Prerequisites:
- Connection to a
Supervisor station and a subordinate station
- Discovered points (configured with history extensions) on the subordinate station
Perform the following steps:
- Open the Property Sheet view of the
Supervisor’s NiagaraNetwork, and set the
Persist Fetched Tags property to true.
- Right-click the
Supervisor’s History space and click History Import Manager.
- In the History Import Manager view, select the discovered Histories on the subordinate station’s points that you want to import and click Add.
- In the
Supervisor’s NiagaraNetwork under the subordinate station, double-click on the Points folder to open the Point Manager view.
- Select the discovered points that you want to subscribe to and click Add.
- Under the
Supervisor Config node, open a Chart view on any component, and drag the points (or the Points Folder) onto the web chart.
The
Supervisor station is now subscribed to the points on the subordinate station. When you add one of the proxy points to a web chart,
the chart checks for a local enabled history extension as a child on the proxy point. If found, it uses the local history
extension’s HistoryConfig property to determine the history to plot in the chart. If not found, it uses a computed n:history tag value if the history exists on the
Supervisor.
When you drag a points folder (of proxy points) onto a web chart, the chart detects the matching histories and the n:history tags which were added to the points when imported or exported to the
Supervisor and is able to resolve the histories and initialize the web chart.
NOTE: Regarding adding a proxy point to a chart on the
Supervisor, the history data is still imported or exported by a corresponding history import/export descriptor that is configured separately. Also,
that import/export descriptor controls how frequently the history data is updated on the
Supervisor.
NOTE: The n:history tag is an implied tag that is also added to local control points if they have an active history extension child. The tag
is not limited only to
Niagara proxy points on a
Supervisor.