Troubleshooting Procedures
Section 10-4
154
10-4-2 Network Connection Problems
Failed commu-
nications
Power supply
problems
Is the main power supply indicator lit?
Check the power supply, power cable con-
nection and voltage.
Is the power supply indicator lit on the
Communications Unit?
Check the power supply, power cable con-
nection and voltage.
Is the HUB power supply indicator lit?
Check the power supply, power cable con-
nection and voltage.
Unstable or failed communications Does each node respond correctly to the
Ping command?
Check the power supply and cables of
nodes that fail to respond.
Is the collision indicator lit frequently?
Check the contact between cables and
connectors.
Check the error with an analyzer.
Are there a maximum of four repeater lev-
els?
Reconfigure the network using four repeat-
ers max.
Is the distance between the hub and nodes
(cable length) within 100 m?
Reconfigure the network with a distance
between the hub and nodes of 100 m max.
Are the hubs turned ON?
Check the hub power supply and power
cable connection.
Is the correct communications cable con-
nected?
Use the correct communications cable,
referring to
. For a baud
rate of 100 Mbps, the cable must be cate-
gory 5 or 5e.
Is the communications cable connector
correctly attached?
Check that the communications cable con-
nector is securely attached.
Is the communications cable wired cor-
rectly (straight/crossed)?
Check the hub specifications and use the
correct wiring for the cable. Check the hub
settings.
Are the hub settings correct?
Correct the settings if the hub uses
SCADA ports or individual settings for
each port. For details, refer to the hub’s
operation manual.
Are there too many cascade connections
from the switching hub?
Switching hubs are subject to transmission
delays. Therefore, the cycle time will be
affected if multiple switching hubs are con-
nected using cascade connections. Either
increase the minimum allowable frame
interval or reconfigure the network.
Are Ethernet communications other than
FL-net being performed on the same net-
work?
Communications will not be performed cor-
rectly if another network is combined with
the FL-net network. Make sure that only
FL-net communications are performed on
the FL-net network.
Is the network load too high?
If a high network load (data link capacity,
number of nodes) is high, increase the
value of the minimum allowable frame
interval. The minimum allowable frame
interval can be changed using the CX-
FLnet or FL-net Unit Support Software.
After changing the setting, restart the FL-
net Unit or cycle the PLC power.
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Страница 276: ...250 International System of Units Appendix G...