The response time of the PLC concept, response time difference under different output

What is the response time of the PLC controller? In the output using circulation refresh and direct way to refresh, what's the difference between the response time? From PLC controller receives an input signal to the PLC controller output to output a control signal, the time needed for the response time is PLC, using a loop to refresh, before the start of the refresh of a scan cycle instantly receive a signal, the signal in the current work, the response time the shortest, equal to the input delay time, a scan cycle time, output delay time together; If in a scan cycle of the I/O update stage just after receiving a signal, then the signal can't work this week period, must wait until the next scan cycle to work, the longest response time at this moment, it is equal to the input delay time, the two scan cycle time and output delay time together; When using direct output refresh, the longest response time is equal to the input delay time, a scan cycle time, output delay time together.
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