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While execution highlighting slows the execution of your code, single-stepping allows you to have more control of viewing individual actions of the program. With execution highlighting, execution slows down, and the code executes until completion. With single-stepping, you can execute a single node at a time, causing the program to pause after the node completes.

There are three ways to use single-stepping: Step In, Step Out, and Step Over. You can find these options on the Debug tab.

Step In—If a node is a subVI and represents more LabVIEW code, use this option to display the code and pause execution. For a node that you cannot open, use this option to highlight the node and pause its execution.

Step Out— Complete the execution of the current diagram or subdiagram and pause.

Step OverExecute a node without stepping into the node and pause at the next node.

While single-stepping, you will notice the following behaviors:
  • When you single-step through code, nodes are highlighted to indicate they are ready to execute.
  • Gray lines appear in a loop or a diagram to indicate that the section of code has finished executing but the program is still running.