Unless working offline, you can use the learn process to export histories in the station. As with other NiagaraAX learns, this is a two-step process in the Niagara History Export Manager, where you:
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Under a selected NiagaraStation, use its (Histories extension) Niagara Histories Export Manager view to Discover (local) station histories as candidates for export to that station as histories.
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Select and Add from those histories, creating history export descriptors under the station’s Histories container.
The Histories Export Manager reinforces this process by providing two separate panes in the view whenever you enter “Learn
Mode.” See About Learn toggle.
When you click Discover, the Histories Export Manager splits into two panes, or Learn Mode (Figure 109). The top discovered pane is a collapsed tree structure of all Niagara histories of the local station. Click to expand and select histories for export. See Discovered selection notes for more details.
In Learn Mode, the two panes in the Histories Export Manager operate as follows:
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Discovered (top pane)
Lists all histories in the local station (station you are engineering).
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Database (bottom pane)
Lists history export descriptors and history system export descriptors currently in the station database.
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Each NiagaraHistoryExport descriptor has a “one-to-one” associated history, exported to that remote station.
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Each NiagaraSystemHistoryExport descriptor may, and often does, result in many associated exported histories in the remote station. Note in the database pane you can spot these export descriptors by the blank History Id value, as well as a text value in the “System Tag Patterns” column.
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As necessary, drag the border between the two panes to resize. Also (at any time), toggle between the two-pane Learn Mode and the single-pane (Database) view by clicking the Learn Mode tool in the toolbar, or using
the Learn Mode command in the Manager menu.
The Add button is available in Learn Mode when you have one or more items selected (highlighted) in the top discovered pane. When you click Add, a dialog appears that allows you to edit properties before the history export descriptor(s) are created in the station.
The Add dialog is identical to the history export descriptor Edit dialog. For details on properties, see Niagara History Export properties.