EIB Alarm Central Unit, surface-
mounted
75730010
Technical
Documentation
© Gebr.Berker 2005
Version: 18.08.2005
Page: 53 / 81
(Subject to prior change)
75730010.doc
Part 9
7. System Monitoring
7.1 Detector monitoring
Within a parameterizable monitoring period, the alarm central unit will check the detectors created in the safeguarding
areas whether they are still connected to the EIB, thus still being present. In this connection, the alarm central unit will
send a value-reading telegram to the bus device to be checked, e. g. to a binary input, through the group address
linked to the detector input. Such bus device must then immediately send back to the alarm central unit a value-
answer telegram after receiving the reading telegram (after 1.3 seconds at the latest). This will be done automatically,
once the „R“ flag (reading) has been set at the corresponding object of the addressed detector device (binary input).
To facilitate the monitoring of each detector it is important that the transmitting group addresses of the detectors are
unambiguous, i. e. not connected to any other transmitting bus device. Each detector should be independently con-
nected to a detector input of its own in the alarm central unit. This is the only way to ensure that solely the addressed
detector will respond.
Each detector created in the ETS plug-in will be monitored. For this purpose, you can parameterize the "detector sampling
interval" (2 s to 255 s) (default: 10 s), whereby all detectors will be sampled one by one (by the object numbers).
Example:
Sampling interval: 10 s
50 detectors have been created. One detector is sampled about every 10 s. After approx. 500 s, all detectors will
have been checked. After this, the cycle will proceed with the first detector.
If an addressed detector does not respond a fault signal (in the "disarmed" state) or a sabotage alarm (in the "armed"
state) will be raised, depending on the state of the system. Any missing sabotage detectors will also lead to a sabo-
tage signal or to an alarm in armed areas. If a missing detector raises an alarm other missing detectors may raise
subsequent alarms.
In the event of a sabotage alarm, you must first reset the latter (deactivate the alarm indicator by disarming or by an
alarm reset
"disarmed after alarm" state) before you can recognize the cause of the alarm in the display units. If
you have acknowledged all messages (e. g. missing detectors) in the display units you can use one of the arming
devices of the arming area concerned for disarming or reset the alarm to change into the "disarmed" state. If you use
the alarm reset option you can change back to the "disarmed" state without having called the messages into the dis-
play units. Subsequently, the system may change into the "fault" state if any detectors are still missing.
In the event of a fault signal, the "alarm central unit fault" EIB object will be triggered (fault = "1") until the fault has been
eliminated (missing detectors re-connected) as well as acknowledged and reset in the arming areas concerned.
You can use the arming devices of the arming area (disarming) or the alarm reset option to reset a fault signal. After
this, the system will change into the "disarmed" state.
The alarm central unit will cyclically check at a shorter interval any detectors found missing to be able to quickly rec-
ognize whether such detectors have already been re-connected.
After bus voltage recovery or after programming by the ETS, the alarm central unit will check all installed detectors
one by one at a short time interval.
Important:
- Any detectors not linked to a group address although having been created in the ETS plug-in will not be included
into detector monitoring.
- Any missing attack detectors will always lead to an attack alarm. You can only completely reset such sabotage
alarm as soon as all attack detectors are present again.
- Any missing detectors in the "fire detector" safeguarding area will only lead to a fire fault signal, thus raising no alarm.
