ABB DATUM L160 User Manual page 26

...4 CONFIGURATION MODE
PV
Alarm
On
PV
Alarm On
Information
High/Low Latch Alarms
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.
24
Alarm
Latched
High Latch Alarm
Alarm
Latched
Low Latch Alarm
– An alarm becomes active when the process
Fig. 4.6 Latch Alarms
Alarm Trip
Alarm Trip
Hysteresis
Alarm Off
Acknowledgement
Alarm Trip
+ Hysteresis
Alarm Trip
Alarm
Off
Alarm
Acknowledgement
State
Value
Alarm
State
Value