Mitsubishi Melsec-Q Series User Manual page 421

Error
Code Error Contents and Cause
(SD0)
[STEP EXE. ERROR]
• Startup was attempted at the step that does not
exist in the SFC program.
Or, the step that does not exist in the SFC pro-
gram was specified for end.
• Forced transition was executed based on the
transition condition that does not exit in the SFC
program.
4631
Or, the transition condition for forced transition
that does not exit in the SFC program was can-
celed.
■Collateral information
• Common Information:Program error location
• Individual Information:–
■Diagnostic Timing
• When instruction executed
[STEP EXE. ERROR]
There were too many simultaneous active steps in
blocks that can be designated by the SFC program.
■Collateral information
4632
• Common Information:Program error location
• Individual Information:–
■Diagnostic Timing
• When instruction executed
[STEP EXE. ERROR]
There were too many simultaneous active steps in
all blocks that can be designated.
■Collateral information
4633
• Common Information:Program error location
• Individual Information:–
■Diagnostic Timing
• When instruction executed
*2 The function version is B or later.
Corrective Action
• Read the common information of the error using
the peripheral device, and check and correct the
error step corresponding to that value (program
error location).
• Turn ON if the special relay SM321 is OFF.
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.
CHAPTER12 TROUBLESHOOTING
LED Status Corresponding
CPU Status CPU
Q00J/Q00/Q01
Qn(H)
QnPH
QnPRH
QnU
RUN:
Off
ERR.:
Flicker
CPU Status:
Stop
Qn(H)
QnPH
QnPRH
QnU
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*2
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