Problems using a vi countdown

Hi all. We use a state machine that has a delay timer in one of the States. In the State with the delayed start, we want to display a countdown which passes from the start time to 0. We use the example of CountDown.VI vi to do the count.

The problem is that we are not able to pass the value of the vi of countdown counting to the façade of our main vi. Even if we use a connector component to connect the output of countdown.vi to an indicator on our façade, the indicator shows only a single value.

We used two probes to look for problems. A probe on the Countdown.vi, the other probe is on our main vi. The Countdown.vi probe is on the wire goes to the control that is located on countdown.vi. The main vi probe is on the wire coming from the CountDown.vi of our indicator. We see that the countdown.vi probe is exhausted, one would expect, but the probe on our main vi only displays a single value that never changes.

Find us the problem it's because of the While loop in Countdown.vi, but we do not know how to get there. Is it possible to change the current value of the CountDown.vi to our front rather than just the value of a?

Thank you.

The problem is that the data are not available from your countdown to the end of execution. This is how all SubVIs work and it's a very good thing because you don't want your program to continue to run away while your countdown will (in this case).

You have two options.

(1) as RTSLVU showed you, do not use a Subvi to your timer, but put it directly in the hand of VI.

(2) open the Panel front of the Subvi during its execution. The timer will be in another window, however, I don't know if this is desired.

(3) pass a reference to your front panel indicator in the Subvi. Then, inside your Subvi (countdown), you can write to the indicator using a property node.

(4) similar to the #2, you can use a secondary to display your Subvi on the main VI.

I think #3 will be easier for you, I'll see an example if I have the time.

Tags: NI Software

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