Hi Liu,
I am having the same problem now, what did you do to solve the problem?
Which problem do you have?
Don't you know how ElapsedTime works?
Don't you understand the explanations in the LabVIEW help?
Did you use the auto reset or reset?
What is your use case?
With autoreset ElapsedTime automatically restarts the "time counting" when the desired time has elapsed.
With reset input you can decide when to restart…
Best regards,
GerdW

using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019