9 Troubleshooting and Maintenance
9-42
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Error Descriptions
Event name Unit Memory Error Event code 0488 0000 hex
Meaning An error occurred when writing to internal memory where the error history is saved.
Source PLC Function Module Source details CJ-series Unit Detection
timing
At power ON,
Controller reset,
or error history
save
Error attributes Level Minor fault Recovery Cycle the power
supply.
Log category System
Effects User program Continues. Operation Non-volatile memory cannot be written.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
There is a source of noise nearby. Implement noise countermeasures. Use the Controller away from sources
of noise.
Non-volatile memory failure If the above cause does not apply,
replace the Unit.
None
Attached
information
None
Precautions/
Remarks
You can change the event level to the observation level. If you change the level to the observation level, the Recovery
column above will be changed to “Error reset.”
Event name Network Power Error Event code 04890000 hex
Meaning Network power is not being supplied.
Source PLC Function Module Source details CJ-series Unit Detection
timing
Continuously
Error attributes Level Minor fault Recovery Cycle the power
supply.
Log category System
Effects User program Continues. Operation The DeviceNet Unit will stop remote I/O communications
and return errors for message send requests whenever
there is a network power supply error. When the network
power supply returns to normal status, the error display
will stop, the scan will be started, and message process-
ing will return to normal. The scan will not start again after
recovery to normal operation, however, if remote I/O com-
munications are set to stop when a communications error
occurs.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
Communications power is not being
supplied normally from the network.
Check the network power supply and
network cable connections and cor-
rect any errors.
Check to see if the network power
supply and network cables are cor-
rectly wired.
Attached
information
None
Precautions/
Remarks
None
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