Communication
11.3 Communication via PROFINET IO
Drive functions
842 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
PROFINET media redundancy
To increase the availability of PROFINET, you can create a ring topology. If the ring is
interrupted at one point, the data paths between the devices are automatically reconfigured.
Following reconfiguration, the devices can once again be accessed in the resulting new
topology.
To create a ring topology with media redundancy, route the two ends of a line-type
PROFINET topology to a switch which serves as redundancy manager (e.g. a suitable
SCALANCE switch). Closing the linear bus topology is realized using two ports (ring ports) of
the SCALANCE redundancy manager, which monitors the data telegrams in the PROFINET
ring. All other connected PROFINET nodes are redundancy clients.
The Media Redundancy Protocol (MRP) is the standard procedure for media redundancy.
Using this procedure, a maximum of 50 devices can participate in each ring. In the case of
an interrupted cable, data transfer is only briefly interrupted as the system switches over to
the redundant data path.
If a short-term interruption is not permitted, data transfer must be set to IRT High
Performance. The uninterruptible MRRT is automatically set. A SIMOTION controller (or
another suitable controller) is required in this case.
The two integrated PROFINET IO interfaces of the Control Units CU320-2 PN and CU310-2
PN can be configured as redundancy clients.
From a CBE20, only the first two ports are capable of establishing a ring topology. Routing
between the integrated PROFINET IO interfaces and a CBE20 is not possible.
PROFINET system redundancy
11.3.9.1
Thanks to SINAMICS S120 PROFINET Control Unit, the assembly of system-redundant
systems is possible.
Precondition for system-redundant systems is a so-called H-system. The H-system consists
of 2 fault-tolerant controls – master and reserve CPU – which are constantly synchronized
via fiber-optic cables. If one controller fails, the other automatically takes on the job. This
reduces system downtimes.
● SIMATIC controller S7-400H with two PROFINET H-CPUs type 41xH
● SINAMICS S120 PROFINET Control Unit (CU310-2 PN or CU320-2 PN)
● Redundant communication links
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