Bosch Security Systems | 2006-06 | 9922 141 10377 en
Plena Voice Alarm System | Installation and User Instructions | IEC60849 en | 113
IEC60849 - 5.4 Monitoring of software controlled equipment
table 9: IEC60849 - 5.4 Monitoring of software controlled equipment
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. Fault is indicated on the controller and
router. Configuration must be set up to supervise
this.
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 is indicated on the controller and
router. Configuration must be set up to supervise
this.
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 Controller and the firmware in the routers.
2 Either
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
ii Automatically reset the equipment and
give an audible and visual warning that
an automatic reset has occurred.
Compliant. Fault is indicated on the controller and
router. This function cannot be switched off.
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