Bacnet Bit String Trend Log Ext (bacnet-BacnetBitStringTrendLogExt)
Figure 94. Bacnet Bit String Trend Log Ext properties
To access these properties, expand and double-click the BacnetBitStringTrendLogExt.
In addition to the common properties (Status, Fault Cause and Enabled), this component has these properties.
| Property | Value | Description |
|---|---|---|
| Active Period, Days of the Week | check boxes (all default to enabled) | Specifies the days of the week to include in the function. |
| Active Period, Time Range | from and to times (both default to 12 AM EDT | Configures when the time period starts and ends. |
| Active | read-only | Indicates the current state of the trend log based on the Active Period.
|
| History Name | BFormat string (defaults to %parent.name%) | Defines a pattern for deriving the name of the history created by this extension. It can be static text or a simple pattern that allows the actual history name to be derived from the context. The default value (%parent.name%) sets the history name in the Id to the name of the parent of this extension. Changes to this property cause the format to be reapplied and the history Id in the history config is to be updated. |
| History Name Format | BFormat string plus text (defaults to %parent.name% Log) | Specifies the name of the trend log using a BFormat string. |
| History Config | additional properties | Serves as a container for sub-properties used to configure the attributes of the history record stored in theHistory space.
A separate topic documents these properties. |
| Last record | read-only | Stores a copy of the most recent record successfully appended to the history for this extension. |
| Interval | hours, minutes, seconds | Controls data collection behavior for this Trend Log component.
If the If the |
| Precision | 32 bit (default), 64 bit | Selects 32 bit or 64 bit options for the history data logging. The 64 bit option allows for higher level of precision but consumes more memory. |
| Min Rollover Value | number (defaults to null) | Defines the starting point for calculations for cumulative logging after a rollover. Rollover occurs after a running total
maximum value is reached. Select the null option if a Min Rollover Value is unknown. Refer to the Niagara Histories Guide for the details about rollover and delta logging.
|
| Max Rollover Value | number (defaults to null) | Defines a maximum value for calculations when a rollover is detected by the history logging process. Using this parameter
and the Min Rollover Value parameter helps you avoid getting negative numbers when you are logging running total data, such as energy usage. Refer to
the Niagara Histories Guide for more details about rollover and delta logging.
|
| Total Record Count | read-only | Indicates the total number of records collected by the Trend Log object since creation. When the value of Total Record Count reaches its maximum possible value, the next value it takes is zero. |
| Property Id | read-only | Defines the specific data item being proxied. Often, this is Present Value or Event State. This unique numeric value correlates to and identifies the data item. For example, the number 85 correlates to a present-value
property.
NOTE: Changing this ID on an existing BACnet proxy point can produce undesirable results, especially if the change assigns a different
control point type. Instead, make a new proxy point.
|
| Length | read-only |