why the gain P in PID block when I, and D are 0 and a gain block alone are not equivalent?

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SimTec 2018-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/381496-why-the-gain-p-in-pid-block-when-i-and-d-are-0-and-a-gain-block-alone-are-not-equivalent

回答： SimTec 2018-2-8

hello, I want to tune a PI controller using the self-osciallation model, so I want to use a P controller first. I used a gain block to emulate the P controller and I can see the oscillations and it is fine but whenver I use the P-Controller and the value of I and D to 0, I find a different behavior of the output. so why is not the same behaviour?

best regards,

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Birdman 2018-2-8

Before this question, have you checked the latest answers of mine in the following questions of yours? If you did, why didn't you respond positive or negative?

https://www.mathworks.com/matlabcentral/answers/380885-what-do-the-variable-p-i-and-d-mean-in-pid-z-in-simulink?s_tid=prof_contriblnk

https://www.mathworks.com/matlabcentral/answers/380400-why-i-ma-getting-error-in-simulating-the-matlab-function?s_tid=prof_contriblnk

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Answer 1

SimTec 2018-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/381496-why-the-gain-p-in-pid-block-when-i-and-d-are-0-and-a-gain-block-alone-are-not-equivalent#answer_304127

Hello Birdman, Sorry I did not see your comment as for when I looked at the comment I still see mine as the last but you have added those 02 very explanative pictures and thanks so much for that because now I know what should I write in those boxes. so from what I understood if I use the parallel form of PID is must work.