BS EN IEC 62439-3:2018

What is BS EN IEC 62439‑3 - Parallel redundancy protocol (PRP) and high-availability seamless redundancy (HSR) about?  

BS EN IEC 62439‑3 belongs to the IEC 62439 series “Industrial communication networks – High availability automation networks”. BS EN IEC 62439‑3 specifies the PRP and HSR seamless redundancy protocols.  

BS EN IEC 62439‑3 was adopted by IEC TC57 WG10 as the redundancy method for demanding substation automation networks operating on layer 2 networks, according to IEC 61850-8-1 and IEC 61850-9-2. The IEC 62439 series is applicable to high-availability automation networks based on Ethernet technology. 

BS EN IEC 62439‑3 specifies two redundancy protocols designed to provide seamless recovery in case of a single failure of an inter-bridge link or bridge in the network, which is based on the same scheme: parallel transmission of duplicated information. 

Who is BS EN IEC 62439‑3 - Parallel redundancy protocol (PRP) and high-availability seamless redundancy (HSR) for? 

BS EN IEC 62439‑3 on parallel redundancy protocol (PRP) and high-availability seamless redundancy (HSR) is useful for: 

• Any organization with an independent communication network 
• IT expert teams 

Why should you use BS EN IEC 62439‑3 - Parallel redundancy protocol (PRP) and high-availability seamless redundancy (HSR)?  

Industrial communication networks are used in control systems to transfer data between field devices and programmable logic controllers (PLCs), between PLCs or between PLCs and personal computers. These networks need to be operational at all times as a failure in the network might result in loss of vital data. 

BS EN IEC 62439‑3 provides you guidance on PRP and HSR protocols. These protocols ensure ethernet redundancy i.e., these networks maintain data transfers even if a single data point fails. BS EN IEC 62439‑3 also provides you with the protocol information conformance statement (PICS) which verifies features that the protocols support. BS EN IEC 62439‑3 helps you gain a better understanding of PRP and HSR, this can help you in incorporating them in your communication networks. 

Overall, the guidelines of BS EN IEC 62439‑3 enable you to achieve a seamless ethernet connection at your organization. 

What’s changed since the last update? 

BS EN IEC 62439‑3:2018 replaces IEC 62439‑3:2012. BS EN IEC 62439‑3:2018 includes the following significant technical changes with respect to IEC 62439‑3:2013: 

• Subclause 4.1.10.3 has been rewritten to explain the calculation of the duplicate rejection for different speeds 
• Annex A has been redrafted as a general concept for doubly attached clocks applicable to end-to-end (E2E) and to peer-to-peer (P2P) link delay measurement; the principle of paired port operation has now been specified in terms of a state machine based on IEC 61588:2009 
• Annex B of IEC 62439-3:2012 has been deleted; its properties are mentioned in 5.3.7 
• Annex B (new) makes the support of redundancy mandatory for IEC/IEEE 618509- 3 that specifies doubly attached clocks on layer 2, with peer-to-peer delay measurement 
• Annex C specifies two profiles of a precision clock for industrial automation: L3E2E for layer 3, end-to-end delay measurement and L2P2P for layer 2, peer-to-peer delay measurement