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9 Troubleshooting
NX-series Safety Control Unit User’s Manual (Z930)
9-3 Checking for Errors with the Sysmac Studio
9
9-3-3 Event Codes for Errors and Troubleshooting Proce-
dures
Safety I/O Errors
80300000 hex Safety Process
Data Communi-
cations Timeout
A communica-
tions timeout
occurred in safety
process data
communications
with the Safety
Control Unit.
• A setting is not correct. The
setting of the safety task
period is too short.
• There is excessive noise.
• The Safety CPU Unit or safety
slave entered a status where it
could not continue safety pro-
cess data communications.
• An error or status change
occurred in the Communica-
tions Coupler Unit to which the
Unit is connected, preventing
correct process data commu-
nications.
√ P. 9-39
84F10000 hex NX Bus I/O Com-
munications
Stopped
An error occurred
in I/O communi-
cations between
the Communica-
tions Coupler
Unit and an NX
Unit.
There is a hardware error in the
Communications Coupler Unit or
an NX Unit.
√ P. 9-39
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
05210000 hex Internal Circuit
Error at Safety
Input
A fault was
detected in the
internal circuit for
the safety input
terminal.
• The internal circuit for the
safety input terminal is faulty.
• A memory error or signal error
occurred due to a transient
cause, such as an excessive
noise.
√ P. 9-40
05220000 hex Internal Circuit
Error at Test Out-
put
A fault was
detected in the
internal circuit for
the test output
terminal.
• The internal circuit for the test
output terminal is faulty.
• A memory error or signal error
occurred due to a transient
cause, such as an excessive
noise.
√ P. 9-40
05230000 hex Internal Circuit
Error at Safety
Output
A fault was
detected in the
internal circuit for
the safety output
terminal.
• The internal circuit for the
safety output terminal is faulty.
• A memory error or signal error
occurred due to a transient
cause, such as an excessive
noise.
√ P. 9-41
65200000 hex I/O Power Sup-
ply Voltage Error
An incorrect I/O
power supply
voltage was
detected.
• The input power or output
power is not supplied cor-
rectly.
√ P. 9-41
65210000 hex Output Power
Interrupt Circuit
Error
An error was
detected by the
output power
interruption test.
• The wiring is not correct or
there is a fault in the hard-
ware.
√ P. 9-42
65220000 hex External Test Sig-
nal Failure at
Safety Input
An error was
detected in test
pulse evaluation
of the safety input
terminals.
• The positive power supply
wire is in contact with the input
signal line.
• The input signal lines are
shorted.
• The external device is faulty.
√ P. 9-43
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info