6-5
OP27,
OP37 Equipment Manual
Release 05/99
0000048 11:34:02 27.03.97 QGR 01 2
Boiler 25: Temperature 156 degrees
Summon Shift Engineer. Tel.: 9456
Message
number
Date
Time
Acknowledgment group
Number of unacknowledged
messages
Process value
Figure 6-1 Alarm message window (example)
Event
message window
:
The event message window must be selected and then deselected by the opera
-
tor
. If an event message is not currently waiting, the standby message is dis
-
played.
Activate the event message window by pressing the function key
assigned to the icon depicted on the right in the
Message Pr
ocess-
ing
standard screen.
Close the event message window by pressing this function key a second time.
Alarm and event messages are written in the OP message archive when they
arrive. The message archive is a buf
fer in which all message events are entered
in chronological order
. Message events consist of:
arrival of a message
acknowledgment of an alarm message
departure of a message.
The message archive is implemented as a FIFO buf
fer
. When the buf
fer is full,
the oldest messages are deleted.
During configuration, it is possible to define a remainder buf
fer size for the
message archive. As soon as this remaining buf
fer capacity is reached, the OP
automatically issues an overflow warning (system message). Messages con
-
tinue to be entered in the message archive even after the remaining buf
fer
capacity has been reached.
If the conditions for issuing a message have been fulfilled in the process cur
-
rently running, e.g. a value has been reached, a bit is set in the data area by the
PLC application program for an event or alarm message. The OP reads the data
area after a configured polling time. In this way
, a message is detected as hav
-
ing “arrived”. The bit is reset by the PLC when the condition for issuing the
message no longer exists. The message is then regarded as having “departed”.
Message
archive
Overflow warning
Message bit
procedure
Messages
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