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Network topologies and redundancy
4.2 HSR
4.2
HSR
High-availability Seamless Redundancy Protocol (HSR)
The "High-availability Seamless Redundancy" protocol is a redundancy protocol for Ethernet
networks. It is defined in Part 3 of the IEC 62439 standard. The devices of the SCALANCE
X-200RNA product line support the HSR method. The areas of application of HSR are distributed
real-time applications with high reliability demands that depend on the high availability of the
network. Compared with classic fault-tolerant networks, HSR provides bumpless redundancy.
This redundancy method allows data communication to be maintained without interruption/
reconfiguration time if there are interruptions in the network. Other redundancy procedures
have a reconfiguration time of the network of, for example 200 ms (MRP, 50 nodes in the ring)
or 300 ms (High Speed Redundancy, 50 nodes in the ring) and cannot therefore be used for
substation applications or other applications that require high network availability.
The HSR method has the advantage that the communication redundancy is achieved by the
configuration as a ring. This means there is no need for other standard network components
(switches) within a network. The end devices that use this method are connected to the two
networks via a preceding device or via two integrated device interfaces. This means that the
frame of the end device can be transferred at the same time in both directions of the ring. If a
transmission path is interrupted, the frame arrives its destination via the other path.
The devices of the SCALANCE X-200RNA product line are used to connect end devices without
integrated HSR interfaces to HSR networks.
Note
SCALANCE X204RNA EEC (PRP/HSR)
If you initialize the device as an HSR device, it behaves in exactly the same way as the SCALANCE
X204RNA EEC (HSR).
Which topologies can be implemented?
With the devices of the SCALANCE X-200RNA (HSR) product line, nodes or entire network
segments without HSR capability can be connected to a "High-availability Seamless Redundancy
Protocol" network.
The products with HSR capability of the SCALANCE X-200RNA product line can be used to
implement an integrated solution for network components and protective devices for a
substation and also process application.
You also have the option for a redundant or non-redundant coupling to a PRP network.
The SCALANCE X-200RNA can manage a maximum of 1023 MAC addresses.
Note
Keep to the maximum permitted cable lengths of the devices you are using. You will find the
permitted cable lengths in the technical specifications.
22
Operating Instructions, 04/2022, C79000-G8976-C342-07
SCALANCE X-200RNA
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