Siemens SIMATIC ET 200AL, System Manual

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Functions
5.4 Media redundancy (ring topologies)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
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4. Select the ring generated above in the "Ring interconnections" field.
The table below it shows all the PROFINET devices in the ring.
5. Set the media redundancy role for the PROFINET devices in the MRP role column.
Figure 5-39 MRP domain
Automatic MRP configuration
You can also have the media redundancy roles assigned automatically for your PROFINET
devices in the ring.
To have the media redundancy roles assigned automatically, click the "Configure MRP
automatically" button. STEP 7 automatically assigns the media redundancy role for each
device in the ring. After the automatic MRP configuration, you can make modifications to the
media redundancy roles in the "MRP role" column.