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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 MUX Error Event code 55020000 hex
Meaning An MUX instruction error was detected.
Source Depends on where the Sysmac Stu-
dio is connected and the system con-
figuration.
Source details NX Unit Detection timing In DEBUG mode
(RUN) or RUN
mode
Error attributes Level Minor fault Recovery Automatic recov-
ery
Log category System
Effects User program Continues. Operation The Safety CPU Unit executes NX bus communications
but execution of the user program stops. (All I/O data will
remain at 0.)
System-defined
variables
Variable Data type Name
None None None
Cause and cor-
rection
Assumed cause Correction Prevention
The value of the selection input (K) to
the MUX instruction is not correct.
Correct the program so that the value
of the selection input (K) to the MUX
instruction is in range. Perform the
following corrections according to the
operating mode of the Safety CPU
Unit.
• RUN mode: Change to PROGRAM
mode and transfer the corrected
user program.
• DEBUG mode (RUN): Change to
PROGRAM mode and transfer the
corrected user program.
Program operation considering the
corrections that are given on the left.
Attached
information
Attached information 1:
0x01000ADD: The value of the selection input (K) is negative.
0x01000ADE: The value of the selection input (K) exceeded the upper limit of the selection range.
Precautions/
Remarks
The Safety CPU Unit executes NX bus communications but execution of the user program stops. (All I/O data will
remain at 0.)
Event name SF_Antivalent Error Event code 74A0 0000 hex
Meaning An error was detected in execution of a safety function block.
Source Depends on where the Sysmac Stu-
dio is connected and the system con-
figuration.
Source details NX Unit Detection timing In DEBUG mode
(RUN) or RUN
mode
Error attributes Level Minor fault Recovery Implement the
correction.
Log category System
Effects User program Continues. Operation The Unit continues to operate.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
Refer to information on the diagnostic
code that is given for attached infor-
mation 1 in the NX-series Safety Con-
trol Unit Instructions Reference
Manual (Cat. No. Z931).
Implement the correction for the rele-
vant cause of the diagnostic code that
is given for attached information 1.
Program operation considering the
corrections that are given on the left.
Attached
information
Attached information 1: Diagnostic code
Precautions/
Remarks
None
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