Omron PRT1-COM Operation Manual page 171

Troubleshooting
TS indicator status
No.
Commu-
nication
Unit
13
OFF
All I/O Unit TS indicators are not
lit.
14
ON (red)
Flashing (green)
(I/O Unit
interface
The TS indicators on the Units
error)
closer to the Communication 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. red.
All I/O Unit TS indicators are lit
green.
Flashing (green)
The TS indicators on the Units The TS indicators on the Units
closer to the Communication Unit
are flashing green and the
indicators on the rest of the Units
are not lit.
162
Causes and Remedies for Communication Unit and I/O Unit TS Indicator
Errors
If there is no error after the US indicator and BF indicator have been checked,
use the TS indicator of each Unit to check the status of the Communication Unit
and each I/O Unit, and then take action in according to the following table.
I/O Units
The power supply to the
I/O Unit interface has
shorted or disconnected.
The current consumption
of the I/O Unit interface
exceeds 0.3 A.
The cable is broken at
the Unit where the TS
indicator display
ON (red)
changes.
(The upline is broken.)
The cable between the
Communication Unit and
the first I/O Unit is
broken. (Upline)
There is a lot of noise.
The end connector is not
connected.
The cable connected to
the Remote Terminal
Unit I/O interface
connector 1 is broken.
The I/O Unit
configuration changed
after the Unit where the
OFF
TS indicator display
changed.
At the last Unit where
the green light is
flashing, one of the
cables is broken.
(The downline is
broken.)
I/O Unit interface
connector 2 are
connected at the Unit
where the TS indicator
display changed.
Cause
Check that the I/O Unit
communications cable has not
shorted.
Check that the total current
consumption of the
communications power supply for
the I/O Unit does not exceed
0.3 A.
After taking the above measures,
restart the Communication Unit.
After turning OFF the power
supply to the Communication Unit
and all I/O Units, replace the
broken cable.
Remove the source of the noise.
After turning OFF the power
supply to the Communication 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 Communication Unit
and all I/O Units, perform a
continuity test on the cable, and
replace the broken cable.
After turning OFF the power
supply to the Communication Unit
and all I/O Units, return to the
correct I/O Unit configuration, and
restart the Communication Unit.
After turning OFF the power
supply to the Communication Unit
and all I/O Units, check the
connection status of the cable. If
the problem persists, replace the
cable after turning OFF the power
supply to the Communication Unit
and all I/O Units.
After turning OFF the power
supply to the Communication Unit
and all I/O Units, correctly
reconnect the cable.
Section 9-2
Remedy y