PROFINET
8.7 Media redundancy
S7-400H
104 System Manual, 03/2012, A5E00267695-11
8.7 Media redundancy
Media redundancy is a function that ensures network and system availability. Redundant
transmission links in a ring topology ensure that an alternative communication path is always
available if a transmission link fails.
You can enable the media redundancy protocol (MRP) for IO devices, switches, and CPUs
with PROFINET interface V6.0 or higher. MRP is a component of PROFINET
standardization to IEC 61158.
Installing a ring topology
To set up a ring topology with media redundancy, you must join both free ends of a line
network topology in the same device. You join the line topology to form a ring via two ports
(ring ports, port ID "R") of a device connected to the ring. Specify the ring ports in the
configuration data of the relevant device.
Topology
You can also combine system redundancy under PROFINET with other PROFINET
functions.
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