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…4 CONFIGURATION MODE
Fig. 4.6 Latch Alarms
Alarm Trip
Value
PV
Alarm Off
Alarm Trip
Hysteresis
Alarm
Latched
Alarm
Acknowledgement
State
Alarm
On
High Latch Alarm
Alarm Trip
Value
PV
Alarm Trip
+ Hysteresis
Alarm
Latched
Alarm
Acknowledgement
State
Alarm On
Low Latch Alarm
Alarm
Off
Information
High/Low Latch Alarms – An alarm becomes active when the process
variable value rises above the high latch alarm trip point value or falls
below the low latch alarm trip point value. The latch alarm trip point
values are configured in engineering units in the Set Up Level (Level 2).
The alarm remains active until it is acknowledged and the alarm process
condition is removed. The alarm can be acknowledged using the keys
on the instrument front panel (see page 3) or via the volt-free digital input
once it has been configured to provide a remote alarm acknowledge
facility.
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