Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 199

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Self-diagnostics list
The following table lists the self-diagnostics performed by the CPU module. The error messages in the "Error
message" column can be checked on the screen displayed by selecting [Diagnostics] [PLC Diagnostics] in the
programming tool.
Diagnostics
message
MAIN CPU
error
CPU
DOWN
END instruction END NOT
not executed EXECUTE
SFC program SFCP. END
execution error ERROR
check
RAM RAM ERROR
Operation circuit OPE.CIRCUIT
check ERR.
FUSE BREAK
*1 *2
Fuse blown
OFF
I/O INT.
I/O interrupt error
ERROR
controller
LAN
LAN CTRL.
failure DOWN
Hardware Intelligent
SP.UNIT
failure function module
DOWN
1
error*
CONTROL-
Control bus error
BUS ERR.
Momentary power
AC/DC DOWN
failure
Multiple CPU high MULTI-C.BUS
speed bus error ERR.
Error Diagnostic
module
timing
status
• Always
• Execution of the
END instruction
• Execution of a
SFC program
• Power-on/reset
• Power-on/reset
• Execution of the
END instruction
• Always
continue
• Occurrence of
an interrupt
• Power-on/reset
• Power-on/reset
• Execution of the
FROM/TO
instructions
• Execution of the
Stop
intelligent
continue
function module
dedicated
instruction
• Execution of the
END instruction
• Power-on
• Execution of
END
processing
• Execution of the
FROM/TO
instructions
• Execution of the
intelligent
function module
dedicated
instruction
• Always
• Always Continue
• Power-on/reset
: Self-diagnostics is performed. × : Self-diagnostics is not performed.
LED status
CPU
Q00UJ
CPU
RUN ERR.
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop Off Flashing
Stop/ Flashing
Off/on
/on
Stop Off Flashing
Stop Off Flashing ×
/ Flashing
Off/on
/on
Stop Off Flashing
On Off
Stop Off Flashing ×
CHAPTER 3 FUNCTIONS
Q00U QnUDV
QnUD
CPU, Q02U CPU,
(E)(H)
Q01U CPU QnUDP
CPU
CPU VCPU
× × *4
× ×
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