Backing up data and series commissioning
9.5 Write and know-how protection
Converter with control units CU250D-2
268 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Points to note about restoring the factory settings
If you select "Reset to factory settings" using the button when write protection is active,
the following confirmation prompt opens.
The confirmation prompt is not issued, if you select another way to restore the factory
setting, e.g. using the expert list.
Note
Points to note regarding CAN, BACnet and MODBUS
Using these bus systems, parameter factory settings can be changed despite active write
protection. S
o that write protection is also active when accessing via these fieldbuses, you
must additionally set p7762 to 1.
This setting is only possible via the expert list.
Exceptions to write protection
Some functions are excluded from write protection, e.g.:
● Activating/deactivating write protection (p7761)
● 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".
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