New/Edit Niagara System History Import descriptor
This window sets up a history import descriptor that uses tags instead of history IDs to import histories.
To open this window, expand , double-click Histories click New, select Niagara System History Import from the drop-down Type to Add menu and click OK.
| Property | Value | Description |
|---|---|---|
| Name | text (default begins with Local_ for any history originating from the local station. If you are adding a descriptor this property defaults to NiagaraSystemHistoryImport appending numerals as needed to keep unique.) | Provides a name for the object.
Editing this property is equivalent to the right-clicking Rename command on the component. In this case, the object is a system history import descriptor
. Typically you leave this name at its default value.Editing this name does not affect name of resulting history that was already exported into a remote station. |
| History Id | text | Together the two names identify
the CSV file to import from the local Supervisor PC. Histories originating in the local station show a caret (^), which is shorthand for the local station, and source history names. Typically, you leave both at their default values. |
| Execution Time | additional properties (Trigger Mode defaults to Daily) | Configures a time trigger
that controls when to perform the function. Trigger properties are documented in the Getting Started with Niagara guide. |
| Capacity | drop-down list (defaults to Unlimited) | Defines the maximum number of
history records allowed in the associated table. Unlimited enforces no limitation on the number of records. Record Count opens an additional property for defining the table limit. |
| Full Policy | drop-down list (defaults to Roll) | Defines what should happen
if Capacity is set to Record Count and the specified record count is reached. Roll overwrites the oldest records with the newest ones. This ensures that the latest data are recorded. Stop terminates recording when the number of stored records reaches the specified capacity. Full policy has no effect if Capacity is Unlimited. |
| On Demand Poll Enabled | true (default) or false | Enables and disables polling. true enables a system user to use the Live Updates (play) button in History views to poll for live data for the associated imported history(ies). false renders this button unavailable in history views for the associated imported history(ies). |
| On Demand Poll Frequency | drop-down list | References the On Demand Poll Scheduler rates under the NiagaraNetwork’s History Policies container slot. |
| System Tag Patterns | text | Specifies one or more
text strings matched against text values in the System Tags properties
of a local history extensions, where matching text patterns result
in histories exported into the remote history space. |