Omron DEVICENET#05-2003 Operation Manual page 209

Troubleshooting
No. TS indicator status
Communi-
cations Unit
15
ON (red)
(I/O Unit
interface
The TS indicators on the Units
error)
closer to the Communications
Unit are flashing green and the
indicators on the rest of the Units
are lit red.
All I/O Unit TS indicators are lit
red.
All I/O Unit TS indicators are lit
green.
The TS indicators on the Units
closer to the Communications
Unit are flashing green and the
indicators on the rest of the Units
are not lit.
16
Flashing
(green)
(Special I/O
Unit error)
There is a Special I/O Unit with
the TS and U.ERR indicators lit
red.
I/O Units
Flashing (green) ON (red)
OFF
Flashing (green)
ON (green)
Cause
The cable is broken at the
Unit where the TS indica-
tor display changes.
The cable between the
Communications Unit
and the first I/O Unit is
broken.
There is a lot of noise.
The end connector is not
connected.
The cable connected to
the Remote Terminal Unit
I/O Unit interface connec-
tor 1 is broken.
The I/O Unit configuration
changed after the Unit
where the TS indicator
display changed.
At the last Unit where the
green light is flashing,
one of the cables is bro-
ken.
I/O Unit interface connec-
tor 2 are connected at the
Unit where the TS indica-
tor display changed.
A specific error, such no
operating power supply,
has occurred in a Spe-
cial I/O Unit.
Section 7-2
Remedy
After turning OFF the power supply
to the Communications Unit and all
I/O Units, replace the broken cable.
Remove the source of the noise.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, attach the end connector
to the I/O Unit interface connector 2
of the terminal I/O Unit.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, perform a continuity test
on the cable, and replace the bro-
ken cable.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, return to the correct I/O
Unit configuration, and restart the
Communications Unit.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, check the connection sta-
tus of the cable. If the problem per-
sists, replace the cable after turning
OFF the power supply to the Com-
munications Unit and all I/O Units.
After turning OFF the power supply
to the Communications Unit and all
I/O Units, correctly reconnect the
cable.
Check the operating power supply,
and provide the correct power sup-
ply. If the problem persists, replace
the Special I/O Unit in which the
error occurred.
201