In a SciLab project wherein they build a PID controller they include a CLR/continuous transfer function between the output of the PID and the multiplexer, which was used to combine the step and the PID output for the graph. I was curious as to what the transfer function was supposed to do and what purpose it served in the project?
What is the purpose of the transfer function in PID?
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0@Manos Well, the continuous transfer function in SciLab is in the format of (4)/(s^2 + s), where 4 is the numerator of a fraction, and s^2 + s was the denominator. That's what they created in the video. I know if you don't have the function it gives an error stating "algebraic loop"... – 2011-12-22
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The project simulates a PID controller for a specific process, namely the process whose transfer function is $\frac{4}{s^2 + s}$.
The PID controller block, which defines the controller, has a description that should help you understand the overall setup of the simulation, including the role of the CLR block.
The CLR block (see description) defines the process being controlled, by specifying its transfer function.