Hey Lars,
Are you asking about how to stop a an RT startup application that has been deployed to the myRIO, or a VI that is running on the myRIO in interactive mode (click the run button in LabVIEW)?
If you are using interactive mode you could hit the abort button to stop the executing VI. Keep in mind this will not stop the FPGA and any configured outputs will continue to run (for example if you were generating a PWM signal the signal would continue even after you click abort). Ideally you should never have to use the abort button and should instead architect your program to terminate safely and reset all outputs to safe states.
If you've deployed an RT EXE to the myRIO and are running your application headlessly you'll need to build a shutdown routine into your code. For example you could monitor the myRIO user button and when the button is pressed stop your main loop, or some other 'safe state'. You could also use shared variables, to transfer a stop trigger to your application running on the myRIO target.
Let us know if that makes sense or if you have any more questions. If you provide some more details on your setup and application we can give more specific suggestions.
Thanks!
-Sam K
LabVIEW Hacker
Join / Follow the LabVIEW Hacker Group on google+
