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4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
*1 When the device has been reconnected to the switching hub, or the switching hub has been replaced, it may take some time to read the
MAC address. If so, retry communication from the Ethernet device again after a while or power on the switching hub again.
*2 A device on Ethernet has a table of IP addresses and their corresponding MAC address, called "ARP cache". When a device on the line
is replaced by the one having the same IP address, the MAC address in the ARP cache is different from that of the replaced device;
therefore, communications may not be normally performed. The "ARP cache" is updated by resetting the device or after a while. The
time varies depending on the device.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Module communication test (
Page 221 Module communication test)
• Cable test (
Is the CC-Link IE Field Network gateway setting correct? (This
applies only when the request source device, request destination
device, and modules between them do not have the same first and
second octets of the IP address.)
• Check and correct the setting in the module compatible with the CC-Link IE Field
Network gateway setting. (
Manual for the module compatible with the CC-Link IE
Field Network gateway setting used)
• When "Dynamic Routing" under "Application Settings" is set to "Disable", set the
communication path to the CC-Link IE Field Network gateway setting station in
"Routing Setting" of "CPU Parameter".
• When "Dynamic Routing" under "Application Settings" is set to "Enable", check
'Communication path determination status' (Un\G24480 to Un\G24495) to check that
the communication path to the transfer destination network number which is set in the
third octet of the Ethernet device IP address is determined.
Are settings configured in modules connected to the Ethernet
device correct?
• First and second octets of the IP address
• Subnet mask pattern
• Default router IP address
Check and correct the setting in the module connected to the Ethernet device.
Is the firewall or proxy server setting enabled on the Ethernet
device?
Check and correct the settings on the Ethernet device.
Is a response to the Ping command (ICMP echo request) enabled?
Is the antivirus software on the Ethernet device blocking the
communication?
Check and correct the antivirus software settings on the Ethernet device.
• Is the security setting level of the antivirus software low?
• Is a response to the Ping command (ICMP echo request) enabled in the firewall
settings?
When the Ethernet device has two or more Ethernet ports, have
different default gateway settings been configured for each Ethernet
port?
• Set the same IP address in the default gateway of each Ethernet port.
• Set the communication route on the Ethernet device side using the route command so
that communications using the IP packet transfer function can be transmitted to the
Ethernet device through the module connected to the Ethernet device. (This applies
only to Ethernet devices that have the route command, such as Microsoft
Windows
.)
When the gateway setting is completed, execute the Ping command from the Ethernet
device to check whether communications can be performed.
Is the switching hub used operating normally?
• If an error has occurred in the switching hub, eliminate the error cause.
• If communications cannot be performed although no error has occurred in the
switching hub, replace the switching hub.
Has any device on the line, such as an Ethernet device, Ethernet-
equipped module, Ethernet adapter module, and switching hub,
been replaced? (This applies only when the device has been
replaced by the one having the same IP address.)
Reset the device on the line.
Check item
Action
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