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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | EN60849: 1998 en | 20
EN60849 - 5.4 Monitoring of software controlled equipment
EN60849 - 5.5 Interface with emergency detection system
Requirement Compliance Signature
The correct execution of the system software by any
microprocessor shall be monitored by internal self-
checking procedures and by an appropriate monitoring
circuit (e.g. "watch dog" circuit) complying with the
following:
a The monitoring circuit and its associated indication
and signalling circuits shall not be prevented from
determining and signalling a fault condition by the
failure of any microprocessor or associated clock
circuits.
Compliant.
b The monitoring circuit shall monitor the execution of
routines associated with the main program
elements (i.e. it shall not be solely associated with
"waiting" or other "housekeeping" routines).
Compliant. Indication on Call Station Basic and Call
Station Kit if properly installed.
c In the event of a failure by a microprocessor to
execute its software correctly, the monitoring circuit
shall (in addition to initiating an audible and visual
fault warning) perform as follows:
Compliant. Fault are indicated by a control output of the
Network Controller, if properly installed. Responsibility
of the installer.
1 re-initialize the processor and attempt to restart
the program at a suitable point within 10 s of
the occurrence of the failure. The re-
initialisation procedure shall verify that the
contents of memory, both program and data,
are not corrupted, and
Compliant, both data and program are checked for the
Network Controller and the firmware in the units.
2either
i record that a failure has occurred (using a
system capable of recording a minimum of
99 failures and re-settable only by an
operation restricted to authorized servicing
personnel) or
Compliant.
ii automatically reset the equipment and give
an audible and visual warning that an
automatic reset has occurred.
Requirement Compliance Signature
The communication link between the emergency
detection system and the sound system shall be
continuously monitored for faults. This is normally
performed by the control equipment for the emergency
detection system, which gives an audible and visual
indication of a fault in the link between the two systems.
Compliant, if properly installed using supervised control
inputs. Responsibility of the installer.
The emergency detection system shall also be capable
of receiving information regarding faults in the sound
system and shall include a provision, usually at its
control and indicating equipment, for appropriate
audible and visual indication of such faults. As a
minimum, the sound system shall be capable of
transmitting to the emergency detection system one
general "Sound system fault" for any of the fault
conditions listed in 5.3 that may occur within the sound
system.
Compliant, if properly installed using control outputs.
Responsibility of the installer.
The link between a fire detection and alarm system and
the voice alarm system is of crucial importance in
maintaining the integrity of overall operation. It may be
desirable on larger systems, where distributed control
equipment is used, to provide a link at each control
equipment location rather than to rely on a central
location. Each link shall be monitored. The voice alarm
system shall be capable of continuing to broadcast
alarm messages, which have been initiated by the fire
detection and alarm system, even in the event of a
subsequent fault in the interconnecting link between
the two systems (i.e. the voice alarm system shall
"latch" on receipt of a signal from the fire detection and
alarm system). Interruption by higher priority broadcasts
shall still be possible.
Compliant, if properly installed. Responsibility of the
installer. Control input should be in toggle mode.