You have to manually add records to a manual trend log.
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, enter the date and time of the new value.
In the Value box, enter the value.
In the Comment box, type a comment.
Click Add record .
Click Close .
The record is now added to the trend log.