Hello Tan Chin Luh, thank you for your reaction. My problem is not in the discretization process itself. I have the difference equation of the PID controller. So I have attempted to develop the simulation and I have hit a problem which I have attempted to describe in another question (please see the link: http://mailinglists.scilab.org/Scilab-users-PID-controller-simulation-in-Scilab-Xcos-td4041014.html.). I have found that the problem mentioned in the link vanishes in case I use one clock source for whole simulation (the only one used clock source is the one which controls the S/H blocks). Do you have any idea why this behavior occurs? (I think that it could be caused by the aliasing phenomenon). Do you think that the simulation mentioned in the link (with one clock source) is correct?
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