Omron CJ1W-DRM21 Operation Manual page 286

9 Troubleshooting and Maintenance
Event name Remote I/O Communications Error
Meaning A timeout occurred in remote I/O communications.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
The master and slaves have different
baud rates.
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
Attached None
information
Precautions/ You can change the event level to the observation level. If you change the level to the observation level, recovery proce-
Remarks dures are not required.
9-56
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Correct the settings so that the mas-
ter and slaves use the same baud
rate.
Refer to the communications specifi-
cations and adjust all of the 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.
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Event code 8475 0000 hex
CJ-series Unit Detection
timing
Error reset Log category
The DeviceNet Unit periodically performs reconnection
processing for slaves that have a remote I/O communica-
tions error. Remote I/O communications will stop, how-
ever, when a communications error occurs and remote I/O
communications are set to stop.
Name
---
Prevention
Set the master and slaves to the
same baud rate.
Refer to the communications specifi-
cations and adjust all of the cables to
suitable lengths.
Connect the communications cable
securely. Check to see if the commu-
nications cable is operating properly.
Connect terminating resistance only
to the ends of the trunk line.
Implement noise countermeasures.
During DeviceNet
communications
System