8 Troubleshooting
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NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
This section describes the information that occurs on the Analog Input Units and Analog Output Units.
*6. Refer to the appendices of the troubleshooting manual for the connected CPU Unit or Industrial PC for the applicable
range of the HMI Troubleshooter.
Error Descriptions
Event name Non-volatile Memory Hardware Error Event code 0020 0000 hex
Meaning An error occurred in non-volatile memory.
Source Depends on where the Support
Software is connected and the
system configuration.
Source details NX Unit Detection
timing
When power is
turned ON to
the NX Unit
Error
attributes
Level Minor fault Log category System
Recovery For the NX bus of CPU Units
Cycle the power supply to the Unit or restart the NX bus.
For Communications Coupler Units
Cycle the power supply to the Unit or restart the Slave Terminal.
If the errors are detected in the Controller, reset all of the errors in the Controller.
Effects
User program
Continues. Operation I/O refreshing for the NX Unit stops. Messages can-
not be sent to the NX Unit.
Sys-
tem-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
Non-volatile memory failure. For the NX bus of CPU Units
Cycle the power supply to the Unit
or restart the NX bus. If the error
persists even after you make the
above correction, replace the rele-
vant NX Unit.
For Communications Coupler
Units
Cycle the power supply to the Unit
or restart the Slave Terminal. If the
error persists even after you make
the above correction, replace the
relevant NX Unit.
None
Attached
information
None
Precautions/
Remarks
None
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