Omron NJ Series Troubleshooting Manual page 171

Event code Event name
84740000 hex Bus Off
Detected
84750000 hex Remote I/O
Communica-
tions Error
84760000 hex Remote I/O
Communica-
tions Error
(during Slave
Operation)
84770000 hex Slave COS
Send Failed
048A 0000 hex File
Read/Write
Error
148C0000 hex Invalid Mes-
sage Timer
List Error
NJ-series Troubleshooting Manual (W503)
Meaning Assumed cause
A Bus Off error • The master and slave have dif-
occurred (i.e., com- ferent baud rates.
munications
• Communications cable lengths
stopped because
(trunk line and branch lines) are
there were too
unsuitable.
many communica-
• A communications cable is dis-
tions errors).
connected or loose.
• The terminating resistance is
somewhere other than the ends
of the trunk line.
• Noise
A timeout occurred • The master and slaves have dif-
in remote I/O com- ferent baud rates.
munications.
• Communications cable lengths
(trunk line and branch lines) are
unsuitable.
• A communications cable is dis-
connected or loose.
• The terminating resistance is
somewhere other than the ends
of the trunk line.
• Noise
An error occurred in • The master is not in operation.
remote I/O commu-
• The master and slaves have dif-
nications.
ferent baud rates.
• Communications cable lengths
(trunk line and branch lines) are
unsuitable.
• A communications cable is dis-
connected or loose.
• The terminating resistance is
somewhere other than the ends
of the trunk line.
• Noise
An attempt was • A COS connection to the mas-
made to send COS ter is not open.
data to the master
• A Bus Off state occurred.
using the Slave
• A network power error
COS Send Switch
occurred.
(software switch 2,
• A send timeout occurred.
device variable
*_Sw2SlavCOSSen
dCmd), but the
send failed.
An error occurred • The available capacity on the
when user setup SD Memory Card was insuffi-
data was read from cient to write a file.
an SD Memory
• Write-protection is set on the
Card in the CPU
SD Memory Card when you
Unit or when data
write to a file.
was written as a file
• Noise
to an SD Memory
• The SD Memory Card is dam-
Card.
aged.
• The CPU Unit has failed.
The data in the • The power supply was inter-
message monitor- rupted while writing the mes-
ing timer list is not sage-monitoring timer list to the
correct. non-volatile memory.
3 Error Tables
Level
Maj Prt Min Obs Info
S CJ-series
DeviceNet
Units Opera-
tion Manual for
NJ-series
CPU Unit (Cat.
No. W497)
S U Same as
above.
S Same as
above.
S Same as
above.
U S Same as
above.
U S Same as
above.
Reference
3
3-109