9 Troubleshooting
9 - 10
NX-series Digital I/O Unit User’s Manual (W521)
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 Sysmac
Studio is connected and the sys-
tem configuration.
Source details NX Unit Detection
timing
When power is
turned ON to
the NX Unit
Error
attributes
Level Minor fault Recovery Restart the
Slave Terminal
and then reset
all errors in
Controller.
Log category System
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 Replace the NX Unit. None
Attached
information
None
Precautions/
Remarks
None