Siemens SIMATIC RF185C Operating Instructions Manual page 31

Figure 5-3
Figure 5-4
Media redundancy
Media redundancy is a function that ensures network and system availability. Redundant
transmission links in the MRP topology ensure that an alternative communication path is
made available if a transmission link fails. To make this possible you need to configure the
communication modules as a client of the Media Redundancy Protocol (MRP) in STEP 7 (Basic
/ Professional).
MRP is part of PROFINET standardization according to IEC 61158.
Setup of an MRP ring topology
To set up an MRP ring topology with media redundancy, you must join both free ends of a
line topology in the same device. The closing of the line topology to form a ring is via two
network ports of one of the devices (ring ports). The communication modules can be
integrated as clients in an MRP ring topology via the network ports "X1P1R" and "X1P2R".
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 03/2022, C79000-G8976-C512-04
Configuration graphic of a star topology
Configuration graphic of a ring topology
Connection
5.1 Network topology
31