IEC 61850-9-2:2011/AMD1:2020

IEC 61850-9-2 ®
Edition 2.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Communication networks and systems for power utility automation –
Part 9-2: Specific communication service mapping (SCSM) – Sampled values
over ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes
électriques –
Partie 9-2: Mise en correspondance des services de communication spécifiques
(SCSM) – Valeurs échantillonnées sur ISO/IEC 8802-3
IEC 61850-9-2:2011-09/AMD1:2020-02(en-fr)

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IEC 61850-9-2 ®
Edition 2.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Communication networks and systems for power utility automation –

Part 9-2: Specific communication service mapping (SCSM) – Sampled values

over ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes

électriques –
Partie 9-2: Mise en correspondance des services de communication spécifiques

(SCSM) – Valeurs échantillonnées sur ISO/IEC 8802-3

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200 ISBN 978-2-8322--7380-7

– 2 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by IEC technical committee 57: Power systems
management and associated information exchange.
The text of this amendment is based on the following documents:
FDIS Report on voting
57/2112/FDIS 57/2135/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 website 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• withdrawn,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.
_____________
2 Normative references
Remove the following existing references:
IEC/TR 61850-1
IEC 61850-7-1
IEC 61850-7-4
IEC 60874-10-1
IEC 60874-10-2
IEC 60874-10-2
ISO/IEC 7498-1
Add the following new references:
IEC 61588:2009, Precision clock synchronization protocol for networked measurement and
control systems
© IEC 2020
IEC/IEEE 61850-9-3, Communication networks and systems for power utility automation -
Part 9-3: Precision Time Protocol Profile for Power Utility Automation
IEC TR 61850-90-4, Communication networks and systems for power utility automation - Part
90-4: Network engineering guidelines
ISO 4217:2015, Code for the representation of currencies
RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, IETF, available at
http://www.ietf.org
Update the following existing references:
IEC TS 61850-2, Communication networks and systems for power utility automation - Part 2:
Glossary
IEC TS 62351-6 , Power systems management and associated information exchange - Data
and communications security - Part 6: Security for IEC 61850
IEC 62439-3:2016, Industrial communication networks - High availability automation networks
- Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy
(HSR)
ISO/IEC/IEEE 8802-3, Standard for Ethernet
4 Abbreviations
Remove the following abbreviations:
CSMA/CD
ECT
EVT
GSSE
MAU
Add the following new abbreviation:
PTP
Precision Time Protocol, referring to IEC 61588:2009

____________
Under preparation. Stage at the time of publication: IEC TS/PRVC 62351-6:2020.

– 4 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
5 Communication stack
5.2 Client/server services and communication profiles
Replace the existing text of Subclause 5.2 by the following new text:
Content removed; see IEC 61850-8-1.
5.3 SV service and communication profile
5.3.1 SV mapping overview
Table 4 – Service requiring SV communication profile
Replace existing Table 4 with the following new Table 4:
Model IEC 61850-7-2 service
Multicast sampled value class model Multicast SV message
Unicast sampled value class model Unicast SV message (deprecated)

5.3.2 A-Profile
Table 5 – Service and protocols for SV communication A-Profile
Replace existing Table 5 with the following new Table 5:
OSI model Specification m/o
layer
Name Service specification Protocol specification
Application SendMSVMessage service See clause 8.5 m
Security IEC 62351-6 o
Presentation Abstract syntax ISO/IEC 8824-1:2008 ISO/IEC 8825-1 m
Session
Remove the third paragraph of Subclause 5.3.2.
5.3.3 T-Profile
Add a new heading 5.3.3.1 General before the first paragraph and renumber subsequent
subclauses accordingly.
Table 6 – SV T-Profile
Replace existing Table 6 with the following new Table 6:

