Omron CJ1W-DRM21 Operation Manual page 288

9 Troubleshooting and Maintenance
Event name Slave COS Send Failed
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
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
A COS connection to the master is
not open.
A Bus Off state occurred.
A network power error occurred.
A send timeout occurred.
Attached None
information
Precautions/ None
Remarks
Event name File Read/Write Error
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
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
The available capacity on the SD
Memory Card was insufficient to write
a file.
Write-protection is set on the SD
Memory Card when you write to a file.
Noise
The SD Memory Card is damaged.
The CPU Unit has failed.
Attached None
information
Precautions/ You can change the event level to the minor fault level. If you change the level to the minor fault level, the Recovery col-
Remarks umn above will be changed to "Error reset."
9-58
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Open a COS connection to the mas-
ter.
Remove the cause of the Bus Off
error.
Remove the cause of the power sup-
ply error.
Remove the cause of the send time-
out.
Source details
Observation Recovery
Continues. Operation
Data type
---
Correction
Replace the SD Memory Card for one
with sufficient available capacity. Or,
delete unnecessary files from the SD
Memory Card.
Remove write-protection from the SD
Memory Card.
Implement noise countermeasures.
Replace the SD Memory Card.
Replace the CPU Unit.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Event code 8477 0000 hex
CJ-series Unit Detection
timing
Error reset Log category
COS transmissions are not possible.
Name
---
Prevention
When you perform COS communica-
tions, open a COS connection
between the master and slave.
Take measures to prevent the errors
from occurring again.
Event code 048A 0000 hex
CJ-series Unit Detection
timing
--- Log category
Not affected.
Name
---
Prevention
Use an SD Memory Card with suffi-
cient available capacity when you
save files to it.
Disable write-protection on the SD
Memory Card before you save the file
to the SD Memory Card.
Implement noise countermeasures.
None
None
During DeviceNet
communications
System
When SD Mem-
ory Card backup
is executed
System