Mitsubishi Electric MELSEC-Q Series User Manual page 134

Error
Error
Code
Massage
(D9008)
"WDT
ERROR"
22
(Checked at
execution of
END
processing.)
"END NOT
EXECUTE"
24
(Checked at
execution of
the END
instruction.)
"MAIN CPU
26
DOWN"
Table 6.1 Error Code List (Continue)
Detailed
Error CPU
Code States
(D9091)
Scan time is longer than
the WDT time.
(1) Scan time of the
— STOP
(2) Scan time has
Whole program of
specified program
capacity was executed
without executing the
END
(1) When the
241 STOP
(2) The
The main CPU is
— STOP
malfunctioning or faulty.
100
Error and Cause
user's program has
been extended due
to certain
conditions.
been extended due
to momentary
power failure
occurred during
scanning.
instructions.
END
instruction was to
be executed, the
instruction was
read as other
instruction code
due to noise.
instruction
END
changed to other
instruction code
due to unknown
cause.
Corrective Action
(1) Check the scan time
of the user's
program and shorten
it using the
CJ
instructions.
(2) Monitor contents of
special register
D9005 using a
peripheral device. If
the contents are
other than 0, power
supply voltage may
not be stable. Check
power supply and
reduce variation in
voltage.
(1) Reset and run the
CPU again. If the
same error recurs,
Since this is CPU
hardware error,
consult Mitsubishi
representative.
Since this is CPU
hardware error, consult
Mitsubishi
representative.