IEC 63584:2024

Open Charge Point Protocol (OCPP)

IEC 63584:2024 The Open Charge Point Protocol (OCPP) provides the communication between a Charging Station and a Charging Station Management System (CSMS) and is designed to accommodate any type of charging technique. It is based on OCPP 2.0.1 and was submitted as a Fast-Track document.

General Information

• Status: Published
• Publication Date: 17-Dec-2024
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 69 - Electrical power/energy transfer systems for electrically propelled road vehicles and industrial trucks
• Current Stage: PPUB - Publication issued
• Start Date: 18-Dec-2024
• Completion Date: 28-Jan-2025

Overview

IEC 63584:2024 - Open Charge Point Protocol (OCPP) defines an international standard for communications between a Charging Station (EVSE) and a Charging Station Management System (CSMS). Published as a fast-track adoption of OCPP 2.0.1, this IEC standard specifies message structures, features and functional blocks designed to accommodate any charging technique and support large, distributed EV charging deployments. The document targets interoperability, operational efficiency and secure integration with smart-grid services.

Key Topics and Technical Requirements

• Protocol versioning: Based on OCPP 2.0.1 (Edition 3) and intended to replace OCPP 2.0; not backward compatible with OCPP 1.6 or 1.5.
• Scope: Defines the communication interface between Charging Stations and a CSMS for session control, status reporting, configuration and monitoring.
• Device Management (Device Model):
  • Inventory reporting and improved configuration
  • Enhanced error/state reporting and customizable monitoring
  • Enables multi-vendor device visibility for Charging Station Operators (CSOs)
• Transaction handling:
  • Unified transaction reporting using TransactionEvent to consolidate StartTransaction, StopTransaction, MeterValue and related messages for more robust handling of large transaction volumes
• Cybersecurity improvements:
  • Enhancements to better protect communications and support secure operations (document emphasizes improved security practices compared with earlier releases)
• Extended Smart Charging & Grid integration:
  • Support for advanced load management and scheduling to enable demand response and energy management scenarios
• Interoperability with ISO 15118:
  • Provisions to support integration with ISO 15118 features (e.g., vehicle-to-grid/pkI-related workflows)
• Transport protocols:
  • Support for OCPP-J and other transport refinements to improve reliability and scalability
• Documentation structure:
  • Organized into functional blocks and use-cases to guide implementers

Applications and Who Uses It

• Charging Station Manufacturers - implement the standard to ensure their hardware interoperates with CSMS platforms and supports device management features.
• CSMS Providers and Software Integrators - build back-end services for session control, billing, analytics, and remote operations.
• Charging Station Operators (CSOs) - manage multi-vendor fleets with unified monitoring, diagnostics and configuration.
• Utilities and EMS Integrators - integrate EV charging into smart-grid load management and demand-response programs.
• System Architects and Standards Bodies - reference the standard for procurement, certification and interoperability testing.

Related Standards

• ISO 15118 - vehicle-to-grid communication and EV charging use-cases (referenced for integration).
• IEC 61851-1 - EV conductive charging system general requirements (normative reference).

Keywords: IEC 63584:2024, Open Charge Point Protocol, OCPP 2.0.1, Charging Station, CSMS, EVSE, smart charging, device management, TransactionEvent, ISO 15118, cybersecurity.

Standards Content (Sample)

IEC 63584 ®
Edition 1.0 2024-12
INTERNATIONAL
STANDARD
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Open Charge Point Protocol (OCPP)

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IEC 63584 ®
Edition 1.0 2024-12
INTERNATIONAL
STANDARD
colour
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Open Charge Point Protocol (OCPP)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 43.120  ISBN 978-2-8327-0109-6

