National Instruments 1141 用户手册

© National Instruments Corporation

You can use property nodes in LabVIEW to manually configure the 
channels. To create a LabVIEW property node, complete the following 
steps:

1.

Launch LabVIEW.

2.

Create the property node in a new VI or in an existing VI.

3.

Open the block diagram view.

4.

From the Functions toolbox, select All Functions»NI 
Measurements»DAQmx - Data Acquisition, and select 

DAQmx 

Channel Property Node

.

5.

The ActiveChans property is displayed by default. This allows you to 
specify exactly what channel(s) you want to configure. If you want to 
configure several channels with different properties, separate the lists 
of properties with another Active Channels box and assign the 
appropriate channel to each list of properties.

If you do not use Active Channels, the properties are set on all of the channels in 

the task.

Display Data

You can use graphical tools such as charts, gauges, and graphs 
to display the data. Some display tools are located on the 
Controls»All Controls»Numeric»Numeric Indicator 
subpalette and Controls»All Controls»Graph subpalette.

Continue Sampling

For continuous sampling, use a While Loop. If you are using 
hardware timing, you also need to set the 

DAQmx Timing.vi

 

sample mode to Continuous Samples. To do this, right-click the 
terminal of the 

DAQmx Timing.vi

 labeled sample mode and 

click Create»Constant. Click the box that opens on the block 
diagram and select Continuous Samples.

Stop Measurement

DAQmx Stop Task.vi

 (This VI is optional, clearing the task 

automatically stops the task.)

Clear Task

DAQmx Clear Task.vi

Table 5-6.  Programming a Task in LabVIEW (Continued)