Mitsubishi QJ71LP21-25 - Page 354

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MELSEC-Q
8 TROUBLESHOOTING
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*4 : This can only be detected in the redundant system control system.
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
6220
CAN'T EXE.
CHANGE
*4
Reason(s) for
system
switching
---- On On Continue
At switching
request
CAN'T
SWITCH
Reason(s) for
system
switching
Reason(s) for
system
switching
failure
On On Continue
At switching
execution
6221
CAN'T EXE.
CHANGE
*4
Reason(s) for
system
switching
---- On On Continue
At switching
request
6230
DUAL SYS.
ERROR
---- ---- On On Continue Always