8 TROUBLESHOOTING
MELSEC-Q
8 - 126 8 - 126
*1 : Characters in parentheses ( ) indicate the special register numbers where individual information is being
stored.
*12: This applies to the CPU module of function version B or later.
Error
Code
(SD0)
*1
Error Contents and Cause Corrective Action
Corresponding
CPU
4610
The active step information at
presumptive start of an SFC program
is incorrect.
Read common information of the error
using the peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
The program is automatically
subjected to an initial start.
QnA
Qn(H)
QnPH
QnPRH
4611
Key-switch was reset during RUN
when presumptive start was
designated for SFC program.
4620
Startup was executed at a block in the
SFC program that was already started
up.
Read common information of the error
using the peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
4621
Startup was attempted at a block that
does not exist in the SFC program.
• Read the common information of the
error using GX Developer, and
check and correct the error step
corresponding to that value
(program error location).
• Turn SM321 ON if it is OFF.
QnA
Q00J/Q00/
Q01
*12
Qn(H)
QnPH
QnPRH
4630
Startup was executed at a block in the
SFC program that was already started
up.
Read common information of the error
using the peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
QnA
Qn(H)
QnPH
QnPRH
4631
• Startup was attempted at the step
that does not exist in the SFC
program.
Or, the step that does not exist in the
SFC program was specified for end.
• Forced transition was executed
based on the transition condition
that does not exit in the SFC
program.
Or, the transition condition for forced
transition that does not exit in the
SFC program was canceled.
• Read the common information of the
error using GX Developer, and
check and correct the error step
corresponding to that value
(program error location).
• Turn SM321 ON if it is OFF.
QnA
Q00J/Q00/
Q01
*12
Qn(H)
QnPH
QnPRH
4632
There were too many simultaneous
active steps in blocks that can be
designated by the SFC program.
Read common information of the error
using the peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
QnA
Qn(H)
QnPH
QnPRH
4633
There were too many simultaneous
active steps in all blocks that can be
designated.
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