ScreenMaster RVG200
Paperless recorder
7 Configuration
98
OI/RVG200-EN
Fig. 7.15 Delayed high / low process alarms
Alarm
of
f
Alarm
on
Alarm
enabled
Alarm
disabled
T
rip
point
Hyster
esis
Pr
ocess
variable
Delay
time
Pr
ocess
variable
goes
above
trip
point
but
alarm
is
not
activated
because
enable
signal
is
low
(Alarm
Disable).
Pr
ocess
variable
goes
above
trip
point
but
alarm
is
not
activated
because
alarm
delay
time
has
not
expir
ed.
Pr
ocess
variable
goes
below
trip
(hyster
esis)
point
ther
efor
e
alarm
is
de-activated.
Pr
ocess
variable
goes
above
trip
point,
alarm
is
activated
(alarm
is
enabled
and
delay
time
has
expir
ed).
Alarm
enable
signal
is
switched
on.
Alarm
delay
timer
is
started
Alarm
delay
timer
expir
es,
alarm
is
now
enabled.
Alarm
is
activated
because
pr
ocess
variable
is
above
trip
point.
Alarm
enable
signal
is
switched
of
f.
Alarm
is
disabled
immediately
.
Alarm
de-activates.