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6.17 Self-diagnostics Function
6
FUNCTIONS
(7) Self-diagnostics list
Table6.35 lists the self-diagnostics performed in the CPU module.
The error messages in the "Error message" column can be checked on the screen
displayed by selecting [Diagnostics] [PLC diagnostics] in GX Developer.
The numbers in the "CPU module" column correspond to the CPU modules as
indicated in Table6.34.
: Self-diagnostics is performed, : Self-diagnostics is not performed
(Continued on next page)
Table6.34 Number in the "CPU module" column and corresponding CPU module
No. CPU module
1) Basic model QCPU
2) High Performance model QCPU
3) Process CPU
4) Redundant CPU
5) Universal model QCPU
Table6.35 Self-diagnostics list
Diagnostics Error message Diagnostics timing
CPU
module
status
LED status CPU module
RUN ERR. 1) 2) 3) 4) 5)
Hardware
failure
CPU error
MAIN CPU
DOWN
• Always Stop OFF Flash
END instruction not
executed
END NOT
EXECUTE
• When the END
instruction is
executed
Stop OFF Flash
SFC program
execution error
SFCP. END
ERROR
• When SFC
program is
executed
Stop OFF Flash
RAM check RAM ERROR
• When the CPU
module is
powered on/reset
Stop OFF Flash
Tracking memory or
tracking hardware
fault
TRK. CIR.
ERROR
• When the CPU
module is
powered on/reset
• When operation is
being performed
Stop OFF Flash
Calculation circuit
check
OPE.CIRCUIT
ERR.
• When the CPU
module is
powered on/reset
• When END
processing is
executed
Stop OFF Flash
Fuse blown
*1*2
FUSE BREAK
OFF
•Always
Stop/
Continue
OFF/ON Flash/ON
I/O interrupt error I/O INT. ERROR
• When an interrupt
occurs
Stop OFF Flash
LAN controller error
LAN CTRL.
DOWN
• When the CPU
module is
powered on/reset
Stop OFF Flash
*8
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