First call function problem

hello there,
i am using labview's first call function inside a for loop, inside a sequence structure. inside the for loop the function works fine activating a true/false structure, however, when i attempt to do the same thing outside the for loop i get a broken arrow. It says that the the tunnel of the case structure, to which i have wired the first call function, is missing an assignment to it. Cant understand why it is fine in one part and not in the other. Perhaps somebody has encountered this before? I have atttached the relevant code
Thank you
Dave
Attachments:
forum.vi ‏467 KB

Stranger, I think if you will look closely at the case statement you will see that you have inadvertently added an output tunnel. Either delete the case and redo it or just click on the input tunnel and move it down enough to see and delete the unwired output tunnel.
goldie

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Call function problem

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First call is always true

I want to set the value of a numeric slider every time a sertain mode is set. I would suspect the "first call' would be the obvius solution. But for some reson it is always
'true"
Is there a nother good way of solving this problem, or am I doing somthing wrong?
/REO
Attachments:
Rhino interface.vi ‏290 KB

Hai,
The first call function will always return TRUE in your case the reason is as follows: When a VI runs for the first time this fuction returns TRUE and this VI should remain in memory (in execution mode) so that when it is called the next time it will give FALSE. But the vi does not stay in memory i.e. when you press run button it executes and unloads from memory when execution completes.
One Workaround is keep the VI in memory or put a while loop with unintialized shift register and should run only once! Look at the VI that i have attached.
Hope this helps.
With regards,
JK
(Certified LabVIEW Developer)
Give Kudos for Good Answers, and Mark it a solution if your problem is solved.
Attachments:
Rhino interface1.vi ‏129 KB

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Why don't you place the "first call?" primitive inside the subVI?
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Hi there dear SDN community members.
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