Troubleshooting by Symptom
The following for troubleshooting by symptom.
IP address duplication detection
When turning the power from off to on, resetting, or connecting to the network, the CPU module check whether there is any
device with duplicated IP address on the same network. When the IP address duplication is detected, an error occurs and
appears in the event history. Also, with the following devices, it is possible to check whether there is an IP address duplication,
and the MAC address of the device with duplicated IP address can be checked.
• 'Same IP address state storage area' (SD10251)
• 'MAC address of the already connected station' (SD10252 to SD10254)
• 'MAC Address of the station connected later' (SD10255 to SD10257)
After the IP address duplication detection, the contents of the IP address duplication (error information, special device, event
history) are held until the power is turned off to on, reset, or the error is cleared.
If the firmware version of the CPU module is lower than "1.061 ", when the IP address duplication is detected,
the CPU module will stop the processing and the network will be down. Also, the above special devices are
Restoration method of IP address duplication error
The restoration method of IP address duplication error (Error code: 2160H) is shown below.
Perform module diagnostics, and check that IP address duplication error does not occur.
When the module diagnostics cannot be performed by an Ethernet communication failure, perform direct connection with
the other network, and check that IP address duplication error does not occur in the module diagnostics or the event
When the IP address duplication error occurred, check the special device and the device with duplicated IP address.
To return to the network, change the IP address of the CPU module to an IP address which is not duplicated in the
network, turn the power off to on, or reset, and connect the CPU module to the original network.
13.3 Troubleshooting by Symptom