9 Troubleshooting
9 - 40
NX-series Safety Control Unit User’s Manual (Z930)
Safety I/O Errors
Event name Internal Circuit Error at Safety Input Event code 05210000 hex
Meaning A fault was detected in the internal circuit for the safety input terminal.
Source Depends on where the Sysmac Stu-
dio is connected and the system con-
figuration.
Source details NX Unit Detection timing During refreshing
Error attributes Level Minor fault Recovery Cycle the power
supply to the
Unit.
Log category System
Effects User program Continues. Operation The safety input terminal retains the safe state until the
power supply is cycled.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
The internal circuit for the safety input
terminal is faulty.
Cycle the power supply. If the error
occurs again, replace the Unit.
If cycling the power supply restores
normal operation, there may be
excessive noise near the Unit. Imple-
ment noise countermeasures.
A memory error or signal error
occurred due to a transient cause,
such as an excessive noise.
Attached
information
Attached information 1: Terminal number
Precautions/
Remarks
None
Event name Internal Circuit Error at Test Output Event code 0522 0000 hex
Meaning A fault was detected in the internal circuit for the test output terminal.
Source Depends on where the Sysmac Stu-
dio is connected and the system con-
figuration.
Source details NX Unit Detection timing During refreshing
Error attributes Level Minor fault Recovery Cycle the power
supply to the
Unit.
Log category System
Effects User program Continues. Operation The test output terminal retains the safe state until the
power supply is cycled. Also, an External Test Signal Fail-
ure at Safety Input event (65220000 hex) will occur for the
safety input terminal that is the test source of the test out-
put terminal.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
The internal circuit for the test output
terminal is faulty.
Cycle the power supply. If the error
occurs again, replace the Unit.
If cycling the power supply restores
normal operation, there may be
excessive noise near the Unit. Imple-
ment noise countermeasures.
A memory error or signal error
occurred due to a transient cause,
such as an excessive noise.
Attached
information
Attached information 1: Terminal number
Precautions/
Remarks
None
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