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MELSEC-Q
8 TROUBLESHOOTING
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*9 : **** indicates the detected annunciator No.
*10: ***_*** indicates the detected contact and coil No.
*11 : For the Basic model QCPU, it can be turned off by the LED indication priority setting special register
(SD207 to SD209). (Only turned off for the High Performance model QCPU, Process CPU or Redundant
CPU.)
Error
Code
(SD0)
*1
Error
Messages
Common
Information
(SD5 to 15)
Individual
Information
(SD16 to 26)
LED Status Operating
Statuses
of CPU
Diagnostic
Timing
RUN ERROR
9000 F****
*9
Program error
location
Annunciator
number
On
On/
Off
*11
Continue
When
instruction
executed.
USER LED On
9010
<CHK>ERR
***-***
*10
Program error
location
Failure No.
On Off
Continue
When
instruction
executed.
USER LED On
9020 BOOT OK ---- ---- Off Flicker Stop
At power ON/
At reset
10000
CONT. UNIT
ERROR
---- ---- Off Flicker Continue Always
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