Omron CJ1W-DRM21 Operation Manual page 279

Event name Send Timeout Error
Meaning A send timeout occurred.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
There is no slave or other device on
the network.
The same baud rate is not set for all
nodes.
Communications cable lengths (trunk
line and branch lines) are unsuitable.
A communications cable is discon-
nected or loose.
The terminating resistance is some-
where other than the ends of the trunk
line.
Noise
There is an error in the CAN control-
ler.
Attached None
information
Precautions/ None
Remarks
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Add at least one device to the net-
work.
Correct the settings so that all nodes
use the same baud rate.
Adjust the communications cables to
suitable lengths.
Connect the communications cable
securely. If the communications cable
is broken, replace it.
Connect terminating resistance only
to the ends of the trunk line.
Implement noise countermeasures.
Replace the DeviceNet Unit.
9 Troubleshooting and Maintenance
Event code 64AC0000 hex
CJ-series Unit Detection
timing
Automatic recov- Log category
ery
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.
Name
---
Prevention
Connect at least one device to the
network.
Set all nodes to the same baud rate.
Make sure that the communications
cable lengths are suitable.
Connect the communications cable
securely. Check the communications
cable to see if it is operating properly.
Connect terminating resistance only
to the ends of the trunk line.
Implement noise countermeasures.
None
When trying to
establish a link or
during DeviceNet
communications
System
9
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