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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 Table6.27, select [Diagnostics]
[PLC
diagnostics] of GX Developer.
: Self-diagnostics is performed, : Self-diagnostics is not performed
(To the next page)
Table6.27 Self-diagnostics list
Diagnostics
Error
message
Diagnostic timing
CPU
module
status
LED status Basic
model
QCPU
High
Performance
model QCPU
Process
CPU
Redundant
CPU
RUN ERR.
Hardware
failure
CPU error
MAIN CPU
DOWN
• Always Stop Off Flashing
END
instruction
not executed
END NOT
EXECUTE
• Execution of the END
instruction
Stop Off Flashing
SFC program
execution
error
SFCP. END
ERROR
• Execution of a SFC
program
Stop Off Flashing
RAM check
RAM
ERROR
• Power-on/reset Stop Off Flashing
Tracking
memory and
tracking
hardware
error
TRK. CIR.
ERROR
• Power-on/reset
• During operation
Stop Off Flashing
Operation
circuit check
OPE.CIR-
CUIT ERR.
• Power-on/reset
• Execution of the END
instruction
Stop Off Flashing
Fuse blown
*1 *2
FUSE
BREAK
OFF
• Always
Stop/
Continue
Off/
On
Flashing/
On
I/O interrupt
error
I/O INT.
ERROR
• Occurrence of an
interrupt
Stop Off Flashing
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
Flashing/
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 Flashing
Momentary
power failure
AC/DC
DOWN
•
Always Continue On Off
Voltage drop
of power
supply for
redundant
base unit
SINGLE PS.
DOWN
• Always Continue On On
*4 *4
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