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11
TROUBLESHOOTING
Error
Error Name
Code
7404
H
Receive error
7405
H
7410
Send error
H
Broadcast
address
7420
H
specification
error
Ethernet
7421
H
address error
IP check sum
7422
H
error
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Description
A receive error occurred.
The internal receive buffer
has no free space.
A send error occurred.
The broadcast address was
specified in TCP-based
transmission.
The Ethernet address of the
target device is unknown.
A check sum error was
detected in the IP protocol.
Lit LED
Corrective Action
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Hardware fault.
• Retry after a little while.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Hardware fault.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
COM.ERR.
error.
• As the line may be busy, retry
after a little while.
• Hardware fault.
Review the IP address setting
of the target device at the time
COM.ERR.
of transmission.
• Review the IP address of the
target device at the time of
transmission.
• Check whether the target
device with the specified IP
address exists on the line or
not.
• Check whether the operation
status of the target device is
COM.ERR.
normal or not.
• Check the line status for an
error.
• As the line may be busy, retry
after a little while.
• Replace the target device with
the one having the ARP
function.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
MELSEC-Q
Occurrence
1)
2)
3)
4)
5)
(Continued on next page)
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