SIST EN 62439-4:2010/A1:2012

Industrial communication networks - High availability automation networks - Part 4: Cross-network Redundancy Protocol (CRP) (IEC 62439-4:2010/A1:2012)

The IEC 62439 series is applicable to high-availability automation networks based on the ISO/IEC 8802-3 (IEEE 802.3) (Ethernet) technology. This part of the IEC 62439 series specifies a redundancy protocol that is based on the duplication of the network, the redundancy protocol being executed within the end nodes, as opposed to a redundancy protocol built in the switches. The switchover decision is taken in each node individually. The cross-network connection capability enables single attached end nodes to be connected on either of the two networks.

Industrielle Kommunikationsnetze - Hochverfügbare Automatisierungsnetze - Teil 4: Redundanz-Protokoll für vermaschte Netze (CRP) (IEC 62439-4:2010/A1:2012)

Réseaux de communication industrielle - Réseaux d’automatisme à haute disponibilité - Partie 4 : Protocole de redondance transréseau (CRP) (CEI 62439-4:2010/A1:2012)

Industrijska komunikacijska omrežja za avtomatizacijo z visoko razpoložljivostjo - 4. del: Protokol redundance prepletenega omrežja (CRP) (IEC 62439-4:2010/A1:2012)

Serija IEC 62439 velja za omrežja za avtomatizacijo z visoko razpoložljivostjo, osnovana na ISO/IEC 8802-3 (IEEE 802.3) (eternet) tehnologiji. Ta del serije IEC 62439 določa redundančni protokol, osnovan na podvajanju omrežja, kjer se redundančni protokol izvaja znotraj končnih vozlišč, v nasprotju z redundančnimi protokoli vgrajenimi v stikala. Odločitev za preklop se izvede na vsakem vozlišču posebej. Medmrežna sposobnost povezave omogoča enojnim priključenim končnim vozliščem, da so lahko povezana na obeh omrežjih.

General Information

• Status: Published
• Publication Date: 06-May-2012
• ICS: 25.040.01 - Industrial automation systems in general
• ICS: 35.110 - Networking
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Apr-2012
• Due Date: 22-Jun-2012
• Completion Date: 07-May-2012
• Ref Project: EN 62439-4:2010/A1:2012 - Industrial communication networks - High availability automation networks - Part 4: Cross-network Redundancy Protocol (CRP)

Relations

• Amends: SIST EN 62439-4:2010 - Industrial communication networks - High availability automation networks - Part 4: Cross-network Redundancy Protocol (CRP) (IEC 62439-4:2010)
• Effective Date: 29-Jan-2023

Overview

EN 62439-4:2010/A1:2012 (Cross‑network Redundancy Protocol, CRP) is a CENELEC‑adopted amendment to IEC 62439‑4 that specifies a protocol for achieving high availability across interconnected industrial networks. The amendment (A1, approved March 2012) updates the CRP encoding and message fields used to exchange redundancy and diagnostic information between networked automation devices, enabling cross‑network redundancy, transparent failover and richer diagnostics in industrial Ethernet environments.

Key topics and technical requirements

• CRP Protocol_Version: a configured Unsigned8 field. Values defined in the amendment include 0x01 (without optional extension) and 0x02 (with optional extension).
• DiagnosticFrame encoding: a precise packet layout is defined including Ethernet, IPv4 and UDP headers followed by a CRP header and body. Notable header values in the amendment:
  • IP header length = 6 (32‑bit words), total IP length reported = 346 bytes.
  • IP TTL set to 1; IP protocol = UDP (decimal 17).
  • UDP contains source/destination ports, length and checksum per IPv4 pseudo‑header rules.
• CRP header fields:
  • Option byte with bit definitions (e.g., Bit6 = 1 indicates optional extension present).
  • reserved (Unsigned16) set to 0x1001.
  • CRP auxiliary address set to 0 (not used).
  • CRP message length: number of octets from end of UDP header to message end.
• CRP body elements:
  • Node identification (Node_Index, Node_Name), Number_of_ports, Transmission adapter (0 = adapter A, 1 = adapter B).
  • Arrays for path and adapter statuses (Path_Status_A_to_A, Path_Status_B_to_A, etc.) whose size depends on the number of adapter statuses.
  • Sequence_Number (Unsigned32) and Duplicate_Detection_State for message ordering and duplicate handling.
  • Optional extension octet string and an Ethernet FCS trailer (4‑byte CRC).
• Diagnostics and redundancy management: the frame structure supports per‑path status reporting and duplicate detection to enable robust cross‑network failover and monitoring.

