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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
9-3-4 Error Descriptions
Event name External Test Signal Failure at Safety Input Event code 6522 0000 hex
Meaning An error was detected in test pulse evaluation of the safety input terminals.
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 When safety
input terminal
goes inactive
after cause of
error is removed
Log category System
Effects User program Continues. Operation The safety input terminal retains the safe state until the
error is cleared.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
The positive power supply wire is in
contact with the input signal line.
Check the external wiring. Set the parameters and wire the sys-
tem considering the corrections that
are given on the left.
The input signal lines are shorted.
The external device is faulty. Replace the external device.
Attached
information
Attached information 1: Terminal number
Precautions/
Remarks
None
Event name Discrepancy Error at Safety Input Event code 65230000 hex
Meaning An error was detected in discrepancy evaluation of safety input terminals.
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 When safety
input terminal
goes inactive
after cause of
error is removed
Log category System
Effects User program Continues. Operation The safety input terminal retains the safe state until the
error is cleared.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
There is a ground fault or disconnec-
tion in the input signal line.
Check the external wiring. Set the parameters and wire the sys-
tem considering the corrections that
are given on the left.
The connected device is faulty. Replace the external device.
The setting of the discrepancy time is
not correct.
Correct the setting of the discrepancy
time.
If that does not correct the problem,
use an input filter to set an ON delay
or an OFF delay.
Chattering occurred in the input signal
from the external input device, such
as a safety door.
Attached
information
Attached information 1: Terminal number
Precautions/
Remarks
None