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPEN CHARGE POINT PROTOCOL (OCPP)
FOREWORD
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IEC 63584 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.
The text of this document is based on OCPP 2.0.1 Edition 3 FINAL, 2024-05-06. It was
submitted to the National Committees for voting under the Fast Track Procedure. It is used with
permission of the copyright holder: Open Charge Alliance.
The text of this International Standard is based on the following documents:
Draft Report on voting
69/964/CDV 69/1028/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
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OCPP 2.0.1
Part 0 - Introduction
Edition 3 FINAL, 2024-05-06
Table of Contents
Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
Version History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.1. OCPP version 2.0.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.2. Terms and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.3. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
2. New functionalities in OCPP2.0.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2.1. Device Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2.2. Improvements for better handling of large amounts of transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2.3. Improvements regarding cyber security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2.4. Extended Smart Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
2.5. Support for ISO 15118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
2.6. Improvements for customer experience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
2.7. Transport Protocols: OCPP-J Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
2.8. Minor changes/extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
3. OCPP 2.0.1 Documentation Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
3.1. Overview of Specification Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
3.2. Functional Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
3.3. All Functional Blocks and use cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
4. Basic implementation of OCPP 2.0.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

Disclaimer
The OCA hereby grants to IEC a license to fully exploit the OCPP for commercial and non-commercial purposes and to permit IEC
National Committees to nationally adopt and translate OCPP under the applicable IEC policies. Notwithstanding the foregoing, IEC is
not entitled to share adapted, altered, transformed or otherwise modified versions of the OCPP. Such license includes the right of IEC
to grant sub-licenses to its members for purposes of national adoption, distribution and reproduction in any format including
electronic for purposes of distribution on a commercial or non-commercial basis.
1/13 Part 0 - Introduction
Version History
Version Date Description
2024-05-06 OCPP 2.0.1 Edition 3. All errata from OCPP 2.0.1 Part 0 until and including Errata
2.0.1 Edition 3
2024-04 have been merged into this version of the specification.
2020-03-31 Final version of OCPP 2.0.1
2.0.1
2018-04-11
2.0 OCPP 2.0 April 2018
First release of this Introduction document
2/13 Part 0 - Introduction
1. Introduction
Electric Vehicles (EVs) are becoming the new standard for mobility all over the world. This development is only possible with a
good coverage of Charging Stations. To advance the roll out of charging infrastructure, open communication standards play a key
role: to enable switching from charging network without necessarily replacing all the Charging Stations, to encourage innovation
and cost effectiveness and to allow many and diverse players participate in this new industry.
Additionally, the EV charging infrastructure is part of the Smart Grid, a larger and still evolving ecosystem of actors, devices and
protocols. In this Smart Grid ecosystem, open communications standards are key enablers for two-way power flows, real time
information exchange, demand control and eMobility services.
The Open Charge Point Protocol (OCPP) is the industry-supported de facto standard for communication between a Charging
Station and a Charging Station Management System (CSMS) and is designed to accommodate any type of charging technique.
OCPP is an open standard with no cost or licensing barriers for adoption.
1.1. OCPP version 2.0.1
This specification defines version 2.0.1 of OCPP.
After the release of OCPP 2.0, some issues were found in OCPP 2.0. Some of these issues could not be fixed issuing errata to the
specification text only, as has been done with OCPP 1.6, but required changes to the protocol’s machine-readable schema
definition files that cannot be backward compatible.
To prevent confusion in the market and possible interoperability issues in the field, OCA has decided to name this version: 2.0.1.
