30
Chapter 8
ALARM CODES
When an error occurs, the following alarm codes are displayed in the upper display:
Alarm code
Error
Cause
Countermeasure
A
L
0
1
A
L
0
2
A
L
0
3
A
L
7
0
A
L
9
7
A
L
9
8
Sensor line break, incorrect wiring,
incorrect range code setting
Sensor line break, incorrect wiring,
incorrect range code setting
Terminal temperature compensation
unit failure (thermocouple)
Sensor line break, incorrect wiring
(RTD)
Defective A/D converter
• Power turned OFF during fixing of
data
• Data corrupted due to noise
Data corrupted due to noise
Check wiring or reset range
code.
Check wiring or reset range
code.
Replace unit.
Check wiring.
Replace unit.
Reset data.
Replace unit.
Abnormal PV input
(see Note)
Abnormal PV input
(see Note)
CJ failure
Abnormal PV input
(see Note)
Abnormal A/D
conversion
Abnormal parameter
Abnormal adjustment
data
An alarm code other than
A
L
9
7
causes the manipulated variable (control output value)
to be set to 0% (OFF). Instrument operations other than manipulated variable are unaf-
fected.
The
A
L
9
7
alarm code does not affect instrument operation.
(Note)
• Display and operation when thermocouple input line break occurs
Abnormal State
Indication
Alarm Code
Sensor line break
Upscaled
A
L
0
1
• Display and operation when break occurs in resistance temperature detector in-
put
Abnormal State
Indication
Alarm Code
Resistor line break
Upscaled or downscaled
A
L
0
1
Break in line A
or
A
L
0
2
,
A
L
0
3
Break in line B
Downscaled
A
L
0
2
,
A
L
0
3
Break in line C
Upscaled or downscaled
A
L
0
1
,
A
L
0
3
Break in 2 lines or more
or
A
L
0
2
,
A
L
0
3
B short-circuited
Downscaled
A
L
0
2
C short-circuited
Downscaled
A
L
0
2
• Display and operation when break occurs in DC voltage input
Abnormal State
Indication
Alarm Code
Line break
Upscaled
A
L
0
1
