405.1200.037.2 - Rel.: 2.21 of 25/02/2008
37-31
Example with three alarms:
ISA-1A alarm
history buffer
When an event occurs to which an alarm has been assigned the terminal
registers it chronologically in an area of the internal memory called the
Alarm history buffer
. If, while displaying the alarm page, you touch the
HIST on the screen, you access the history buffer.
The VT can provide an automatic sequential display of information mes-
sages on command from the device (see
).
The buffer of the
Alarm history
can be emptied (the elimination of all the
messages registered) only by means of a command from the device (see
Once the buffer is full, new alarms are no longer registered. You
are advised to consult the chapter
Status area of the VT
38 -> Status area for the terminal“
(see also Software Manual) to be able
to tell when the buffer is full.
ESC
HELP
Water level is lower than
stop threshold of the process
10
Pressure in tank is over
safety limit
150.0
>01-07-1998 11:32a
Temperature over
safety limit
1600
>01-07-1998 12:28p #01-07-1998 12:29p
HELP
Note that the second alarm is accompanied by
the character [<] followed by the date and time,
indicating that the triggering event of the alarm
disappeared before being acknowledged. The
situation as a whole is highlighted by the appro-
priate alarm status symbol. Third alarm is
accompanied by the character [#] followed by
the date and time, indicating that the triggering
event of the alarm is present and has been
acknowledged. The situation as a whole is high-
lighted by the appropriate alarm status symbol.
First
alarm
Second
alarm
Third
alarm
>01-07-1998 11:32a <01-07-1998 11:37a
0001
0032
0006
HELP
Содержание VT130W
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