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CHAPTER 3 FUNCTIONS
3
3.17 Self-diagnostic Function
(6) 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.
: Self-diagnostics is performed. × : Self-diagnostics is not performed.
Diagnostics
Error
message
Diagnostic
timing
CPU
module
status
LED status
Q00UJ
CPU
Q00U
CPU,
Q01U
CPU
Q02U
CPU
QnUD
(E)(H)
CPU
QnUDV
CPU,
QnUDP
VCPU
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
Operation circuit
check
OPE.CIRCUIT
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
LAN
controller
failure
LAN CTRL.
DOWN
• Power-on/reset Stop Off Flashing × × ×
*4
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
Multiple CPU high
speed bus error
MULTI-C.BUS
ERR.
• Power-on/reset Stop Off Flashing × × ×
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