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9-2
Section
Troubleshooting
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.
No.
TS indicator status
Cause
Remedy
Commu-
nication
Unit
I/O Units
y
13
OFF
All I/O Unit TS indicators are not
lit.
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.
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.
14
ON (red)
(I/O Unit
interface
error)
The TS indicators on the Units
closer to the Communication Unit
are flashing green and the
indicators on the rest of the Units
are lit red.
Flashing (green)
ON (red)
The cable is broken at
the Unit where the TS
indicator display
changes.
(The upline is broken.)
After turning OFF the power
supply to the Communication Unit
and all I/O Units, replace the
broken cable.
All I/O Unit TS indicators are lit
red.
The cable between the
Communication Unit and
the first I/O Unit is
broken. (Upline)
red.
There is a lot of noise.
Remove the source of the noise.
All I/O Unit TS indicators are lit
green.
The end connector is not
connected.
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.
The cable connected to
the Remote Terminal
Unit I/O interface
connector 1 is broken.
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.
The TS indicators on the Units
Flashing (green)
OFF
The I/O Unit
configuration changed
after the Unit where the
TS indicator display
changed.
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.
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.
At the last Unit where
the green light is
flashing, one of the
cables is broken.
(The downline is
broken.)
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.
I/O Unit interface
connector 2 are
connected at the Unit
where the TS indicator
display changed.
After turning OFF the power
supply to the Communication Unit
and all I/O Units, correctly
reconnect the cable.