405.1200.037.2 - Rel.: 2.21 of 25/02/2008
36-27
• Event in and not acknowledged [
]
• Event in, present and acknowledged [
]
• Event out and not acknowledged. [
]
Example with five alarms:
When you press
you select the second alarm as the current alarm. 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 appropriate
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 highlighted by the appropri-
ate alarm status symbol.
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 first page of the alarm, you
press
, or at any point
you enter display mode, signaled by the fixed light LED of that coming
on.
When you press
again you enter the second page whose format is set
out below (valid only for VT170W and VT190W).
Water level is lower than
stop threshold of the process
10
>01-07-1998 11:32a <01-07-1998 11:37a
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
First
alarm
Second
alarm
Third
alarm
0001
0032
0006
PgDn
Enter
Others
VT320W
Alarm
Alarm
Hist
Shift
+
VT160W
VT150W
VT60
VT50
Shift
+
VT130W
H e lp
H ist
S h ift
+
Alarm
Summary of Contents for VT130W
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