CIRCUTOR PowerStudio Series - Manual (Page 72)

PowerStudio
72 User Manual
This permits selection of the number of decimal
places for the calculated variable.
This allows the units in which the calculated variable will be expressed to
be selected. There are units already added by default or personalised units may be entered.
This allows a variable calculation to be activated only in the time
bands in which the type of time of the selected filter is active.
Here you may enable or disable the ability to change the value of the variable
from the SCADA screen, or an event may be enabled or disabled . Only variables that do not
contain references to other variables, devices or calculations in the formula may be forced.
Allows for enabling or disabling the possibility of recalling the
last forced value of the variable. This field is useful for rebooting the software using the last forced
value.
Allows for enabling or disabling incremental calculation of the variable.
This field is useful for viewing incremental, as opposed to absolute variable values.
This allows for enabling or disabling if the calculation of the variable has to be
considered incremental. This field is useful for viewing incremental, as opposed to absolute, variable
values. The maximum incremental value can be varied between Personalised, 32, 16 or 8 bits.
Enables the grouping criteria for virtual values in graphs,
tables and reports to be selected. For example, if a value is given every 5 minutes (e.g. 10, 12 and 7),
and the values are grouped every 15 minutes, i.e., all three values expressed at once, the value
obtained will be:
• Maximum value: The maximum value of the 3 (12) will be shown.
• Minimum value: The minimum value of the 3 (7) will be shown.
• Average value: The average value of the 3 ((10 + 12 + 7) / 3 = 9.66) will be shown.
• Last value: The last value (7) will be displayed
• Sum of the values: The sum of the values will be shown (10 + 12 + 7 = 29).
Here the formula
which will give the result of the virtual variable is shown. It can be entered manually or using the
“wizard”
(see 11.1.1 Expressions and Conditions Creation Wizard). Once entered the formula
will be automatically analyzed and where it can be used will be shown. For example:
It can be used on SCADA screen and reports, to make graphs and tables with the values
obtained, it can be used in the event conditions, but a filter cannot be applied.