Omron CJ1W-DRM21 - Page 279

9-49
9 Troubleshooting and Maintenance
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
9-4 Event Logs
9
9-4-3 Error Descriptions
Event name Send Timeout Error Event code 64AC0000 hex
Meaning A send timeout occurred.
Source PLC Function Module Source details CJ-series Unit Detection
timing
When trying to
establish a link or
during DeviceNet
communications
Error attributes Level Minor fault Recovery Automatic recov-
ery
Log category System
Effects User program Continues. Operation The DeviceNet Unit will stop remote I/O communications
and return errors for message send requests wherever
there is a transmission timeout. When the system returns
to normal status from the transmission timeout, the error
display will stop, remote I/O communications will start, and
message processing will return to normal. Remote I/O
communications will not start again after recovery to nor-
mal operation, however, if remote I/O communications are
set to stop when a communications error occurs.
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
There is no slave or other device on
the network.
Add at least one device to the net-
work.
Connect at least one device to the
network.
The same baud rate is not set for all
nodes.
Correct the settings so that all nodes
use the same baud rate.
Set all nodes to the same baud rate.
Communications cable lengths (trunk
line and branch lines) are unsuitable.
Adjust the communications cables to
suitable lengths.
Make sure that the communications
cable lengths are suitable.
A communications cable is discon-
nected or loose.
Connect the communications cable
securely. If the communications cable
is broken, replace it.
Connect the communications cable
securely. Check the communications
cable to see if it is operating properly.
The terminating resistance is some-
where other than the ends of the trunk
line.
Connect terminating resistance only
to the ends of the trunk line.
Connect terminating resistance only
to the ends of the trunk line.
Noise Implement noise countermeasures. Implement noise countermeasures.
There is an error in the CAN control-
ler.
Replace the DeviceNet Unit. None
Attached
information
None
Precautions/
Remarks
None