6-15
6 Troubleshooting and Maintenance
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
6-5 Even
t L
o
g
s
6
6-
5-3 Err
or D
escriptions
Event name
Receive Queue Overflow
Event code
84C30000 hex
Meaning
The receive 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
received were
handled.
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 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.
Reduce the communications load.
Consider the communications load
(the rate the other devices transmit
messages) and the CPU cycle time.
Attached
information
None
Precautions/
Remarks
None
Event name
Bus Off Event
Event code
84C40000 hex
Meaning
Bus off event EV5 (bus off) has occurred.
Source
PLC function module
Source details
CJ-series Unit
Detection
timing
During CAN com-
munications
Error attributes
Level
Minor Fault
Recovery
Disable and
enable the com-
munication (EV3)
with the
*_EnblCANCom
m
device vari-
able.
Log category
System
Effects
User program
Continues
Operation
None
System-defined
variables
Variable
Data type
Name
None
---
---
Cause and
correction
Assumed cause
Correction
Prevention
A bus off condition was detected.
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
Implement the preventative measures
for each error.
Attached
information
None
Precautions/
Remarks
None
Содержание CJ1W-CORT21
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Страница 116: ...5 Communications Timing 5 10 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 134: ...6 Troubleshooting and Maintenance 6 18 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 140: ...Appendices A 6 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517...
Страница 141: ...Index 1 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 I Index...
Страница 144: ...Index 4 CJ series User Defined CAN Unit Operation Manual for NJ series CPU Unit W517 Index...