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4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
When transient transmission cannot be performed
The following lists the actions to be taken if transient transmission cannot be performed with the target station, and the
engineering tool cannot perform monitoring.
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)
• Communication Test ( Page 39 Communication test)
When a station is disconnected from the network
The following is the action to be taken when a station in data link is disconnected.
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 ( Page 239 Cable Test)
When a station is repeatedly disconnected and reconnected
The following lists the actions to be taken when a station in data link is repeatedly disconnected and reconnected.
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 ( Page 239 Cable Test)
Check item Action
Is the D LINK LED of the master or slave station turned off? Perform troubleshooting for when the D LINK LED turns off or is flashing.
( Page 216 When the D LINK LED turns off or is flashing)
Is the baton pass status of the destination normal? In the CC-Link IE Field Network diagnostics, identify the cause of the error
and take action. ( Page 223 Checking the Network Status)
Are the following control data of the dedicated instruction correct?
• CPU type of the target module
• Target network number
• Target station number
Correct the control data of the dedicated instruction.
Is the station number of the master/local module duplicated with any of the
other stations?
Change the duplicated station number.
Is the network number duplicated on the network? Change the duplicated network number.
Is a communication path by the dynamic routing function is determined? • Power on the system and start transient transmission after a while.
• When "Dynamic Routing" under "Application Settings" of the station on the
communication path is set to "Disable", change it to "Enable".
Does the relay station to be passed support the dynamic routing function? If the relay station to be passed does not support the dynamic routing function,
set all the stations on the communication path in "Routing Setting" of "CPU
Parameter".
Are multiple link dedicated instructions with same channel setting executed
simultaneously?
• Set different channel to each instructions.
• Shift the execution timing of the link dedicated instructions.
Check item Action
Is the ambient temperature for the module within the specified range? Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Check item Action
Are 1000BASE-T-compliant Ethernet cable used? Replace the cables with 1000BASE-T-compliant Ethernet cables. (
MELSEC iQ-R Ethernet/CC-Link IE User's Manual (Startup))
Is the station-to-station distance 100m or less? Change the station-to-station distance to 100m or less.
Does the cabling condition (bending radius) meet the specifications? Refer to the manual for the Ethernet cable, and correct the bending radius.
Is any Ethernet cable disconnected? Replace the Ethernet cable.
Is the switching hub used operating normally? • Check if a 1000BASE-T-compliant switching hub is used. ( MELSEC iQ-
R Ethernet/CC-Link IE User's Manual (Startup))
• Power off and on the switching hub.
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