In the Plant Identification document, the Input plot shows the specified input signal,
and the Output plot shows the corresponding output response.To use this simulated input/output data, click Apply. Then, to close the Simulate I/O
Data tab, click Close.On the Plant Identification tab, select the plant structure to identify based on your
knowledge of the plant and the appearance of the output step response. For this example,
the output response looks like an underdamped second-order response. In the Structure
drop-down list, select Underdamped Pair.7 PID Controller Tuning