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Troubleshooting Procedures Section 8-4
8-4-6 Network Connection Problems
Is the LNK indicator
lit?
Did all nodes
fail to respond to ping
command?
Is the twisted-pair
cable secured?
END
• Firmly secure the cable.
• Power may not be being supplied to the hub.
Y
N
Y
N
N
Did a particular
node fail to respond to
ping command?
• The remote node may not support ICMP.
Y
N
Is the remote
node functioning as an
FTP client?
Y
N
Y
Only SD indicator
is flashing.
• Connect by FTP.
Is the twisted-pair
cable between the Ethernet Unit
and the hub straight
cable?
• Use straight cable.
N
Y
Network connection problem occurred.
Go through the procedure in
Startup Problems before
starting this procedure.
Execute the ping
command for all nodes
connected to the network.
• Replace first the twisted-pair cable, then the hub,
and then the Ethernet Unit, in order.
• The twisted-pair cable for that node may be
disconnected.
Execute FINS PROTOCOL
STATUS READ.
• If the following parameters are counted, the corresponding
communications services may not be possible with the remote
node.
[IP status] (2) (3) (5) (6) (All communications services)
[ICMP status] (5) (6) (7) (8) (ping)
[TCP status] (3) reception status (4) (5) (6) (FTP, TCP sockets)
[UDP status] (1) (2) (3) (FINS communications, UDP socket)
• If the following parameters are counted, the load at the Ethernet
Unit may be too high. Adjust the user applications.
[IP status] (4) (8) (9)
