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CHAPTER 15 TROUBLESHOOTING
15
15.3 Checking for Functional Errors
15.3.4 Ethernet communication
15.3.4 Ethernet communication
(1) Direct connection is not possible
If Ethernet communication is not possible through direct connection with the programming tool, check the
following items.
If Ethernet communication cannot be performed even after taking the above actions, the possible cause is a
hardware failure.
Please consult your local Mitsubishi representative.
*1 When two or more Ethernet ports are enabled in the network connections setting on the personal computer,
communication by direct connection is not possible. In the setting, leave only one Ethernet port enabled for direct
connection and disable other Ethernet ports.
Check item Corrective action
The CPU module is not directly connected to the
programming tool with a single cable.
Directly connect the CPU module to the programming tool
with a single cable.
*1
The setting on the connected device (personal computer) is
incorrect.
• Ethernet port setting
• Firewall setting
• Communication setting of security software
Correct the setting on the connected device.
In the Transfer Setup setting of the programming tool,
"Ethernet Port Direct Connection" is not selected for the PLC
side I/F PLC Module.
Correct the Transfer setup setting.
When parameters are read after switching to USB
connection, "Disable direct connection to MELSOFT" is
selected in the Built-in Ethernet port setting.
Correct the parameter.
In "Status of Each Connection" of "Ethernet Diagnostics",
MELSOFT Direct Connection is set in forced deactivation
status.
Disable the forced deactivation.
In the "Error History" of "Ethernet Diagnostics", an error for
direct connection is detected.
Take corrective actions according to the error code.
Communication can be performed by increasing the value of
communication time check period or number of retries in the
detailed host station setting of "Transfer Setup"
• Adjust the value of communication time check period or
number of retries.
• Check the condition of the cables, connected device
(personal computer), and CPU module.
The connected device (personal computer) does not support
the direct connection.
Connect a hub.
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