Siemens simatic hmi op27 Equipment Manual page 31

General Operation
Message indicator The message indicator indicates that alarm messages have been received.
Not flashing:
Flashing:
Window
Message window:
By default, the window for system messages is displayed in the top part of the
screen area. If another window occupies this position on the OP37, the system
message window appears at a vacant position. The locations of the event mes-
sage and alarm message windows can be configured.
Help window:
The window for displaying configured help texts appears at the bottom left of
the screen.
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Alarm messages have been received.
Alarm messages have been received which have not been
acknowledged.
OP27, OP37 Equipment Manual
Release 05/99