Operating Special Screen Objects
5-6
MP270 Equipment Manual
Release 01/99
Deleting messages
All message events concerning event and alarm messages are automatically
stored in the message buffer. There are two methods of deleting messages from
the buffer:
Automatic deletion on buffer overflow
When the message buffer is no longer capable of accepting new message
events, the MP270 automatically deletes a number of message events until the
configured remaining buffer capacity is reached. In this case, the oldest
messages are deleted first.
Deletion by operating the MP270
In order that messages can be deleted manually from the message buffer, the
function
Clear_message_buffer
must be available in the configuration. In this
way, the following message categories can be selected for deletion according to
the configuration:
– All messages
– Alarm messages
– Event messages
– System messages
– S7 diagnostics messages
5.2.1 Message Line
Purpose
When a message line has been configured it is always displayed, regardless of the
screen selected. Only the latest message is displayed in the message line.
If display type
line/line
is configured, the message line displays an event or alarm
message. In order to differentiate between them, alarm messages flash in the
display.
If display type
window/line
is configured, the message line displays an event
message. Alarm messages are displayed via a window which opens up.
Display priorities
Alarm messages always have priority over event messages. If no alarm messages
are present or they have all been acknowledged, event messages are displayed.
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