Siemens SIMATIC PROFINET Function Manual page 155

You can configure each MRP instance separately.
The following figure shows the two MRP instances in the manager (PROFINET interface of
the switch). Here in the example, MRP instance 1 checks whether the devices in the MRP
domain "mrpdomain-1" can be reached. The MRP instance 2 is responsible for monitoring
the devices of the MRP domain "mrpdomain-2".
Figure 5-41 Setting media redundancy for multiple rings
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG
5.4 Media redundancy (ring topologies)
Functions
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