Mitsubishi MELSEC L Series User Manual page 223

Appendix 1.11
If an error occurs at communication request from a programming tool, intelligent function module, or network system,
the CPU module returns an error code to the request source.
This error code is not stored in SD0 because the error is not the one detected by the self-diagnostic function of the
CPU module.
When the request source is a programming tool, a message and an error code are displayed on the programming tool.
When the request source is an intelligent function module or network system, the CPU module returns an error code
corresponding to the requested processing.
Error code
Error item
(Hexadecimal)
4000
H
4001
H
4002
H
4003
H
4004
H
Common error
4005
H
4006
H
4008
H
4010
H
CPU mode
error
4013
H
4021
H
4022
H
CPU file
related error
4023
H
4024
H
4025
H
Error codes returned to request source during
communication with CPU module
Error details
Serial communication sum check error
Unsupported request was executed.
Unsupported request was executed.
Command for which a global request cannot
be performed was executed.
Any operation for the CPU module is
prohibited by the system protect function
provided against the following events.
• The system protect switch is ON.
• The CPU module is starting.
The volume of data handled according to the
specified request is too large.
Initial communication failed.
The CPU module is BUSY.
(The buffer is not vacant).
Since the CPU module is running, the request
contents cannot be executed.
Since the CPU module is not in a STOP
status, the request contents cannot be
executed.
The specified drive memory does not exist or
there is an error.
The file with the specified file name or file No.
does not exist.
The file name and file No. of the specified file
do not match.
The specified file cannot be handled by a user. Do not access the specified file.
The specified file is processing the request
from another programming tool.
Corrective action
• Connect the serial communication cable correctly.
• Take noise reduction measures.
• Check the command data of the MC protocol, etc.
• Check the CPU module model name selected in the
programming tool.
• Check the command data of the MC protocol, etc.
• Check the CPU module model name selected in the
programming tool.
Check the command data of the MC protocol, etc.
• Set the system protect switch of the CPU module to
OFF.
• Perform operation again after the CPU module has
completed starting.
Check the command data of the MC protocol, etc.
• When using serial communication, inquire of the
external device manufacturer for support conditions.
• When using serial communication, check the CPU
module model name selected in the programming
tool.
• When using Ethernet communication, change the
start timing of the communication.
After the free time has passed, reexecute the request.
Execute after setting the CPU module to STOP status.
Execute after setting the CPU module to STOP status.
• Check the specified drive memory status.
• After backing up the data in the CPU module, execute
programmable controller memory format.
Check the specified file name and file No.
Delete the file and then recreate the file.
Forcibly execute the request. Alternatively, complete the
current processing and then send the request again.
APPENDICES
A
221