9 Troubleshooting and Maintenance
9-58
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Event name Slave COS Send Failed Event code 8477 0000 hex
Meaning An attempt was made to send COS data to the master using the Slave COS Send Switch (software switch 2, device
variable *_Sw2SlavCOSSendCmd), but the send failed.
Source PLC Function Module Source details CJ-series Unit Detection
timing
During DeviceNet
communications
Error attributes Level Minor fault Recovery Error reset Log category System
Effects User program Continues. Operation COS transmissions are not possible.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
A COS connection to the master is
not open.
Open a COS connection to the mas-
ter.
When you perform COS communica-
tions, open a COS connection
between the master and slave.
A Bus Off state occurred. Remove the cause of the Bus Off
error.
Take measures to prevent the errors
from occurring again.
A network power error occurred. Remove the cause of the power sup-
ply error.
A send timeout occurred. Remove the cause of the send time-
out.
Attached
information
None
Precautions/
Remarks
None
Event name File Read/Write Error Event code 048A 0000 hex
Meaning An error occurred when user setup data was read from an SD Memory Card in the CPU Unit or when data was written
as a file to an SD Memory Card.
Source PLC Function Module Source details CJ-series Unit Detection
timing
When SD Mem-
ory Card backup
is executed
Error attributes Level Observation Recovery --- Log category System
Effects User program Continues. Operation Not affected.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The available capacity on the SD
Memory Card was insufficient to write
a file.
Replace the SD Memory Card for one
with sufficient available capacity. Or,
delete unnecessary files from the SD
Memory Card.
Use an SD Memory Card with suffi-
cient available capacity when you
save files to it.
Write-protection is set on the SD
Memory Card when you write to a file.
Remove write-protection from the SD
Memory Card.
Disable write-protection on the SD
Memory Card before you save the file
to the SD Memory Card.
Noise Implement noise countermeasures. Implement noise countermeasures.
The SD Memory Card is damaged. Replace the SD Memory Card. None
The CPU Unit has failed. Replace the CPU Unit. None
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 “Error reset.”
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