Siemens SINUMERIK MC Commissioning Manual page 68

Safety program of the F-PLC
3.5 Restrictions in the programming languages FBD/LAD
Example of "fully qualified DB access":
Assign a name for the F-DB, e.g. "FData1". Use the names assigned in the declaration of the
F-DB instead of the absolute addresses.
Figure 3-7
Access to instance DBs
You can also access instance DBs of F-FBs with fully qualified access, e.g., for transfer of block
parameters. It is not possible to access static local data in single/multi-instances of other F-FBs.
Note that accessing instance DBs of F‑FBs that are not called in the safety program can cause
the F-CPU to go to STOP mode.
68
Example with fully-qualified access
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB