Hi, I have a subvi which has a while loop, and It is located in my main vi in a sequence structure, I want to stop the loop inside of the subvi using a boolean in main vi. I tried global variable but It didn't work since the stop botton in my main vi doesn't get updated when the program is running... could you please help me? I appreciate any ideas 🙂 thanks:) Darya

As a general rule of thumb, you should avoid using Sequence Structures. The reason being that they break data flow. If you can control the flow of data with wires, that is the most efficient way to make your program work. So the suggestion to get rid of your sequence structures is to make another subVI for your wait that also has an Error In and Error Out. Then you can use the error cluster to force the execution. And having While loops inside of subVIs is a common beginner problem. If you are controlling when the loop ends based on a front panel control from the mainVI, then the loop really needs to be in the main VI. I hope that was a good summary of what has been said.