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Summary, Tips, and Tricks on Repetition and Loops

Module by: National Instruments

  • Use structures on the block diagram to repeat blocks of code and to execute code conditionally or in a specific order.
  • The While Loop executes the subdiagram until the conditional terminal receives a specific Boolean value. By default, the While Loop executes its subdiagram until the conditional terminal receives a True value.
  • The For Loop executes a subdiagram a set number of times.
  • You create loops by using the cursor to drag a selection rectangle around the section of the block diagram you want to repeat or by dragging and dropping block diagram objects inside the loop.
  • The Wait Until Next ms Multiple function makes sure that each iteration occurs at certain intervals. Use this function to add timing to loops.
  • The Wait (ms) function waits a set amount of time.
  • Coercion dots appear where LabVIEW coerces a numeric representation of one terminal to match the numeric representation of another terminal.
  • Use shift registers on For Loops and While Loops to transfer values from one loop iteration to the next.
  • Create a shift register by right-clicking the left or right border of a loop and selecting Add Shift Register from the shortcut menu.
  • To configure a shift register to carry over values to the next iteration, right-click the left terminal and select Add Element from the shortcut menu.
  • The Feedback Node stores data when the loop completes an iteration, sends that value to the next iteration of the loop, and transfers any data type.
  • Use the Feedback Node to avoid unnecessarily long wires.

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