© IEC 2020
Specification
OSI model
m/o
Name Service specification Protocol
layer
specification
Transport
Network
Link Parallel redundancy protocol and IEC 62439-3:2016 o
Redundancy high availability seamless ring
DataLink Priority tagging/VLAN IEEE 802.1Q m
Standard for Ethernet ISO/IEC/IEEE 8802-3 m
Physical Interface IEC TR 61850-90-4 c
c If the product standard profiling this standard is not specifying another physical interface, IEC/TR 61850-90-4
applies
Add the following new note after Table 6:
NOTE This document only considers layer 2 sampled values transmission. Routable sampled values mechanisms
are defined in IEC 61850-8-1.
5.3.3.2 Physical layer: Specifications for the medium attachment unit (MAU)
Remove existing Subclause 5.3.3.2 (formerly 5.3.3.1).
5.3.3.2 Link layer: Ethernet addresses
Replace the reference to ISO/IEC 8802-3 multicast/unicast address with ISO/IEC/IEEE 8802-3
multicast.
5.3.3.3 Link layer: Priority tagging/virtual LAN
Replace the existing text of Subclause 5.3.3.3 with the following new text:
IEEE 802.1Q field shall be present in the egress frames from a SV publisher.
Priority tagging according to IEEE 802.1Q is used to separate time-critical and high-priority
bus traffic for protection-relevant applications from low priority bus loads.
Subscribers conformant to this document shall be prepared that the Virtual LAN tag might
have been removed or modified by the network on the path from the publisher to the subscriber.
See Figure 2 for the structure of the tag header.
Octets 8 7 6 5 4 3 2 1
TPID
0 × 8100 (as per 802.1Q)
2 User priority CFI VID
TCI
3 VID
Figure 2 – Structure of the tag header

– 6 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
TPID (tag protocol identifier) field: indicates the Ethernet type assigned for 802.1Q Ethernet
encoded frames. This value shall be 0x8100.
TCI (tag control information) fields: user priority: BS3; user priority value shall be set by
configuration to separate sampled values from low priority bus load. If the priority is not
configured, then the default values of Table 4 shall be used.
CFI (canonical format indicator): BS1 [0]; a single bit flag value. For this standard, the CFI bit
value shall be reset (value = 0).
NOTE If set (value = 1), an embedded resource identification field (E-RIF) follows the Length/Type field in the
ISO/IEC/IEEE 8802-3 tagged frame.
VID: for backward compatibility reasons, the value of the VLAN Identifier shall be zero (0) if
the SMV P-Type VLAN-ID is missing in the configuration.
As IEEE 802.1Q allows implementation with a restricted set of priorities, the higher priority
frames should have a priority of 4 to 7 and the lower priority should have a priority of 1 to 3.
The value 1 is the priority of untagged frames; thus 0 should be avoided as it may cause
unpredictable delay due to normal traffic.
Additionally, since sampled values potentially need to have their own bandwidth allocation,
their configured VID will be different from GOOSE.
The default values for priority and VID shall be as defined in Table 7.
Table 7 – Default Virtual LAN IDs and priorities
Service Default VID Default priority
Sampled Values 0 4
The general ISO/IEC 8802-3 frame structure for sampled values can be found in Annex A.
All implementations that send Sampled Values and claim conformance to this clause of this
standard, shall be capable of configuration of the VID and priority attributes.
All implementations that receive Sampled Values shall be capable of receiving any VID and
priority (e.g. these attributes shall not be used for Source address matching). Additionally,
such implementations shall be capable of processing incoming messages that do not contain
IEEE 802.1Q information.
5.3.3.4 Link layer: Ethertype and other header information
5.3.3.4.1 Ethertype
Replace the reference to ISO/IEC 8802-3 with ISO/IEC/IEEE 8802-3.
5.3.3.4.2 APPID
Replace the reference to ISO/IEC 8802-3 with ISO/IEC/IEEE 8802-3.

© IEC 2020
5.3.3.4.5 Reserved 2
Replace the reference to IEC/TS 62351-6 with IEC 62351-6.
Add the following new text at the end of Subclause 5.3.3.4.5:
Subscribers that do not support IEC 62351-6 shall ignore the value of the fields when it is not
0.
8 Mapping of the model for the transmission of sampled value
...