Omron DEVICENET#05-2003 Operation Manual page 208

Troubleshooting
No. Communications
Unit NS indicator
status
10
ON (red)
11
Flashing (red)
12
Flashing (green)
13
ON (green)
No. TS indicator status
Communi-
cations Unit
14
OFF
All I/O Unit TS indicators are not
lit.
200
Causes and Remedies for Communications Unit NS Indicator Errors
Next use the NS indicator to check the status of the Communications Unit,
and then take action in according to the following table.
Cause
The Unit is in Bus Off status.
A Slave already exits with the
same node number as the Com-
munications Unit.
The baud rate does not match that
of the Master Unit.
A timeout occurred in communica-
tions with the Master Unit.
The Master Unit has not been
started correctly.
There is a configuration error in
the Master Unit I/O area.
No error
Causes and Remedies for Communications Unit and I/O Unit TS Indicator
Errors
If there is no error after the MS indicator and NS indicator have been checked,
use the TS indicator of each Unit to check the status of the Communications
Unit and each I/O Unit, and then take action in according to the following
table.
I/O Units
Check the connection status of the DeviceNet commu-
nications cable or the noise status.
Reset the node number so that it is not duplicated.
Reset with the same baud rate as that of the Master
Unit.
After taking the above measures, restart the Communi-
cations Unit. If the problem persists, replace the Com-
munications Unit.
Check the status of the Master Unit.
Check the connection status of the DeviceNet commu-
nications cable or the noise status.
After taking the above measures, restart the Communi-
cations Unit. If the problem persists, replace the Com-
munications Unit.
Check that the Master Unit has started normally.
Check that the number of I/O points for the Master Unit
I/O area and the Communications Unit match.
Proceed to the next item, Causes and Remedies for
Communications Unit and I/O Unit TS Indicator Errors.
Cause
The power supply to the I/
O Unit interface has
shorted.
The current consumption
of the I/O Unit interface
exceeds 0.4 A.
The cable between the
Communications Unit
and the first I/O Unit is
disconnected.
Section 7-2
Remedy
Remedy
Check that the I/O Unit communica-
tions cable has not shorted.
Check that the total current con-
sumption of the communications
power supply for the I/O Unit does
not exceed 0.4 A.
After taking the above measures,
restart the Communications Unit.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, correctly connect the
cable.