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Case Structures in LabVIEW

NI Software Consulting

LabVIEW, renowned for its graphical programming approach, offers an indispensable tool for handling multiple scenarios and conditions – the Case Structure. This article delves into the functionalities, applications, and best practices associated with effectively implementing Case Structures in LabVIEW.

Understanding Case Structures:

In LabVIEW, the Case Structure is a versatile programming construct that allows developers to execute different sets of code based on specified conditions. It serves as a decision-making mechanism, directing the flow of the program based on the evaluation of certain conditions or cases.

Applications of Case Structures:

  1. Conditional Execution:
    • Leverage Case Structures for executing specific portions of code based on different conditions.
    • Enhance program flexibility by accommodating various scenarios within a single VI.
  2. State Machines:
    • Construct robust state machines using Case Structures to define distinct states and transitions.
    • Streamline the development of complex systems with clear and organized state-based logic.
  3. Error Handling:
    • Implement Case Structures for effective error handling, allowing the program to respond appropriately to different error scenarios.
    • Improve the resilience and reliability of LabVIEW applications by addressing errors systematically.

Key Features and Best Practices:

  1. Modular Code Design:
    • Encapsulate specific functionalities within individual cases to promote modular and maintainable code.
    • Enhance code readability by organizing related operations within dedicated cases.
  2. Default Case Considerations:
    • Include a default case to account for unexpected conditions, ensuring that the program has a predefined response for unforeseen scenarios.
    • Use the default case to log errors, provide fallback actions, or prompt user interactions.
  3. Stateful Programming:
    • Capitalize on the stateful nature of Case Structures to build efficient and responsive applications.
    • Implement logical transitions between states to create dynamic and adaptive software systems.

LabVIEW Block Diagram Elements:

Efficiently locate and implement Case Structures in LabVIEW using “Quick Drop” (press Ctrl+Space and start typing the name). Familiarize yourself with the Case Structure icon to streamline your graphical programming workflow.

Example Code:

Explore our example code to gain hands-on experience in incorporating Case Structures into your LabVIEW projects. Witness how these structures contribute to the clarity, efficiency, and maintainability of your code.


As you navigate the diverse landscape of LabVIEW programming, mastering the strategic use of Case Structures empowers you to create robust and adaptable applications. Incorporate these insights and best practices into your programming repertoire to elevate your LabVIEW projects to new heights of efficiency and reliability