Siemens Sinumerik 840D sl Function Manual page 336

DNC IFC SINUMERIK - Downloading NC Data via a Network (FBDN2)
5 Configuration file
Type of login
This parameter specifies the procedure to start DNC IFC SINUMERIK.

No login dialog (default setting) (0):
DNC IFC SINUMERIK is started with the access entered in User and
Password. No other login is possible.

Login dialog (1):
The user must log in with name and password in a Login dialog when starting
DNC IFC SINUMERIK.

Login via protection level (2):
DNC IFC SINUMERIK is started with the user specified via Assignment of
users to protection levels of the current SINUMERIK protection level. A DNC
user with certain rights, which can also be adapted in the user management of
DNC Admin, is assigned to each protection level.

Login via protection level or Login dialog (3)
The login to DNC IFC SINUMERIK is performed as with the Login via
protection level (2), however a Login dialog appears if a user
has not been assigned or the user is not in the DNC user administration.
After a successful login, the softkey Logout is displayed so that the user can be
changed.
Extract from the configuration file:
Section[USER]
Login = 0
FBDN2/5-54
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Motion Control Information System DNC (FBDN) - 04/10 Edition
05.07