|
|
About the “station.limit” license feature (NiagaraAX-3.3)
Starting with NiagaraAX-3.3,
shortBrandName uses a “station.limit” parameter as part of the “eas” feature-line in a NiagaraAX license file.In addition to the “dataPoint.limit” parameter (which can be used in all
shortBrandName releases) the “station.limit” parameter is used for managing data points that are allowed to be sourced from Niagara stations under the NiagaraNetwork. The following terms describe concepts and parameters that relate to the way the station.limit parameter affects the allowed data points.Eas Config property
The Eas Config property is automatically added to a Niagara station (under the NiagaraNetwork) when that station is added under a NiagaraNetwork that contains the EasService
.
Figure 2-3 Eas Config property added to a station data property sheet
When this property is present, you can set its enabled parameter to “true” (default) or “false” in order to allow or prevent the use of unlimited data points from the associated station. When this property is set to “true”,
shortBrandName may use unlimited data points from the station. Each station that has the Eas Config property enabled counts towards the maximum number of stations specified by the station.limit license parameter.unlimited histories (data points)
When the Eas Config property is enabled on a station that has not exceeded the station.limit value,
shortBrandName may use an unlimited number of histories from that station. The data points represented by these histories do not count against the total allowed data points that are specified by the “dataPoint.limit” parameter.station.limit value
The station.limit value is set in the license file (see Figure 2-2) and specifies the maximum number of stations that are allowed to be the source of unlimited histories for use as
shortBrandName data points. For example, if the station.limit value is “2” then two stations are allowed to provide an unlimited number of data points. If a third station is added and enabled, a message appears in the Fault Cause property display: “Could not register this NiagaraStation (check eas station license limit).” Setting this station’s property to “false” clears the fault and displays the following message in the Fault Cause property: “Disabled (this station will not count towards the Eas station limit).” In this case the data points for this station are counted toward the total number of data points, as specified by the license file’s dataPoint.limit parameter.dataPoint.limit
The dataPoint.limit parameter has a value that is set in the license file (see Figure 2-2) that limits the total number of data points that are allowed to be used from all sources. These sources may include (for example) remote stations under the NiagaraNetwork, csv files, relational databases, and others. Stations that have their Eas Config property enabled can provide an unlimited number of data points that do not count toward this datapoint.limit value.
|
|
|
|