12 Troubleshooting
12 - 4
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
MS NS
Cause Corrective action
Green Red Green Red
Not Lit Not Lit Not Lit Not Lit • No power is supplied by the
Unit power supply.
• Restarting is in progress for the
Unit.
• Waiting for initialization to start.
Check the following items and make
sure that power is correctly supplied
from the Unit power supply.
Checks Related to the Power Sup-
ply
• Make sure that the power supply
cable is wired properly.
• Make sure that there are no
breaks in the power supply cable.
• Make sure that the power supply
voltage is within the specified
range.
• Make sure that the power supply
has enough capacity.
• Make sure that the power supply
has not failed.
• Wait for the Unit to finish initializ-
ing.
Check the UNIT PWR indicator for
additional information.
Flashes
at 0.5-s
inter-
vals.
--- --- --- Restarting or initialization is in
progress for the Slave Terminal.
--- (This is the normal status. Wait
until processing is completed.)
Lit --- Flashes
at 0.5-s
inter-
vals.
--- No tag data links or connec-
tion-based message (class 3)
connection with an EtherNet/IP
master has been established.
If there is no connection even
though connections, e.g., for tag
data links, are set in the EtherNet/IP
master, there may be mistakes in
the connection settings in the Ether-
Net/IP master. Check for errors
related to connections that were
detected by the EtherNet/IP master
and review the connection settings
in the EtherNet/IP master.
Lit --- Lit --- Normal operation and online com-
munication connection is estab-
lished.
--- (This is the normal status.)
--- Lit --- --- • Bus Controller Error
• Non-volatile Memory Hardware
Error
• Memory Corruption Detected
Cycle power to the Slave Unit.
If cycling the power does not clear
the error, replace the Slave Unit.
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