Mitsubishi Electric QJ71MT91 User Manual page 270

11 TROUBLESHOOTING
Error
Error Name
Code
7423
H
7424
H
7425
H
7426
H
7427
H
ICMP error
packet
7428
H
reception
7429
H
742A
H
742B
H
742C
H
Router relay
742D
H
function error
UDP check
7440
H
sum error
TCP ULP
7450
H
timeout error
TCP check
7451
H
sum error
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Description
The error packet of ICMP
was received.
• Without the routing
information setting of the
basic parameter, data were
attempted to be sent to the
target device that has a
different IP address class or
net ID.
• The routing information
setting of the basic
parameter is erroneous.
A check sum error was
detected in the UDP protocol.
• The TCP ULP timer timed
out.
• ACK is not returned from
the target device.
A check sum error was
detected in the TCP protocol.
Lit LED Corrective Action
• Review the setting of the
router information.
• Check whether the router
operates normally.
• Check the router
communication path for any
error.
• Check the communication
path ahead of the router for
any error.
• Review the IP address of the
COM.ERR.
target device at the time of
transmission.
• Check whether the target
device with the specified IP
address exists on the line or
not.
• As the line may be busy, retry
after a little while.
• Review the IP reassembly
timer value of the target
device.
• Review the IP address of the
target device at the time of
transmission.
• Review the setting of the
COM.ERR.
routing information.
• Review the setting of the
subnet mask pattern.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
COM.ERR.
• As the line may be busy, retry
after a little while.
• Review the TCP ULP timer
value of the basic parameter.
• 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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