Table 7-2 Network Problems And Repairing (Concerning Unstable Communications) - Hitachi S10mini User Manual

7 TROUBLESHOOTING
(2) Network problems and remedies (concerning unstable communications)

Table 7-2 Network Problems and Repairing (Concerning Unstable Communications)

Inspection
Problem
item
Communi- Transmission
cation cannot path
be
established
or is
unstable.
Communica-
ting-station
device setup
Inspection procedure
Check whether the coaxial cable
external conductor is grounded at one
point.
Check that the AUI cable's shielded
wire is properly grounded.
Check that all the stations properly
respond to the Ping command.
Check whether the collision lamp
frequently glows.
Check that no more than four repeaters
are connected in cascade.
Check that each segment is within the
specified length limit.
Check that two terminal resistors are
installed on both ends.
Check that the number of connected
devices inside each segment is within
the specified limits.
Check that no more than three segments
are connected to the device.
Check that the repeater power supply is
ON.
Check that the network IP address is
properly set.
Check that the device station number is
properly set.
Check that the device parameters are
properly set.
Check whether the CD (carrier
detection) lamp glows steadily or
intermittently.
Check whether the TX (transmission)
lamp glows steadily or intermittently.
Check whether the LK (link) lamp
glows steadily.
Establish the proper ground connection as
directed in "8.6 FL-net Network Installation
Procedures."
Ground the shielded wire in accordance with
manufacturer instructions.
Check the power supplies and cables of
stations that fail to respond.
Check that the cables and connectors are not
in poor contact. With an analyzer, identify
abnormalities.
Review the configuration in accordance with
"8.6 FL-net Network Installation
Procedures."
Establish the proper ground connection as
directed in "8.6 FL-net Network Installation
Procedures."
Establish the proper ground connection as
directed in "8.6 FL-net Network Installation
Procedures."
Establish the proper ground connection as
directed in "8.6 FL-net Network Installation
Procedures."
Establish the proper ground connection as
directed in "8.6 FL-net Network Installation
Procedures."
Check for a faulty power supply, disconnected
power cable, and improper voltage.
With the support tool and analyzer, ensure
that the IP address setting is correct.
With the support tool and analyzer, ensure
that the station number setting is correct.
With the support tool, ensure that the device
parameter settings are correct.
Ensure that the communication cable, AUI
power supply, and other items are normal.
Ensure that the device settings are correct.
Ensure that the device parameter settings are
correct.
7-4
Remedy