB-110

DSSB-110

DSSB-110

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……**停止地循环反复地进行着。
图1－1－1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

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