Operating Alarms - Siemens SIMATIC HMI OP 77B Operating Instructions Manual

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6.2 Operating Alarms

Alarm classes
The alarm classes can exist in a project:
• User-defined alarms
A user-defined alarm can be assigned to one of the
following alarm classes:
– Fault
Alarms in this category must always be
acknowledged.
– Operation
– User-defined alarm classes
The properties of this alarm class are defined
during configuration.
• System events
A system event is assigned to the "System" event
category.
The related alarms consist of static text. They can also
contain tags. It is possible to configure an alarm text to
flash.
A maximum of 80 characters per alarm are possible.
"Fault" alarm class
The occurrence of an alarm of the alarm class "Fault" is
indicated by the flashing "alarm indicator" LED:
Figure 6–5 "Alarm indicator" LED
The "alarm indicator" LED
• is off when no alarms of the "Fault" alarm class are
queued,
• flashes when an alarm of the "Fault" alarm class has
been received but not acknowledged and
• only lights up if acknowledged alarms of the "Fault"
alarm class are present.
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Operating Instructions (Compact) OP 77B
6AV6691-1EA01-0AB0