User Manual

Alarm management
Effects of BACnet properties on alarm response
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Fire protection damper timing with BO and two feedback addresses:
Fire protection damper timing with BO and two feedback addresses:
Error condition: The damper does not close quickly enough.
Neutral zone [Nz]
[Nz] (data type Real) can be used to define a switching hysteresis for the state
transition TO_NORMAL1. This is equivalent to the standard BACnet property
Deadband.
Out of service [OoServ]
The following applies to alarm response:
[PrVal] can also change for [OoServ=TRUE].
[PrVal] is monitored for alarms irrespective of the source of any change in
[PrVal]. In other words, the value of [OoServ] does not affect the monitoring of
OFFNORMAL alarms. If [OoServ = TRUE], the [Rlb] property can be overwritten
via BACnet. However, the alarm monitoring system responds to changes in
Reliability in the same way as if [OoServ=FALSE]. This makes it possible to
simulate FAULT alarms.
In the BACnet Device Info object, this Boolean variable is FALSE at the very
time when the operating state is RUN, that is, when the D-MAP program is
being run on the automation station. All the alarm-generating blocks (including
the BACnet Device Info Object) are only monitored in the operational status
RUN. Corresponds to the standard BACnet Property Out_of_Service.