IEC 62439-4:2010/AMD1:2012

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)
IEC 62439-4:2010/A1:2012
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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

– 2 – 62439-4 Amend.1 © IEC:2012
FOREWORD
This amendment has been prepared by subcommittee 65C: Industrial networks, of IEC
technical committee 65: Industrial-process measurement, control and automation.
The text of this amendment is based on the following documents:
FDIS Report on voting
65C/672/FDIS 65C/683/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
8.4.1.1 Protocol_Version
Replace the first paragraph by the following paragraph:
This configured attribute specifies the CRP protocol used. It is an Unsigned8 with a value of
0x01 for the version without the optional extension field and 0x02 for the version with the
optional extension field.
8.5 CRP encoding of the DiagnosticFrame
Table 7
Replace the existing Table 7 by the following new table (modifications are underlined):

62439-4 Amend.1 © IEC:2012 – 3 –
Table 7 – CRP DiagnosticFrame format
Parameter name Offset Data type Size Description
Ethernet DLL header
Preamble 0 8 Alternating ones and zeros
Destination address 8 6 Broadcast, multicast MAC address
Source address 14 6 Unicast source MAC address of adapter used
to send this message.
Type 20 2 0x800 for IP datagrams
IP header
IP version 22 4 IP version (4 bit field) = 4
IP header length  Internet header length (4 bit field) is the
length of the internet header in 32 bit words
= 6
IP type of service  Type of service (8 bit field) – set all fields = 0
Bits 0-2: precedence.
Bit 3: 0 = normal delay, 1 = low delay.
Bits 4: 0 = normal throughput, 1 = high
throughput.
Bits 5: 0 = normal reliability, 1 = high
reliability.
Bit 6-7: reserved for future use.
IP total length  Length of IP field (16 bit field) in bytes,
including IP header and data = 346
IP identifier 26 4 Identifier for fragmented packets. Set = 0
IP flags  Flags (3 bit field)
Bit 0: reserved, shall be zero
Bit 1: don't fragment = 1
Bit 2: 0 = last fragment
IP fragment offset  Position in original datagram. First fragment
= 0
IP time to live 30 Unsigned8 4 Set to 1
IP protocol Unsigned8 User datagram = 1
...