12   Troubleshooting
12 - 22
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
This section describes the errors (events) that can occur and how to troubleshoot them.
The errors (i.e., events) that can occur in the EtherNet/IP Coupler Unit are given on the following pages. 
The following abbreviations are used in the Level column.
12-3-5 Event Codes for Errors and Troubleshooting Procedures
Error Table
Abbreviation Meaning
Maj Major fault level
Prt Partial fault level
Min Minor fault level
Obs Observation level
Info Information level
Event code
Event 
name
Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
00210000 
hex
Bus Con-
troller Error
An internal bus 
error occurred.
• A Unit failed or an I/O com-
munications error occurred 
between the Communica-
tion Coupler Unit and the 
NX Unit.
√ P. 12-27
00220000 
hex
Non-vola-
tile Memory 
Hardware 
Error
An error occurred 
in non-volatile 
memory.
• Non-volatile memory failure √ P. 12-28
10420000 
hex
Non-vola-
tile Memory 
Control 
Parameter 
Error
An error occurred 
in the control 
parameters.
• The power supply to the 
Communications Coupler 
Unit was turned OFF or 
Support Software communi-
cations were disconnected 
while writing the Unit opera-
tion settings was in prog-
ress.
√ P. 12-28
10430000 
hex
Memory 
Corruption 
Detected
Memory corrup-
tion was 
detected.
• Memory corruption was 
detected.
√ P. 12-29
24A00000 
hex
Unit Config-
uration 
Error, Too 
Many Units
The number of 
connected NX 
Units exceeds 
the maximum 
value for the Eth-
erNet/IP Coupler 
Unit.
• More than the maximum 
number of NX Units is con-
nected to the Communica-
tion Coupler Unit.
√ P. 12-30
24A10000 
hex
Unit Config-
uration 
Error, 
Unsup-
ported Con-
figuration
An unsupported 
NX Unit is 
mounted. Or, the 
total byte size of 
all I/O data for the 
connected NX 
Units exceeds 
the predeter-
mined maximum 
value for the Eth-
erNet/IP Coupler 
Unit.
• An unsupported NX Unit 
was detected.
• The total byte size of all I/O 
data for the connected NX 
Units exceeds the predeter-
mined maximum value for 
the Communications Cou-
pler Unit.
√ P. 12-31