The type of connecting cable determines the BusAdapter required for connecting the distributed
I/O.
Note
Strain relief of the bus cables
Make sure to secure the bus cables by installing an appropriate strain relief. Refer to the
installation guidelines of the manufacturer.
PROFINET IO loop-through
Two port switches are integrated into all BusAdapters of the ET 200SP HA. These switches allow
you to loop-through the PROFINET IO system from one station to the next.
Number of media interfaces
Due to dierences in runtime, avoid a network structure in which there are more than four
interfaces between electrical and optical media in a PROFINET IO system between the CPU and
any IO device.
Example of a recommended PROFINET IO system setup (Page 14)
Example of a PROFINET IO system setup that is not recommended (Page 14)
4.3 Examples for the number of media interfaces
4.3.1 Example of a recommended PROFINET IO system setup
Example
CPU > Media Interface > IO Device > IO Device > Media Interface > Media Interface > IO Device
> Media Interface > IO Device
4.3.2 Example of a PROFINET IO system setup that is not recommended
Example
CPU > Media Interface > Media Interface > IO Device > > Media Interface > Media Interface
> IO Device > > Media Interface > Media Interface > IO Device
Installation
4.3 Examples for the number of media interfaces
BusAdapter for Distributed I/O
14 Equipment Manual, 10/2021, A5E39261458-AC
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