CDA ci860 Specifications Page 96

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Alarm and Event
96 3BDS011222-510 B
During a specific operational mode, for example a start-up or a shut-down, it is
common that alarms, which are relevant during a normal operation, are totally
irrelevant.
With Hiding Rules it is possible to define which alarms that will be hidden during a
specific operation. Single alarms can be hidden as well as alarms from an object and
its descendants. An exception to the above mentioned is that the hiding functionality
does not affect some of the Alarm Categories, i.e. alarms for the categories “System
Alarms” (defined by the Operator Workplace), “IM History” (defined by
Information Management), “System Alarm” (defined by 800xA for Advant Master)
and “System Condition Event” (defined by 800xA for AC 800M) will never be
hidden. The reason for this is that alarms of these categories are considered system
alarms, which can be too severe to hide.
A configurable indication in the Alarm Band shows that hidden alarms exist.
Refer to Hidden Alarms in the Alarm Band. The hidden status of alarms will also be
indicated in Faceplates.
A hidden alarm also has a hiding indication in its context menu. Select hiding and
the Hiding Rules dialog box will be displayed. Refer to Hiding Rules on page 99.
A hidden alarm is automatically acknowledged when the alarm is cleared, that is the
alarm goes from active to inactive state.
Alarm Conditions aspect
The Alarm Conditions aspect enables the user to define condition specific alarm
properties, so that various applications can retrieve alarm related status for the
individual condition of an object instead of retrieving alarm status for the object.
This is typically useful when
Using alarm conditions as the hiding condition when defining hiding rules.
Displaying alarm status in graphics for individual conditions.
Figure 31 shows the property view of the Alarm Conditions aspect for an object that
defines a condition called LevelAlarm.
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