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Archived: I Cannot See the Virtual Channels that I Created and Saved in a Configuration File

This document has been archived and is no longer updated by National Instruments

Note: This page is about NI-DAQ also known as Traditional NI-DAQ (Legacy). NI-DAQmx replaced Traditional NI-DAQ (Legacy) in 2003. NI strongly recommends using NI-DAQmx for new designs and migrating existing Traditional NI-DAQ (Legacy) applications to NI-DAQmx. Please review the Getting Started with NI-DAQmx guide for more information on migration.


Primary Software:
Primary Software Version: 6.9.3
Primary Software Fixed Version: N/A
Secondary Software:

Problem: I created three virtual channels (A, B, and C) in Measurement & Automation Explorer (MAX) and then selected Tools»Save Configuration As and saved the configuration file. After saving the configuration, I deleted the virtual channels (A, B, and C) and created three other virtual channels (D, E, and F). Then I closed MAX. When I opened MAX again, I saw the virtual channels D, E, and F. I selected Tools»Set Active Configuration and chose the configuration file I previously saved with the virtual channels A, B, and C.

However, I see only the channels D, E, and F instead of A, B, and C. What happened to the virtual channels A, B, and C that I saved?

Solution: The following examples describes this problem and its solution.

Suppose you open MAX, create three virtual channels (A, B, and C), and save the configuration as test.daq. Now the active configuration is test.daq. You then delete the virtual channels A, B, and C and create virtual channels D, E, and F. That means you delete A, B, and C from test.daq and create D, E, and F in test.daq. The test.daq configuration file contains the virtual channels D, E, and F. Virtual channels A, B, and C are deleted. Close and reopen MAX. MAX opens the last saved active configuration file, test.daq, and you see the channels D, E, and F.

To eliminate this problem, complete the following steps.
  1. Open MAX.

  2. Create the virtual channels A, B, and C.

  3. Save the configuration as test.daq. The test.daq configuration file contains the virtual channels A, B, and C.

  4. Save the configuration by a different name, such as test1.daq. The active configuration file is test1.daq, which also contains the virtual channels A, B, and C.

  5. Delete these virtual channels and create the new virtual channels D, E, and F.

  6. Close MAX.

  7. Open MAX. MAX opens the last saved active configuration file, test1.daq. test1.daq contains the virtual channels D, E, and F.

  8. Select Tools»Set Active Configuration and navigate to the test.daq configuration file. This file contains the virtual channels A, B, and C. You should see the virtual channels A, B, and C. If you select Tools»Set Active Configuration File and select test1.daq, you see the virtual channels D, E and F.


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Report Date: 12/09/2002
Last Updated: 04/09/2003
Document ID: 2S8K2L2O

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