How do I monitor parameters from a SubVI on the front panel of the main VI?

Good day. I have a LabView program that I am modifiying (actually it is a National Instruments demo program called Simple PID Demo). On the Front Panel of the main VI, I need to monitor several parameters that are on a SubVI. How do I do this?
Thank you very much for your time and help.
Michael

Hi Michael,
Global Variables should solve your problem.
Looks like you have to pass values from Sub VI that will execute continously inside a main vi.
Look at attached VI
Hope you can implement this type of logic in your program.
regards
Dev
Attachments:
Main_1.llb ‏53 KB

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Stream data from a subvi to the main vi - path refnum

hello everyone
sorry my english
http://forums.ni.com/t5/LabVIEW/stream-data-from-a-subvi-to-the-main-vi/m-p/2205150/highlight/true#M...
- refnum boolean worked
- refnum graph worked
- refnum numeric worked
how to create a path refnum? stream data from a subvi to the main vi
where do I start?
thank
Solved!
Go to Solution.

Bom Dia Saille,
Eu acredito que o que você tenha hoje seja isso aqui (Desenho bem simplificado):
Hoje o que você tem é o Aplicativo do Medidor + USB Driver controlando o seu medidor. Basicamente, sua aplciação está dividida em três camadas:
Aplicação - Onde estão as funcionalidades principais do programa (interface com o usuário, apresentação de dados, geração de arquivos, etc.)
VISA - Uma arquitetura de Software para controle de instrumentos. Basicamente, ele se comunica com o Driver USB para poder enviar e receber pacotes de dados através do barramento USB.
Device Driver - Intruções de SW de baixo nível para controlar um periférico através de um barramento.
No desenho, eu aponto duas camadas onde você pode tentar atuar para automatizar suas medições:
Aplicação - Você pode usar o VI Server para controlar o Aplicativo do Medidor (Se este aplicativo tiver sido desenvolvido em LabVIEW, o que eu suponho ser verdade). No entanto é necessário saber se o desenvolvedor do produto permitiu isso (Veja Using VI Server to Pass Data Between a VI and a LabVIEW Executable). Outra alternativa é conversar com o fabricante para ver se ele desenvolveu alguma API (Application Programming Interface) para que você consiga controlar o instrumento diretamente.
VISA - O LabVIEW Fornece uma API chamada NI-VISA para poder enviar e receber informações através de diversos barramentos (Veja Serial Instrument Control Tutorial)
É possível acessar o Driver diretamente também, mas eu não recomendo. O resultado não compensa o esfroço!
Espero ter esclarecido suas dúvidas e espero que você tenha sucesso na sua aplicação!!
Atenciosamente.
Felipe Flores
Engenharia de Aplicações
National Instruments Brasil

Stream data from a subvi to the main vi

Hi
I’m wondering if someone can help me. I’m trying to stream data from a sub vi to the main vi without opening and closing the sub vi continuously. The data also needs to be extracted from a while loop within the sub vi. background info: The sub vi controls a photomultipler tube, which once it is on it is best kept on. The PMT signal is generated in while loop of the sub vi. Attached are some basic vis showing what I’m trying to do.
Thanks
Attachments:
Main page.vi ‏11 KB
test2.vi ‏13 KB

If you are streaming measurements continously I would consider using a circular buffer instead of the queued producer/consumer approach.
Check out this implementataion of such a buffer, use only this if your DAQ device does not have an internal circular buffer.
https://decibel.ni.com/content/docs/DOC-20403
Alternatively if you are using a DAQmx device, consider using the device buffer for sharing DAQ data between loops.
Br,
/Roger

Access data from a SubVi to the MainVi while the SubVi is still Running

I want to pass some Boolean/String from a subvi to the main vi while the subvi is still running.
I understand that it could be done using queue/ notifier. I do not want to use global variables. I looked at different examples but failed to figure out how to do it.
I was trying to make an example by looking at an example from Labview about notifier.
Can anyone please help me with this code and guide me to the correct way.
Thanks.
Attachments:
mainVi.vi ‏9 KB
SubVi.vi ‏11 KB

Hi babu726,
I have included a revised MainVi.vi and SubVi.vi for you. I had to modify the SubVi to get it to be called by the MainVi. I also included a disabled diagram structure with the code just copied and pasted in, since your code does not seem modular. Hopefully this helps!
Regards,
Michelle G
Applications Engineering
National Instruments
Attachments:
SubVi.vi ‏11 KB
mainVi.vi ‏16 KB

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How do I get values into a vi from a subvi while the subvi is still running within the vi?

Hello
This is my problem. I have a subvi that runs an experiment. At different point in the experiment different instruments are on or off and I have a boolean array display this info. It is updated at various points of the experiment via a local variable. That works fine. Here is the problem though. I run that subvi from a main vi program (that runs it several times for several experiment cycles). I would like to pass the status of that array onto the mainvi to display there too. The problem is that the array in the main vi is not updated until the subvi is done running and thus displays only the array status at end of experiment (instead of changing
as the status changes within the subvi). I tried using a global variable to write to it in the subvi every time there is an update, and read from it in the mainvi, but that doesn't work, it still displays just the status at the end of the subvi execution. Does anyone know how to make this work, or if there is a workaround this? Thanks.

If you have LabVIEW 6i, you can update indicators of a calling VI from
a SubVI, while the subVI is running.
In your case you need
1) an indicator on the main VI panel to display the boolean array
2) to pass a reference to that indicator to the subvi when you call it
3) to use this reference in the subVI, connect a property node to it and
write the values to be displayed to the 'value' property of this node
If you don't have version 6, you can write the values to be displayed to
a global and display this global in the main VI from within a while loop
which must run in the main VI in parallel to the running subVI.
It's more complicated, since you need a mechanism to gracefully shut
down the while loop after subVI finishes. You could do this with
another global control boolean which is not displayed but just connected
to the repeat terminal of the while loop. Don't forget to put a 'Wait' of,
say, 50...100 msec in that while loop.
-Franz
zkajan schrieb:
> Hello
> This is my problem. I have a subvi that runs an experiment. At
> different point in the experiment different instruments are on or off
> and I have a boolean array display this info. It is updated at
> various points of the experiment via a local variable. That works
> fine. Here is the problem though. I run that subvi from a main vi
> program (that runs it several times for several experiment cycles). I
> would like to pass the status of that array onto the mainvi to display
> there too. The problem is that the array in the main vi is not
> updated until the subvi is done running and thus displays only the
> array status at end of experiment (instead of changing as the status
> changes within the subvi). I tried using a global variable to write
> to it in the subvi every time there is an update, and read from it in
> the mainvi, but that doesn't work, it still displays just the status
> at the end of the subvi execution. Does anyone know how to make this
> work, or if there is a workaround this? Thanks.
Franz Josef Ahlers
Section Semiconductor Devices
Physikalisch-Technische Bundesanstalt
Bundesallee 100
D-38116 Braunschweig
phone: (+49) 531 592 2410
fax: (+49) 531 592 2405

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How do I monitor parameters from a SubVI on the front panel of the main VI?

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