OCPP 2.0.1 contains fixes for all the known issues, to date, not only the fixes to the messages.
This version replaces OCPP 2.0. OCA advises implementers of OCPP to no longer implement OCPP 2.0 and only use version 2.0.1
going forward.
Any mentions of "OCPP 2.0" refers to revision 2.0.1 unless specifically stated otherwise.
1.2. Terms and abbreviations
This section contains the terminology and abbreviations that are used throughout this document.
1.2.1. Terms
Term Meaning
Charging Station The Charging Station is the physical system where an EV can be charged. A Charging Station has one or
more EVSEs.
Charging Station Charging Station Management System: manages Charging Stations and has the information for authorizing
Management Users for using its Charging Stations.
System (CSMS)
Electric Vehicle An EVSE is considered as an independently operated and managed part of the Charging Station that can
Supply Equipment deliver energy to one EV at a time.
(EVSE)
Energy Management In this document this is defined as a device that manages the local loads (consumption and production)
System (EMS) based on local and/or contractual constraints and/or contractual incentives. It has additional inputs, such as
sensors and controls from e.g. PV, battery storage.
1.2.2. Abbreviations
Term Meaning
CSO Charging Station Operator
CSMS Charging Station Management System
EMS Energy Management System.
EV Electric Vehicle
EVSE Electric Vehicle Supply Equipment
RFID Radio-Frequency Identification
3/13 Part 0 - Introduction
1.3. References
Table 1. References
Reference Description
[IEC61851-1] IEC 61851-1 2017: EV conductive charging system - Part 1: General requirements. https://webstore.iec.ch/
publication/33644
[IEC62559-2:2015] Definition of the templates for use cases, actor list and requirements list. https://webstore.iec.ch/
publication/22349
[ISO15118-1] ISO 15118-1 specifies terms and definitions, general requirements and use cases as the basis for the other
parts of ISO 15118. It provides a general overview and a common understanding of aspects influencing the
charge process, payment and load leveling. https://webstore.iec.ch/publication/9272
[OCPP1.5] http://www.openchargealliance.org/downloads/
[OCPP1.6] http://www.openchargealliance.org/downloads/
4/13 Part 0 - Introduction
2. New functionalities in OCPP2.0.1
OCPP 2.0.1 introduces new functionalities compared to OCPP 1.6 [OCPP1.6].
Due to improvements and new features, OCPP 2.0.1 is not backward compatible with OCPP 1.6 [OCPP1.6] or OCPP 1.5 [OCPP1.5].
2.1. Device Management
Device Management (also known as Device Model) is a long awaited feature especially welcomed by CSOs who manage a network
of (complex) charging stations (from different vendors).
It provides the following functionality:
• Inventory reporting
• Improved error and state reporting
• Improved configuration
• Customizable Monitoring
This all should help CSOs to reduce the costs of operating a Charging Station network.
Charging Station Manufacturers are free to decide themselves how much details about a Charging Station they want to publish via
Device Management: for example, they can decide what can be monitored, and what not.
2.2. Improvements for better handling of large amounts of transactions
2.2.1. One message for all transaction related functionalities
With the growing of the EV charging market, the number of Charging Stations and transactions that the CSMS needs to manage
also grows. The structure and method for reporting transaction is unified in OCPP 2.0. In OCPP 1.x, the reporting of transaction
data is split over the messages StartTransaction, StopTransaction, MeterValue and StatusNotification. With the market progressing
towards more enhanced scheduling, a need is born for more sophisticated handling of transaction data. All the StartTransaction,
StopTransaction, and transaction related MeterValue and StatusNotification messages are replaced by 'TransactionEvent'. The
StatusNotification message still exists, but only for non-transaction related status notifications about connector availability.
2.2.2. Data reduction
With the introduction of JSON over Websockets in OCPP 1.6 [OCPP1.6] a great reduction of mobile data cost can be achieved. With
OCPP 2.0, support for WebSocket Compression is introduced, which reduces the amount of data even more.
2.3. Improvements regarding cyber security
The following improvements have been added to harden OCPP against cyber attacks:
• Security profiles (3 levels) for Charging Station and/or CSMS authentication and Communication Security
• Key management for Client-Side certificates
• Secure firmware updates
• Security event log
2.4. Extended Smart Charging
In OCPP 2.0.1 Smart Charging functionality has been extended (compared to OCPP 1.6 [OCPP1.6]) to support:
• Direct Smart Charging inputs from an Energy Management System (EMS) to a Charging Station
• Improved Smart Charging with a local controller
