ScreenMaster RVG200
Paperless recorder 7 Configuration
98 OI/RVG200-EN
Fig. 7.15 Delayed high / low process alarms
Alarm off
Alarm on
Alarm enabled
Alarm disabled
Trip point
Hysteresis
Process
variable
Delay time
Process variable goes above trip
point but alarm is not activated
because enable signal is low
(Alarm Disable).
Process variable goes above
trip point but alarm is not
activated because alarm
delay time has not expired.
Process variable goes
below trip (hysteresis)
point therefore alarm is
de-activated.
Process variable goes above
trip point, alarm is activated
(alarm is enabled and delay
time has expired).
Alarm enable signal is
switched on. Alarm delay
timer is started
Alarm delay timer expires, alarm
is now enabled. Alarm is
activated because process
variable is above trip point.
Alarm enable signal is
switched off. Alarm is
disabled immediately.
Alarm de-activates.
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