EN IEC 61851-24:2024

SLOVENSKI STANDARD
01-februar-2025
Nadomešča:
SIST EN 61851-24:2014
SIST EN 61851-24:2014/AC:2015
Sistem kabelskega napajanja električnih vozil - 24. del: Digitalna komunikacija
med enosmerno (DC) EV-napajalno postajo in električnim vozilom za krmiljenje
enosmernega (DC) napajanja (IEC 61851-24:2023)
Electric vehicle conductive charging system - Part 24: Digital communication between a
DC EV charging station and an electric vehicle for control of DC charging (IEC 61851-
24:2023)
Konduktive Ladesysteme für Elektrofahrzeuge - Teil 24: Digitale Kommunikation
zwischen einer Gleichstromladestation für Elektrofahrzeuge und dem Elektrofahrzeug
zur Steuerung des Gleichstromladevorgangs (IEC 61851-24:2023)
Système de charge conductive pour véhicules électriques - Partie 24: Communication
digitale entre la borne de charge à courant continu et le véhicule électrique pour le
contrôle de la charge à courant continu (IEC 61851-24:2023)
Ta slovenski standard je istoveten z: EN IEC 61851-24:2024
ICS:
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61851-24

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2024
ICS 43.120 Supersedes EN 61851-24:2014; EN 61851-
24:2014/AC:2015
English Version
Electric vehicle conductive charging system - Part 24: Digital
communication between a DC EV supply equipment and an
electric vehicle for control of DC charging
(IEC 61851-24:2023)
Système de charge conductive pour véhicules électriques - Konduktive Ladesysteme für Elektrofahrzeuge - Teil 24:
Partie 24: Communication numérique entre le système Digitale Kommunikation zwischen einer
d'alimentation à courant continu et le véhicule électrique Gleichstromversorgungseinrichtung für Elektrofahrzeuge
pour le contrôle de la charge à courant continu und dem Elektrofahrzeug zur Steuerung des
(IEC 61851-24:2023) Gleichstromladevorgangs
(IEC 61851-24:2023)
This European Standard was approved by CENELEC on 2024-10-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard 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 European Standard 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61851-24:2024 E

European foreword
The text of document 69/909/FDIS, future edition 2 of IEC 61851-24, prepared by TC 69 "Electrical
power/energy transfer systems for electrically propelled road vehicles and industrial trucks" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61851-24:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-12-31
document have to be withdrawn
This document supersedes EN 61851-24:2014 and all of its amendments and corrigenda (if any).
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 standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61851-24:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61851-1:2017 NOTE Approved as EN IEC 61851-1:2019 (not modified)
ISO 8751 NOTE Approved as EN ISO 8751
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 61851-23 2023 Electric vehicle conductive charging system - - -
Part 23: DC electric vehicle supply equipment
ISO/TR 8713 - Electrically propelled road vehicles - Vocabulary - -
ISO 11898-1 2015 Road vehicles - Controller area network (CAN) - - -
Part 1: Data link layer and physical signalling
ISO 11898-2 2016 Road vehicles - Controller area network (CAN) - - -
Part 2: High-speed medium access unit
ISO 15118-2 2014 Road vehicles - Vehicle-to-Grid Communication EN ISO 15118-2 2016
Interface - Part 2: Network and application
protocol requirements
IEC 61851-24 ®
Edition 2.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric vehicle conductive charging system –

Part 24: Digital communication between a DC EV supply equipment and an

electric vehicle for control of DC charging

Système de charge conductive pour véhicules électriques –

Partie 24: Communication numérique entre le système d’alimentation à courant

continu et le véhicule électrique pour le contrôle de la charge à courant continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 43.120  ISBN 978-2-8322-7617-4

– 2 – IEC 61851-24:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 System configuration . 7
5 Digital communication architecture . 7
6 Charging control process . 7
7 Overview of charging control . 7
8 Exchanged information for DC charging control . 8
Annex A (normative) Digital communication for control of DC EV charging system A . 10
A.1 General . 10
A.2 Digital communication actions during charging control process . 10
A.3 Digital communication of DC charging control . 14
A.4 Parameter definition . 15
A.5 Physical/data link layer . 25
A.5.1 Communication circuit . 25
A.5.2 Terminating resistor . 25
A.5.3 Noise filter . 25
A.5.4 CAN transceiver . 25
A.5.5 Twisted-pair line . 25
A.5.6 Overvoltage protection for the CAN communication circuit . 25
A.5.7 Communication protocol . 25
A.5.8 CAN bus . 26
A.5.9 Transmission process . 26
A.5.10 CAN reception error . 27
A.6 Bi-directional power flow . 27
A.6.1 Digital communication actions during charging/discharging control
process. 27
A.6.2 Digital communication of DC charging/discharging control . 31
A.6.3 Parameter definition . 32
A.6.4 Charging/discharging control process . 41
A.6.5 Exchanged information for DC charging/discharging control . 41
Annex B (normative) Digital communication for control of DC charging system B . 43
B.1 General . 43
B.2 Digital communication of DC charging control . 43
B.3 Digital communication actions during charging control process . 43
B.4 Parameter definition . 44
B.5 Physical/data link layer . 48
Annex C (normative) Digital communication for control of DC charging system C . 50
C.1 General . 50
C.2 Required exchange parameters . 50
Bibliography . 52

Figure 1 – Digital communication between a DC EV supply equipment and an electric
vehicle for control of DC charging . 8
Figure A.1 – Sequence diagram of DC charging control communication for system A . 14

IEC 61851-24:2023 © IEC 2023 – 3 –
Figure A.2 – CAN communication circuit . 25
Figure A.3 – CAN bus . 26
Figure A.4 – Transmission cycle . 27
Figure A.5 – Sequence diagram of DC charging/discharging control communication for
system A . 31
Figure B.1 – Sequence diagram of DC charging control communication for system B . 43

Table 1 – Exchanged information for DC charging control . 8
Table A.1 – Communication actions and parameters during DC charging control
process between system A station and vehicle . 11
Table A.2 – Exchanged parameter during DC charging control process from vehicle to
system A station . 16
Table A.3 – Exchanged parameter during DC charging control process from system A
station to vehicle . 20
Table A.4 – The physical link layer specification for system A . 26
Table A.5 – Specification of data transmission . 26
Table A.6 – Communication actions and parameters during DC charging/discharging
control process between system A and vehicle . 28
Table A.7 – Exchanged parameter during DC charging/discharging control process
from vehicle to system A station . 33
Table A.8 – Exchanged parameter during DC charging/discharging control process
from system A station to vehicle . 38
Table A.9 – Exchanged information for DC charging/discharging control . 41
Table B.1 – Communication actions and parameters during DC charging control
process between system B station and vehicle . 44
Table B.2 – Parameters in handshake stage for system B . 45
Table B.3 – Parameters in charge parameter configuration stage for system B . 46
Table B.4 – Parameters in charging stage for system B . 46
Table B.5 – Parameters in charge ending stage for system B. 48
Table B.6 – Error Parameters for system B . 48
Table B.7 – Physical/data link layer specifications for system B . 49
Table C.1 – Required exchanged parameters for DC charging control for system C . 50

– 4 – IEC 61851-24:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –

Part 24: Digital communication between a DC EV supply equipment
and an electric vehicle for control of DC charging

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61851-24 has been prepared by IEC technical committee 69: Electrical power/energy
transfer systems for electrically propelled road vehicles and industrial trucks. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Annex A and Annex B have been updated in line with IEC 61851-23:2023 and relevant
standards.
IEC 61851-24:2023 © IEC 2023 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
69/909/FDIS 69/914/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61851 series, published under the general title Electric vehicle
conductive charging system, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 6 – IEC 61851-24:2023 © IEC 2023
ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –

Part 24: Digital communication between a DC EV supply equipment
and an electric vehicle for control of DC charging

1 Scope
This part of IEC 61851, together with IEC 61851-23, applies to digital communication between
a DC EV supply equipment and an electric road vehicle (EV) for control of conductive DC power
transfer, with a rated supply voltage up to 1 000 V AC or up to 1 500 V DC and a rated output
voltage up to 1 500 V DC.
This document also applies to digital communication between the DC EV charging/discharging
station and the EV for system A, as specified in Annex A.
The EV charging mode is mode 4, according to IEC 61851-23.
Annex A, Annex B, and Annex C give descriptions of digital communications for control of DC
charging specific to DC EV charging systems A, B and C as defined in IEC 61851-23.
2 Normative references
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.
IEC 61851-23:2023, Electric vehicle conductive charging system – Part 23: DC electric vehicle
supply equipment
ISO TR 8713, Electrically propelled road vehicles – Vocabulary
ISO 11898-1:2015, Road vehicles – Controller area network (CAN) – Part 1: Data link layer and
physical signalling
ISO 11898-2:2016, Road vehicles – Controller area network (CAN) – Part 2: High-speed
medium access unit
ISO 15118-2:2014, Road vehicles – Vehicle-to-grid communication interface – Part 2: Network
and application protocol requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO TR 8713 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp

IEC 61851-24:2023 © IEC 2023 – 7 –
This clause of IEC 61851-23:2023 is applicable except as follows:
Additional terms and definitions:
3.1
parameter
single piece of information relevant to charging control, and that is exchanged between a DC
EV supply equipment and an EV using a form of digital communication
3.2
signal
data element that is communicated between a DC EV supply equipment and an EV using any
means other than digital communication
4 System configuration
The system configuration shall be in accordance with GG.2 of IEC 61851-23:20.
5 Digital communication architecture
In this document, two digital communication architectures are used:
• based on CAN using a dedicated data communication circuit; CAN protocol is given in
ISO 11898-1. Refer to Annex A and Annex B for specific implementation details.
• based on Homeplug® Green PHY™ (see IEEE 1901) over the control pilot line; refer to
Annex C for specific implementation details.
6 Charging control process
GG.3 of IEC 61851-23:2023 provides general information on the charging process and the state
of DC EV supply equipment.
Specific requirements of charging process are given in AA.4 and AA.6.3 for system A, BB.4 and
BB.6 for system B, and CC.3 for system C in IEC 61851-23:2023 respectively.
7 Overview of charging control
The digital communication of DC charging control covered by this document is as shown in
Figure 1, identifying the SECC (supply equipment communication controller) and EVCC (EV
communication controller), as defined in IEC 61851-23. This document does not cover the
control protocol internal to the DC EV supply equipment, nor the vehicle, such as power control
protocol for AC/DC inverter of DC EV supply equipment and battery management control in the
vehicle.
___________
Homeplug® and Green PHY™ are examples of suitable products available commercially. This information is given
for the convenience of users of this document and does not constitute an endorsement by IEC of these products.

– 8 – IEC 61851-24:2023 © IEC 2023

Figure 1 – Digital communication between a DC EV supply equipment
and an electric vehicle for control of DC charging
8 Exchanged information for DC charging control
This clause describes information which shall be exchanged between a DC EV supply
equipment and a vehicle during the charging process according to IEC 61851-23. The
information in Table 1 is common to all systems described in Annex A, Annex B and Annex C.
Each information listed in Table 1 is defined as a parameter in each annex. Each system can
have additional parameters, and these parameters are defined in each annex.
Table 1 – Exchanged information for DC charging control
Relevant
No. Information Description requirement in IEC
61851-23:2023
a-1 Current request for the controlled Exchange of current value requested by 6.3.1.101
current charging (CCC) system EV
a-2 Voltage request for the controlled Exchange of voltage value requested
voltage charging (CVC) system by EV
a-3 Maximum rated voltage of DC EV Exchange of maximum rated voltage 6.3.1.101
supply equipment value of DC EV supply equipment
6.3.1.104
a-4 Maximum rated current of DC EV Exchange of maximum rated current 6.3.1.101
supply equipment value of DC EV supply equipment
6.3.1.104
b-1 Communication protocol Exchange of software version of a 6.3.1.104
charging system
6.3.1.106
b-2 Maximum voltage limit of EV Exchange of maximum voltage limit
value of vehicle.
b-3 EV minimum current limit, only for the Under consideration
controlled voltage charging (CVC)
system
b-4 Implementation of optional control Exchange information about available 6.3.1.104
function optional function, such as high current
6.3.2.102
control and dynamic control.
c Insulation check result Exchange of the result of insulation 6.3.1.105
check before charging
– If insulation check fails, a signal is
sent that charging is not allowed.
d Short circuit test before charging Exchange of information on short circuit 6.3.1.109
test before charging
e Charging stopped by user Exchange of information on charge stop 6.3.1.110
command by the user of DC EV supply
equipment
IEC 61851-24:2023 © IEC 2023 – 9 –
Relevant
No. Information Description requirement in IEC
61851-23:2023
f EV supply equipment real time Exchange of EV supply equipment real 6.3.2.102
available load current (optional) time available load current for demand
management. Required for system
providing that function.
g Loss of digital communication Detection of loss of digital 6.3.1.5
communication
– If a receiver does not get
information expected to receive
within time out period, it is
considered as loss of digital
communication.
h-1 Zero current confirmed Notification of zero current confirmed 6.3.1.113
– Station informs EV that low current G.3.4
condition has been met (to allow the
opening and welding check of EV
contactors by EV)
h-2 Welding detection Exchange of information on the whole
process of welding detection
i-1 Normal shutdown Termination of the charging process not 6.3.1.113.2
caused by a failure
i-2 Error shutdown Termination of the charging process 6.3.1.113.3
caused by a failure
– 10 – IEC 61851-24:2023 © IEC 2023
Annex A
(normative)
Digital communication for control
of DC EV charging system A
A.1 General
This annex shows the specification of digital communication for control of the DC EV supply
equipment of system A (in this annex, referred to as "System A station" or "station") as specified
in Annex AA of IEC 61851-23:2023. More detailed information on System A is defined in
IEEE 2030.1.1.
This annex is also applicable to the DC EV charging/discharging station of system A.
NOTE Technical Specifications of CHAdeMO 2.0.1, Amendment 1 2020, provides additional information on system
A. Available at https://www.chademo.com.
A.2 Digital communication actions during charging control process
The communication actions and parameters according to the charging control process as
defined in Table AA.15 of IEC 61851-23:2023 are shown in Table A.1.

IEC 61851-24:2023 © IEC 2023 – 11 –
Table A.1 – Communication actions and parameters during DC charging
control process between system A station and vehicle
Charging Parameter
a
control State Digital communication action
High level action at system level
From DC EV supply equipment From vehicle
stage
DC-A Vehicle unconnected None N/A N/A
DC-B1 Connector plugged in None N/A N/A
DC-B1 Wake up of DCCCF and VCCF None None (default CAN)
Communication data initialization Preparation for digital (default CAN) (default CAN)
communication
Communication established, Exchange of charging control – Control protocol number – Control protocol number
DC-B1→
parameters exchanged, and parameters
DC-B2
– Available output voltage – Total capacity of battery
compatibility checked
– Available output current – Maximum battery voltage
– Battery incompatibility – Maximum charging time
– Energizing state – Target battery voltage
– Identifier of welding detection – Vehicle charging enabled
– Threshold voltage – Minimum charge current
– Charging stop control – Estimated charging time
– Vehicle status
– Charged rate
DC-B2 Connector latched Notification of state of charging – Energizing state None
→DC-B3 progress
DC-B3 Insulation resistance check for DC None – Charging system error None
power line
DC-B3 Pre-charge (depending on the N/A N/A N/A
system architecture)
Initialization
Charge
Handshaking
preparation
– 12 – IEC 61851-24:2023 © IEC 2023
Charging Parameter
a
control State Digital communication action
High level action at system level
From DC EV supply equipment From vehicle
stage
DC-C or Vehicle side contactors closed Notification of vehicle main contactor None – Vehicle status
DC-D closed status
DC-C or Charging by current demand (for Notification of request value of – Station status – Charging current request
DC-D CCC) charging current (or voltage)
– Output voltage – Charging system error
– Output current – Parking status of the vehicle
– Remaining charging time
– Station error
– Charging system error
– Charging stop control
DC-C or Charging by voltage demand (for N/A N/A N/A
DC-D CVC)
DC-C,(D) Current suppression Request of energy transfer shut-off – Station status – Vehicle charging enabled
→DC-B’1
– Charging stop control
– Output voltage
– Output current
DC-B’1 Zero current confirmed Notification of energy transfer shut- – Station status
off
– Charging system error
Welding detection (by vehicle) None None
DC-B’1→
DC-B’2
DC-B’2 Vehicle side contactors open None None – Vehicle status
DC-B’2 DC power line voltage verification Notification of present voltage – Output voltage None
– Energizing state
DC-B’3 Connector unlatched Notification of connector unlatch None None
status
DC-B’4 End of charge at communication Terminate the digital communication None None
level
DC-A Connector unplugged N/A N/A
Shutdown (case 1) Energy transfer

IEC 61851-24:2023 © IEC 2023 – 13 –
Charging Parameter
a
control State Digital communication action
High level action at system level
From DC EV supply equipment From vehicle
stage
DC-B’1 Zero current confirmed Notification of energy transfer shut- – Station status
off
– Charging system error
DC-B’1→ Welding detection (by vehicle) None None
DC-B’2
DC-B’2 Vehicle side contactors open None None – Vehicle status
DC-B’2 DC power line voltage verification Notification of present voltage Output voltage None
Energizing state
DC-B’3-1 Connector remain latched Notification of connector unlatch None None
status
End of charge at communication
DC-B’4-1 Terminate the digital communication None None
level
DC-B’4-2 Connector unlatched or remain N/A N/A
latched
DC-A or Connector unplugged or remain N/A N/A
DC-B1 plugged in
a
The order of actions does not refer to the procedure of charging control process.

Shutdown (case 2)
– 14 – IEC 61851-24:2023 © IEC 2023
A.3 Digital communication of DC charging control
The parameters for digital communication of DC charging control shall be exchanged according
to the sequence diagram as shown in Figure A.1.

NOTE For symbols, see Table AA.1 of IEC 61851-23:2023.
Figure A.1 – Sequence diagram of DC charging control communication for system A

IEC 61851-24:2023 © IEC 2023 – 15 –
A.4 Parameter definition
The definition of parameters during DC charging control process are shown in Table A.2 and
Table A.3. Table A.2 and Table A.3 include the mandatory parameters and the optional
parameters. The optional parameters are applied to the optional charging functions, such as
dynamic control (see AA.7 of IEC 61851-23:2023) and charging with thermal management
system (see AA.9 of IEC 61851-23:2023). The optional charging functions can be used when
the station and the vehicle confirm the availability, specification and compatibility of functions
by exchanging the optional parameters each other.

– 16 – IEC 61851-24:2023 © IEC 2023
Table A.2 – Exchanged parameter during DC charging control process from vehicle to system A station
CAN ID Period Signed or Item in Status
DLC Byte Bit Parameter Content Unit LSB Initial Min Max
(H') (ms) Unsigned Table1 flag
Minimum charging The minimum current
0 0-7 current value to conduct U A 1 0 0 254 a-1 －
charging.
1-3 0-7 － － － － － － － － － －
4 0-7 Maximum battery The maximum voltage
voltage value at the vehicle
inlet terminals, at
which the station U V 1 0 1 200 b-2 －
5 0-7
stops charging to
100 100 8
protect the vehicle
battery
Constant of charging Fixed value for
rate indication charging rate
indication, which is
6 0-7 U － 1 100 0 255 b-2 －
the maximum charging
rate (100 %) of vehicle
battery
7 0-7 － － － － － － － － － －
0 0-7 － － － － － － － － － －
Maximum charging Maximum charging
1 0-7 time (set by 10 s) time permitted by EV, U s 10 0 0 2 540 b-2 －
set by 10 s
Maximum charging Maximum charging
2 0-7 time (set by 1 min) time permitted by EV, U min 1 0 0 255 b-2 －
set by minute
Estimated charging Estimated remaining
101 100 8
time (set by 1 min) time before the end of

3 0-7 U min 1 0 254 b-2 －
charging calculated by
EV
4 0-7 － － － － － － － － － －
5 Rated capacity of Rated capacity of

0-7 U kWh 0,1 0 6 553,5 b-2 －
battery battery
7 0-7 － － － － － － － － － －
IEC 61851-24:2023 © IEC 2023 – 17 –
CAN ID Period Signed or Item in Status
DLC Byte Bit Parameter Content Unit LSB Initial Min Max
(H') (ms) Unsigned Table1 flag
Control protocol Software version of

0 0-7 number control sequence to U － 1 0 255 b-1 －
which EV corresponds
1 0-7 Target battery voltage Targeted charging

voltage at the vehicle U V 1 0 1 200 b-2 －
2 0-7
inlet terminals
Charging current Current value
3 0-7 request requested by EV U A 1 0 0 200 a-1 －
during charging
Battery overvoltage Status flag indicating 0: normal
whether or not the
1: fault
4 0 vehicle battery voltage － － 1 0 0 1 i-2
exceeds the maximum
limit specified by EV
Battery undervoltage Status flag indicating 0: normal
whether or not the
1: fault
1 vehicle battery voltage － － 1 0 0 1 i-2
is less than the lower
limit specified by EV
102 100 8
Battery current Status flag indicating 0: normal
deviation error whether or not the
1: fault
2 output current － － 1 0 0 1 i-2
deviates from EV
requested current
High battery Status flag indicating 0: normal
temperature whether or not the
1: fault
3 temperature of vehicle － － 1 0 0 1 i-2
battery exceeds the
maximum limit
Battery voltage Status flag indicating 0: normal
deviation error whether or not the
1: fault
vehicle battery voltage
4 deviates from the － － 1 0 0 1 i-2
output voltage
measured by the
station
5-7 － － － － － － － － － －
– 18 – IEC 61851-24:2023 © IEC 2023
CAN ID Period Signed or Item in Status
DLC Byte Bit Parameter Content Unit LSB Initial Min Max
(H') (ms) Unsigned Table1 flag
Vehicle charging Status flag indicating 0: disabled
5 0 enabled charge permission － － 1 0 0 1 i-1
1: enabled
status of EV
Parking status of the Status flag indicating 0: vehicle in
vehicle the parking status of parking position

1 － － 1 0 0 1 i-1
the vehicle
1: vehicle not in
parking position
Charging system error Status flag indicating 0: normal
a malfunction caused
2 － － 1 0 0 1 i-2
1: fault
by EV or the station,
and detected by EV
Vehicle status Status flag indicating 0: EV contactor
102 100 8 the EV contactor closed or during
status welding detection
3 － － 1 1 0 1 h-2
1: EV contactor
open or welding
detection finished
Normal stop request Status flag indicating 0: no request

the request of EV to － －
4 before charging 1 0 0 1 i-1
1: request to stop
stop charging control
－ － － － － － － － － －
5-7
Charging rate Charging rate of
－
6 0-7 U % 1 0 100 a-1
battery
7 0-7 － － － － － － － － － －
Optional parameters
2 Minimum battery The minimum voltage
voltage value at the vehicle
inlet terminals, at
100 100 8 0-7 which the station U V 1 0 1 200 b-2 －
stops discharging to
protect the vehicle
battery.
IEC 61851-24:2023 © IEC 2023 – 19 –
CAN ID Period Signed or Item in Status
DLC Byte Bit Parameter Content Unit LSB Initial Min Max
(H') (ms) Unsigned Table1 flag
Dynamic control Flag indicating vehicle
0: Incompatible
0 that is compatible with － 1 0 0 1
1: Compatible
dynamic control.
High current control Flag indicating vehicle
0: Incompatible
1 that is compatible with － 1 0 0 1
1: Compatible
high current control.
High voltage control Flag indicating vehicle
0: Incompatible
2 that is compatible with － 1 0 0 1
110 100 8
1: compatible
high voltage control.
2-7 － － － － － － － － － －
Request charging Current value that
current (extended) vehicle requests the
1-2 0-7 U A 1 0 0 1 023 a-1 －
station during
charging.
－ － － － － － － － － －
3-7 0-7
EV manufacturer code Number assigned for
0 0-7 each EV manufacturer － 1 0 255 －
using the option code.
Option code Data area exchanged
700 100 8
between EV supply
equipment and EV for
1-7 0-7 － － － － － － － －
specific control or
function defined by
the EV manufacturer
Key
DLC Data length code
U Unsigned
LSB Least significant bit
– 20 – IEC 61851-24:2023 © IEC 2023
Table A.3 – Exchanged parameter during DC charging control process from system A station to vehicle
ID Period DLC Byte Bit Parameter Content Signed Unit LSB Initial Min Max Item in Status flag
(H') (ms) or Table 1
Unsigned
Identifier of welding Identifier indicating 0: not supporting
detection whether or not the vehicle welding
station deals with EV detection

contactor welding
0 0-7 － － 1 0 255 h-2
1 or more:
detection
supporting
vehicle welding
detection
1 0-7 Available output Maximum output
voltage voltage value at the
U V 1 0 1 200 a-3 －
vehicle connector
2 0-7
108 100 8
terminals
Available output Maximum output

3 0-7 current current value of the U A 1 0 255 a-4 －
station
4 0-7 Threshold voltage Threshold voltage to
stop the charging
process in order to U V 1 0 1 200 b-2 －
5 0-7
protect vehicle
battery
6-7 0-7 － － － － － － － － － －
Control protocol Software version
number number of control
0 0-7 protocol or charging U － 1 0 255 b-1 －
sequences that the
station deals with
1 0-7 Output voltage Supply voltage value
109 100 8
of the output circuit in －
U V 1 0 0 1 200 b-1
2 0-7
the station
Output current Supply current value
3 0-7 of the output circuit in U A 1 0 0 255 b-1 －
the station
4 0-7 － － － － － － － － － －
IEC 61851-24:2023 © IEC 2023 – 21 –
ID Period DLC Byte Bit Parameter Content Signed Unit LSB Initial Min Max Item in Status flag
(H') (ms) or Table 1
Unsigned
Station status Status flag indicating 0: standby
c
0 the energy transfer － － 1 0 0 1
1: charging
h-1
from the station
Station malfunction Status flag indicating 0: normal
whether or not there c
－ － 1: fault
1 1 0 0 1
is a malfunction h-1
caused by the station
Status flag indicating
Energizing state 0: disable
a state in which
1: enable
voltage can be
c
2 applied from the － － 1 0 0 1
h-1
station or a state in
which output
charging is permitted
Battery Status flag indicating 0: compatible
incompatibility t
...