• Support for integrated smart charging of the CSMS, Charging Station and EV ([ISO15118-1]).
5/13 Part 0 - Introduction
2.5. Support for ISO 15118
The ISO 15118 standard [ISO15118-1] is a newer protocol for EVSE to EV communication, compared to IEC 61851 [IEC61851-1]. ISO
15118 allows a lot of new features and more secure communication between EVSE and EV. OCPP 2.0.1 supports the ISO 15118
standard, the newly added features are:
• Plug & Charge
• Smart Charging including input from the EV
2.6. Improvements for customer experience
2.6.1. More authorization options
OCPP 1.x was designed (mainly) for Charging Stations that authorize an EV driver via an RFID card/token. If other authorization
systems or a mix of systems are used, the CSMS needs to know what system is used for which authorization. OCPP 2.0.1 has been
extended to support things like: 15118 Plug & Charge [ISO15118-1], Payment Terminals, local mechanical key, Smart-phones, etc.
2.6.2. Display Messages
This provides Charging Station Operators with the possibility to configure - from the CSMS - a message on a Charging Station to be
displayed to EV drivers. Messages can be transaction related or global.
2.6.3. EV Driver preferred languages
To be able to show messages to an EV driver in a language the driver understands best, OCPP 2.0.1 provides the possibility to send
the language preference of a driver to a Charging Station.
2.6.4. Tariff and Costs
OCPP 2.0.1 allows Charging Stations to show the applicable tariff/price before an EV driver starts charging, to show the running
total cost during a charging transaction and/or to show the final total cost after the transaction is finished.
2.7. Transport Protocols: OCPP-J Improvements
2.7.1. Simple Message routing
A description has been added on how to create a simple solution for OCPP message routing in, for example, a Local Controller. This
is defined in Part 4, Section 6: OCPP Routing.
2.7.2. No SOAP Support
OCPP 2.0.1 no longer supports SOAP as a transport protocol. This decision was taken by the OCA members, who believe that the
protocol does no longer lend itself for constrained computing resources that many Charging Stations operate under. The verbosity
of the protocol could lead to slower performance and requires a higher bandwidth, which, in many cases, leads to higher cellular
costs. SOAP is also difficult to support when communication is via local site networking.
6/13 Part 0 - Introduction
2.8. Minor changes/extensions
2.8.1. Renamed messages
In the OCPP 1.x series, the names of all messages were kept unchanged for backward compatibility, even though some message
names were found to be confusing or misleading in practice. In OCPP 2.0.1 message names have been changed, where
appropriate, to improve clarity and understanding.
Example: RemoteStartTransaction.req: a lot of implementers though it meant the Charging Station should start the transaction, but
in fact it is a request to try to start a transaction. However, for example, if no cable is plugged in, no transaction can be started.
Since the message was always intended to be a request, it has been changed to a more logical name:
RequestStartTransactionRequest.
2.8.2. TransactionId Identification & Message Sequencing
In OCPP 2.0, transaction identifiers are generated by the Charging Station, to facilitate offline charging sessions, in contrast to
OCPP 1.x, where transaction identifiers were generated at the CSMS and sent to the Charging Station. In addition, all messages
relating to a transaction are assigned incremental sequence numbering, to facilitate transaction data completeness checking at the
CSMS.
2.8.3. Extended enumerations
Many enumerations have been extended to support more use cases, provide more options etc.
2.8.4. Offline Transaction Event Indication
Charging Stations can optionally indicate in transaction messages that a transaction event occurred while the Charging Station was
Offline. This can assist a CSMS with the processing of transactions.
2.8.5. Personal message
Message that can be shown to the EV Driver and can be used for tariff information, user greetings and for indicating why a driver is
not authorized to charge. When a driver uses an authorization method (RFID for example) and the CSMS does not authorize the
driver to start charging, this field can thus contain additional reasons to provide the driver with a meaningful explanation why (s)he
is not allowed to charge.
7/13 Part 0 - Introduction
3. OCPP 2.0.1 Documentation Structure
3.1. Overview of Specification Parts
The overall structure of the standard has been improved, making the new specification easier to read, implement and test.
For readability and implementation purposes, OCPP 2.0.1 is divided in seven parts.
Table 2. Parts
Part 0 Introduction (this document)
Part 1 Architecture & Topology
Part 2
Specification:
Use Cases and Requirements, Messages, Data Types and Referenced Components and Variables
