Omron CJ1W-CORT21 Operation Manual page 131

Event name Receive Queue Overflow
Meaning The receive queue was overflowed
Source PLC function module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
If the message rate exceeds the
processing capacity of the unit, mes-
sages are discarded when the receive
queue is full (overflowed).
The receive queue was full already
when receiving the message.
Attached None
information
Precautions/ None
Remarks
Event name Bus Off Event
Meaning Bus off event EV5 (bus off) has occurred.
Source PLC function module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
A bus off condition was detected.
Attached None
information
Precautions/ None
Remarks
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
Source details
Observation Recovery
Continues Operation
Data type
---
Correction
Reduce the communications load.
Source details
Minor Fault Recovery
Continues Operation
Data type
---
Correction
Check the following:
• Matching device baud rates
• Proper cable lengths
• Broken or loose cables
• Installation of terminators at both
ends of the lines
• Excessive noise
6 Troubleshooting and Maintenance
Event code 84C30000 hex
CJ-series Unit Detection
timing
All messages Log category
received were
handled.
Some messages will be discarded
Name
---
Prevention
Consider the communications load
(the rate the other devices transmit
messages) and the CPU cycle time.
Event code 84C40000 hex
CJ-series Unit Detection
timing
Disable and Log category
enable the com-
munication (EV3)
with the
*_EnblCANCom
m device vari-
able.
None
Name
---
Prevention
Implement the preventative measures
for each error.
During CAN com-
munications
System
6
During CAN com-
munications
System
6-15