Siemens SIMOCODE pro Function Manual page 60

Communication
2.2 PROFINET communication
PN/IO with non-redundant I/Os
The following diagram illustrates an example of a topographical configuration with one
switch. Two IO devices are connected as non-redundant units and the other three IO devices
as redundant-system units.
Figure 2-18
①
S7-400H system
②
SCALANCE (e.g. X400)
③
SIMOCODE pro as a redundant IO device
④
SIMOCODE pro as a non-redundant IO device
Maximum number of IO devices
You can connect a maximum number of 256 IO devices to the two integrated PN/IO
interfaces. The station numbers range from 1 to 256 and must be unique at both the PN/IO
interfaces, i.e. they must not be assigned to a station more than once.
60
S7-400 H system with redundant and non-redundant I/Os
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003