12 Troubleshooting
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NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
Event name Link OFF Detected Event code 84540000 hex
Meaning Disconnection of an Ethernet link was detected.
Source EtherNet/IP Source details EtherNet/IP
Coupler Unit
Detection
timing
After link is
established
Error
attributes
Level Observation Recovery Reset error in
EtherNet/IP
Coupler Unit.
Log category System
Effects
User program
Continues. Operation Not affected.
Sys-
tem-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
An Ethernet cable is broken, dis-
connected, or loose.
Connect the Ethernet cable
securely. If the cable is broken,
replace it.
Connect the Ethernet cable
securely. Check the cable to make
sure that it is not disconnected.
The Ethernet switch power supply
is turned OFF.
Turn ON the power supply to the
Ethernet switch. Replace the
Ethernet switch if it fails.
Do not turn OFF the power supply
to the Ethernet switch.
Link speed mismatch. Make the port settings at the
remote node to the auto negotia-
tion setting.
Make the port settings at the
remote node to the auto negotia-
tion setting.
Noise Implement noise countermea-
sures if there is excessive noise.
Implement noise countermea-
sures.
Attached
information
None
Precautions/
Remarks
None
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