Mitsubishi Electric Q26UD(E)HCPU User Manual page 292

(2) Ethernet communication is not possible when using a method other than
direct connection
If Ethernet communication is not possible in a method other than direct connection with the programming tool,
check the following items.
IP addresses are overlapping.
The specified protocol is incorrect.
"Ethernet Port Direct Connection" is selected.
The specified IP address or host name is incorrect.
If Ethernet communication cannot be performed even after taking the above actions, the possible cause is a
failure of the connected device.
Check the items described in
(3) Ethernet communication is not possible with the connected device
If Ethernet communication is not possible with the connected device, check the following items.
An error has occurred in a hub.
The setting on the connected device (personal computer) is
incorrect.
• IP address setting
• Ethernet port setting
• Firewall setting
• Communication setting of security software
The SD/RD LED of the CPU module is not flickering during
communication.
IP addresses are overlapping.
The ERR. LED turns on or flickers when power is resupplied. Remove the error cause. (
When parameters are read after switching to USB
connection, the Built-in Ethernet Port Setting is incorrect.
In "Status of Each Connection" of "Ethernet Diagnostics",
MELSOFT Direct Connection is set to the forced deactivation
status.
In the "Error History" of "Ethernet Diagnostics", an error for
direct connection is detected.
290
Check item
Page 290, Section 15.3.4 (3).
Check item
Corrective action
• Check the duplicate IP addresses using the Find CPU
function, and correct the IP addresses.
• Correct the IP address of the programming tool (personal
computer) so that it differs from the address of the CPU
module.
• Disconnect the device from the network, and ping the IP
address of the disconnected device. If there is any
response, the same IP address is used. Correct the IP
address.
Correct the Transfer Setup setting.
Corrective action
Remove the error from the hub.
Correct the setting on the connected device.
Confirm the wiring.
• Correct the IP address of the connected device so that it
differs from the address of the CPU module.
• Disconnect the device from the network, and ping the IP
address of the disconnected device. If there is any
response, the same IP address is used. Correct the IP
address.
Correct the parameter.
Disable the forced deactivation.
Take corrective actions according to the error code.
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Page 282, Section 15.2)