Find a source tag or replicated tag

You can replicate tag information in a 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. Select a tag in the Tag Picker.

2. If the selected tag is a source tag, in the Tags pane, right-click the selected tag in the Tags pane. 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. The SQL tab of the Results pane is updated with the modified query and the Data tab shows the corresponding data.

3. If the selected tag is a replicated tag, in the Tags pane, right-click the selected tag. Then click Find - source tag.

   • The application navigates within the Tag Picker to find the corresponding source tag. The SQL tab of the Results pane is updated with the modified query and the Data tab shows the corresponding data.

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.

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

The Find command does not navigate to the tag when the target tag is not of the type that can be shown in the current Tag Picker configuration.

For example, in the Aggregate values query type, the Tag Picker shows only Analog, Discrete, and Analog Summary tabs and you want to find a replicated state summary tag, the relevant tag is not navigated as the State Summary tab is not available. For example, a tag ‘Watervalve’ is replicated as a state summary tag called ‘WaterValve.S1M’ and as a simple tag called ‘MyServer.WaterValve.’ If you execute the command to find the ‘WaterValve.S1M’ tag, the application does not navigate and find the tag as the State Summary tab is not available.

However, if you execute the command to find the ‘MyServer.WaterValve’ tag, the application navigates and finds the tag as the Discrete tab is available.

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.

  Note: If you find a source tag or a replicated tag in a server to which you are logged on but the server is currently disconnected from the network, the Find command finds the server but the Tags pane will not list the tags from that server.