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CHAPTER6 FUNCTIONS
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6.17 Self-diagnostic Function
6 - 103
: Self-diagnostics is performed. : Self-diagnostics is not performed
*1: The operating status can be changed to "Continue" with the parameter setting of GX Developer The 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)
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.
Program
error
SFC syntax
error
SFCP. FORMAT
ERR.
• Switching from
STOP to RUN
Stop
Off
Flashi
ng
SFC block
execution error
BLOCK
EXE.ERROR
• Execution of an
instruction
Stop
Off
Flashi
ng
SFC step
execution error
STEP
EXE.ERROR
• Execution of an
instruction
Stop
Off
Flashi
ng
CPU
error
Watchdog error
supervision
WDT ERROR
• Always Stop
Off
Flashi
ng
Program time-
out
PRG.TIME OVER
• Always
Continue On On
Multiple
CPU
system
s error
Another CPU
major error
MULTI CPU
DOWN
• Always
• Power-on/reset
Stop
Off
Flashi
ng
Multiple CPU
systems
execution error
MULTI
EXE.ERROR
• Power-on/reset Stop
Off
Flashi
ng
Multiple CPU
systems
consistency
error
CPU LAY.
ERROR
• Power-on/reset Stop
Off
Flashi
ng
Another CPU
minor error
MULTI CPU
ERROR
• Always
Continue On
On
File diagnostic check
INCORRECT
FILE
• Power-on/reset
• Switching from
STOP to RUN
• Writing to
programmable
controller
Stop
Off Off
Annunciator check F****
• Execution of an
instruction
Continue
On
USER
LED
turns
on.