Siemens SIMOCODE pro Function Manual page 64

Communication
2.2 PROFINET communication
Possible topologies
You can also combine PROFINET-based system redundancy with other PROFINET
functions.
System redundancy with media redundancy:
Figure 2-22
①
S7-400H system
②
SCALANCE X400 (non-redundant IO device)
③
SIMOCODE pro V PN (GP) (non-redundant/redundant-system IO device)
④
SIMOCODE pro V PN (GP) (MRP, non-redundant/redundant-system IO device)
Note
Response monitoring time of IO devices
RT communication is interrupted (station failure) if the reconfiguration time setting of the ring
is higher than the response monitoring time setting of the IO devices.
For this reason, make sure that the response monitoring time of the IO devices is set to a
high enough value. This also applies to IO devices configured with MRP outside the ring.
64
Sample configuration for system redundancy with MRP
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003