Siemens Sinamics S120 Function Manual page 781

7. Left click on "Activate".
8. Write protection is now activated. In the expert list you can recognize that write protection
In order to permanently transfer your setting, after changing write protection, you must carry
out the "RAM to ROM" data save operation.
NOTICE
Know-how protection with active write protection
If write protection is active, the know-how protection setting cannot be changed.
Note
Access via fieldbus
In the factory setting, in spite of write protection, parameters can be changed via fieldbuses
with acyclic access. If write protection should also be active for access operations via
fieldbuses, then in the expert list, you must set p7762 to 1.
Deactivating write protection
Deactivating write protection works in exactly the same way as the activation. The difference
is that you must click on "Deactivate" instead of "Activate". The hatching in the expert list
disappears after deactivation. The parameters can be set again.
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Figure 12-27 Activating write protection
is active by the fact that the entry fields of all adjustable parameters are shown with gray
shading.
Basic information about the drive system
12.14 Write and know-how protection
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