History Extension view
This view configures each history extension.
Figure 428. Example of a Numeric Cov History Ext view
The screen capture uses the Numeric Cov History Ext as an example view. The other extensions support similar properties.
You access this view from the Nrio Point Manager by clicking the hyperlink next to a point on the Analog Points or Digital Points tab, followed by clicking the History Setup tab and the history name hyperlink.
Properties
In addition to the standard properties (Status, Fault Cause, and Enabled), these properties support the history extension.
| Property | Value | Description |
|---|---|---|
| Active Period | read-only | Indicates when data are being collected. |
| Active | true or false |
Indicates if data collection is currently active, as defined by the Active Period properties.
|
| History Name | wild card (%), defaults to % parent.name% | Names each history using a standardized formatting pattern. The default format automatically names histories with the name of the parent component and appends a sequential number to additional names, as necessary. |
| History Config, ID | read-only | Displays the value configured in the history extension’s History Name property. An error string here indicates that the History Name property is incorrectly defined.
|
| History Config, Source | read-only ORD | Displays the ORD of the active history extension. |
| History Config, Time Zone | read-only text | Displays the time zone of the active history extension. |
| History Config, Record Type | read-only text | Displays the data that the record holds in terms of: extension type (history) and data type (BooleanTrendRecord, numericTrendRecord, and so on). |
| History Config, Capacity | number, defaults to 500 | Defines local storage capacity for histories. |
| History Config, Full Policy | drop-down list | Defines what happens when a history table reaches its maximum record count. |
| History Config, Interval | read-only, defaults to 500 | Reports the number of records the system stores in the local station. In general, 500 or less is adequate for a controller
station because local records are exported to the Supervisor station. A large number, such as 250,000 is acceptable for Supervisor
stations. Unlimited is not recommended even for a Supervisor station.
|
| History Config, System Tags | read-only | Reports any additional metadata (the System Tag) included in a history extension. Tags are separated by semicolons. Tags can be used to filter the import and export of histories. |
| History Config, valueFacets | read-only | Defines the units to use when displaying the data. |
| History Config, minRolloverValue | read-only | Reports the smallest difference between timestamped values recorded. |
| History Config, maxRolloverValue | read-only | Reports the largest difference between timestamped values recorded. |
| History Config, precision | read-only | Reports the number of bits used for history data logging. The 64-bit option permits high precision, but consumes memory than 32-bit logging. |
| Last Record | read-only | Serves as a container for sub-properties that describe attributes of the last recorded change. The properties reported include date/time, time zone, the operation that generated the record, and the user who made the change. |
| Change Tolerance | Defaults to 0.00 | Defines a value outside of which the system records a history record for each change of value. A change of value triggers
a history record. To minimize the quantity of records created, you can configure the system to ignore changes that fall within
the tolerance amount. If a change exceeds the Change Tolerance value, the system records a history record.
|
| Precision | Defaults to 32 | Reports the number of bits used for history data logging. The 64-bit option permits high precision, but consumes memory than 32-bit logging. |
| Min Rollover Value | read-only | Reports the smallest difference between timestamped values recorded. |
| Max Rollover Value | read-only | Reports the largest difference between timestamped values recorded. |