Xylem STORM Central - Manual (Page 19)

17
Setup alarms
Testing an Alarm is performed by pressing
the ‘Evaluate’ button. If the result of
the Condition is true and the Alarm
has not been disabled, all Actions and
Notifications will also be run. If an error is
displayed, a syntax or typographical error
was discovered when trying to evaluate
the Alarm Condition. It will need to be
corrected before the Condition can be
properly evaluated.
Test an Alarm
If a more complex Alarm is desired, the
Advanced Alarm Condition can be used to
describe nearly any combination of Sites,
Sensors, and other functions. For example,
the image on the right shows an Alarm
Condition that will evaluate to true when
Stage from the UpperDam Site is greater
than 26.8 and Rain from the GageHouse
Site is greater than 0.30.
Supported syntax:
Using another Alarm’s result can help you set up differing levels of Alarms. For example, if you
already had an UpperDamAlarm set up, you could rewrite the above Advanced Condition as
{UpperDamAlarm} AND [GageHouse~Rain] > 0.30.
Complex Alarm
Retrieve the latest value of a Site’s Sensor
(case-sensitive): [SiteName~Sensor]
Logical operators: OR, AND, ==, !=, >, <,
>=, <=
Built-in functions: RSUM, MIN,MAX
where RSUM is the Reimann Sum. Syntax for these functions is Function(x,y) where x is a
[SiteName~Sensor], and y is the number of previous samples from the most recent to include in
the calculation. For example, MIN([Site1~Battery],5) would retrieve the minimum Battery value
from the last five samples recorded for Site1.
Retrieve the result of another Alarm (case-sensitive): {AlarmName}