Mitsubishi Electric QJ71LP21 Reference Manual page 295

8 TROUBLESHOOTING
Error Code
Error Contents and Cause
*1
(SD0)
• The other system did not respond during initial
communication at power ON/reset.
6140
• The error occurred at a startup since the redundant
system startup procedure was not followed.
The standby system in a redundant system is switched to
the control system.
The standby system has been switched to the control
system in a redundant system. (Detected by the CPU that
was switched from the standby system to the control
system)
6200
Since this error code does not indicate the error
information of the CPU module but indicates its status, the
error code and error information are not stored into SD0
to 26, but are stored into the error log every system
switching.
(Check the error information by reading the error log using
GX Developer.)
The control system in a redundant system is switched to
the standby system.
The control system has been switched to the standby
system in a redundant system. (Detected by the CPU that
was switched from the control system to the standby
system)
6210
Since this error code does not indicate the error
information of the CPU module but indicates its status, the
error code and error information are not stored into SD0
to 26, but are stored into the error log every system
switching.
(Check the error information by reading the error log using
GX Developer.)
• Since the standby system is in an error or similar status
in the redundant system, the control system cannot be
switched to the standby system.
• When an attempt was made to execute system
switching, the control system could not be switched to
the standby system due to a network error of the control
system.
6220
System switching cannot be executed as the standby
system or tracking cable is faulty in a redundant system.
The following shows the reasons for system switching on
the control system.
• System switching by SP. CONTSW instruction
• System switching request from network module
Switching is disabled because of a bus switching module
6221
error.
The link module mounted on the standby type CPU is the
6230
remote master station.
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being stored.
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Corrective Action
• Power the corresponding CPU module OFF and then
ON again, or reset it and then unreset. If the same error
still occurs, this indicates the CPU module is faulty.
(Contact your local Mitsubishi representative,
explaining a detailed description of the problem.)
• Confirm the redundant system startup procedure, and
execute a startup again.
Check the control system condition.
----
Check the control system condition.
----
Check the standby system condition.
Check the status of the standby system and resolve the
error.
This is a bus switching module hardware fault. (Contact
your nearest Mitsubishi representative.)
Check the system configuration status.
MELSEC-Q
Corresponding CPU
QnPRH
Q4AR
QnPRH
Q4AR
QnPRH
Q4AR
QnPRH
Q4AR
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