Event name
NX Unit I/O Communications Error
Event code
80200000 hex
Meaning
An I/O communications error occurred in an NX Unit.
Source
Depends on where the Support
Software is connected and the
system configuration.
Source details
NX Unit
Detection tim-
ing
Continuously
Error attrib-
utes
Level
Minor fault
Log category
System
Recovery
For the NX bus of CPU Units
When Fail-soft Operation Is Set to Stop
Reset the error in the NX Bus Function Module.
When Fail-soft Operation Is Set to Fail-soft
Reset error in the NX Unit.
For Communications Coupler Units
When Fail-soft Operation Is Set to Stop
If the errors are detected in the Controller, reset all of the errors in
the Controller.
If the errors are not detected in the Controller, reset errors in the
Communications Coupler Unit and NX Unit.
When Fail-soft Operation Is Set to Fail-soft
Reset errors in Communications Coupler Unit and NX Unit.
Effects
User program
Continues.
Operation
The NX Unit will continue to operate.
Input data: Updating input values stops.
Output data: The output values depend on the
Load Rejection Output Setting.
System-de-
fined varia-
bles
Variable
Data type
Name
None
---
---
Cause and
correction
Assumed cause
Correction
Prevention
For the NX bus of CPU Units
An error that prevents normal NX
bus communications occurred in
a CPU Unit.
Check the error that occurred in
the CPU Unit and perform the re-
quired corrections.
Take preventive measures
against 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 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 power
supply to the NX Units is incor-
rect.
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
supply is outside the specified
range, or the capacity of the Unit
power supply is insufficient.
Configure the power supply sys-
tem configuration correctly ac-
cording to the power supply de-
sign method.
Configure the power supply sys-
tem configuration correctly ac-
cording to the power supply de-
sign method.
There is a hardware error in the
NX Unit.
If the error persists even after
you make the above correction,
replace the NX Unit.
None
9 Troubleshooting
9 - 23
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
9-3 Checking for Errors and T
roubleshooting on the Support Software
9
9-3-4
Meaning of Error
