Communication
11.2 PROFINET
S7-1200 Programmable controller
954 System Manual, V4.2, 09/2016, A5E02486680-AK
Media Redundancy Protocol (MRP)
The following V4.2 S7-1200 CPUs support operations as an MRP client, but do not fulfill the
MRP manager role:
● CPU 1215C
● CPU 1217C
● CPU 1215FC
The three S7-1200 CPUs all have two PN ports which are required to support the MRP
protocol and the configuration parameters used to initialize MRP client operation.
Media redundancy with ring topologies
In order to increase the network availability of an Industrial Ethernet network with optical or
electrical linear bus topologies, you can convert a linear bus topology to a ring topology by
joining the ends together.
Devices in a ring topology can be IO devices, IO controllers, external switches, and/or the
integrated switches of communication modules.
To set up a ring topology with media redundancy, you need to bring together the two free
ends of a linear bus topology in one device. Closing the linear bus topology to form a ring is
achieved with two ports (ring ports) of a device in the ring. One device of the resulting ring
then takes over the role of the MRP manager. All other devices in the ring are MRP clients.
The ring ports of a device are the ports that establish the connection to the two neighboring
devices in the ring topology. The ring ports are selected and set in the configuration of the
relevant device (is also preset, if applicable).
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