control implementation in labview

[Sachindian]

Dear Sir,

I am a novice in Labview. I wish to implement a feedback controller on labview. I dont have a Control Design and simulation module. Can i implement the controller with this module.

The characteristic of controller is  like a first order low pass filter.

Could you direct me some examples where control implementation is done on pure labview.

Regards

Sachin

[Sachindian]

Sorry,

I want to implement the controller without the controller module. I just have labview. I dont want to use the PID and Fuzzy logic blocks.  Its a first order controller. b/(s+a).

Regards

Sachin

[moderator1983]

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Sachindian wrote:

I want to implement the controller without the controller module. I just have labview. I dont want to use the PID and Fuzzy logic blocks.  Its a first order controller. b/(s+a).

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Why don't you install and try out NI LabVIEW Control Design and Simulation Module, there is an option to create model based on the transfer function. And you can also simulate your designed model.

[Sachindian]

Dear Sir,

I am a Phd student. I dont have funds to to get the control system module for myself. Even if i try using it i will need it for further experiments in time to come which is not feasible with trial version. I need to do it on labview. 

Regards

Sachin

[moderator1983]

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@Sachindian wrote:

I am a Phd student. I dont have funds to to get the control system module for myself. Even if i try using it i will need it for further experiments in time to come which is not feasible with trial version. I need to do it on labview.

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Dear Sachin,

There is nothing that you cannot do with LabVIEW (just to boost your moral ).... Now if you choose not to use any module/toolkit, you need to develop a model using primitive and other library functions available within LabVIEW... And you already know that... Now what I don't know is, what exactly is the issue.

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@Sachindian wrote:

Its a first order controller. b/(s+a).

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Just convert it in TIME DOMAIN and code for that equivalent model.

For you example, I've attached an example, which is equivalent of 'Only P' controller (in context to PID controller).

[Sachindian]

Dear Sir,

Actually that helps.

Thanks a lot i can visualise my system now.

Regards

Sachin

[Sachindian]

Sir,

Another small question. How to implement integral action, to get the states. for eg y(dot) from y.

Ydot---->|integrator|----> y

Can we use the Arithmatic integration function for it.

[Ranjeet_Singh]

go to mathematics --> integration & differentiation..

[Sachindian]

Dear Sir,

I have tried to implement the controller i am not able to get any output from the controller. Could you please have a look at the code and point out where am I going wrong.

thanks

Sachin

[Andy-C]

Hello sachin,

Are you simply not seeing any response from your hardware, no output on your front panel, or are you actually seeing an error message when the VI runs?

Cheers,

Andy C.

Applications Engineering

National Instruments