Affichages multiples temps-réel d'un signal

Je dispose d'un vi d'acquisition d'un signal (+s voies et 2 cartes PCI-4472 et PCI-4474) qui me génère un tableau de waveforms en sortie (DAQmx).
Je veux écrire différents vis d'affichage (f(t), FFT, XY,...) de ce signal et qui devront être en temps réel. (sachant que d'autres affichages de post-traitements seront ensuite faits à partir d'un fichier de sauvegarde des données). Cette solution a été retenue car je ne vois pas comment faire de multi-fenêtrage sans ça... (mais on peut peut-être !). Cependant, à l'affichage, j'ai l'impression de perdre des informations ??
Voici en pièce jointe, un vi simple qui reprends plus ou moins mon problème (décalage de la courbe simulée dans le graphe déroulant).
Quelle architect
ure me conseillez vous ?
Attachments:
test.vi ‏174 KB

Bonjour,
Il est fortement déconseillé d'utiliser plusieurs boucles While en parallèle.
En effet, dans votre exemple, vous perdez plusieurs données lors de l'exécution.
Je vous propose une solution à votre exemple : Utiliser une seule boucle While pour les 3 affichage.
Cf. Fichier joint.
Sanaa TAZI
Application Engineer
National Instruments
Attachments:
Exemple.vi ‏161 KB

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To get an answer on this part of forum you should post in English. Another possibility is to post on the french forum here.
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Romain D.
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Je dispose d'un vi d'acquisition d'un signal (+s voies et 2 cartes PCI-4472
et PCI-4474) qui me génère un tableau de waveforms en sortie (DAQmx).
Je veux écrire différents vis d'affichage (f(t), FFT, XY,...) de ce signal
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Voici en pièce jointe, un vi simple qui reprends plus ou moins mon problème
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Quelle architecture me con
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Control signal

I'm trying to control a heating element by the
difference between the user-set target temperature and the (absolute)
extreme (user-set) temperature. I've considered testing for cases
using first and second derivatives. From some reading, I've come
across the idea of PID, but I can't view any working, accurate samples
to even see if this is where I want to go. I'm in the planning stage,
so I've only minimal code. My first step is "Intake Temperature
Signal" (currently simulated by a gentle sin wave, just for a sim).
Second, "Analyze Temp Signal"; third, "Analyze Temp Derivative(s)";
fourth, "Combine Signals" (somehow); and last, "Re-Analyze (or confirm)
Temp Signal".
Any directions to where I
can see good examples of PIDs, or confirmations that this is the
direction that will take me where I want to go?
Thanks!

I am not sure if i now understand your request better.
First of all, did you install the PID toolkit after LV? If not, please reinstall the toolkit. Otherwise, try a repairinstallation and check if you selected the LV examples.....
Next: Why i don't understand your request.
Room temperature does not matter. Your task is: You have a physical value you want to control (in your case: temperature). So you measure the current value, compare it with the desired one and then decide on how to react.
The problem you are facing is that your controlled system has different perturbations (e.g. different room temperature) and delays (how long does it take from the command "heat" until your system really increases temperature??). Those perturbations have to be taken into account in your control algorithm!
The PID control toolkit helps you in this task, but you have to develope/choose the correct algorithm and parameters nevertheless.
So your task is to find out about delays and other possible issues in your controlled system. This will help you in getting the correct algorithm. Having the algorithm, you still have to parametrize it correctly. You can find many white papers about things like this (example here). The work you have to do here is: make sure that the overshot of your controlled system does not exceed x% of your "value to set". Achieve the change within a certain amount of time......
So you see that things you currently thinking about are (at least in my opinion) too early in the step you are currently in.......
hope this helps,
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Affichages multiples temps-réel d'un signal

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