Suppose that you know from an independent measurement that the transport delay in
your system is 1.5 seconds. In the Plant Parameters dialog box, enter 1.5 for τ.
Check Fix to fix the parameter value. When you check Fix for a parameter, neither
graphical nor automatic adjustments to the estimated plant model affect that
parameter value.- Automatically optimize the system parameters to match the measured response data.
Click Auto Estimate to update the estimated system parameters using the
current values as an initial guess.You can continue to iterate using any of these methods to adjust plant structure and
parameter values until the estimated system response adequately matches the measured
response.7 PID Controller Tuning