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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
Program Execution 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. 9-21
84F00000 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. 9-30
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
55000000 hex Division by Zero Division by zero
was detected.
The divisor is zero. √ P. 9-22
55010000 hex Cast Error A casting error
was detected.
A value was input that exceeded
the range of the receiving vari-
able.
√ P. 9-22
55020000 hex MUX Error An MUX instruc-
tion error was
detected.
The value of the selection input
(K) to the MUX instruction is not
correct.
√ P. 9-23
74A00000 hex SF_Antivalent
Error
An error was
detected in exe-
cution of a safety
function block.
Refer to information on the diag-
nostic code that is given for
attached information 1 in the
NX-series Safety Control Unit
Instructions Reference Manual
(Cat. No. Z931)
√ P. 9-23
74A10000 hex SF_EDM Error An error was
detected in exe-
cution of a safety
function block.
Refer to information on the diag-
nostic code that is given for
attached information 1 in the
NX-series Safety Control Unit
Instructions Reference Manual
(Cat. No. Z931)
√ P. 9-24
74A20000 hex SF_EmergencySt
op Error
An error was
detected in exe-
cution of a safety
function block.
Refer to information on the diag-
nostic code that is given for
attached information 1 in the
NX-series Safety Control Unit
Instructions Reference Manual
(Cat. No. Z931)
√ P. 9-24
74A30000 hex SF_EnableSwitc
h Error
An error was
detected in exe-
cution of a safety
function block.
Refer to information on the diag-
nostic code that is given for
attached information 1 in the
NX-series Safety Control Unit
Instructions Reference Manual
(Cat. No. Z931)
√ P. 9-24
74A40000 hex SF_Equivalent
Error
An error was
detected in exe-
cution of a safety
function block.
Refer to information on the diag-
nostic code that is given for
attached information 1 in the
NX-series Safety Control Unit
Instructions Reference Manual
(Cat. No. Z931)
√ P. 9-25
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
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