User Manual

Alarm management
Alarm management by notification class
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Each alarm-generating object is assigned one notification class [NotifCl] only, but one notification class
can be used by more than one alarm-generating object. This makes it possible to create a Notification
Class object for each group of alarms (e.g., HVAC alarms, fire alarms etc.). Each alarm source in a given
alarm group is assigned to the [NotifCl] for that group.
There are global and local notification class objects:
● Global notification class: One set of max. 18 global notification class objects per site. Global notification
classes are replicated and thus exist on all Desigo PX of a site in identical form.
● Local notification class: On Desigo PX, local notification classes can be engineered, but are NOT
replicated.
● Desigo room automation supports exclusively local notification classes.
Interface definition
The notification class function block [NotifCl] is the means by which functionality is transferred from the
BACnet standard into the CFC environment.
This function block contains the instance number of the Notification Class (an integer). which must be
identical to the value entered in the subordinate alarm sources. This makes it possible to create a unique
reference.
The number must not be modified online.
Notification class number
There are 18 predefined global notification classes. The notification class is identified with the two
independent variables AlarmFunction and AlarmClass, and referenced in the alarm source:
● AlarmFunction [Simple(1), Basic(2), Extended Alarm(3)]
● AlarmClass [UrgentAlarm (1), HighPrioAlarm (2), NormalAlarm (3), LowPrioAlarm (4),
UserDefinedAlarm (5) and OffLineTrend (6)]
Formula
The notification class number is calculated as follows:
NotificationClass# := 10 * AlarmClass + AlarmFunction
This gives the following notification classes:
AlarmClass AlarmFunction Priority
(default values)
To-Offnormal
To-Fault
To-Normal
Uses NotificationClass#
(derived)
Highly critical alarms,
system messages, device
info object
UrgentAlarm Simple 1, 1, 5 11
UrgentAlarm Basic 1, 1, 5 12