Cause and
correction
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 Communication Coupler Unit
and perform the required correc-
tions.
Take preventive measures
against the error that occurred in
the Communication Coupler Unit.
The NX Unit is not mounted
properly.
Mount the NX Units and End
Cover securely and secure them
with End Plates.
Mount the NX Units and End
Cover securely and secure them
with End Plates.
The power cable for the Unit
power supply is disconnected.
Or, the wiring from the Unit pow-
er supply to the NX Units is in-
correct.
Correctly wire the Unit power
supply to the NX Units.
Correctly wire the Unit power
supply to the NX Units.
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
supply 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 system according to the
power supply design methods.
There is a hardware error in the
NX Unit.
If the error occurs again even af-
ter you make the above correc-
tion, replace the NX Unit.
None
Attached in-
formation
None
Precautions/
Remarks
None
9 Troubleshooting
9 - 24
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
