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Switching Between Calibrated Fixed-Point and Raw Integer Modes for CompactRIO I/O



Hardware: CompactRIO>>Analog Input Modules, CompactRIO>>Analog Output Modules

Problem:
How can I select either calibrated fixed-point or raw integer data types for the I/O nodes of my C-Series module?

Solution:
With LabVIEW 8.5 or later and NI-RIO 2.4 or later, this can be done by changing the Calibration Mode (Raw or Calibrated) in the properties of the C Series module. This can be done in the Project Explorer window by right-clicking the module and selecting Properties:

When you toggle between Raw and Calibrated, the I/O nodes on the block diagram will change between Blue and Grey, representing Raw and Calibrated, respectively.

To see a list of the units returned using calibrated data, refer to the KnowledgeBase 4JNCQO4H: What units are returned from C Series Analog Modules when using Fixed-Point Data

As of LabVIEW 8.6, there is an option to use the cRIO Scan Engine to interface modules directly to LabVIEW Real-Time by using I/O variables.  In this case, the option to select raw or calibrated is not available in the properties dialog.  When using Scan Mode, all data is automatically returned scaled and calibrated.

Related Links:
KnowledgeBase 4JNCQO4H: What Units Are Returned from C Series Analog Modules when using Fixed-Point Data?
Developer Zone Tutorial: Using NI CompactRIO Scan Mode with NI LabVIEW Software

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Report Date: 05/06/2008
Last Updated: 03/13/2012
Document ID: 4L5B754H

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