Operating instructions

Operating alarms
9.2 Detecting queued alarms
MP 377, MP 377 PRO (WinCC flexible)
Operating Instructions, 10/2008, 6AV6691-1DR01-0AB0
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9.2 Detecting queued alarms
Introduction
You can recognize the presence of alarms which must be acknowledged by the following:
● For an HMI device with keys: The LED in the key
ACK
lights up.
● Depending on the configuration: An alarm indicator is displayed on screen.
The configuration determines whether an alarm has to be acknowledged or not. This is also
defined by the alarm class which an alarm belongs to.
LED in the "ACK" key
On an HMI device with keys, an LED is integrated in the key
ACK
. The LED is lit if there are
alarms requiring acknowledgment which must still be acknowledged.
The LED goes out when you acknowledge all alarms requiring acknowledgment.
Alarm indicator
The alarm indicator is a graphic symbol indicating pending alarms or alarms requiring
acknowledgment, depending on the configuration.
The alarm indicator flashes as long as alarms are pending for acknowledgment. The number
displayed indicates the number of pending alarms. The configuration engineer can assign
functions to be executed when the alarm indicator is operated.
Usually, the alarm indicator is only used for error alarms. Further information may be
available in your plant documentation.