Siemens sinamics dcp - 7.6.6 Media redundancy

Operation
7.6 Communication via PROFINET IO
SINAMICS DCP
270 Operating Instructions, 09/2019, A5E34382853K
7.6.6 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 2 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: This is the reason that the switchover is not bumpless (200 ms).
If a brief interruption is not permitted, then you have the following options
● Correspondingly set the failure monitoring time in the hardware configuration to more
than 200 ms.
or
● Set the data transfer to IRT High Performance.
The uninterruptible MRRT is automatically set. A SIMOTION controller (or another suitable
controller) is required in this case.
From a CBE20, only the first two ports are capable of establishing a ring topology.
Note
In order to use the ring topology, the GSDML
file version V2.3 must be installed.
This file can be found, for example, on the memory card as
"
\SIEMENS\SINAMICS\DATA\CFG\PNGSD.ZIP".
Configuring media redundancy
The ring topology is configured by appropriately configuring the participating devices
individually in STEP 7.