DataLoop™ LI23 Loop-Powered Process Meter
Instruction Manual
MN302100 Rev 3
27
Alarm (
ALARM
)
Alarm outputs may be assigned to the PV or the digital input. When assigned to the PV, the alarm may be
set as either a high alarm or a low alarm. Alarm actions (
AUTO
,
AUTO.MAN
,
LATCH
,
L‐CLEAR
) determine
how and when the alarm should be reset. They operate as follows:
Automatic (
AUTO
):
Alarm will reset automatically once the alarm condition has cleared.
Automatic/Manual (
AUTO.MAN
):
Alarm will reset automatically once the alarm condition has
cleared but can also be reset using the
Enter
(ACK) button (or whichever function key is set to
acknowledge)
at any time.
Latching (
LATCH
):
Alarm must be reset manually and can be done so at any time. Press the
Enter
(ACK) button at any time to clear the alarm.
Latching with Reset after Clear (
L‐CLEAR
):
Alarm must be reset manually and can only be done
so after the alarm condition has cleared. Press the
Enter
(ACK) button after the alarm condition
has cleared to reset the alarm.
If the alarm is set to PV, a set and reset point must be programmed. The set point is the display value at
which the alarm will turn on and the reset point is the display value at which the alarm will turn off. If the
set point is lower than the reset point, the alarm will be a low alarm; if the set point is higher than the reset
point, the alarm will be a high alarm. The digital input alarm will trigger whenever the digital input is trig-
gered.
For both the PV and digital input alarms, a delay before the alarm is turned on or off may be set, as well
as a failsafe feature which will inverse the on/off programming.
Alarm states will be displayed on the meter even if no open collector output is physically connected. The
alarm indicator (!) will display as well as optional red LED backlight, flashing PV value (PV alarm only),
and a programmable alarm message.
OUT 1
ALARM
ALARM
PV
ALARM
D.INPUT
ALARM
ACTION
ACTN
AUTO
ACTN
AUTO.MAN
ACTN
LATCH
ACTN
L-CLEAR
SET
+00,040.00
SET
GAL
Flashes
Units
ALARM
RESET
ALARM
SET
RESET
+00,030.00
ALARM
DELAY
DELAY
ON
TIME
0000 SEC
DELAY
OFF
TIME
0000 SEC
ALARM
FAILSAFE
PV Alarm Only
FSAFE
OFF
ALARM
DISPLAY
RED
ON
FLASH
ON
PV Alarm Only
MSG
ON
MSG
ALARM 1
