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Chapter 4 Applied Operations
■ Alarm Delay
Function
Parameter
4-8
●
When "alarm type" is not set to "0: no alarm function", then alarm ON/OFF
delays can be set independently.
●
Using the "alarm 1 ~ 2 ON/OFF delay" parameter (advanced function level) ,
users can set alarm delay times independently. The initial value is "0: alarm
no delay".
The following figure uses examples of absolute upper limit alarms to illustrate the
effect of delay function on alarm output.
Condition Switching Point
Example) Absolute Upper
Limit Alarm
Alarm Value
PV Value
Alarm Output
(no delay)
Alarm Output
t
T
(with delay)
11
Alarm Output
(with delay)
t
>T
21
During a delay, if an alarms ON/OFF status changes, delay will occur again
Note:
1.
During a delay, the alarm light and communication status will
also be delayed.
2.
During a delay, if an alarms ON/OFF status changes, delay
will occur again.
3.
When power is turned on, or the initial level changes to the
operation level, the ON delay will be used.
4.
When switching to the initial level, all alarm output immedi-
ately turns OFF, without using OFF delay .
5.
The alarm will not turn ON if the time that the alarm is ON is
equal to or less than the ON delay set time. Also, the alarm
will not turn OFF if the time that the alarm is OFF is equal to
or less than the OFF delay set time.
If an alarm turns OFF and then back ON during the ON delay
6.
time, the time will be remeasured from the last time the alarm
turns ON. Also, if an alarm turns ON and then back OFF
during the OFF during the OFF delay time, the time will be
remeasured from the last time the alarm turns OFF.
Symbol
alarm 1 ~ 2 hysteresis :
alh □
advanced function level
standby sequence reset:
rest
advanced function level
alarm 1 ~ 2 activate on alarm:
al □ n
advanced function level
alarm 1 ~ 2 ON delay
a □ on
advanced function level
alarm 1 ~ 2 OFF delay
a □ of
advanced function level
□ : 1, 2
T
T
1
ON Delay
OFF Delay
t
t
11
12
T
2
t
21
ON Delay
t
22
OFF Delay
Parameter: Level
Hysteresis Amount
Prevents Frequent
Switching
Explanation
alarm
alarm
alarm
alarm
alarm
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