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Removing Tags from the Total License Count (version 20)

The license count in the Canary Historian is determined by the total number of tags in the most recently written to HDB file(s), even if that tag is not receiving updates.

Each time a new HDB file is created, all tags that are part of the active logging sessions linked to that DataSet are recorded in the HDB file.  Therefore, in order deactivate a tag from using a historian tag license, the logging session must be modified and the tag removed from it.  When this is complete, a new HDB file can be created without the tag within it.

When a tag has been released from the license count, all historical data records remain in the Canary Historian but are no longer accessible for client tools like Axiom, the Excel Add-in, and Web API.

Learn how to accomplish this for the OPC UA and OPC DA Data Collectors.


Releasing Tag Licenses from the OPC UA Collector

The UA logger can remove tags from the total tag license count by updating the last HDB file automatically.

  1. Open the Canary Admin. Select the 'OPC Collector' tile.
  2. Select 'Configuration'. Select a Logging Session and navigate to the correct tag Group. Select a tag or tags (Shift and/or Control for multi select) by clicking on the tag row(s).  All selected tags should now be highlighted.
  3. Select 'REMOVE' in the top right corner. DO NOT SELECT 'REMOVE' ABOVE THE SESSION LIST.
  4. Click 'APPLY' and then 'yes' to make the change and restart the Logging Session.  All tags are now removed and the corresponding tag licenses are now free.
Do not select 'Remove' under the Session Settings window. Doing so will delete the entire session.

Releasing Tag Licenses from the OPC DA Collector

The OPC DA Collector must be configured to manually update the last HDB file.

  1. Open the Logger Administrator application.
  2. Select the Logging Session and then the Group tab associated with the tags you wish to delete.
  3. Select one or more tags to delete (Shift key allows for mass selection). Press the 'Delete' key on the keyboard. Select 'Apply'.
  4. You will be cautioned that for the change to take effect, you must ensure the 'Create new file when logging starts' box must be checked and you must stop and then restart the Logging Session.
  5. Now simply 'Stop' and then 'Start' the Logging Session.

Tags within the {Diagnostics} DataSet do not consume a tag license and are automatically installed with every Canary Historian.

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