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(7) Self-diagnostics list
The following table shows the self-diagnostics performed by the CPU module.
To check the error messages in the "Error message" column of Table6.29, select [Diagnostics] [PLC
diagnostics] of GX Developer.
: Self-diagnostics is performed. : Self-diagnostics is not performed.
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Table6.29 Self-diagnostics list
Diagnostics
Error message Diagnostic timing
CPU
module
status
LED status
Q00UJ
CPU
Q00U
CPU,
Q01U
CPU
Q02U
CPU
QnUD(H)
CPU
Built-in
Ethernet
port QCPU
RUN ERR.
Hardware
failure
CPU error
MAIN CPU
DOWN
• Always Stop Off
Flashi
ng
END instruction
not executed
END NOT
EXECUTE
• Execution of the
END instruction
Stop Off
Flashi
ng
SFC program
execution error
SFCP. END
ERROR
• Execution of a
SFC program
Stop Off
Flashi
ng
RAM check
RAM ERROR
• Power-on/reset Stop Off
Flashi
ng
Operation circuit
check
OPE.CIRCUIT
ERR.
• Power-on/reset
• Execution of the
END instruction
Stop Off
Flashi
ng
Fuse blown
*1 *2
FUSE BREAK
OFF
• Always
Stop/
continue
Off/on
Flashi
ng/on
I/O interrupt error
I/O INT.
ERROR
• Occurrence of an
interrupt
Stop Off
Flashi
ng
LAN controller
failure
LAN CTRL.
DOWN
• Power-on/reset Stop Off
Flashi
ng
Intelligent function
module error *
1
SP.UNIT
DOWN
• Power-on/reset
• Execution of the
FROM/TO
instructions
• Execution of the
intelligent
function module
dedicated
instruction
• Execution of the
END instruction
Stop
/
continue
Off/on
Flashi
ng
/on
Control bus error
CONTROL-
BUS ERR.
• Power-on
• Execution of
END processing
• Execution of the
FROM/TO
instructions
• Execution of the
intelligent
function module
dedicated
instruction
• Always
Stop Off
Flashi
ng
Momentary power
failure
AC/DC DOWN
• Always
Continue On
Off
Multiple CPU high
speed bus error
MULTI-C.BUS
ERR.
• Power-on/reset Stop Off
Flashi
ng