9 Troubleshooting
9 - 14
NX-series Safety Control Unit User’s Manual (Z930)
The errors (events) that can occur in the Safety I/O Units are listed in the following tables.
System Errors
Communications Errors
Safety I/O Units
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
05200000 hex System Error A hardware error
was detected
during self-diag-
nosis of the hard-
ware.
• Hardware has failed.
• A memory error occurred due
to a transient cause, such as a
software error or excessive
noise.
√ P. 9-36
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
35210000 hex Safety Process
Data Communi-
cations Not
Established -
Incorrect Unit
Parameter Error
Safety process
data communica-
tions was not
established with
the Safety CPU
Unit.
• The model or safety I/O termi-
nal settings are not correct.
√ P. 9-36
35230000 hex Safety Process
Data Communi-
cations Not
Established,
Incorrect FSoE
Slave Address
Error
Safety process
data communica-
tions was not
established with
the Safety CPU
Unit because of
an incorrect
FSoE slave
address.
• The setting of the FSoE slave
address in the safety process
data communications settings
is different from the setting in
the Unit.
√ P. 9-37
35240000 hex Safety Process
Data Communi-
cations Not
Established,
Incorrect Frame
Error
Safety process
data communica-
tions was not
established with
the Safety CPU
Unit because an
incorrect frame
was received.
• An incorrect frame was
received in safety process
data communications.
• There is excessive noise.
√ P. 9-37
80200000 hex NX Unit I/O Com-
munications Error
An I/O communi-
cations error
occurred
between the
Communications
Coupler Unit and
the NX Unit.
• The NX Unit is not mounted
properly.
• The power cable for the Unit
power supply is disconnected.
Or, the wiring from the Unit
power supply to the NX Units
is incorrect.
• The power cable for the Unit
power supply is broken.
• The voltage of the Unit power
supply is outside the specified
range. Or, the capacity of the
Unit power supply is insuffi-
cient.
• There is a hardware error in
the NX Unit.
√ P. 9-38