The Change Value pushbutton at the bottom of Data Log Trend allows you to Change the Value of a Tag from the Trend Display.
1. Click a Tagname from the Trend
2. Click Change Value
3. The Change Value Dialog Box Opens.
If the user does not have the Area and Level Security required by the tag, a Login Dialog Box opens.
Hint - Normally, you cannot change the value of a "Read Only" tag. Most measurements are Read Only. Even if you can change the value, the next scan will reset it to the value read from the field IO.