Terminals
The icons on the block diagram that represent data are called terminals. Front panel objects appear as terminals on the block diagram. You can use three types of terminals: controls, constants, and indicators. Controls are values that the user inputs on the front panel. In the program above, a is a control. When you want to have an input that is not available on the front panel for the user to see and change, you use a constant instead of a control, which can be edited within the block diagram. In the program above, b is a constant. Indicators are the values the program generates and displays to the front panel. In the program above, a+b and a‐b are indicators.
When working with data in LabVIEW NXT, it is important to understand the different data types, as some functions only work with a certain type.