Mitsubishi Electric MELSEC iQ-R Series User Manual page 145

When the LINK LED turns off
When the LINK LED turns off, check the following.
Check item
Do the used Ethernet cables conform to the
Ethernet standard?
Does the station-to-station distance meet the
specifications?
Does the cabling condition (bending radius) meet
the specifications?
Is any Ethernet cable disconnected?
Is the switching hub used operating normally?
Are other stations connected to the Motion module
operating normally?
Does the communication speed of the connected
device match the communication speed set in
"Communication Speed"?
When using a Motion module with an Add-on
baseSystem version of "1.7" or earlier, is the
communication speed of the connected device 1
Gbps?
If "Communication Speed" is set to 100 Mbps for
the master station to connect a device with a
communication speed of 100 Mbps, is the auto-
negotiation of the device enabled?
Action
Use an Ethernet cable that conforms to the standard. For details, refer to "Wiring" (in the chapter of the
control mode used) of the following manual.
MELSEC iQ-R Motion Module User's Manual (Startup)
Set the station-to-station distance within range. For details, refer to "Wiring" (in the chapter of the control
mode used) of the following manual.
MELSEC iQ-R Motion Module User's Manual (Startup)
Refer to the manual for the Ethernet cable, and correct the bending radius.
Replace the Ethernet cable.
• Use a switching hub that conforms to the standard. For details, refer to "Wiring" (in the chapter of the
control mode used) of the following manual.
MELSEC iQ-R Motion Module User's Manual (Startup)
• Power off and on the switching hub.
Check the manual of the module used for the other stations and take action accordingly. ( User's
manual for the module used)
Connect the device with the communication speed set in "Communication Speed".
Connect devices which support a communication speed of 1 Gbps.
Enable the auto-negotiation of the connected device. Or, connect a device with the auto-negotiation
enabled.
4 TROUBLESHOOTING
143
4.1 Checking with LED
4