13-47
13 Troubleshooting
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
13-5 Event Logs
13
13-5-3 Error Descriptions
Event name Link OFF Error Event code 84E20000 hex
Meaning The Ethernet link status turned OFF.
Source PLC Function Module Source details CJ-series Unit Detection
timing
After link is
established
Error attributes Level Observation Recovery --- Log category System
Effects User program Continues. Operation The EtherNet/IP Unit is offline. Communications are not
possible. Error responses are returned to all communica-
tions requests. Data refreshing with the CPU Unit contin-
ues.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The Ethernet cable is disconnected. Connect the Ethernet cable. Connect the Ethernet cable securely.
Check the cable to make sure that it is
not disconnected.
An Ethernet cable is disconnected or
loose.
Connect the Ethernet cable securely.
If the cable is broken, replace it.
The switching hub power supply is
turned OFF.
Turn ON the power supply to the
switching hub. Replace the switching
hub if it fails.
Do not turn OFF the power supply to
the switching hub.
Baud rate mismatch. Correct the settings so that the same
baud rate is used as for the remote
communications nodes.
Set the same baud rate as for the
remote communications nodes.
Noise Implement noise countermeasures if
there is excessive noise.
Implement noise countermeasures.
Attached
information
None
Precautions/
Remarks
You can change the event level to the minor fault level. If you change the level to the minor fault level, the Recovery col-
umn above will be changed to “Automatic recovery.”
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