User manual

Operating Principles of XBT Terminals
106
33003962 11/2011
Alarm Management
Alarm Indication
The actual display of an alarm depends on the priority it has been allocated (see
section Display Priority below).
Alarms pending on the automation system architecture are stored in an alarm list.
The graphic below shows an Alarm LED.
The Alarm LED continuously informs the operator about the state of the alarm list:
z Off: The alarm list is empty.
z Blinking: The alarm list contains alarms which have appeared since the alarm list
was viewed (new alarms).
z On: The alarm list contains alarms which occurred before the alarm list was
viewed (alarms already displayed).
Display Priority
A priority can be associated with each alarm panel. An alarm panel has priority over
an application panel and a system panel. An alarm panel does not have priority over
a value, which is currently being entered.
Different alarm panels may have different priorities. There are 16 possible levels of
priority (the lowest display priority being priority no. 16).
Exception of Priority 0
When an alarm appears on the automation system architecture that is allocated to
a priority 0 alarm panel, the following will happen:
z The alarm panel is not displayed, but stored in the alarm list, thus the current
display will not be disturbed.
z The alarm LED blinks to signal the alarm.
When an alarm is activated, it is stored in the alarm list by the terminal.
Appearance Types
Alarm panels can appear in different ways. Alarm panels can be:
z displayed directly on the display unit
z printed directly from XBT terminals equipped with a printer connector (data-
stream printing)
z stored in the list of current alarms