Discrete PID reg. sample time and Solver options

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Robin Beene 2013-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/75173-discrete-pid-reg-sample-time-and-solver-options

I want to ask whether the sample times (1 inside the discrete PID governor and the another inside the configuration parameters ->Solver options-> Fixed-Step size) must be the same. I would like to have Solver option sample time: 0.001 but my discrete PID has 0.1. Unfortunately when I run simulation I get an error message and to avoid error I need to decrease my PID sample time to 0.001 but I don't want that.

Is there any other way to solve this out?

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Arkadiy Turevskiy 2013-5-9

These 2 sampling times don't have to be the same. What is the error message you are getting?

Robin Beene 2013-5-9

I get error for proportional,derivation and integration gain "The sample time 0.1 of 'PELTON/Discrete PID Controller1/Derivative Gain' at input port 1 is different from the sample time [0, 0] of 'PELTON/Sum1' at output port 1. Consider inserting a Rate Transition block between the two ports. Alternatively, you can control the diagnostic action for unspecified rate transitions on the Sample Time Diagnostics pane of the Configuration Parameters dialog box."

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Answer 1

Arkadiy Turevskiy 2013-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/75173-discrete-pid-reg-sample-time-and-solver-options#answer_85254

Try inserting a rate transition block like the tool says.

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Robin Beene 2013-5-13

编辑：Robin Beene 2013-5-13

I did and it worked :P But I'm not sure does it make any difference to my results. Does the Rate transition block has any influence on my simulation results?

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