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The MRP (media redundancy protocol) is a data network protocol that allows rings of Ethernet switches to overcome any single failure with recovery time much faster than achievable with Spanning Tree Protocol.

CODESYS FAQ > How to enable MRP (media redundancy protocol) > image-2023-6-28_17-22-17.png

Source: profinet.com - PROFINET SystemDescription

The MRP is more related to the slaves (and used switches).
→ make sure that the Profinet Slave does support this option!

How to:

Add all the slaves to the PN-Controller
Open the PN-Controller and open the Tab 'Topology'.
Configure the connected ports, so that a ring topology is set.
Open the TAB Media Redundancy, and set the MRP configuration for the slaves / controller

See also....

Our Codesys Online Help (OLH) on Media Redundancy in general, and Controller, Media Redundancy in particular.