EIB Alarm Central Unit, surface-
mounted
75730010
Technical
Documentation
© Gebr.Berker 2005
Version: 18.08.2005
Page: 54 / 81
(Subject to prior change)
75730010.doc
Part 9
7.2 Heartbeat check
Particularly large objects (arcades, extensive factory units) can possibly not be safeguarded by one alarm central unit
alone but require several alarm central units, each of them monitoring partial complexes.
Such alarm central units can communicate with one another by sending and receiving telegrams for mutual monitor-
ing. In this connection, you can interconnect even more than two systems.
Heartbeat
check
Output
Input
EIB
Output
Input
Heartbeat
check
Heartbeat
check
Output
Input
Output
Input
.
.
.
Output
Input
Heartbeat
check
Heartbeat
check
You can enable heartbeat checking from the ETS plug-in in the "system monitoring/EIB alarm system, security" pa-
rameter branch. If you have set the "heartbeat check" parameter to "yes" you must parameterize an interval time
(heartbeat check interval" 2 s to 255 s). After this time has elapsed, the alarm central unit will cyclically send the
heartbeat check telegram to the bus through the "heartbeat check output" EIB object, regardless of what the state of
the system is.
Within one monitoring period (fixed to three times the parameterized heartbeat check interval time), the alarm central
unit is awaiting the heartbeat check telegram from the other alarm central unit through the "heartbeat check input" EIB
object. If no telegram is received within the monitoring period (thus coming up to three missing telegrams) the re-
sponse of the alarm central unit can be defined by the "missing heartbeat check" parameter. Thus, a sabotage signal
may be caused in the event of an abortive heartbeat check ("as sabotage" setting), or the "fault signal to the ATD" and
"alarm central unit fault" inputs may only be triggered (set to "fault signal to the ATD").
If you want to raise a sabotage signal a fault signal will be issued in the "disarmed" system state ("alarm central unit
fault") and a sabotage alarm (for configuration 1: "attack alarm") raised in the "armed" system state.
The polarity of the heartbeat check telegrams will be toggled for each telegram transmission. The alarm central units
will only check the "heartbeat check input" object for an update (regardless of what its polarity is).
If more than two alarm central units monitor one another not all systems will recognize the function failure of an alarm
central unit in the event of a fault. Solely the alarm central unit connected behind the system which has failed will
detect the abortive heartbeat check and will raise a fault or sabotage signal.
You should parameterize an identical heartbeat check interval for all alarm central units which communicate with one
another.
