<4. Self-Diagnostics>
4-2
IM 01C50T03-02EN
Table 4.1
Alarm List
Indicator
display
BRAIN configuration
tool display
Cause
Output operation
upon error
Action
AL.00
CPU Failure
The main CPU has failed.
Data output and
communication do not
occur if the transmitter
has failed.
Device Replacement
AL.01
Snsr NV Failure
CRC mismatching of the
sensor's non-volatile memory
has occurred, or normal data
wiring has failed.
Data output and
communication
are permitted if the
transmitter has failed.
AL.02
Temp NV Failure
CRC mismatching of TEMP
ASSY non-volatile memory has
occurred, or Write/Read Verify
mismatching has occurred.
(System cannot start up
normally.)
AL.03
AD Conv Failure
Hardware failure at input side
AL.04
Main R-Calc Fail
Mismatching of MAIN ASSY
CPU inverse computation has
occurred.
AL.05
Temp R-Calc Fail
Mismatching of TEMP ASSY
CPU inverse computation has
occurred.
AL.06
Temp Volt Fail
Abnormal TEMP ASSY power
voltage
AL.07
Comm NV Fail
CRC mismatching of
communication non-volatile
memory has occurred, or
normal data wiring has failed.
AL.08
Temp NV Warning
CRC mismatching of TEMP
ASSY non-volatile memory has
occurred, or Write/Read Verify
mismatching has occurred.
(System can start up but may
fail.)
The output continues.
AL.09
Int Comm Fail
Internal communication error
The output and
communication for
sensor burnout are
permitted.
AL.10
S1 Failure
The Sensor1 input circuit is
open or disconnected from the
terminal.
See Table 4.2.
• Check the
soundness of the
temperature sensor.
• Check the sensor
connection.
AL.11
S2 Failure
The Sensor2 input circuit is
open or disconnected from the
terminal.
AL.12
S1 Short
Sensor1 has shorted.
AL.13
S2 Short
Sensor2 has shorted.
AL.14
S1 Corrosion
Sensor1 has corroded.
Normal operation
Check the sensors,
terminals, and cables.
AL.15
S2 Corrosion
Sensor2 has corroded.
Normal operation
AL.20
S1 Signal Error
The Sensor1 input has error
Normal operation
• Check the
soundness of the
temperature sensor.
• Check the sensor
type.
AL.21
S2 Signal Error
The Sensor2 input has error
Normal operation
AL.22
Term Sensor Fail
The terminal block temperature
is abnormal. The terminal block
temperature sensor has failed,
or its circuit is open.
See Table 4.2.
Device Replacement