Mitsubishi MELSEC-F User Manual page 249

11 TROUBLESHOOTING
Error code
(abnormal Description of error
code)
When TCP is used, the checksum of the
C041
H
receive data is incorrect.
When UDP is used, the checksum of the
C042
H
receive data is incorrect.
The checksum in header of IP packet received
C043
H
is incorrect.
C044
H
to An error packet of ICMP was received.
C048
H
C049 An error packet of ICMP was received.
H
An error packet of ICMP was received.
C04A (An IP assembly timeout error occurred in an
H
external device.)
An IP assembly timeout error occurred.
1
(The remaining part of divided data could not be
C04B
H
received and a timeout occurred.)
Cannot send because there is no space in the
C04C
H
internal buffer, e.g. the IP header buffer.
ASCII code data that cannot be converted to
binary code is received when ASCII code
C050
H
communication is set in the operational settings
of the Ethernet module.
C051
H
The number of read/write points is outside the
to
allowable range.
C054
H
• Read/write request exceeds the maximum
address.
C056
H
• Address is 0.
Incorrect designation of command and
C059
H
subcommand.
C05A The Ethernet module cannot read from/write to
H
the designated device.
C05B
H
The content of a request is incorrect.
C05C (Requesting read/write in bit units to word
H
devices.)
Communication time between the Ethernet
C05E module and PLC exceeded the monitoring
H
timer.
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• Review the checksum on the external device
side and send the correct value.
• Investigate the conditions of the line (noise,
distance between the line and power line,
contact of each device, etc.)
• Check the operation of the external device.
• Check that the connection cable is not
dislocated.
• Check the operation of the external device.
• Send after an arbitrarily selected time has
elapsed because packets may be congested
on the line.
• Check that the connection cable is not
dislocated.
• Correct the IP assembly timer value of the
external device existence timer timeout.
• Check the operation of the external device.
• Send after an arbitrarily selected time has
elapsed because packets may be congested
on the line.
• Check that the connection cable is not
dislocated.
• Correct the IP assembly timer value and
execute the initial processing again.
• Send the same data again and check that the
response is received.
• Select binary code communication in the
operational settings, and restart the Ethernet
module.
• Correct the data sent from the external side
and send again.
• Correct the number of read/write points and
send to the Ethernet module again.
• Correct the head address or the number of
read/write points and send to the Ethernet
module again.
(The maximum address must not be
exceeded.)
• Review the content of the request.
• Examine the device to be read/written.
• Correct the content of the request and send to
the Ethernet module again.
(Correction of subcommand, etc.)
• Increase the monitoring timer value.
• Check whether or not the PLC operates
normally.
1 When this error occurs, the COM.ERR light turns on, but turns off again about one second
later.
Error handling
MELSEC-F
Storage destination
BFM# BFM# BFM# BFM#
105 124 125 126
BFM# BFM#
229 22649
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