Siemens SIMATIC PCS 7 Operating Manual page 21

Calling of SFC 109 with MODE=12
Setting of protection level 3 without password authorization: This means that you cannot lift
the read and write protection set with SFC 109 even when knowing the valid password. If, at
the time of the call up of SFC 109 with MODE=12, an authorized connection is present, the
calling of SFC 109 for this connection remains without effect.
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuring S7F/FH hardware
6.1 Adapting CPU parameters (single F-system)
21