Cause and
correction
[Communications Coupler Unit]
An error occurred in the commu-
nications coupler unit, which pre-
vents the NX bus communica-
tions from being carried out nor-
mally.
Check the error in the communi-
cations coupler unit and try the
solutions specified in Correction.
T
ry the solutions specified in Pre-
vention for the error in the com-
munications 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 connecting the
Unit power supply and the NX
Units is broken, replace the pow-
er cable.
None
The unit power voltage is out of
the supported range, or the unit
power capacity is not sufficient.
Configure the power supply sys-
tem correctly in accordance with
the power supply specifications.
Configure the power supply sys-
tem correctly in accordance with
the power supply specifications.
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
12 Troubleshooting
12 - 36
NX-series Safety Control Unit User's Manual (Z930)
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