8 TROUBLESHOOTING
MELSEC-Q
8 - 88 8 - 88
*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
2500
• There is a program file that uses a
device that is out of the range set in
the PLC parameter device setting.
• After the PLC parameter setting is
changed, only the parameter is
written into the PLC.
• Read the common information of the
error using the peripheral device,
check to be sure that the parameter
device allocation setting and the
program file device allocation
correspond to the numerical values
there (file name), and correct if
necessary.
• If PLC parameter device setting is
changed, batch-write the parameter
and program file into the PLC.
2501
There are multiple program files
although "none" has been set at the
PLC parameter program settings.
Edit the PLC parameter program
setting to "yes". Alternatively, delete
unneeded programs.
QnA
Qn(H)
QnPH
QnPRH
• There are three or more program
files.
• The program name differs from the
program contents.
• Delete unnecessary program files.
• Match the program name with the
program contents.
Q00J/Q00/Q01
2502
The program file is incorrect.
Alternatively, the file contents are not
those of a sequence program.
Check whether the program version
is .QPG, and check the file
contents to be sure they are for a
sequence program.
The program file is not the one for the
redundant CPU.
Create a program using GX Developer
or PX Developer for which the PLC
type has been set to the redundant
CPU (Q12PRH/Q25PRH), and write it
to the CPU module.
QnPRH
2503 There are no program files at all.
• Check program configuration.
• Check parameters and program
configuration.
2504
Two or more SFC normal programs or
control programs have been
designated.
QnA
Qn(H)
QnPH
QnPRH
There are two or more SFC programs. Reduce the SFC programs to one.
Q00J/Q00/
Q01
*12
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