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6 Troubleshooting and Maintenance
6-14
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
Error Descriptions
Event name
Network Power Error
Event code
04C60000 hex
Meaning
CAN network power is insufficient.
Source
PLC function module
Source details
CJ-series Unit
Detection
timing
During CAN com-
munications
Error attributes
Level
Minor Fault
Recovery
Cycle the power
supply
Log category
System
Effects
User program
Continues
Operation
CAN communications are stopped
System-defined
variables
Variable
Data type
Name
None
---
---
Cause and
correction
Assumed cause
Correction
Prevention
Communications power is not being
supplied sufficiently
Check the wiring of the network
power and the network cable and cor-
rect the mistake
Check that the network power and the
network cable are wired correctly
Attached
information
None
Precautions/
Remarks
None
Event name
Send Queue Overflow
Event code
84C20000 hex
Meaning
The send queue was overflowed
Source
PLC function module
Source details
CJ-series Unit
Detection
timing
During CAN com-
munications
Error attributes
Level
Observation
Recovery
All messages to
be sent fit in the
send queue.
Log category
System
Effects
User program
Continues
Operation
Some messages will be discarded
System-defined
variables
Variable
Data type
Name
None
---
---
Cause and
correction
Assumed cause
Correction
Prevention
If the processing capacity of the unit
exceeds the message rate, mes-
sages are discarded when the send
queue is full (overflowed).
The send queue was full already
when sending the message.
Reduce the communications load.
Consider the communications load
and the rate the output buffers
change state.
Attached
information
None
Precautions/
Remarks
None
Summary of Contents for CJ1W-CORT21
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Page 140: ...Appendices A 6 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Page 141: ...Index 1 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 I Index...
Page 144: ...Index 4 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 Index...