<4. Diagnostics >
4-3
IM 01C50T01-02EN
Indicator
HART display
Cause
Output operation during
alarm
Action
AL.25
Sensor Drift
Sensor drift
Continue to operate and
output
Check sensor for
damage.
AL.26
*1
Sensor1 Temp Cycle
Temperature cycling times
of Sensor1 exceeds the
threshold
Reset temp cycle of
sensor1.
AL.27
*1
Sensor2 Temp Cycle
Temperature cycling times
of Sensor2 exceeds the
threshold.
Reset temp cycle of
sensor2.
AL.30
Output Too Low
PV value is below the range
limit setting.
Lower limit 3.68mA (-2%)
Check the LRV
setting and adjust.
AL.31
Output Too High
PV value is above the range
limit setting.
Upper limit 20.8mA (105%)
Check the URV
setting and adjust.
AL.40
Sensor1 Temp Low
Measured temperature of
sensor 1 is to low.
Continue to operate and
output
Check sensor type
selected.
AL.41
Sensor1 Temp High
Measured temperature of
sensor 1 is to high.
AL.42
Sensor2 Temp Low
Measured temperature of
sensor 2 is to low.
AL.43
Sensor2 Temp High
Measured temperature of
sensor 2 is to high.
AL.44
Amb Temp Low
Ambient temperature is
below-40 degree C.
Use a heater to
raise the ambient
temperature, or reset
to a higher level.
AL.45
Amb Temp High
Ambient temperature is
above 85 degree C.
Take enough distance
from the source of
heat, or reset to a
lower level.
AL.50
LRV Too Low
LRV setting is below
the sensor operating
temperature range.
Check the LRV
setting.
AL.51
LRV Too High
LRV setting is above
the sensor operating
temperature range.
AL.52
URV Too Low
Setting the URV is below
the sensor operating
temperature range.
Check the URV
setting.
AL.53
URV Too High
Setting the URV is above
the sensor operating
temperature range.
AL.54
Span Too Small
Span is below the
recommended minimum
span.
Check the LRV and
URV setting.
AL.60
Illegal PV Cfg
There is a setting alarm in
the sensor that is mapped to
the PV
Hold the output of the
previous alarm
When it occurs at startup,
hold at 4mA
Check the PV
mapping.
AL.61
Illegal Sensor1 Cfg
There is a false set to
sensor1.
Continue to operate and
output
Check the sensor1
setting.
AL.62
Illegal Sensor2 Cfg
There is a false set to
sensor2.
Check the sensor2
setting.
AL.70
Output Manual Mode
Under loop test mode
Setting value of loop test
Check loop test
mode.
*1:
Applicable only for YTA710.
*2: In software revision R1.03.01 or earlier, AL04 may be generated even when abnormality or disconnection of the terminal block
temperature sensor occurs.
*3: In software revision R1.03.01 or earlier, Even if abnormality or disconnection of the terminal block temperature sensor occurs,
AL22 may not be output and AL04 may be generated.
