7SR21 & 7SR22 - Installation Guide
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6.7.3 HSR – High Availability Seamless Redundancy Protocol
The HSR redundancy protocol according to the IEC 62439-3 standard is based on double transmission of
message frames over ring-topology networks in both directions. In the case of an error, the message frame will be
transmitted without any delay. No reconfiguration time is necessary for the network.
HSR needs to be enabled on the device within Reydisp Manager (See Reydisp Manager user guide). Network
rings with up to 50 devices is possible.
Figure: 6.7.3-1 HSR Ethernet Network Ring Configuration
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