User Manual

Alarm management
Alarm queuing
9
158 | 353 CM110664en_07
● Alarm text
● Other technical details
Based on this information, the alarm client can present the alarm in a
comprehensible way; it may also read additional information automatically from
the alarm server, and if required, return any acknowledgement to the correct
address.
If a temporary alarm receiver does not confirm receipt with a SimpleAck
message (via the Confirmed Event Notification input), the alarm server will try
three times more to transmit the alarm to the relevant alarm receiver. The
message for this alarm client will then be lost and its reference will be deleted
from the [RecpList] of the BACnet device object.
This process is performed for all acknowledgements made on an alarm client.
The alarm can be acknowledged by any alarm client. The AcknowledgeAlarm
data record contains information as to which alarm is being acknowledged and
other details related to this alarm and the acknowledging alarm client. The
alarm acknowledgement is confirmed with a SimpleAck message by the alarm
server which generated the alarm. All other alarm clients in the network will be
sent a Confirmed Event Notification to notify them of the alarm
acknowledgement. They, in turn, will send a SimpleAck message to
acknowledge the receipt of this notification, the objective being to ensure that
all clients have up-to-date and consistent information.
Alarms can also be acknowledged and reset locally on the alarm server. The
alarm is acknowledged internally in the alarm server that generated the alarm.
Confirmed Event Notifications are now transmitted to all alarm clients, to notify
them that the alarm has been acknowledged. The alarm clients, in turn, send a
SimpleAck message to acknowledge their receipt of the Confirmed Event
Notification.
Each alarm-generating object has an [EnEvt] parameter (data type: Boolean).
Alarm messages (and system events) are only transmitted over the network if
[EnEvt=TRUE]. This does not affect the alarm monitoring of the object, that is,
the alarm state machine is always kept up to date.
9.8 Alarm queuing
Until they have been forwarded to all the pre-configured alarm recipients, all
alarm messages are normally stored in the automation station.
Each automation station has its own alarm queue for this purpose. Each
incoming alarm and each system event is entered in the queue. An entry
remains in the queue until the alarm or system event has been sent with a
confirmed event notification to all recipients listed in the notification class
object, and until the relevant acknowledgements have been received.
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Alarm
acknowledgement over
the network
Acknowledge and reset
Local alarm
acknowledgement
Disabling the routing of
alarms