Choosing Your Programming Mode
The cRIO-905x supports three programming modes on a per slot basis.
Real-
Time
Enables you to use C Series modules directly from LabVIEW Real-Time,
using NI DAQmx.
C Series modules appear under the Real-Time Resources item in the MAX
Project Explorer window and I/O channels appear as I/O variables under
the modules. To use I/O variables, you drag and drop them from the
Project Explorer window to LabVIEW Real-Time VIs.
Use this mode to make the C Series module behave like it is in a
CompactDAQ controller, using the Real-Time NI-DAQmx and NI-XNET
drivers to communicate, and access the four counter/timers and the PFI
trigger connector on the controller.
Real-
Time
Scan
Enables you to use C Series modules directly from LabVIEW Real-Time,
using I/O variables.
C Series modules that you use in Scan Interface mode appear under the
Real-Time Scan Resources item in the MAX Project Explorer window
and I/O channels appear as I/O variables under the modules. To use I/O
variables, you drag and drop them from the Project Explorer window to
LabVIEW Real-Time VIs.
In this mode, you do not need to do any LabVIEW FPGA development.
LabVIEW programs the FPGA for you with a fixed FPGA bitfile that
communicates with all the C Series modules that RT Scan mode supports.
LabVIEW also sends C Series data to the Real-Time host to be displayed
in I/O variables. Real-Time Scan mode also enables you to dynamically
detect which types of C Series modules are plugged into chassis slots.
FPGA
Enables you to use C Series modules from LabVIEW FPGA VIs.
C Series modules appear directly under the FPGA Target item in the
MAX Project Explorer window and I/O channels appear as FPGA I/O
items under the FPGA Target. To access the I/O channels, you either
configure FPGA I/O Nodes in a LabVIEW FPGA VI or drag and drop the
I/O channels from the Project Explorer window to a LabVIEW FPGA VI
block diagram.
Use this mode to add more flexibility, customization, timing, and
synchronization to your applications. To use the CompactRIO system in
FPGA mode, you must either have the LabVIEW FPGA Module installed
on the host computer, or have access to a compiled bitfile that you can
download to the FPGA. In either case, you use the Open FPGA VI
Reference function in a LabVIEW Real-Time VI to access the FPGA VI
or bitfile.
NI cRIO-905x User Manual
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© National Instruments
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