6. Troubleshooting
C40D Use I / P incorrectly
C40E
IRET doesn’t follow by the last FEND instruction
SRET doesn’t follow by the last FEND instruction
C40F
PLC program and data in parameters have not been
initialized
C41B Invalid RUN/STOP instruction to extension module
C41C
The number of input/output points of I/O extension unit is
larger than the specified limit
C41D
Number of extension modules exceeds the range
C41F
Failing to write data into memory
C440
Hardware error in high-speed counter
Hardware error in high-speed comparator
C442
Hardware error in MCU pulse output
C443
No response from extension unit
C450
The analog-to-digital/digital-to-analog function of the MCU
fails.
C4EE No END command in the program
C4FF Invalid instruction (no such instruction existing)
C430 Error occurs while the left-side module is being initialized
is connected
securely? If there is
any abnormality on
the connection? If
none of the above,
replace with a new
C437
Error occurs while checking the memory of the left-side
module
C438
Error occurs while checking the model code of the
left-side module
C41C
The
number of the extended X and Y points detected has
exceed the supported quantity.
number of the X and
Y points of the
extension DIO
module is within the
C421
The PLC identification code is not matched, w
the backup file from the
memory card to restore the PLC
program.
identification code in
the backup file is the
same as the PLC
C422
The PLC password is not matched, when using the
file from the memory card to restore the PLC program.
password in the
backup file is the
same as the PLC
C425
The checksum or the PLC program syntax is not matched,
when using the backup file from the memory card to
restore the PLC program.
backup file of the
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