Appendices:
Security Events, Standardized Units of Measure, Components and Variables
Part 3 Schemas
Part 4 Implementation Guide JSON
Part 5 Certification Profiles
Part 6 Test Cases
In contrast to OCPP 1.6 [OCPP1.6], the OCPP 2.0.1 specification is written in a different structure, based on [IEC62559-2:2015]: "Use
case methodology - Part 2: Definition of the template for use cases, actor list and requirements list".
Part 2, the specification, is divided into 'Functional Blocks'. These Functional Blocks contain use cases and requirements.
Messages, Data Types and Referenced Components and Variables are described at the end of the document. The Appendices can
be found in the separate document: Part 2 - Appendices.
Messages and Data Types are structured in almost the same way as the previous OCPP specification [OCPP1.6].
8/13 Part 0 - Introduction
3.2. Functional Blocks
OCPP 2.0.1 consists of the following Functional Blocks.
Table 3. Functional Blocks
Clause Functional Block Title Description
A. Security This Functional Block describes a security specification for the OCPP
protocol.
B. Provisioning This Functional Block describes all the functionalities that help a CSO
provision their Charging Stations, allowing them to be registered and
accepted on their network and retrieving basic configuration information
from these Charging Stations.
C. Authorization This Functional Block describes all the authorization related functionality:
AuthorizeRequest message handling/behavior and Authorization Cache
functionality.
D. Local Authorization List Management This Functional Block describes functionality for managing the Local
Authorization List.
E. Transactions This Functional Block describes the basic OCPP Transaction related
functionality for transactions that are started/stopped on the Charging
Station.
F. Remote Control This Functional Block describes three types of use cases for remote control
management from the CSMS: Remote Transaction Control, Unlocking a
Connector and Remote Trigger.
G. Availability This functional Block describes the functionality of sending status
notification messages.
H. Reservation This Functional Block describes the reservation functionality of a Charging
Station.
I. Tariff and Cost This Functional Block provides tariff and cost information to an EV Driver,
when a Charging Station is capable of showing this on a display. Before a
driver starts charging tariff information needs to be given, detailed prices
for all the components that make up the tariff plan applicable to this driver
at this Charging Station. During charging the EV Driver needs to be shown
the running total cost, updated at a regular, fitting interval. When the EV
Driver stops charging the total cost of this transaction needs to be shown.
J. Metering This Functional Block describes the functionality for sending meter values,
on a periodic sampling and/or clock-aligned timing basis.
K. Smart Charging This Functional Block describes all the functionality that enables the CSO
(or indirectly a third party) to influence the charging current/power of a
charging session, or set limits to the amount of power/current a Charging
Station can offer to an EV.
L. Firmware Management This Functional Block describes the functionality that enables a CSO to
update the firmware of a Charging Station.
M. ISO 15118 Certificate Management This Functional Block provides the installation and update of ISO 15118
certificates.
N. Diagnostics This Functional Block describes the functionality that enables a CSO to
request and track the upload of a diagnostics file from a Charging Station,
and to manage the monitoring of Charging Station data.
O. Display Message With the DisplayMessage feature OCPP enables a CSO to display a
message on a Charging Station, that is not part of the firmware of the
Charging Station. The CSO gets control over these messages: the CSO can
set, retrieve (get), replace and clear messages.
P. Data Transfer This Functional Block describes the functionality that enables a party to add
custom commands to OCPP, enabling custom extension to OCPP.
9/13 Part 0 - Introduction
3.3. All Functional Blocks and use cases
The following table shows the full list of use cases supported by OCPP 2.0.1 and which use cases were already supported by OCPP
1.6 [OCPP1.6].
Clause Functional Block UC ID Use case name OCPP 1.6 New in
OCPP 2.0.1
A Security A01 Update Charging Station Password for HTTP o
Basic Authentication
A02 Update Charging Station Certificate by request of o
CSMS
A03 Update Charging Station Certificate initiated by o
the Charging Station
A04 Security Event Notification o
B Provisioning B01 Cold Boot Charging Station o
B02 Cold Boot Charging Station - Pending o
B03 Cold Boot Charging Station - Rejected o
B04 Offline Behavior Idle Charging Station o
B05 Set Variables o
B06 Get Variables o
B07 Get Base Report o
B08 Get Custom Report o
