Omron CJ1W-DRM21 Operation Manual page 287

Event name Remote I/O Communications Error (during Slave Opera-
tion)
Meaning An error 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 is not in operation.
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/ None
Remarks
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Check to see if the master is operat-
ing normally. If it is not, investigate the
cause, and then perform corrective
actions.
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 communi-
cations 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.
9 Troubleshooting and Maintenance
Event code 84760000 hex
CJ-series Unit Detection
timing
Error reset Log category
Outputs will be retained or cleared according to the set-
tings if there are output words.
Name
---
Prevention
Check to make sure the master is
operating normally.
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
9
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