PID

Hi everyone,

Can enyone tell me how an PID function Block works.....??

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Meer Arshad Ali Rank: 203

Asked 2 years ago

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as correctly said Kstoilov, in the help code of Codesys are given numerous information on pid function.

During the editing of your Codesys string, click on the block you want to use, with the right mouse button select "zoom" and you will have an overview of the library menu about the functions of the selected block

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by Meer Arshad Ali Rank: 203 on 9/22/2017 11:36:02 AM | Like (0) | Report

in need explanation on PID function block of in Codesys. There is not much explanation in help file,, i need how KP, TN, TV is Selected.
B'coz i dont know much about PID

by Flavio Mussolin AKS expert

Rank: 4 on 9/24/2017 7:52:57 AM | Like (0) | Report

The functions that you wrote are the standard function of PID, Proportional Integral and Derivative.

I suggest you to read one good book about the fundamentals of regulation with PID,then you will see that these concepts will be much clearer.

Here, as a response to a question, it is rather complicated to undertake a lesson on the principles of regulation with PID, so I suggest some good reading.

by Flavio Mussolin AKS expert

Rank: 4 on 9/24/2017 7:56:08 AM | Like (1) | Report

Anyway, the controller acquires input from a process and compares it with a reference value. The difference, the so-called error signal, is then used to determine the value of the output variable of the controller, which is the manipulable variable of the process.

The PID adjusts output based on:

the value of the error signal (proportional action);
past values of the error signal (integral action);
how fast the error signal varies (derivative action).

PID controllers are relatively easy to understand, install and calibrate, comparing with more complex control algorithms based on good control theory and robust control. Parameter calibration usually takes place through simple empirical rules, such as Ziegler-Nichols methods, which result in good performance stabilizing controllers for most processes. Very often the derivative action is removed, resulting in the most common PI controller.

by Meer Arshad Ali Rank: 203 on 9/24/2017 7:58:09 AM | Like (0) | Report

sure, Thanks

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Flavio Mussolin AKS expert

Rank: 4

Answered 2 years ago

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