Chapter 5
Using the SCXI-1125
5-10
ni.com
Table 5-4.
Programming a Task in LabVIEW
Flowchart Step
VI or Program Step
Create Task in DAQ Assistant
Create a
DAQmx Task Name Constant
located on the
Controls»All Controls»I/O»DAQmx Name Controls
subpalette, right-click it, and select
New Task (DAQ Assistant)
.
Create a Task
Programmatically
(optional)
DAQmx Create Task.vi
—This VI is optional if you created
and configured your task using the DAQ Assistant. However, if
you use it in LabVIEW, any changes you make to the task will
not be saved to a task in MAX.
Create AI Channel
(optional)
DAQmx Create Virtual Channel.vi
(AI Voltage by default,
to change to a channel, click
AI Voltage
and select the type of
analog input you want.—This VI is optional if you created and
configured your task and channels using the DAQ Assistant. Any
channels created with this VI are not saved in the DAQ Assistant.
They are only available for the present session of the task in
LabVIEW.
Adjust Timing Settings
(optional)
DAQmx Timing.vi
(Sample Clock by default)—This VI is
optional if you created and configured your task using the DAQ
Assistant. Any timing settings modified with this VI are not
saved in the DAQ Assistant. They are only available for the
present session.
Configure Channels
(optional)
DAQmx Channel Property Node, refer to the
Channel Property Node in LabVIEW
information. This step is optional if you created and fully
configured the channels using the DAQ Assistant. Any channel
modifications made with a channel property node are not saved
in the task in the DAQ Assistant. They are only available for the
present session.
Start Measurement
DAQmx Start Task.vi
Read Measurement
DAQmx Read.vi
Analyze Data
Some examples of data analysis include filtering, scaling,
harmonic analysis, or level checking. Some data analysis tools
are located on the
Functions»Signal Analysis
subpalette and on
the
Functions»All Functions»Analyze
subpalette.
