9 Troubleshooting
9 - 14
NX-series Communications Interface Units User’s Manual (W540)
Cause and
correction
Assumed cause Correction Prevention
For the NX bus of CPU Units
An error that prevents normal
NX bus communications
o
ccurred in a CPU Unit.
Check the error that occurred in
the
CPU Unit and perform the
required corrections.
Take preventive measures
ag
ainst the error that occurred in
the CPU Unit.
An NX Unit is not mounted prop-
erly.
Mount the NX Units and End
Cover securely
and secure
the
m with End Plates.
Mount the NX Units and End
Co
ver securely and secure them
with End Plates.
The power cable for the Unit
po
wer supply is disconnected,
or the wiring from the Unit
power supply to the NX Units is
incorrect.
Wire the Unit power supply to
the
NX Units securely.
Wire the Unit power supply to the
NX Units securely.
The power cable for the Unit
power supply is broken.
If the power cable between the
Unit power supply and the NX
Units is broken, replace it.
None
The voltage of the Unit power
su
ppl
y is outside the specified
range, or the capacity of the
Unit power supply is insufficient.
Configure the power supply sys-
tem configuration correctly
ac
cord
ing to the power supply
design method.
Configure the power supply sys-
tem configuration correctly
accord
ing to the power supply
design method.
There is a hardware error in an
N
X
Unit.
If the error persists even after
you make the above correction,
replace the NX Unit.
None
For Communications Coupler Units
An error that prevents normal
NX bus communications
occurred in a Communications
Coupler Unit.
Check the error that occurred in
the
Communications Coupler
Unit and perform the required
corrections.
Take preventive measures
ag
ainst the error that occurred in
the Communications Coupler
Unit.
The NX Unit is not mounted
p
roperly.
Mount the NX Units and End
Cover securely and secure
them with End Plates.
Mount the NX Units and End
Co
ver securely and secure them
with End Plates.
The power cable for the Unit
po
wer supply is disconnected.
Or, the wiring from the Unit
power supply to the NX Units is
incorrect.
Correctly wire the Unit power
sup
ply to the NX Units.
Correctly wire the Unit power
supply to the NX Units.
The power cable for the Unit
po
wer supply is broken.
If the power cable between the
Unit power supply and the NX
Units is broken, replace it.
None
The voltage of the Unit power
su
ppl
y is outside the specified
range. Or, the capacity of the
Unit power supply is insufficient.
Correctly configure the power
supply system according to
the
power supply design methods.
Correctly configure the power
supply sy
stem according to the
power supply design methods.
There is a hardware error in the
N
X
Unit.
If the error occurs again even
after you make the above cor-
rection, replace the NX Unit.
None
Attached
information
None
Precautions/
Remarks
None
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