Mitsubishi Electric MELSEC iQ-F Series User Manual page 111

■CC-Link IE Field Network Basic
Check item
Is the timeout time setting of the master station too short?
Are there any remote stations having an error?
Is the line load high?
Is CC-Link IE Field Network Basic being simultaneously executed at a
different network address on the same line?
Are data communications with other Ethernet devices being performed on the
same line?
Is any of the following function being executed?
• Access from GX Works3 (such as ladder monitor)
• Latch function
• Data logging function
When the link scan time delays
If the link scan time is slow, refer to  Page 108 When a station is repeatedly disconnected and reconnected.
When cyclic transmission of the master station stops
If the master station's cyclic transmission stops, check the following.
Check item
Is the transmission status of remote stations normal?
Troubleshooting for the MQTT communication function
When any problem occurs in relation to the MQTT communication function, check the following.
Check item
Is the interval by which to call FB: MQTT_Receive too long?
Do the publisher and the subscriber use the same message format?
Is there any problem with the network environment or the server?
Is an identical client ID used for multiple devices?
Does any of the following problems occur?
• Cable failure
• Cable connection destination
• IP address setting
• IP address duplication on the network
• Is "Connection Control Setting" for "Certificate Configuration Tool" set to
"Connection disable" in the Ethernet module?
• Do multiple tools attempt to connect simultaneously?
Is the communication speed slow?
Action
Increase the timeout time of the master station.
Perform troubleshooting for the remote station having an error.
Lower the CC-Link IE Field Network Basic communication frequency, and
lower the line load.
Separate the network and configure two CC-Link IE Field Network Basic lines.
Separate the network for other Ethernet devices from the CC-Link IE Field
Network Basic line and configure the CC-Link IE Field Network Basic line.
Stop the function. Or, modify settings. For example, extend the execution
interval, decrease the execution frequency, or reduce the range of the
function.
Action
• If there are any disconnected remote stations, take actions according to the
error details.
• If there are no disconnected remote stations, check the network connection.
A problem may be occurring from a device other than those set in the
master station.
Action
Adjust the call interval of FB: MQTT_Receive.
Ensure that the publisher and the subscriber use the same message format.
Solve any problem with the network environment or the server.
Ensure that an identical client ID is not used.
Check the cause and make a modification if any problem exists.
Reduce the communication load of other applications on the same
communication line, or separate the communication line.
10.5 Troubleshooting by Symptom
10 TROUBLESHOOTING
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