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CHAPTER2 Ethernet Unit
Checkpoints
• Check the TELNET parameter to find
if it was set to stop operation during
logout.
• Check the TELNET parameter to find
if communication status is longer than
the time set for timeout.
• Check if a cable is detached or power
supply for the HUB or other equipment
is off.
• Check if operating problems are
occurring in devices such as the HUB
due to noise, etc.
• Too short of a period was set for the
no-response timeout period.
• Try substituting with another Ethernet
unit.
Action
• Always use a LOGOUT or BYE
command to terminate a TELNET
communication.
• Reset the parameter so operation
continues during logout.
• Set so communication time does not
exceed the timeout limit. Otherwise
increase the communication timeout
period or disable the timeout function.
• Check the network and repair/restore
any problem locations.
• Replace a device having operating
errors with another device.
• Set the no-response timeout period to
match the network structure and traffic
conditions. Or disable the timeout
function.
• If operation returns to normal, then the
Ethernet unit is defective so replace it.
No.
4
Probable causes
TELNET
communication
cuts off by itself
without a
LOGOUT or
BYE command
being issued.
TELNET
parameter was
set to stop
operation during
logout.
Communication
status continues
for a fixed period
and then cuts off
automatically at
timeout.
No-response
status continues
for a fixed period
versus the keep-
alive packet and
then cuts off
automatically at
timeout.
Ethernet unit is
defective.
1)
2)
3)
4)
5)
Symptom
Program
stops by itself
during
automatic
operation.