Tag Query Tab

Context

You use the Tag Query tab to specify the tags required for the query in the query process.

Procedure

  1. On the Plant Connectivity Management Console screen, select an agent instance and click on the Tag Query tab.
  2. For information you need to enter, use the following table:

    Field

    Description

    Cache Mode

    • Access to Data Source Only

      With this setting, all data is retrieved directly from the data source for queries. With this setting, performance is slowest.

    • Access to Cache, to Data Source as Required

      With this setting, for a query, the cache is first checked to see whether there are tags and metadata. If not, the tags are retrieved from the data source and added to the cache.

    • Access Using Aliases Only

      You use this setting if you have previously created an alias for the source system. An alias is a user-defined structure for tags, metadata, and secondary elements. The alias is loaded when the agent starts. See also: Source System: Aliases Tab.

    • Access to Cache Only

      With this setting, all tags are queried from the data source and stored in the cache. Metadata is retrieved when a tag is requested.

    Mask

    Here you can restrict selection of the tags. For example, if you specify INT*, only those tags whose name begins with Int are chosen from the source system.

    Note: This field is only valid in combination with the cache mode Cache. See: Filter Functions.

    Alias

    Name of the alias file to be used.