Siemens SINUMERIK 840DE sl Commissioning Manual page 1325

Rules relating to the password structure
The following rules must be observed when assigning a new password:
● Permissible (and specified) characters include lowercase letters, uppercase letters,
numbers and special characters.
● The password must have a minimum length of 6 characters. For each missing character
category (lowercase letters, uppercase letters, numbers and special characters), the
minimum length is extended by two characters.
Example: As a consequence, a password comprising only uppercase letters must be 12
characters long.
● It is not permissible that the password contains too many identical characters
● It is not permissible that the password has any similarity to the user name, the computer
name and the old password (e.g. write the password backwards, interchange uppercase/
lowercase letters).
If this rule is not complied with, then "too weak" message is output – and the old password
remains unchanged.
Changing the password
You can only change the user password with which you used to login; this means that if you
wish to change the passwords of all default users, then you must login with the particular login
one after the other.
Procedure:
1. Log into the basic NCU system (Linux) with user name and password.
2. Enter the "passwd" command.
3. Follow the instructions to enter the old, previous password.
4. Enter a new password and repeat this to confirm the password.
5. The new password is valid once all of the entries are correct. Any deviation means that the
dialog is exited, and the old password remains unchanged and valid.
NCU operating system
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
System settings
1.1 Delivery condition of the system
7