Siemens SINUMERIK 840DE sl Commissioning Manual page 1387

3.2 Backup license
Validity of the license key
The license key corresponds to the serial number of the CompactFlash Card. If the
CompactFlash Card is replaced for a SINUMERIK 840D sl, the license key loses its validity
and the system is no longer ready for operation.
This situation can occur for a defective hardware of the system CompactFlash Card.
Application
For the following cases, backup the license key of the CompactFlash Card on a USB storage
medium or on a network drive:
● Software update without license key
● System software error without defective hardware
Note
Replacement CompactFlash Card
The following data are required in order to obtain a valid license key after replacing the system
CompactFlash Card: The serial number of the defective and the new CompactFlash Card.
NCU operating system
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
Service and diagnostics
3.2 Backup license
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