Mitsubishi QJ71LP21 Reference Manual page 354

8 TROUBLESHOOTING
Error
Error
Code
Messages
*1
(SD0)
CAN'T EXE.
*4
CHANGE
6220
CAN'T
SWITCH
CAN'T EXE.
6221
*4
CHANGE
DUAL SYS.
6230
ERROR
*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.
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Common Individual
Information Information
(SD5 to 15) (SD16 to 26)
Reason(s) for
system ----
switching
Reason(s) for
Reason(s) for
system
system
switching
switching
failure
Reason(s) for
system ----
switching
---- ----
LED Status Operating
Statuses
RUN ERROR
of CPU
On On Continue
On On Continue
On On Continue
On On Continue
MELSEC-Q
Diagnostic
Timing
At switching
request
At switching
execution
At switching
request
Always
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