Programming instructions

Chapter 3 Basic LabVIEW Data Acquisition Concepts
LabVIEW Data Acquisition Basics Manual 3-4
© National Instruments Corporation
DAQ VI Organization
In most of the DAQ VI subpalettes, the VIs are arranged in different levels
according to their functionality. You can find some of the following four
levels of DAQ VIs within the DAQ VI subpalettes.
•Easy VIs
• Intermediate VIs
• Utility VIs
• Advanced VIs
A good example of a palette that contains all of the available levels of
DAQ VIs is the
Analog Input
palette. Figure 3-3 shows this palette.
Figure 3-3.
Analog Input VI Palette Organization
Easy VIs
The Easy VIs perform simple DAQ operations and are typically the first
row of VIs in the DAQ palettes. You can run these VIs from the front panel
or use them as subVIs in basic applications.
These VIs are stand-alone in that you only need one Easy VI to perform
each basic DAQ operation. Unlike intermediate- and advanced-level VIs,
Easy VIs automatically alert you to errors with a dialog box that asks you
to stop the execution of the VI or to ignore the error.
The Easy VIs actually are usually composed of Intermediate VIs, which
are in turn composed of Advanced VIs. The Easy VIs provide a basic,
convenient interface with only the most commonly used inputs and outputs.
For more complex applications, you should use the intermediate- or
advanced-level VIs for more functionality and better performance.
Easy Analog Input VIs
Intermediate
Analog Input VIs
Advanced
Analog Input VIs
Analog Input Utility VIs