B09 Setting a new NetworkConnectionProfile o
B10 Migrate to new CSMS o
B11 Reset - Without Ongoing Transaction o
B12 Reset - With Ongoing Transaction o
C Authorization C01 EV Driver Authorization using RFID o
C02 Authorization using a start button o
C03 Authorization using credit/debit card o
C04 Authorization using PIN-code o
C05 Authorization for CSMS initiated transactions o
C06 Authorization using local id type o
C07 Authorization using Contract Certificates o
C08 Authorization at EVSE using ISO 15118 External o
Identification Means (EIM)
C09 Authorization by GroupId o
C10 Store Authorization Data in the Authorization o
Cache
C11 Clear Authorization Data in Authorization Cache o
C12 Start Transaction - Cached Id o
C13 Offline Authorization through Local Authorization o
List
C14 Online Authorization through Local Authorization o
List
C15 Offline Authorization of unknown Id o
C16 Stop Transaction with a Master Pass o
D LocalAuthorizationList D01 Send Local Authorization List o
D02 Get Local List Version o
E Transactions E01 Start Transaction Options o
E02 Start Transaction - Cable Plugin First o
E03 Start Transaction - IdToken First o
E04 Transaction started while Charging Station is o
offline
10/13 Part 0 - Introduction
Clause Functional Block UC ID Use case name OCPP 1.6 New in
OCPP 2.0.1
E05 Start Transaction - Id not Accepted o
E06 Stop Transaction Options o
E07 Transaction locally stopped by IdToken o
E08 Transaction stopped while Charging Station is o
offline
E09 When cable disconnected on EV-side: Stop o
Transaction
E10 When cable disconnected on EV-side: Suspend o
Transaction
E11 Connection Loss During Transaction o
E12 Inform CSMS of an Offline Occurred Transaction o
E13 Transaction related message not accepted by o
CSMS
E14 Check transaction status o
E15 End of charging process o
F RemoteControl F01 Remote Start Transaction - Cable Plugin First o
F02 Remote Start Transaction - Remote Start First o
F03 Remote Stop Transaction o
F04 Remote Stop ISO 15118 charging from CSMS o
F05 Remotely Unlock Connector o
F06 Trigger Message o
G Availability G01 Status Notification o
G02 Heartbeat o
G03 Change Availability EVSE o
G04 Change Availability Charging Station o
G05 Lock Failure o
H Reservation H01 Reservation o
H02 Cancel Reservation o
H03 Use a reserved EVSE o
H04 Reservation Ended, not used o
I Tariff and Costs I01 Show EV Driver-specific tariff information o
I02 Show EV Driver running total cost during charging o
I03 Show EV Driver final total cost after charging o
I04 Show fallback tariff information o
I05 Show fallback total cost message o
I06 Update Tariff Information During Transaction o
J Metering J01 Sending Meter Values not related to a transaction o
J02 Sending transaction related Meter Values o
J03 Charging Loop with metering information o
exchange
K SmartCharging K01 SetChargingProfile o
K02 Central Smart Charging o
K03 Local Smart Charging o
K04 Internal Load Balancing o
K05 Remote Start Transaction with Charging Profile o
K06 Offline Behavior Smart Charging During o
Transaction
K07 Offline Behavior Smart Charging at Start of o
Transaction
K08 Get Composite Schedule o
11/13 Part 0 - Introduction
Clause Functional Block UC ID Use case name OCPP 1.6 New in
OCPP 2.0.1
K09 Get Charging Profiles o
K10 Clear Charging Profile o
K11 Set / Update External Charging Limit With o
Ongoing Transaction
K12 Set / Update External Charging Limit Without o
Ongoing Transaction
K13 Reset / release external charging limit o
K14 External Charging Limit with Local Controller o
K15 Charging with load leveling based on High Level o
Communication
K16 Optimized charging with scheduling to the CSMS o
K17 Renegotiating a Charging Schedule o
L Firmware Management L01 Secure Firmware Update o
L02 Non-Secure Firmware Update o
L03 Publish Firmware file on Local Controller o
L04 Unpublish Firmware file on Local Controller o
M ISO 15118 Certificate M01 Certificate Installation EV o
Management
M02 Certificate Update EV o
M03 Retrieve list of available certificates from a o
Charging Station
M04 Delete a specific certificate from a Charging o
Station
M05 Install CA certificate in a Charging Station o
M06 Get Charging Station Certificate status o
N Diagnostics N01 Retrieve Log Information o
N02 Get Monitoring report o
N03 Set Monitoring Base o
N04 Set Variable Monitoring o
N05 Set Monitoring Level o
N06 Clear / Remove Monitoring o
N07 Alert Event o
N08 Periodic Event o
N09 Get Customer Information o
N10 Clear Customer Information o
O Display Message O01 Set DisplayMessage o
OO2 Set DisplayMessage for Transaction o
O03 Get All DisplayMessages o
O04 Get Specific DisplayMessages o
O05 Clear a DisplayMessage o
O06 Replace DisplayMessage o
P DataTransfer P01 Data Transfer to the Charging Station o
P02 Data Transfer to the CSMS o
OCPP is used in many different regions and for many different charging solutions. Not all functionalities offered
