niagaraDriver-NiagaraSystemHistoryImport

This component defines the system tags text patterns used to import remote histories from the source NiagaraStations into the target NiagaraStation. NiagaraSystemHistoryImport descriptors reside under the Histories extension of the NiagaraStation in the NiagaraNetwork.

System history export descriptors configure the system tags properties of the remote history extensions instead of unique history IDs.

Figure 73. NiagaraSystemHistoryExporImport properties

Before you can view these properties you must have already created a system history import descriptor. To view these properties, expand Config > Drivers > NiagaraNetwork > NiagaraStation > Histories and double-click the system history import row in the Nav tree.

In addition to the standard properties (Status, Enabled and Fault Cause), these properties support this component.

Property	Value	Description
State	read-only	Reports the current state of the data transfer as: `Idle`, `Pending` or `In Progress`.
Execution Time	additional properties	Configures a time trigger that controls when to perform the function. Trigger properties are documented in the Getting Started with Niagara guide.
Last Attempt	read-only	Reports the date and time of the last attempted execution.
Last Success	read-only	Reports the date and time of the last successful execution.
Last Failure	read-only	Reports the date and time of the last execution failure.
On Demand Poll Enabled		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		References the `On Demand Poll Scheduler` rates under the NiagaraNetwork’s History Policies container slot.
Config Overrides, 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.
Config Overrides, fullPolicy	drop-down list (defaults to `Roll`)	Defines what happens 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`.
System Tag Patterns		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.

niagaraDriver-NiagaraSystemHistoryImport

Figure 73. NiagaraSystemHistoryExporImport properties

Related Links