Applications and who uses it

• Industrial automation and process control networks requiring cross‑network high availability.
• System integrators and network architects designing redundant industrial Ethernet topologies that span different network domains.
• Device vendors and embedded Ethernet adapter manufacturers implementing CRP to ensure interoperability.
• Operations and maintenance teams leveraging DiagnosticFrames for monitoring, troubleshooting and validating redundancy behavior.

Related standards

• Part of the IEC/EN 62439 family for high availability automation networks (see IEC 62439‑4 for CRP specifics). For full deployment, CRP is typically used alongside other industrial Ethernet and network‑redundancy standards in the 62439 series.

Keywords: EN 62439-4, IEC 62439-4, Cross-network Redundancy Protocol, CRP, industrial communication networks, high availability, DiagnosticFrame, network redundancy, industrial Ethernet.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2012
Industrijska komunikacijska omrežja za avtomatizacijo z visoko razpoložljivostjo -
4. del: Protokol redundance prepletenega omrežja (CRP) (IEC 62439-
4:2010/A1:2012)
Industrial communication networks - High availability automation networks - Part 4: Cross
-network Redundancy Protocol (CRP) (IEC 62439-4:2010/A1:2012)
Industrielle Kommunikationsnetze - Hochverfügbare Automatisierungsnetze - Teil 4:
Redundanz-Protokoll für vermaschte Netze (CRP) (IEC 62439-4:2010/A1:2012)
Réseaux de communication industrielle - Réseaux d’automatisme à haute disponibilité -
Partie 4 : Protocole de redondance transréseau (CRP) (CEI 62439-4:2010/A1:2012)
Ta slovenski standard je istoveten z: EN 62439-4:2010/A1:2012
ICS:
25.040.01 Sistemi za avtomatizacijo v Industrial automation
industriji na splošno systems in general
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62439-4/A1
NORME EUROPÉENNE
April 2012
EUROPÄISCHE NORM
ICS 25.040; 35.040
English version
Industrial communication networks -
High availability automation networks -
Part 4: Cross-network Redundancy Protocol (CRP)
(IEC 62439-4:2010/A1:2012)
Réseaux de communication industrielle - Industrielle Kommunikationsnetze -
Réseaux d’automatisme à haute Hochverfügbare Automatisierungsnetze -
disponibilité - Teil 4: Redundanz-Protokoll für
Partie 4 : Protocole de redondance vermaschte Netze (CRP)
transréseau (CRP) (IEC 62439-4:2010/A1:2012)
(CEI 62439-4:2010/A1:2012)
This amendment A1 modifies the European Standard EN 62439-4:2010; it was approved by CENELEC on 2012-
03-30. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
the conditions for giving this amendment the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62439-4:2010/A1:2012 E

Foreword
The text of document 65C/672/FDIS, future edition 1 of IEC 62439-4:2010/A1, prepared by SC 65C,
"Industrial networks", of IEC TC 65, "Industrial-process measurement, control and automation" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62439-4:2010/A1:2012.
The following dates are fixed:
• latest date by which the document has (dop) 2012-12-30
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-03-30
• latest date by which the national
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 62439-4:2010/A1:2012 was approved by CENELEC as a
European Standard without any modification.

IEC 62439-4 ®
Edition 1.0 2012-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Industrial communication networks – High availability automation networks –

Part 4: Cross-network Redundancy Protocol (CRP)

Réseaux de Communication Industriels – Réseaux de haute disponibilité pour

l'automation - Partie 4: Protocole de Redondance a réseau Croisé (CRP)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX D
ICS 25.040; 35.040 ISBN 978-2-88912-929-4
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