Mitsubishi Melsec-Q Series User Manual page 338

12.2.32 When Ethernet communication with the target device is not available
Refer to the following flowchart when Ethernet communication with the target device is not available.
Ethernet communication with the target
device is not available.
Any cable disconnection,
poor contact, or power-off or
an error of the hub? *
YES
Is the target device's
IP address set correctly? *
YES
How is the "SD/RD"
LED of the CPU module during
communication?
Flashing
How is the "POWER"
LED of the power supply module?
On (green)
To diagnose the built-in
Ethernet port, power on the
CPU module again or reset it.
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12 - 43
NO
1
NO
Ask your network administrator for the
NO
target device's IP address, and set it
2
correctly.
NO
Off
Are cables and
YES
hub connected correctly? *
Check wiring of cables and hub
and connect them correctly. *
Is Ethernet
NO
communication available
with the target device?
Off or
on (red)
(When off)
(When on (red))
*1: Supplemental remarks on switching hubs
Reconnecting a personal computer or CPU to a
switching hub or replacing the switching hub with
another may take time for the hub to read MAC
addresses.
Retry it after a little while, or power on the hub again.
*2: Check the following:
Is an IP address set?
Is the Ethernet port enabled?
Is the Ethernet port device operating normally?
Is the firewall setting disabled?
If enabled,is communication with the Built-in Ethernet QCPU excluded in the setting?
Isn't communication with the Built-in Ethernet QCPU disabled by security software?
Perform the following.
Connect cables properly.
Power on the hub.
Remove the error in the hub.
Is Ethernet
communication available
with the target device?
Is Ethernet
communication available
with the target device?
1
NO
1
YES
Section 12.2.6
When the "POWER" LED turns off
Section 12.2.8
When the "POWER" LED turns on (red)
YES
YES
Completed