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8.7 Alarm Code List
The following table lists alarm codes.
The alarm code is stored in all bits of Write data error code (Un\G0).
If the lower 4 bits are "0001" (1
H
) to "1001" (9
H
) or "1011" (B
H
) to "1111" (F
H
), an error occurs. When an error occurs,
refer to the error code list ( Page 367, Section 8.6).
Alarm code
(hexadecimal)
*1
Cause Operation at alarm occurrence Action
01A
H
The temperature process
value (PV) has exceeded the
temperature measurement
range that was set as the input
range.
• The ALM LED flashes.
•CH Alert occurrence flag (XnC to XnF)
turns on.
•CH Input range upper limit (b0 of Un\G5 to
Un\G8) turns on.
When Error reset instruction (Yn2) is
turned OFF ON OFF after the
temperature process value (PV) has
returned to the value within the
temperature measurement range,
Write data error code (Un\G0) is
cleared to 0.
The following flags and buffer
memory bits that turn on when an
alarm occurs turn off automatically
when the temperature process value
(PV) has returned to the value within
the temperature measurement range.
•CH Alert occurrence flag (XnC to
XnF)
• The applicable bit ( Page 87,
Section 3.4.2 (3)) of CH Alert
definition (Un\G5 to Un\G8)
02A
H
The temperature process
value (PV) is below the
temperature measurement
range that was set as the input
range.
• The ALM LED flashes.
•CH Alert occurrence flag (XnC to XnF)
turns on.
•CH Input range lower limit (b1 of Un\G5 to
Un\G8) turns on.
03A
H
A loop disconnection has been
detected.
• The ALM LED flashes.
•CH Alert occurrence flag (XnC to XnF)
turns on.
•CH Loop disconnection detection (b13 of
Un\G5 to Un\G8) turns on.
When Error reset instruction (Yn2) is
turned OFF ON OFF after a
current error due to a disconnection
or output-off is restored, Write data
error code (Un\G0) is cleared to 0.
The following flags and buffer
memory bits that turn on when an
alarm occurs turn off automatically
when the current error due to
disconnection or output-off is
restored.
•CH Alert occurrence flag (XnC to
XnF)
• The applicable bit ( Page 87,
Section 3.4.2 (3)) of CH Alert
definition (Un\G5 to Un\G8)
04A
H
A heater disconnection has
been detected.
• The HBA LED turns on.
•CH Alert occurrence flag (XnC to XnF)
turns on.
•CH Heater disconnection detection (b12
of Un\G5 to Un\G8) turns on.
05A
H
A current error at an output
off-time has been detected.
• The HBA LED turns on.
•CH Alert occurrence flag (XnC to XnF)
turns on.
•CH Output off-time current error (b14 of
Un\G5 to Un\G8) turns on.
Alarm types Alarm occurrence
channels (1 to 4
H)
An error code is
stored to AH when
an alarm occurs
to to to to
H
b15 b12 b11 b8 b7 b4 b3 b0
A