DSQC 249B/3HAA3563-AHA/1
DSQC 249B/3HAA3563-AHA/1
DSQC 249B/3HAA3563-AHA/1
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,可把输入电路监视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,输出是反映输入的变化。只是响应的时间上,略有滞后。但由于PLC的工作速度很快,所以,这个“略有滞后”的时间是很短的,一般也就是几毫秒、几十毫秒,多也不会过100到200毫秒。
图2a所示的是简化的过程,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,还要做些其它的公共处理工作。公共处理工作有:循环时间监视、外设服务及通讯处理等。
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