Siemens SIMATIC ET 200SP HA System Manual page 24

Plant planning
4.1 Topology
Network
All IO devices connected via switches are located in one and the same network. All IO devices
in a network can communicate directly with one another.
The subnet mask is identical for all IO devices in the same network.
A network is physically limited by a router.
Note
If IO devices are to communicate with one another across network boundaries, you must
configure the router in such a way that it permits this communication.
The communication from PROFINET IO functions exclusively within a network. You have the
option of connecting various PROFINET IO networks via PN/PN coupler.
Additional information
You can find more detailed information in the SIMATIC NET manual Communication with
SIMATIC (https://support.industry.siemens.com/cs/ww/en/view/1254686).
You should also read the PROFINET Installation Guideline from the PROFIBUS User
Organization (http://www.profibus.com/download/).
You can find basic information in the manual SIMATIC NET Twisted Pair and Fiber Optic
Networks (https://support.industry.siemens.com/cs/ww/en/view/8763736).
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ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD