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Diagnostics
Error message
SFC syntax
SFCP. FORMAT
error
ERR.
SFC block
Program
BLOCK
error
execution error
EXE.ERROR
SFC step
STEP
EXE.ERROR
execution error
Watchdog error
WDT ERROR
supervision
CPU
error
Program time-
PRG.TIME OVER
out
Another CPU
MULTI CPU
major error
DOWN
Multiple CPU
MULTI
systems
Multiple
EXE.ERROR
execution error
CPU
Multiple CPU
system
systems
CPU LAY.
s error
consistency
ERROR
error
Another CPU
MULTI CPU
minor error
ERROR
INCORRECT
File diagnostic check
FILE
Annunciator check
F****
*1: The operating status can be changed to "Continue" with the parameter setting of GX DeveloperÅiThe default is set to "Stop").
*2:This option can be set "not checked" (set "checked" by default) with the parameter setting of GX Developer. Also, this option is not checked
while SM251 is on.
*3: This option can be set "not checked" (set "checked" by default) with the parameter setting of GX Developer.
*4: This error includes an operation error when device range check is made at index modification.
*5: The CPU module having the serial number (first five digits) is "10042" or later can be diagnosed.
Table6.29 Self-diagnostics list (continued)
CPU
Diagnostic timing
module
RUN
status
• Switching from
Stop
STOP to RUN
• Execution of an
Stop
instruction
• Execution of an
Stop
instruction
• Always
Stop
• Always
Continue
• Always
Stop
• Power-on/reset
• Power-on/reset
Stop
• Power-on/reset
Stop
• Always
Continue
• Power-on/reset
• Switching from
STOP to RUN
Stop
• Writing to
programmable
controller
• Execution of an
Continue
instruction
LED status
Q00U
Q00UJ
CPU,
Q02U
CPU
Q01U
CPU
ERR.
CPU
Flashi
Off
ng
Flashi
Off
ng
Flashi
Off
ng
Flashi
Off
ng
On
On
Flashi
Off
ng
Flashi
Off
ng
Flashi
Off
ng
On
On
Off
Off
USER
On
LED
turns
on.
:
:
Self-diagnostics is performed.
CHAPTER6 FUNCTIONS
Built-in
QnUD(H)
Ethernet
CPU
port
QCPU
Self-diagnostics is not performed
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