How can I generate 2 AOs ? ( ONLY ONE ok )

Hello everyone,
I need to generate 2 different square waveform AOs ( both have a 1sec cycle) : 
  N°1 : 5 ms high and the rest of the time low
  N°2 : 14 ms high end the rest of the time low
n°1 and n°2 work fine when generated seperatly. However, the VI I have attached doesn't work when I want to generate  both signals at the same time.
(I am using a PCI-6221 card and Labview 8.0)
Would anybody know how I could generated those two signals at the same time?
Any help would be great,
Marc
Attachments:
2 AOs.vi ‏55 KB

Cela n'est malheureusement pas possible avec une seule carte PCI-6221 car - comme indiqué dans le message d'erreur - les deux tâches entrent en conflit puisqu'elles utilisent la même ressource de la carte. Une solution - malheureusement onéreuse - consiste à utiliser deux cartes.
Une deuxième solution pourrait consister à générer l'un des signaux à l'aide d'une autre ressource de la carte (sortie compteur ou numérique). Dans ce cas, la tension de sortie sera limitée à la plage TTL.
Une troisième solution est décrite dans ce document. Elle consiste à utiliser un timing software pour la génération de l'un des deux signaux.  Ceci n'est applicable uniquement si l'un des deux signaux ne varie pas trop rapidement et que les exigences au niveau de la précision du timing pour ce signal ne sont pas trop élevées. Selon la précision attendue pour la durée de l'impulsion de 14ms, cela pourrait être une variante. 

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