Siemens simatic hmi op27 Equipment Manual page 57

Messages
Message line When a message line has been configured, it is always displayed, regardless of
the screen selected. If line/line has been configured, an event or alarm message
is displayed in the message line. Alarm messages flash to distinguish them
from event messages. If window/line has been configured, an event message is
displayed in the message line. An alarm message is displayed by means of a
window.
Display priorities:
Only configured text appears in the message line.
Message window Messages in the configured message window contain additional information on
the message, such as message number and date/time the message arrived.
Alarm message window:
The alarm message window (Figure 6-1) automatically appears whenever an
alarm message is issued. When an alarm message is acknowledged, the alarm
message window disappears if no other alarm messages are waiting.
In the case of the OP27, input is not possible while an alarm message window
is open.
6-4
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Line/line
An event message or an alarm
message is displayed on the mes-
sage line. The message line is
permanently visible. If there are
no messages waiting, the standby
message is displayed.
Alarm messages always have precedence over
event messages.
Alarm message
If no alarm messages are present, or they have all
Event message
been acknowledged, event messages are
displayed.
If there are no event messages waiting, the standby
message is displayed.
Standby message
An alarm message is acknowledged by pressing the system key
depicted on the right. The LED integrated in the system key remains on
while an unacknowledged alarm message is waiting to be displayed.
Message line
ACK
OP27, OP37 Equipment Manual
Release 05/99