Error Descriptions - Omron CJ1W-DRM21 Operation Manual

9 Troubleshooting and Maintenance

Error Descriptions

Event name Unit Memory Error
Meaning An error occurred when writing to internal memory where the error history is saved.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
There is a source of noise nearby.
Non-volatile memory failure
Attached None
information
Precautions/ You can change the event level to the observation level. If you change the level to the observation level, the Recovery
Remarks column above will be changed to "Error reset."
Event name Network Power Error
Meaning Network power is not being supplied.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Communications power is not being
supplied normally from the network.
Attached None
information
Precautions/ None
Remarks
9-42
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Implement noise countermeasures.
If the above cause does not apply,
replace the Unit.
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Check the network power supply and
network cable connections and cor-
rect any errors.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Event code 0488 0000 hex
CJ-series Unit Detection
timing
Cycle the power Log category
supply.
Non-volatile memory cannot be written.
Name
---
Prevention
Use the Controller away from sources
of noise.
None
Event code 0489 0000 hex
CJ-series Unit Detection
timing
Cycle the power Log category
supply.
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.
Name
---
Prevention
Check to see if the network power
supply and network cables are cor-
rectly wired.
At power ON,
Controller reset,
or error history
save
System
Continuously
System