How can I detect when a sub vi finishes

Hi All,
I'm new to labview and would like some assistance.
I have produced a sub vi that generates 2 half sine wave of adjustable frequency and amplitude. These are cascaded to produce a number of cycles. These are all included in a case statement. The false state produces a dc output and the true state produces the sine cycles.
Before the button is pressed a dc level is output, when it is pressed a number of sine cycles are out and when they have finished the dc level should reappear.
I would like to know how to detect the completion of the sub vi in the true case so I can switch the case statement back to false asap.
I'm having problems with gaps in the output data when the sub vi teminates and the case statement reverts back to the false state.
Many thanks
Andy
Attachments:
PulseGeneration.vi ‏164 KB
HalfWaveBlock.vi ‏77 KB

Hello Andy
Thank you for getting in touch regarding your problem, I am an applications engineer at National Instruments and I will be supporting you with your query. As I understand you have a case structure which opens a sub vi, runs for a while and then changes back to its original state, and the problem you are having is switching from the vi execution case to an alternative case.
Thank you for sending in your vi's, I have been able to look at the HalfWaveBlock vi, but have not been able to open the pulse generation vi, could you send this again please? I can then look at your code and possible ways to implement the functionality.
There are a few options for approaching this task.
- Time the sub vi execution and add a timing condition to the case structure in your main code.
- Have a condition in the sub vi that alerts the main vi of completion.
I have also found some resources which will help you understand the functions you are using and will also give you some ideas for implementing further functionality.
- Execution Structures: http://zone.ni.com/devzone/cda/tut/p/id/12293
- VI analyser toolkit: http://zone.ni.com/devzone/cda/tut/p/id/5046
- Sub Vi indicator: http://digital.ni.com/public.nsf/allkb/26B1D8C3629475B686256DAD005816F6?OpenDocument
- Timing, Shift Registers and case structures: http://forums.ni.com/t5/forums/replypage/board-id/170/message-id/579608/tab/rich
There are also a number of examples available through the help tab and example finder window within LabVIEW itself. A few that I recommend looking at are.
- Dynamic Load Example.vi
- Dynamically Monitor VI
If you could look at these resources and send me your code, we can then both continue to work on a solution to this issue.
Regards
Stephanie L
Applications Engineer
National Instruments UK and Ireland

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