Assortment / System Description

Technical principles, terms
25
A6V10866237_en--_b_08 273 | 275
BACnet distinguishes for alarming between Intrinsic Reporting and Algorithmic
Change Reporting. Desigo room automation uses Algorithmic Change
Reporting.
The BACnet object is not alarm capable on its own. Alarms and events
(notifications) are generated via an additional Event Enrollment object.
The event enrollment object references a value (property) for monitoring from
another BACnet object, e.g. analog input, analog value, or in the form of a
binary or multistate signal.
Details on monitoring are defined using the following event algorithms within
the event enrollment object.
Event algorithms Function
Wertänderung/
Change of value
Monitoring for change of value of an analog
value. The change of value can be individually
set.
Zustandsänderung/
Change of state
Monitoring for a definable state, such as
program state, system state, load shedding
state, silenced, door state, security level, binary
value, etc.
Bitstringwert verändert/
Change of bitstring
Monitoring a bitstring value for a specific state
such as In Alarm, or fault.
Ausser Bereich/
Out of range
Monitor Real value for a high/low limit value
including delay time and neutral zone.
Fehler bei der Befehlsausführung/
Command failure
Feedback monitoring: Monitors, via two
references, whether a feedback to a switching
command occurs within a defined period.
Nicht feste Grenze/
Floating limit
Floating limits: Can monitor, via two references,
whether the actual value is located with an
adjustable range around the setpoint.
You can still define prioritization, alarming (acknowledge and reset) as well as
response (alarm or event notification) on the event enrollment object (similar to
intrinsic reporting). In other words, all required properties are available on the
object and can be edited specific to the application during engineering as well
as from a BACnet client.
Alarms