Under what conditions will the presence of the input signal maximize the I/O response time?This is the maximum I/O response time of the PLC.Assuming that the input signal appeared in the previous I/O scan stage,when the CPU reads the signal,it has appeared,but it has not reached the stable stage,so it cannot be read in.In this way,the input information can only be read in the I/O scan phase of this scan cycle.Therefore,the maximum I/O response time is approximately two scan cycles,one output delay time,and approximately one I/O scan phase time.
输入信号的出现在哪种情况下将使I/O响应时间最大呢?这就是PLC的最大I/O响应时间问题。假设输入信号的出现是在前一个I/O扫描阶段,CPU读取该信号时,它已出现,但尚未达到稳定阶段,因而未能读入。这样,这个输入信息就要在本扫描周期的I/O扫描阶段才能读入。因此,I/O响应时间的最大值大约是两个扫描周期、一个输出延迟时间和大约一个I/O扫描阶段的时间。
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