5.1 Sensors
In order to ensure an adequate system
functionality the sensors employed should ensure communication compatibility in
accordance with the relevant intermational marine interface standard*; and provide
information about their pperational status and about the latency and validity of
essential information.
5.2 Alarm
management
5.2.1 The IBS alarm management, as a
minimum, should comply with the repuirements of the Code on Alarms and Indicators,
1995(resolution A.830(19)).
5.2.2
Appropriate alarm management on proiority and functional groups should be provided
within the IBS.
5.2.3 The number of alarm
types and their release should be kept as low as possible by providing indications
for information of lower importance.
5.2.4 Alarms should be displayed so that the alarm reason and the
resultion functional restrictions can be easily understood. Indications should be
self-explanatory.
5.3 Power interruptions and
shut-down
5.3.1 If subjected to an orderly
shut-down, the IBS should, upon tum-on, come to an initial default state.
5.3.2 After a power interruption full
functionality of the IBS should be available after recovery 000 of all subsystems.
The IBS should not increase the recovery time of individual subsystem functions
after power restoration.
5.3.3 If subject
to a power interruption the IBS should, upon restoration of power, maintain the
configuration in use and continue automated operation, as far as practicable. Safety
related automatic functions should only be restored upon confirmation by the
operator.
5.4 Power supply
5.4.1 Power supply requirements applying
to parts of the IBS as a result of other IMO requirements should remain applicable.
5.4.2 The IBS should be supplied:
.1 from the main and emergency sources of electrical power with
automated changeover through a local distribution board with provision to preclude
inadvertent shut-down;
.2 from a
transitional source of electrical power for a duraion of not less than 1 min; and
.3 where required, parts of the IBS
should also be supplied from a reserve source of electrical power.
*IEC 1162 Publication