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Parallel Redundancy Protocol (PRP) is a network protocol standard for Ethernet that provides seamless failover against failure of any network component. This redundancy is invisible to the application. PRP nodes have two ports and are attached to two separated networks of similar topology. PRP can be implemented entirely in software, i.e. integrated in the network driver. Nodes with single attachment can be attached to one network only. This is in contrast to the companion standard HSR (IEC 62439-3 Clause 5), with which PRP shares the operating principle.

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  • Das Parallel Redundancy Protocol (PRP) beschreibt ein redundantes Datenkommunikationsnetzwerk. Es ist seit 2010 im Standard IEC 62439-3 „Industrial communication networks: high availability automation networks“ standardisiert. Es handelt sich um ein Layer-2-Redundanzverfahren, welches von höheren Schichten unabhängig ist und sich für die in IEC 61784 beschriebenen Echtzeit-Ethernet-Mechanismen eignen soll. PRP wurde für Automatisierungsnetzwerke entwickelt, die für eine kontinuierliche Betriebsfunktionalität eine hohe Verfügbarkeit erfordern. Während rekonfigurationsbasierte Redundanzprotokolle wie RSTP oder MRP bei Fehlern im Netzwerk immer eine gewisse Umschaltzeit für eine Neukonfigurierung benötigen, bietet das PRP-Protokoll im Fehlerfall eines der beiden redundanten Netzwerke einen stoßfreien kontinuierlichen Betrieb, bei dem kein Datenpaket bei der Übertragung verloren geht oder verzögert wird. (de)
  • Parallel Redundancy Protocol (PRP) is a network protocol standard for Ethernet that provides seamless failover against failure of any network component. This redundancy is invisible to the application. PRP nodes have two ports and are attached to two separated networks of similar topology. PRP can be implemented entirely in software, i.e. integrated in the network driver. Nodes with single attachment can be attached to one network only. This is in contrast to the companion standard HSR (IEC 62439-3 Clause 5), with which PRP shares the operating principle. PRP and HSR are independent of the application-protocol and can be used by most Industrial Ethernet protocols in the IEC 61784 suite. PRP and HSR are standardized by the IEC 62439-3:2016). They have been adopted for substation automation in the framework of IEC 61850. PRP and HSR are suited for applications that request high availability and short switchover time, such as: protection for electrical substation, synchronized drives, for instance in printing machines or high power inverters. For such applications, the recovery time of commonly used protocols such as the Rapid Spanning Tree Protocol (RSTP) is too long. The cost of PRP is a duplication of all network elements that require it. Cost impact is low since it makes little difference if the spares lie on the shelf or are actually working in the plant. The maintenance interval is shortened since more components can fail in use, but such outage will remain invisible to the application. PRP does not cover end node failures, but redundant nodes may be connected via a PRP network. (en)
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  • Das Parallel Redundancy Protocol (PRP) beschreibt ein redundantes Datenkommunikationsnetzwerk. Es ist seit 2010 im Standard IEC 62439-3 „Industrial communication networks: high availability automation networks“ standardisiert. Es handelt sich um ein Layer-2-Redundanzverfahren, welches von höheren Schichten unabhängig ist und sich für die in IEC 61784 beschriebenen Echtzeit-Ethernet-Mechanismen eignen soll. PRP wurde für Automatisierungsnetzwerke entwickelt, die für eine kontinuierliche Betriebsfunktionalität eine hohe Verfügbarkeit erfordern. (de)
  • Parallel Redundancy Protocol (PRP) is a network protocol standard for Ethernet that provides seamless failover against failure of any network component. This redundancy is invisible to the application. PRP nodes have two ports and are attached to two separated networks of similar topology. PRP can be implemented entirely in software, i.e. integrated in the network driver. Nodes with single attachment can be attached to one network only. This is in contrast to the companion standard HSR (IEC 62439-3 Clause 5), with which PRP shares the operating principle. (en)
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  • Parallel Redundancy Protocol (de)
  • Parallel Redundancy Protocol (en)
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