Omron CJ Series Operation Manual page 245

Event name Repeater Unit Communications Error
Meaning An error occurred in Repeater Unit communications.
Source PLC Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
Cable lengths (trunk line and branch
lines) are unsuitable.
A cable is disconnected or loose.
A terminating resistance is not con-
nected. Or, the terminating resistance
is somewhere other than the end of
the trunk line.
Noise
The Repeater Unit does not respond
to communications from the Master
Unit because the Repeater Unit is
faulty, the line is disconnected, or the
communications power is interrupted.
Attached None
information
Precautions/ You can change the event level to the observation level. If you change the level to the observation level, the Recovery
Remarks column above will be changed to "Error reset."
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Refer to the communications specifi-
cations and adjust all of the cables to
suitable lengths.
Connect the cable securely. If the
cable is broken, replace it.
Connect terminating resistance only
to the ends of the trunk line.
Take actions to prevent noise.
Check the disconnected Repeater
Unit and remove the cause of the
problem.
7 Troubleshooting
Event code 84610000 hex
CJ-series Unit Detection
timing
Error reset Log category
Even if this error occurs, remote I/O communications start
for the Master Unit. However, communications are not
possible for any Slave Units that are beyond the Repeater
Unit. The Master Unit waits for the disconnected Repeater
Unit to join the network. When the cause of the error is
removed, the disconnected Repeater Unit and all Slave
Units that are beyond it return to normal operation.
Name
---
Prevention
Refer to the communications specifi-
cations and adjust all of the cables to
suitable lengths.
Connect the cable securely. Check
the cable to see if it is operating prop-
erly.
Connect terminating resistance only
to the ends of the trunk line.
Take actions to prevent noise.
Make sure that the Repeater Unit is
not faulty, lines are not disconnected,
and the communications power is not
interrupted.
During Compo-
Net communica-
tions
System
7
7-17