Siemens SINAMICS S120 Function Manual page 928

Basic information about the drive system
12.14 Write and know-how protection
6. Call the shortcut menu "Write protection drive unit > Activate".
Note
Know-how protection with active write protection
If write protection is active, the know-how protection setting cannot be changed.
Note
Access via fieldbus
Per default, in spite of write protection, parameters can be changed via fieldbusses with
acyclic access. If write protection should also be active for access operations via
fieldbusses, then in the expert list, you must set p7762 to 1.
926
Figure 12-27 Activating write protection
Write protection is now activated. In the expert list you can recognize that write protection
is active by the fact that the entry fields of all adjustable parameters are shown with gray
shading.
In order to permanently transfer your setting, after changing write protection, you must
carry out the "RAM to ROM" data save operation.
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions