SIST EN 61850-9-2:2012/A1:2020

Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3

Kommunikationsnetze und -systeme für die Automatisierung in der elektrischen Energieversorgung - Teil 9-2: Spezifische Abbildung von Kommunikationsdiensten (SCSM) - Abgetastete Werte über 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 l'ISO/CEI 8802-3

Komunikacijska omrežja in sistemi za avtomatizacijo porabe električne energije - 9-2. del: Preslikave posebne komunikacijske storitve (SCSM) - Vzorčne/odčitane vrednosti po ISO/IEC 8802-3 - Dopolnilo A1

General Information

• Status: Published
• Publication Date: 29-Apr-2020
• ICS: 29.240.30 - Control equipment for electric power systems
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: PSE - Power systems management
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 22-Apr-2020
• Due Date: 27-Jun-2020
• Completion Date: 30-Apr-2020
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: EN 61850-9-2:2011/A1:2020 - Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3

Relations

• Amends: SIST EN 61850-9-2:2012 - Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3
• Effective Date: 01-Jun-2020

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61850-9-2:2012/A1:2020
01-junij-2020
Komunikacijska omrežja in sistemi za avtomatizacijo porabe električne energije - 9
-2. del: Preslikave posebne komunikacijske storitve (SCSM) - Vzorčne/odčitane
vrednosti po ISO/IEC 8802-3 - Dopolnilo A1
Communication networks and systems for power utility automation - Part 9-2: Specific
communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3
Kommunikationsnetze und -systeme für die Automatisierung in der elektrischen
Energieversorgung - Teil 9-2: Spezifische Abbildung von Kommunikationsdiensten
(SCSM) - Abgetastete Werte über 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 l'ISO/CEI 8802-3
Ta slovenski standard je istoveten z: EN 61850-9-2:2011/A1:2020
ICS:
29.240.30 Krmilna oprema za Control equipment for electric
elektroenergetske sisteme power systems
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
SIST EN 61850-9-2:2012/A1:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61850-9-2:2012/A1:2020

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SIST EN 61850-9-2:2012/A1:2020


EUROPEAN STANDARD EN 61850-9-2:2011/A1

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2020
ICS 33.200

English Version
Communication networks and systems for power utility
automation - Part 9-2: Specific communication service mapping
(SCSM) - Sampled values over ISO/IEC 8802-3
(IEC 61850-9-2:2011/A1:2020)
Réseaux et systèmes de communication pour Kommunikationsnetze und -systeme für die
l'automatisation des systèmes électriques - Partie 9-2: Mise Automatisierung in der elektrischen Energieversorgung -
en correspondance des services de communication Teil 9-2: Spezifische Abbildung von
spécifiques (SCSM) - Valeurs échantillonnées sur ISO/IEC Kommunikationsdiensten (SCSM) - Abgetastete Werte über
8802-3 ISO/IEC 8802-3
(IEC 61850-9-2:2011/A1:2020) (IEC 61850-9-2:2011/A1:2020)
This amendment A1 modifies the European Standard EN 61850-9-2:2011; it was approved by CENELEC on 2020-03-18. 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61850-9-2:2011/A1:2020 E

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SIST EN 61850-9-2:2012/A1:2020
EN 61850-9-2:2011/A1:2020 (E)
European foreword
The text of document 57/2112/FDIS, future IEC 61850-9-2/A1, prepared by IEC/TC 57 "Power
systems management and associated information exchange" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN 61850-9-2:2011/A1:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-12-18
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-03-18
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 shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 61850-9-2:2011/A1:2020 was approved by CENELEC as a
European Standard without any modification.


2

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SIST EN 61850-9-2:2012/A1:2020
EN 61850-9-2:2011/A1:2020 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Delete the following references:
Publication Year Title EN/HD Year
IEC/TR 61850-1 - Communication networks and systems in - -
substations - Part 1: Introduction and
overview
IEC 61850-7-1 - Communication networks and systems for EN 61850-7-1 -
power utility automation - Part 7-1: Basic
communication structure - Principles and
models
IEC 61850-7-4 - Communication networks and systems for EN 61850-7-4 -
power utility automation - Part 7-4: Basic
communication structure - Compatible logical
node classes and data object classes
IEC 60874-10-1 - Connectors for optical fibres and cables - Part - -
10-1: Detail specification for fibre optic
connector type BFOC/2,5 terminated to
multimode fibre type A1
IEC 60874-10-2 - Connectors for optical fibres and cables - Part - -
10-2: Detail specification for fibre optic
connector type BFOC/2,5 terminated to
single-mode fibre type B1
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic reference model: The
basic model

3

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SIST EN 61850-9-2:2012/A1:2020
EN 61850-9-2:2011/A1:2020 (E)
Add the following references:
Publication Year Title EN/HD Year
IEC 61588 2009 Precision clock synchronization protocol for - -
networked measurement and control systems
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 Codes for the representation of currencies - -
RFC 2460 - Internet Protocol, Version 6 (IPv6) - -
Specification

Update the following references:
Publication Year Title EN/HD Year
IEC/TS 61850-2 - Communication networks and systems in - -
substations - Part 2: Glossary
1
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 - -



1
Under preparation. Stage at the time of publication: IEC TS/PRVC 62351-6:2020.
4

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SIST EN 61850-9-2:2012/A1:2020



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












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 33.200 ISBN 978-2-8322--7380-7



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61850-9-2:2012/A1:2020
– 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

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 3 –
© 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
1
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

____________
1
 Under preparation. Stage at the time of publication: IEC TS/PRVC 62351-6:2020.

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– 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:

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 5 –
© 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
0
TPID
0 × 8100 (as per 802.1Q)
1
2 User priority CFI VID
TCI
3 VID

Figure 2 – Structure of the tag header

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– 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.

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 7 –
© 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 values
8.1 Overview
Remove, in the second paragraph of Subclause 8.1, the text "for unicast and multicast".
8.2 Mapping of the multicast sampled value control block class and services
8.2.1 Multicast sampled value control block definition
Table 9 – MMS TypeDescription definition for MSVCB MMS structure
Replace existing Table 9 with the following new Table 9:
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
MsvCBNam Identifier r m MMS Identifier of the structure of the
MsvCBName within the MMS object named:
LLN0$MS e.g. LLN0$MS$
MsvCBRef Visible-string r m
The value of this component shall contain
the IEC Reference of the MsvCB.
e.g.
/LLN0$MS$
SvEna Boolean r/w m TRUE = transmission of sampled value
buffer is activated.
FALSE = transmission of sampled value
buffer is deactivated.
MsvID Visible-string r m System-wide unique identification.
It is strongly recommended to use a four-
byte hexadecimal representation of APPID
value as system-wide unique identification
DatSet Visible-string r m The value of this component shall contain
the IEC reference of the DataSet conveyed
by the MsvCB. This ObjectReference shall
be limited to VMD or Domain scoped
NamedVariableLists.
Only FCDA of Basic Types are allowed to be
members of the DataSet.
ConfRev Unsigned integer r m Count of configuration changes regard to
MSVCB.
SmpRate Unsigned integer r m Amount of samples (default per nominal
period, see SmpMod).
OptFlds Bitstring  See Table 20
refresh-time Boolean r m TRUE = SV buffer contains the attribute
“RefrTm”.
FALSE = attribute “RefrTm” is not available
in the SV buffer.
sample- Boolean r m Value will be ignored. Kept to ensure
synchronised backward compatibility with IEC 61850-9-
2:2004

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– 8 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
sample-rate Boolean r m TRUE = SV buffer contains the attribute
“SmpRate”.
FALSE = attribute “SmpRate” is not available
in the SV buffer.
data-set-name Boolean r m TRUE = SV buffer contains the attribute
“DatSet”.
FALSE = attribute “DatSet” is not available
in the SV buffer.
security Boolean r m Mapping specific attribute.
TRUE = SV buffer contains the attribute
“Security”.
FALSE = attribute “Security” is not available
in the SV buffer.
sample-mode Boolean r m TRUE = SV buffer contains the attribute
“SmpMod”.
FALSE = attribute “SmpMod” is not available
in the SV buffer.
synch-source- Boolean r m TRUE = SV buffer contains the attribute
identity “GmIdentity”.
FALSE = attribute “GmIdentity” is not
available in the SV buffer.
SmpMod Enumerated r m smpMod specifies
0 = samples per nominal period (DEFAULT)
1 = samples per second
2 = seconds per sample
If not available (backward compatibility) the
default value is 0.
DstAddress PhyComAddr m Mapping specific attribute. See Table 10
noASDU Unsigned integer r m Mapping specific attribute.
Number of ASDU concatenated into one
APDU.

Replace existing Table 10 by the following new Table 10:
Table 10 – PhyComAddr structure
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
Addr OCTET-STRING r m Length is 6 octets and contains the value of
the destination media access control (MAC)
address to which the SV message is to be
sent.
The DstAddress shall be an Ethernet
address that has the multicast bit set to
TRUE. In order to facilitate the network
traffic filtering, it is recommended to use
different Ethernet addresses for each
DstAddress.
See Annex B for multicast addressing
recommendations
PRIORITY Unsigned8 r m Range of values shall be limited from 0 to 7.
VID Unsigned16 r/w m Range of values shall be limited from 0 to
4 095.
APPID Unsigned16 r m As defined in 5.3.3.

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 9 –
© IEC 2020
Add, after Table 10, the following new Table 20:
Table 20 – Mapping of OptFlds within Bitstring
MMS component name Bitstring bit position
refresh-time 0
sample-synchronised 1
sample-rate 2
data-set-name 3
security 4
sample-mode 5
synch-source-identity 6

8.2.2 MSV Services
Table 11 – Mapping of multicast sampled value services
Replace existing Table 11 with the following new Table 11:
Service
Services of MSVCB Class
Transmission of MSV messages is mapped directly on
SendMSVMessage
data link layer as defined in 8.4 and 8.5
Mapped to MMS read service
GetMSVCBValue
Mapped to MMS write service
SetMSVCBValue
GetMsvReference Mapped to Management service
GetMSVElementNumber

8.3 Mapping of the unicast sampled value control block class and services
Replace the existing text of Subclause 8.3 with the following new text:
The usage of unicast sampled values frames has been deprecated.
8.4 Mapping of the update of the sampled value buffer
Replace, in the second paragraph of Subclause 84, the reference to ISO/IEC 8802-3 with
ISO/IEC/IEEE 8802-3.
8.5 Additional definitions for the transmission of sampled values
8.5.2 Presentation layer functionality
Table 14 – Encoding for the transmission of the sampled value buffer
Replace existing Table 14 with the following new Table 14:

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SIST EN 61850-9-2:2012/A1:2020
– 10 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
IEC61850 DEFINITIONS::= BEGIN
IMPORTS Data FROM ISO-IEC-9506-2
IEC 61850-9-2 Specific Protocol::= CHOICE {
  savPdu   [APPLICATION 0] IMPLICIT SavPdu,

Abstract buffer format Coding in IEC 61850-9-2 Comments
according to IEC 61850-7-2
Attribute name Attribute type ASN.1 basic encoding rules (BER)
SavPdu::=
SEQUENCE {
 noASDU [0] IMPLICIT INTEGER Mapping specific attribute.
(1.65535),
Number of ASDUs, which will be
concatenated into one APDU.
 security [1] ANY OPTIONAL, Mapping specific attribute.
Reserved for future definition (e.g.
digital signature).
 asdu [2] IMPLICIT SEQUENCE OF 1 to n number of ASDUs as
ASDU specified before.
…
}
 ASDU::=
SEQUENCE {
MsvID VisString129 svID [0] IMPLICIT VisibleString, Should be a system-wide unique
identification.
It is strongly recommended to use a
four bytes hexadecimal
representation of APPID value as
this system-wide unique
identification
DatSet ObjectReference datset [1] IMPLICIT VisibleString Value from the MSVCB
OPTIONAL,
If MsvID allows to have a unique
identification of the stream over the
subnetwork, it is not recommended
to include this field
SmpCnt INT16U smpCnt [2] IMPLICIT OCTET STRING Will be incremented each time a
(SIZE(2)), new sampled value is taken.
The domain shall define how the
counter shall be used. For instance,
IEC 61869-9 defines it for time
alignment: the counter shall be set
to zero when the synchronization
occurs.
The OCTET STRING is interpreted
as INT16U as defined in Table 15.
Rollover may occur.
ConfRev INT32U confRev [3] IMPLICIT OCTET STRING Value from the MSVCB.
(SIZE(4)),
The OCTET STRING is interpreted
as INT32U as defined in Table 15.
RefrTm Timestamp refrTm [4] IMPLICIT UtcTime Time when the transmission buffer
OPTIONAL, has been refreshed locally. This is
the time of the physical event
corresponding to the SV transmitted
in this ASDU
SmpSynch INT8U smpSynch [5] IMPLICIT OCTET Refer to Synchronization clause for
STRING (SIZE(1)), details

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 11 –
© IEC 2020
Abstract buffer format Coding in IEC 61850-9-2 Comments
according to IEC 61850-7-2
SmpRate INT16U smpRate [6] IMPLICIT OCTET Value from the MSVCB.
STRING (SIZE(2)) OPTIONAL,
The OCTET STRING is interpreted
as INT16U as defined in Table 15.
Sample [1.n] Type depends on sample [7] IMPLICIT OCTET STRING List of data values related to the
the CDC defined in (SIZE(n)), data set definition.
IEC 61850-7-3.
For the encoding of the Data, the
rules for the encoding of the basic
data types shall apply as defined in
8.6.
Only FCDA of Basic Type are
allowed to be members of the data
set.
The SIZE (n) is the cumulated size
of all the data conveyed as defined
in the DataSet.
SmpMod INT16U smpMod [8] IMPLICIT OCTET STRING Value from the MSVCB.
(SIZE(2)) OPTIONAL
The OCTET STRING is interpreted
, as INT16U as defined in Table 15.
SynchSrcID Ident8 gmIdentity [9] IMPLICIT OCTET Refer to Synchronization clause for
STRING (SIZE(8)) OPTIONAL details
…
}
NOTE The usage of the OptFlds attribute according to IEC 61850-7-2 is not necessary, because the relating
attributes RefrTm, security, SmpRate, SmpMod, SynchSrcID and DatSet will be signed as optional via the ASN.1
attribute directly.

... }

END

8.6 Definitions for basic data types – Presentation layer functionality
Replace the existing text of Subclause 8.6 with the following new text:
Table 15 shows the encoding for the basic data types used for the data values referenced by
the data set members.
As an exception of the BITSTRING encoding shown in Table 15, for backward compatibility
with existing implementations of the standard, Table 21 defines a specific mapping for
IEC 61850-7-2 quality.

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SIST EN 61850-9-2:2012/A1:2020
– 12 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
Table 15 – Encoding for the basic data types
Data types according to Encoding in data set Comments
IEC 61850-7-2
BOOLEAN 8-bit set to 0 FALSE; anything else = TRUE
INT8 8-bit big-endian Signed
INT16 16-bit big-endian Signed
INT32 32-bit big-endian Signed
INT64 64-bit big-endian Signed
INT8U 8-bit big-endian Unsigned
INT16U 16-bit big-endian Unsigned
INT32U 32-bit big-endian Unsigned
FLOAT32 32-bit IEEE Floating Point (IEEE 754)
ENUMERATED 32-bit big-endian Signed
CODED ENUM 32-bit big-endian
OCTET STRING 20 -byte ASCII text, null terminated
VISIBLE STRING 35 -byte ASCII text, null terminated
UNICODE STRING 20 -byte, null terminated
ObjectName 20 -byte ASCII text, null terminated
ObjectReference 20 -byte ASCII text, null terminated
Timestamp 64-bit timestamp as defined in IEC 61850-8-1
EntryTime 48-bit timestamp as defined in IEC 61850-8-1
EntryID 8 bytes
Currency 4-byte ASCII text, null terminated (ISO 4217)
Data types according to Encoding in data set Comments
IEC 61850-8-1
BITSTRING
32-bit – Bit 0 shall be the leftmost (most
significant) bit of the first transmitted octet. Bit
7 shall be the rightmost (least significant) bit of
the first transmitted octet. Bit 8 shall be the
leftmost (most significant) bit of the second
octet. Bit 15 shall be the rightmost (least
significant) bit of the second octet. This shall be
continued in that way in further octets.

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SIST EN 61850-9-2:2012/A1:2020
IEC 61850-9-2:2011/AMD1:2020 – 13 –
© IEC 2020
Table 21 – Mapping for IEC 61850-7-2 quality
Bit number IEC 61850-7-2 Bit-String
Attribute name Attribute value Value Default
31-30 Validity Good 0 0 0 0
 Invalid 0 1
1
 Invalid 1 0
 Questionable 1 1
29 Overflow TRUE FALSE
28 OutofRange TRUE FALSE
27 BadReference TRUE FALSE
26 Oscillatory TRUE FALSE
25 Failure TRUE FALSE
24 OldData TRUE FALSE
23 Inconsistent TRUE FALSE
22 Inaccurate TRUE FALSE
21 Source Process 0 0
 Substituted 1
20 Test TRUE FALSE
19 OperatorBlocked TRUE FALSE
1
The reserved value has been redefined to "invalid" for backward compatibility.

A value quality with a validity = Invalid, Failure = TRUE and Test = TRUE corresponds to a
0x0842.
Add the following new Clause 9 and renumber subsequent clauses ac
...