Find a source tag or replicated tag

You can replicate tag information in an AVEVA Historian from one historian to another. This allows you to replicate tag data from one or more historians (known as tier-1 historians) to one or more other historians (known as tier-2 historians). You can replicate tag data to the same server as the tier-1 historian.

You can replicate tag data directly using simple replication, where the tag information is replicated directly to the tier-2 historian. For simple replication, every value for a tag is copied. You can also set up summary tags that receive a summarized version of the tag data.

Use the Tag Picker to find a source tag or a replicated tag. You can drill down from a source tag to its replicated tag or drill up from a replicated tag to its source tag.

To find a source tag or replicated tag:

1. On the Historian tab, in the Tag Management group, click Tag Selection, and then click Tag Selection. The Tag Selection dialog box appears.

2. Select a tag in the Tag Picker.

3. If the selected tag is a source tag, do the following:

   • In the Tags pane, right-click the selected tag, point to Find - replicated tag, and then click the tag that you want to find.

     The application navigates within the Tag Picker to find the corresponding replicated tag.

4. If the selected tag is a replicated tag, do the following:

   • In the Tags pane, right-click the selected tag, and then click Find - source tag.

     The application navigates within the Tag Picker to find the corresponding source tag.

The Find command is not available if:

• Multiple tags are selected in the Tag Picker.

• A normal tag that is neither a source tag nor a replicated tag is selected in the Tag Picker.

• You use the Select tag dialog box when performing tag analysis.

  Note: You cannot execute the Find command if a source tag is deleted but its replication configuration still exists in the Historian.

The replicated tags are not listed in the context menu if:

• The replicated tags are not committed in the Historian.

• The replication schedule is removed from the Historian. For example, you are connected to a Historian 10.0 server and you create a tag called ‘MyTag’. ‘MyTag’ is replicated as a simple tag called ‘MyServer.MyTag’.

  When you execute the Find - replicated tag command, the ‘MyServer.MyTag’ tag is shown. When you execute the Find - source tag command, the ‘MyTag’ tag is shown. At this instance, if the replication link between ‘MyTag’ and ‘MyServer.MyTag’ is removed and if you execute the Find - replicated tag command, the ‘MyServer.MyTag’ tag is not shown in the list of replicated tags.

  However, if you execute the Find - source tag command, the ‘MyTag’ tag is shown as ‘MyTag’. If ‘MyServer.MyTag’ is the only replicated tag, ‘MyTag’ is considered as a normal tag.

  The above scenario holds true if the entire replication schedule is removed in the Historian. If only one replication is removed, the list shows the remaining replicated tags.