User manual

TD110500-0MC
23
Calculations
A calculation reads points from one or more devices and performs a calculation on them, such as
average, minimum or maximum. Custom calculations can also be used. Calculations may be used on
graphics, trends, alarms and other calculations just like physical points.
Add a calculation in the Device Tree by right-clicking the desired node — it can be a site, driver or
device. The Calculation Wizard then appears. After the calculation has been added to the tree, left-click
it to edit it. See Calculation Editor for more information.
Calculation Wizard
Settings Tab
Label
Label is the name of the item as displayed in the Device Tree.
All items in the Device Tree are sorted alphabetically by label. Folders can be used to organize items.
Description
Description is optional text that describes the item. It can be any descriptive text or be left blank.
Group Settings Tab
These determine which user groups can see this item in the tree. Unchecking the default “Allow Everyone”
enables selecting individual groups. If a group cannot see an item, items under it are also unseen.
There are “Check All” and “Uncheck All” buttons in the upper-right corner to make major changes easier.
Advanced Tab
Name
If left blank, it will be assigned automatically. It is recommended that the default value not be changed. It
can be up to 48 characters. Only A–Z, A–Z, 0–9, period (.) and underscore (_) are allowed. Names are
case sensitive.