7-segment display Meaning Troubleshooting
SD Error <n> <n> = single-digit code:
• SD Error 1: System card reader is
not present in HW info
• SD Error 2: Card reader not re‐
sponding; HW problem
• SD Error 3: SD card missing, or
does not contain an ext4 partition
• SD Error 4: fsck (le system check)
failed with incorrigible errors
• SD Error 5: File system linking
failed
A write or read error has occurred on
the SD card.
• Check whether the mechanical write protection (lock) of
the SD card has been activated.
• It is possible that the SD card is defective and must be
replaced.
• Check the SD card using the "Check storage integrity" di‐
agnostics option.
SIGErr=<nn> <nn> = double-digit code:
SIGErr=08: signature le error
No SIEMENS signature was found for
a software component.
Check whether the original CNC software package is installed
and has not been modied.
• Install the original CNC software package.
SIGErr=09: Device certicate period
of validity error
The system time has not been cor‐
rectly set.
Occurs the rst time the device is turned on if the system time
has not yet been set.
Check the settings if the error is permanent.
SIGErr=11: signature le invalid
Software was installed with an unas‐
sociated signature le.
Check whether the original CNC software package is installed
and has not been modied.
• Install the original CNC software package.
All others SIGErr The hardware is possibly defective.
• Contact SIEMENS Technical Support.
unPAC FAIL A problem has occurred when read‐
ing, unzipping or writing the data.
Boot the NCU using the SINUMERIK service system, and check
the partition using the "Check storage integrity" diagnostics
option.
• Contact SIEMENS Technical Support if the diagnostics
check is unsuccessful.
The archive with the CNC software is
possibly corrupt or unreadable.
Reinstall the CNC software if the SD card is OK.
6 point not ashing: Operating system
has crashed where the NCK is no lon‐
ger clocking
Restart the NCU.
Please contact SIEMENS Technical Support (Page 10) if it was not possible to resolve the error.
Diagnostics
9.1 Error messages
NCU 1740
90 Equipment Manual, 10/2021, A5E51087503B AA
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