© National Instruments Corporation 7 Getting Started with the LabVIEW Real-Time Module
The block diagram should look similar to Figure 4.
Figure 4. NI-DAQmx Control Loop with Timing
Refer to Chapter 4, Timing Applications and Acquiring Data, of the
LabVIEW Real-Time Module User Manual for information about the
different methods for timing control loops. Refer to the
examples\
Real-Time\RT Timing.llb
for examples of different timing methods.
Sending Data Out of the Time-Critical VI
The First PID Control VI can run on the RT target at time-critical priority,
but you might need to monitor the status of the VI as it runs on the target.
Also, you might need to update the values of control loop parameters. Use
the Real-Time FIFO VIs to send data between the First PID Control VI and
a normal priority communication VI that also runs on the RT target. The
communication VI on the RT target can receive data from the First PID
Control VI using Real-Time FIFOs and then use network communication
methods to update the host computer VI. Refer to the LabVIEW Real-Time
Module User Manual for information about using the Real-Time FIFO VIs.
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