Downgrade Lock; Protection Against Power Failure While Updating Via The Web Server - Siemens SINAMICS S120 Function Manual

Further information
You can find further information on updating the firmware and STARTER project files in
Chapter "Updating the firmware via the web server (Page 764)".
8.26.2

Downgrade lock

Function description
The downgrade lock prevents the downgrade of firmware upgrades that have already been
performed to correct errors.
Note
Upgrade higher firmware versions
Components with higher firmware versions are fully downwards compatible with components
with lower firmware versions. Following a firmware upgrade, a component will also operate
without restrictions with components that have a lower firmware version.
Note
Firmware downgrade of a Control Unit
A higher firmware version is also characterized by having a larger range of functions than a
lower firmware version. If you downgrade a Control Unit from a higher to a lower firmware
version, it is possible that certain functions will no longer be available.
8.26.3

Protection against power failure while updating via the Web server

Function description
From firmware version ≥ V4.6, data on the working partition is duplicated to a backup partition
to guarantee that when upgrading via the web server, data is protected and not lost if the power
fails. This ensures that when updating data on the memory card no data is lost if a fault situation
occurs. Only the system can access this backup partition. The partition is not visible for users.
You can find additional information about saving data in the web server so that is not lost at
power failure in Chapter "Saving data in a non-volatile fashion (Page 730)".
Note
Minimum requirements
You cannot use this function with memory cards of older firmware versions (e.g. V4.5). The
following requirements must be satisfied for working with automatic backup copies:
● A Control Unit with the correct version (see "Reading off CU version (Page 827)")
● An original memory card for firmware version V4.6 or higher
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
8.26 Upgrade the firmware and project
Basic functions
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