by OCPP 2.0.1 will be applicable to all implementations. Implementers can decide what specific functionalities
NOTE
apply to their charging solution.
For interoperability purposes, the Open Charge Alliance introduces Certification Profiles in Part 5 of the
specification.
12/13 Part 0 - Introduction
4. Basic implementation of OCPP 2.0.1
This section is informative.
The OCPP protocol describes a large number of use cases and messages, which are not all needed to implement a basic Charging
Station or CSMS. The table below lists messages that are typically implemented to deliver basic functionality for an OCPP managed
Charging Station. The purpose of this list is to guide developers that are new to OCPP.
Please note: this table does not define what needs to be done to become OCPP 2.0.1 "certified". The functionality that is to be
implemented to become OCPP 2.0.1 certified is described in Part 5 of the specification, "Certification Profiles".
Table 4. OCPP 2.0.1 Basic Implementation
Functionality Use cases Messages
Booting a Charging Station B01-B04 BootNotification
Configuring a Charging Station B05-B07 SetVariables, GetVariables and GetReportBase (respond
correctly to requests with reportBase = ConfigurationInventory,
FullInventory and SummaryInventory).
Resetting a Charging Station B11-B12 Reset
Authorization options One of C01, C02 and C04 Authorize
Transaction mechanism E01 (one of S1-S6), E02-E03, TransactionEvent
E05, E06 (one of S1-S6), E07-
E08, One of E09-E10, E11-E13
Availability G01, G03-G04 Only ChangeAvailability and StatusNotification.
Monitoring Events G05, N07 A basic implementation of the NotifyEvent message to be used
to report operational state changes and problem/error
conditions of the Charging Station, e.g. for Lock Failure. Also
used for reporting built-in monitoring events.
Sending transaction related J02 TransactionEvent
Meter values
DataTransfer P01-P02 Any OCPP implementations should at least be able to reject any
request for DataTransfer if no (special) functionality is
implemented.
NOTE Please also refer to the section on Minimum Device Model in part 1.
13/13 Part 0 - Introduction
OCPP 2.0.1
Part 1 - Architecture & Topology
Edition 3 FINAL, 2024-05-06
Table of Contents
Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
Version History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.1. Goal of this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.2. Terms and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
2. 3-tier model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
3. Information Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
4. Device Model: Addressing Components and Variables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
4.1. Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
4.2. Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
4.3. Characteristics and Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
4.4. Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
4.5. Standardized lists of Components and Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
4.6. Minimum Device Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
5. Information Model vs. Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
6. Using OCPP for other purposes than EV charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
7. Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
7.1. EVSE numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
7.2. Connector numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
7.3. Transaction IDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
8. Topologies supported by OCPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
8.1. Charging Station(s) directly connected to CSMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
8.2. Multiple Charging Stations connected to CSMS via Local Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
8.3. Multiple Charging Stations connected to CSMS via Local Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
8.4. Non-OCPP Charging Stations connected to CSMS via OCPP Local Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
8.5. DSO control signals to CSMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
8.6. Parallel control by CSMS and EMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
9. Part 1 Appendix: OCPP Information Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
9.1. Explanation of UML representation and message generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
9.2. Visual Representation of OCPP Information Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19

Disclaimer
The OCA hereby grants to IEC a license to fully exploit the OCPP for commercial and non-commercial purposes and to permit IEC
National Committees to nationally adopt and translate OCPP under the applicable IEC policies. Notwithstanding the foregoing, IEC is
not entitled to share adapted, altered, transformed o
...