Mitsubishi Electric MELIPC MI5000 Series User Manual page 215

Transmission status repeats disconnection and reconnection
In the event that transmission state repeats disconnection and reconnection, then check the following items.
Check Ethernet
Check the following items.
Check item
Is the Ethernet cable fully inserted into the connector?
Does the used cable meet Ethernet specifications?
Is the Ethernet cable broken or nearly broken?
Is there a powerful source of noise near the Ethernet cable?
Is there any packet loss or errors on other devices or hubs?
Is a hub that can handle communication speeds used by the connected
master station/slave station being used?
Are there any delays in response, error responses, or no responses with
functions using the Ethernet port (CH1) such as FTP, socket communications,
or SLMP?
*1 Depending on the hub, communications may be stopped as a result of a high communication load. In these cases, consult with the
manufacturer of the hub being used.
*2 In the event that the PC or this product has been re-connected to the switching hub or the switching hub was replaced, re-reading of the
MAC address may take some time. In these cases, wait a while and try again or turn the power of the hub OFF and ON.
Confirm CC-Link IE Field Network Basic
Check the following items.
Check item
Are the master station timeout settings too short?
Are any faults being generated by the slave station?
On the same circuit, is CC-Link IE Field Network Basic running at the same
time on a different network address?
Are communications with other Ethernet devices being carried out on the
same line?
Are any of the following functions being run?
• Access from MI Configurator
• Access using a virtual Ethernet
Are groups excessively separated?
Are slave stations with a slow response time configured to groups with a fast
link scan time? Alternatively, are slave stations with a fast response time
configured to groups with a slow link scan time?
Corrective action
• Properly lock the Ethernet cable.
• Check that the Ethernet cable is also correctly connected to the other
devices and hubs.
Check the cable specifications.
Replace the Ethernet cable.
• Increase the distance of the Ethernet cable from the source of the noise.
• Replace with a cable with better noise shielding.
*1
Check the manual of the device that is producing errors or packet loss, and
then take measures.
Replace with a hub that can handle the communication speeds used by the
connected master station/slave station.
Stop the function. Alternatively, review settings, such as by increasing the
interval between executions of these functions or decreasing their frequency.
Corrective action
Set the master station timeout settings to a longer value.
Perform troubleshooting for the slave station.
Separate into a separate circuit network and create a CC-Link IE Field
Network Basic.
Separate the CC-Link IE Field Network Basic network and other Ethernet
device network to create CC-Link IE Field Network Basic.
Stop the function. Alternatively, review settings, such as by increasing the
interval between executions of these functions, decreasing their frequency, or
reducing the range.
If the number of stations is 16 or less, review the minimum number of groups,
and, for example, form one group.
• Refer to the manual of the slave stations to be used and check the standard
response time.
• Check and correct the group number of slave stations in the network
configuration settings.
*2
Appendix 1 Troubleshooting by Symptom
A
APPX
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