The choice between the HSR and PRP redundancy protocols depends on the required functionality, cost and complexity.
The self-healing Ethernet ring solution enables a cost-efficient communication ring controlled
by a managed switch with standard Rapid Spanning Tree Protocol (RSTP) support.
The managed switch controls the consistency of the loop,
routes the data and corrects the data flow in case of a communication switch-over.

The relays in the ring topology act as unmanaged switches forwarding unrelated data traffic.
The Ethernet ring solution supports the connection of up to 30 615 series relays.
If more than 30 relays are to be connected, it is recommended to split the network into several rings.
The self-healing Ethernet ring solution avoids single point of failure concerns and improves the reliability of the communication.
For optimized control and reliable operation of your switchyard, the REC670 is your best choice for transmission applications.
REC670 IEDs (Intelligent Electronic Device) provide control solutions for any type of switchgear and different switchgear configurations.
The customized REC670 gives you the freedom to select the functionality entirely according to your needs.
The protection functions also support different types of networks, such as, isolated neutral networks,
resonant-earthed networks and partially earthed networks.
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