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Verifying Your Tag Data in Tag Viewer

Last Modified: June 22, 2021

Troubleshoot your test and measurement data in Tag Viewer to verify your system returns tag data as expected.

Before you start troubleshooting your tag data in Tag Viewer, you must:
  • Verify the system for which you want to obtain and communicate tag data is a managed system in Systems Manager.
  • Verify the application sending tag data to your SystemLink Server is running.
  1. In NI SystemLink Web Application, click Tag Viewer.
  2. Search for a tag in one of the following ways:
    • Type a tag path or part of a tag path in the search bar.
    • Click the filter button next to the search bar to search for exact matches. You can include multiple queries, but only tags matching all the queries return as results.
    You can use the wildcard character (*) when you search by path.
  3. Double-click the tag to open it.
  4. Under Tag Details, verify the details for the tag appear accurate.
    1. Verify the tag value updates at the time interval you set in the application.
    2. Verify the data type of your tag is correct.
    3. Verify the workspace your tag belongs to is correct.
  5. Optional: Under History, review the graph to visualize your data.

    To view historical data, you must have Retention set to either Count, Duration, or Permanent. If you set Retention to None, SystemLink will not retain the historical data of your tag.

    1. If you see an event where your data did not perform as expected, select the magnifying glass to examine the value closer.
    2. Click the camera ( ) to capture the data for analysis.
    3. To return to the default view of the historical tag values, double-click the graph.
  6. If your data is not performing as expected, debug your application in the programming environment. The following table highlights common troubleshooting tips.
    Instructions Example
    Verify the endpoint of your application is your SystemLink Server URL.

    The protocol must be HTTP.

    Verify you defined the tag path with dot separators. Station1.Temperature.BuildingA
    Verify your Salt minion's ID is correct. There are two ways you can locate your system's minion ID:
    • On disk
      • (Windows) C:\ProgramData\National Instruments\salt\conf\minion_id
      • (Linux RT) \etc\salt\minion_id
    • In LabVIEW 2016 or later
      1. Add Build Path to the block diagram.
      2. Specify the tag name, or path, and wire it to Build Path.

        Use dot separators instead of slashes or hyphens; for example, Station1.Temperature.

      3. Leave the namespace (top-level VI) input empty.
      4. Wire an indicator to Build Path.
      5. Execute the application to obtain the minion ID.
    <hostname>_<MAC address>-<serial number>

    Refer to Transferring Data Using Tags in this manual for more information.

  7. After you finish debugging your application, reopen Tag Viewer and confirm the tag values return as expected.

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