Siemens sinamics G120 Operating Instructions Manual page 369

Exceptions to write protection
Some functions are excluded from write protection, e.g.:
● Activating/deactivating write protection
● Changing the access level (p0003)
● Saving parameters (p0971)
● Safely removing the memory card (p9400)
● Restoring the factory setting
● Importing settings from an external data backup, e.g. upload from a memory card to the
converter.
The individual parameters that are excluded from the write protection, can be found in the
List Manual in Chapter "Parameters for write protection and protection of know-how".
Note
Write protection for multimaster fieldbus systems
When using multimaster fieldbus systems (e.g. CAN Bus, BACnet), parameters can be
changed in spite of an active write protection. So that write protection is also active when
accessing via these fieldbuses, you must additionally set p7762 to 1.
In STARTER, this setting is only possible via the expert list.
Converter with CU250S-2 Control Unit
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Backing up data and series commissioning
7.5 Write and know-how protection
369