Mitsubishi Electric MELSEC iQ-R Series User Manual page 167

When the L ER LED turns on
When the L ER LED turns on, check the following.
Check item
Are the Ethernet cables used normally?
Is the switching hub used operating normally?
Is there any source of noise near the module or
cables?
Is "Network Topology" of the master station set to
"Ring"?
Is the module operation mode setting of the
master station set to "Online"?
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 RJ71GN11-T2
operating normally?
Does the communication speed of the connected
device match the communication speed set in
"Communication Speed"?
If the RJ71GN11-T2 with a firmware version of
"03" or earlier is used, is the communication
speed of the connected device 1Gbps?
If "Communication Speed" is set to 100Mbps for
the master station and local station to connect a
device with a communication speed of 100Mbps,
is the auto-negotiation of the device valid?
If the above actions do not solve the problem, perform the following test to check for an error.
• Module communication test ( Page 168 Module Communication Test)
Action
• Use an Ethernet cable that conforms to the standard. ( MELSEC iQ-R CC-Link IE TSN User's
Manual (Startup))
• Set the station-to-station distance within range. ( MELSEC iQ-R CC-Link IE TSN User's Manual
(Startup))
• If the Ethernet cable is disconnected, reconnect it.
• Use a switching hub that conforms to the standard. ( MELSEC iQ-R CC-Link IE TSN User's Manual
(Startup))
• Power off and on the switching hub.
Change the location of the module or cables.
• Correctly connect the port where the L ER LED is on in the ring topology.
Set "Module Operation Mode" under "Application Settings" of the master station to "Online". ( Page
111 Module Operation Mode)
Action
Replace the cables with Ethernet cables which conform to the standard. ( MELSEC iQ-R CC-Link IE
TSN User's Manual (Startup))
Set the station-to-station distance within range. ( MELSEC iQ-R CC-Link IE TSN 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. ( MELSEC iQ-R CC-Link IE TSN 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 1Gbps.
Enable the auto-negotiation of the connected device. Or, connect a device with auto-negotiation enabled.
4 TROUBLESHOOTING
165
4.1 Checking with LED
4