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53
F250
Setup Manual
SECTION 5
Troubleshooting and Maintenance
SE
CTION 5
T
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ble
sh
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Serial Interface (Ethernet) Errors
Problem
Probable cause
Reference
No communications are
possible.
•
A 10 Base-T Crossover Cable is not being used for a 1:1
connection.
•
10 Base-T Straight-through Cables are not being used for
the 1:N connections.
Power is not being supplied to the HUB, the settings are
incorrect, or the connections are incorrect.
•
The personal computer's IP Address and Subnet Mask
settings are not correct or the settings are duplicated in
another device.
•
The Controller's IP Address and Subnet Mask settings are
not correct or the settings are duplicated in another device.
•
The IP Address set for the Controller in the computer's
communications software is incorrect.
•
The communications mode was not set to [Normal] or
[Menu] in the [System settings/Communication/Serial].
The status of communications can be checked with the I/O
monitor.
•
The Controller is being accessed by another computer.
•
Communications are being affected by a noise source
(such as a power line) that is too close to the Controller or
communications cables.
•
Communications are not set for a TELNET connection
(TCP/IP, port 23) in the computer's communications
software.
Operation
Manual
The Unit operates well
initially, but after a while
there is no response from
the Controller.
•
The reception buffer on the external device (e.g.,
computer) is full.
Check that settings allow the data to be properly received.
–
The response from the
Controller is slow.
(It takes too long to
transfer data and errors
occur.)
•
The IP Address of the Controller or computer is duplicated
in another device.
•
Communications are being affected by a noise source
(such as a power line) that is too close to the Controller or
communications cables.
•
The network's communications load is too heavy.
•
The computer's processing load is too heavy.
(A program that requires a lot of processing capacity is
being run simultaneously.)
Operation
Manual