Siemens SIMOCODE pro Function Manual page 63

Note
H systems and separate subnets
IO devices are connected as redundant units only if the two PROFINET I/O systems of the H
system are in the same subnet. As an alternative, each CPU can be networked with a
different subnet. In this case, the IO devices will always be connected as non-redundant
units.
Note
Shared device function
The system redundancy function is not available when the "Shared Device Function" is used.
Note
Product version of SIMOCODE pro V PN basic unit
System redundancy is supported by product version *E05* and higher of
SIMOCODE pro V PN with firmware version V1.2.
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003
Communication
2.2 PROFINET communication
63