Mitsubishi Electric MELSEC iQ-R CC-Link IE TSN, User Manual

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4 TROUBLESHOOTING
4.1 Checking with LED
163
4
When the D LINK LED turns off or is flashing
When the D LINK LED turns off or is flashing, check the following.
Check item Action
Is the master station operating normally? • If an error has occurred in the CPU module on the master station, eliminate the cause of the CPU
module error. (

MELSEC iQ-R CPU Module User's Manual (Application))
• If an error occurs in the RJ71GN11-T2 in the master station, take action according to the module
diagnosis procedure. (

Page 166 Checking the Module Status)
Is the master station connected to the network? Connect the master station to the network.
Does the IP address of each station match the
"Network Configuration Settings" under "Basic
Settings" of the master station? Correct the setting of the IP address in "Network Configuration Settings" under "Basic Settings" of the
master station.
• Set IP addresses in a way that does not overlap the third to fourth octets of the IP address in all stations.
• Set the IP address and subnet mask to match the network addresses of all stations.
• Set the third and fourth octets of the IP address to values other than all 0 or all 1.
• Set the host address of the IP address to values other than all 0 or all 1.
• Set an IP address other than a reserved address.
In the "Network Configuration Settings" under
"Basic Settings", are the third and fourth octets of
the IP address of the master station overlapped
with those of any other stations?
In the "Network Configuration Settings" under
"Basic Settings", does the network address
(subnet mask part) of the IP address of the master
station match that of other stations?
Are the third and fourth octets of the IP address
set to all 0 or all 1?
Is the host address of the IP address set to all 0 or
all 1?
Is a reserved address set to the IP address?
Do the used Ethernet cables conform to the
Ethernet standard? Replace the cables with Ethernet cables which conform to the standard. (  MELSEC iQ-R CC-Link IE
TSN User's Manual (Startup))
Is the switching hub used operating normally? • 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.
Does the station-to-station distance meet the
specifications? Set the station-to-station distance within range. (

MELSEC iQ-R CC-Link IE TSN User's Manual
(Startup))
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 connection different from the one set for
"Network Topology" under "Basic Settings" of the
master station? Correct the wiring according to "Network Topology" under "Basic Settings" of the master station. ( 
Page 102 Network Topology)
Has the time synchronization source station been
reset? • Since a station is temporarily disconnected after switching the time synchronization source, wait for it to
return.
• Avoid unnecessary disconnections or returns in a station that is the time synchronization source.
Is the time synchronization source station turned
off?
Is the time synchronization source station
operating normally? Check the manual of the module used for the time synchronization source station.
Has any other station been reset? • Avoid unnecessary reset, since a station is disconnected while resetting.
• Start other stations.
Are other stations turned off? Power on other stations.
Are other stations connected to the RJ71GN11-T2
operating normally? • Check if the modules on the other stations are performing data link using CC-Link IE TSN/CC-Link IE
Field diagnostics. (

Page 169 Checking the Network Status)
• Check the operation status of modules on other stations. (

User's manual for the module used)
Is there any other station that has not set an IP
address? Set the IP address for the slave station for which the IP address is not set.
Is there any other station that is not set in
"Network Configuration Settings" under "Basic
Settings" of the master station? Set the connected slave station to "Network Configuration Settings" under "Basic Settings" of the master
station.
Is a network topology with restrictions used for
connection? Correct the wiring. (

MELSEC iQ-R CC-Link IE TSN User's Manual (Startup))
Are station numbers unique? Change the overlapped station number.
Is the IP address overlapped with another station? Change the IP address of the overlapped station.
Are 121 or more slave stations connected? Change the connection of the slave stations to 120 stations or less.
Are Ethernet devices properly connected to a
network line? Correct the mixed structure of the Ethernet device. (  MELSEC iQ-R CC-Link IE TSN User's Manual
(Startup))