You have to manually add records to a manual trend log.
The Add trend log record dialog box is only applicable to manual trend logs.
In WorkStation, in the System Tree pane, select the folder or SmartStruxure server where the trend log is located.
Select the manual trend log you want add a value to.
On the Actions menu, point to Modification, and then click Add log record .
In the Time stamp box, type the time of the new value.
In the Data type box, select Number if the value is an integer or decimal.
In the Value box, type the value.
In the Comment box, type a comment.
Click Add record .
Click Close .
The record is now added to the trend log.