8 TROUBLESHOOTING
MELSEC-Q
8 - 110 8 - 110
*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
4000
• The program contains an instruction
code that cannot be decoded.
• An unusable instruction is included
in the program.
Read the common information of the
error using a peripheral device, check
error step corresponding to its
numerical value (program error
location), and correct the problem.
4001
The program contains a dedicated
instruction for SFC although it is not an
SFC program.
QnA
Q00J/Q00/
Q01
*12
Qn(H)
QnPH
QnPRH
4002
• The extension instruction
designated by the program has an
incorrect instruction name.
• The extension instruction specified
in the program cannot be executed
by the specified module.
Rem
4003
The extension instruction designated
by the program has an incorrect
number of devices.
4004
The extension instruction designated
by the program a device which cannot
be used.
4010
There is no END (FEND) instruction in
the program.
4020
The total number of internal file
pointers used by the program exceeds
the number of internal file pointers set
in the parameters.
QnA
Qn(H)
QnPH
QnPRH
4021
• The common pointer Nos. assigned
to files overlap.
• The local pointer Nos. assigned to
files overlap.
4030
The allocation pointer Nos. assigned
by files overlap.
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