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.