Connection
5.1 Network topology
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 04/2020, C79000-G8976-C512-03
29
With a line/series topology, remember that if the communication connection of a
communication module to the controller is interrupted, the communication connection to all
downstream communication modules is also interrupted.
Figure 5-3 Configuration graphic of a star topology
Figure 5-4 Configuration graphic of a ring topology
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.
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