How to
Configuring a Trend Log List
You configure the properties of a trend log list to meet the unique needs of your site.
The trend log list numerically displays the records of a trend log or an extended trend log. The records of the trend log can be processed by a calculation method before they are presented in the trend log list.
The trend log list can only display one trend log at a time and must be manually refreshed to display recently recorded values.
You can manually add records to a trend log list for any type of trend log.
Time Zone Modes in a Trend Log List
In a trend log list, you can present the records of a trend log in different time zones: local time zone, EcoStruxure BMS server time zone, and UTC time zone.
For more information, see Time Zone Modes in a Trend Log List .
Calculation Methods
Use a calculation method to process the records of the trend log before presenting them in a trend log list or a trend chart. The original records in the trend log are not affected by the calculation method. The calculation method is applied to the trend log records grouped by a specific time interval.
For more information, see Calculation Methods .
Period Timestamps in Trend Charts and Trend Log Lists
When a calculated value for a period is presented, the middle of the period is used as the timestamp.
Example:
The calculated value for the period 8:00-9:00 is stamped 8:30. If there is a value at 9:01, the next period is 9:00-10:00, which is stamped as 9:30. The full period may not have passed yet, but the value can be presented even if parts of the period are in the future.
Temporary Trend Log Lists
To display a trend log without creating a new trend log list or trend chart, the trend log can be displayed in a temporary list or chart.
For more information, see Temporary Trend Log Lists .
Floating Point Values NaN, INF, and -INF
In the EcoStruxure BMS software, the floating point values “Not a Number”, positive infinity, or negative infinity may be displayed in the Basic property tab, in a trend log list, or a trend chart.
For more information, see Floating Point Values NaN, INF, and –INF .
In WorkStation, in the System Tree pane, select the trend log list you want to configure.
On the File menu, click Properties .
Edit the properties:
Table: Trend Log List Properties
Component
Description
Display trend log
Enter the trend log to display in the trend log list.
Log space (records)
Select the maximum number of records to display in the trend log list.
Show events
Select True to display events in the trend log list. This function does not hide events in the list that contain a value or comment. For example, when a record is added, edited, or commented.
Time zone
Select which time perspective to display in the trend log. For more information, see Time Zone Modes in a Trend Log List .
Calculation method
Select a calculation method.
Delta over period
Select True to apply a period to the delta calculation method.
Period
Select the time span for which the calculation method is to be executed.
Custom period
Enter a custom time span for which the calculation method is to be executed.
Custom period alignment
Enter the time when you want the custom period to start.
Click OK .
Trend Log Lists
Trend Log List Properties
Configuring the Trend Log List Time Zone
Displaying the Trend Log List Time Stamps with Fractions