history-ConfigRule

This component determines the overrides for an existing history configuration. Its functionality is provided by the history palette.

Each Config Rule under the NiagaraNetwork’s History Policies has the following configuration properties:

Property	Value	Description
Device Pattern		String matching to device names, meaning name of station(s) that are exporting histories Default value is a wildcard (“*”), meaning all station names are matched
History Name Pattern		String matching to history names of histories being exported. Again, default value is a wildcard (“”), meaning all named histories are matched. NOTE:* Both `Device Pattern` and `History Name Pattern` must apply for the rule to be used—otherwise the next rule down (in order) in History Policies is evaluated.
Capacity	Record Count: nnn (500 default), Unlimited	Specifies local storage capacity for histories. In general, 500 (default record count) or less is adequate for a controller station because those records are usually archived (exported) to a Supervisor station. For this reason, a very large number, such as 250,000 is acceptable for Supervisor stations. `Unlimited` is not the wisest choice even for a Supervisor station.
Full Policy	Roll (default), Stop	Applies only if Capacity is set to “Record Count”. Upon specified record count, the oldest records are overwritten by newest records. `Roll` ensures that the latest data are recorded. `Stop` terminates recording when the number of stored records reaches specified history capacity. Full policy has no effect if `Capacity` is `Unlimited`.