ISO/IEC 14543-4-302:2023

ISO/IEC 14543-4-302
Edition 1.0 2023-04
INTERNATIONAL
STANDARD
colour
inside
Information technology – Home electronic system (HES) architecture –
Part 4-302: Application protocols for electrical storage systems and controllers

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ISO/IEC 14543-4-302
Edition 1.0 2023-04
INTERNATIONAL
STANDARD
colour
inside
Information technology – Home electronic system (HES) architecture –

Part 4-302: Application protocols for electrical storage systems and controllers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.240.67 ISBN 978-2-8322-6793-6

– 2 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 9
4 Conformance . 10
5 Configuration . 10
5.1 General . 10
5.2 Configuration and components . 10
5.3 Connection configuration . 11
6 Application layer . 12
6.1 General . 12
6.2 NECD objects . 12
6.3 NECD services. 12
6.4 Object-specific NECD properties . 12
6.5 Application operation . 14
6.5.1 General . 14
6.5.2 Continuous requests . 14
6.5.3 Response wait time value for controllers . 15
6.5.4 Resending a frame . 15
6.5.5 Processing object property counter . 15
6.5.6 Property values of write requests . 15
7 Normal operation . 16
7.1 General . 16
7.2 Start-up operation . 18
7.2.1 General . 18
7.2.2 Start-up processing of NECD nodes . 18
7.2.3 Search processing . 18
7.2.4 Obtaining NECD attribute information . 18
7.2.5 Obtaining electrical storage system attribute information . 19
7.3 Occasional operation . 22
7.3.1 General . 22
7.3.2 Obtaining electrical storage system status . 22
7.3.3 Setting and updating "AC charge amount target value" property (or "AC
discharge amount target value" property). 25
7.3.4 Setting and updating "Charging electric power setting" property (or
"Discharging electric power setting" property) (optional) . 28
7.3.5 Setting "Charging method" property (or "Discharging method" property)
(optional) . 31
7.3.6 Setting "Operation mode setting" property . 34
7.3.7 Terminating charging (or discharging) operation of the storage battery
based on "AC charging amount target value" property (or "AC
discharging amount target value" property) . 37
7.4 Fault status notification . 41
8 Remote control . 42

© ISO/IEC 2023
8.1 General . 42
8.2 Setting and updating "AC charge amount target value" property (or "AC
discharge amount target value" property) on remote control . 42
8.3 Setting "Operation mode setting" property when remotely controlling . 44
9 Considerations on controllers . 46
9.1 General . 46
9.2 Restrictions by electrical storage system implementations . 47
Annex A (informative) Terms and NECD protocol frame format on ISO/IEC 14543-4-3
and IEC 62394 . 48
A.1 Terms correspondence between ISO/IEC 14543-4-3 and IEC 62394 . 48
A.2 NECD protocol frame format . 48
Annex B (informative) Relationship between ISO/IEC 14543-4 series and the HES
gateway, based on ISO/IEC 15045 series and ISO/IEC 18012 series . 50
Bibliography . 51

Figure 1 – Relationship between IEC 62394, ISO/IEC 14543-4-3 and
ISO/IEC 14543‑4‑302 . 7
Figure 2 – Example of electrical storage system configuration and components . 10
Figure 3 – Connection configurations . 11
Figure 4 – Assumed network stack . 11
Figure 5 – Summary of normal operation sequences . 17
Figure 6 – Sequence for obtaining NECD attribute information . 19
Figure 7 – Sequence of obtaining electrical storage system attribute information . 21
Figure 8 – Sequence to obtain status of electrical storage systems . 25
Figure 9 – Sequence for setting "AC charge amount target value" property (or "AC
discharge amount target value" property) . 28
Figure 10 – Sequence for setting "Charging electric power setting" property (or
"Discharging electric power setting" property) . 31
Figure 11 – Sequence for setting "Charging method" property (or "Discharging method"
property) . 33
Figure 12 – Sequence for setting "Charging method" property (or "Discharging method"
property) when no response is received from the storage battery . 34
Figure 13 – Sequence for setting "Operation mode setting" property . 36
Figure 14 – Sequence for setting "Operation mode setting" property when no response
is received from the storage battery . 37
Figure 15 – Sequence of terminating charging (discharging) operation based on "AC
charge amount target value" property ("AC discharge amount target value" property) . 40
Figure 16 – Sequence of terminating charge (discharge) operation based on "AC
charge amount target value" property ("AC discharge amount target value" property)
when "Operation mode setting" property is changed . 41
Figure 17 – Remote control . 42
Figure 18 – Example of setting sequence for "AC charge amount target value" property
("AC discharge amount target value" property) when "Remote control setting" property
is used . 44
Figure 19 – Example of setting sequence for "Operation mode setting" property when
"Remote control setting" property is used . 45
Figure 20 – Example of setting sequence for "Operation mode setting" property when
"Remote control setting" property is used, in case that no response is made by
electrical storage system . 46

– 4 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
Figure A.1 – NECD protocol frame format . 49

Table 1 – NECD objects . 12
Table 2 – NECD services . 12
Table 3 – NECD properties of device object (super class) . 13
Table 4 – NECD properties of device object . 13
Table 5 – Response wait time values for controllers . 15
Table 6 – Re-set wait time for the AC charge (or discharge) amount target value . 27
Table 7 – Wait time for re-setting charging and discharging electric power setting . 30
Table 8 – Wait time for charging and discharging method for re-setting . 32
Table 9 – Wait time for re-setting operation mode . 35
Table A.1 – Terms correspondence table between ISO/IEC 14543-4-3 and IEC 62394 . 48
Table B.1 – Partial list of the translation between ISO/IEC 14543-4-302 and
HES gateway lexicon (ISO/IEC 18012‑3) . 50

© ISO/IEC 2023
INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) ARCHITECTURE –

Part 4-302: Application protocols for electrical
storage systems and controllers

FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
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2) The formal decisions or agreements of IEC and ISO on technical matters express, as nearly as possible, an
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3) IEC and ISO documents have the form of recommendations for international use and are accepted by IEC and
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8) Attention is drawn to the Normative references cited in this document. Use of the referenced publications is
indispensable for the correct application of this document.
9) Attention is drawn to the possibility that some of the elements of this ISO/IEC document may be the subject of
patent rights. IEC and ISO shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 14543-4-302 has been prepared by subcommittee 25: Interconnection of information
technology equipment, of ISO/IEC joint technical committee 1: Information technology. It is an
International Standard.
The list of all currently available parts of the ISO/IEC 14543 series, under the general title
Information technology – Home Electronic System (HES) architecture, can be found on the IEC
website and ISO website.
The text of this International Standard is based on the following documents:
Draft Report on voting
JTC1-SC25/3100/CDV JTC1-SC25/3130/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
– 6 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
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, available at www.iec.ch/members_experts/refdocs
and www.iso.org/directives.
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.

© ISO/IEC 2023
INTRODUCTION
This part of ISO/IEC 14543 specifies the detailed procedures and behaviours of both electrical
storage systems and controllers at the application level of communications based on
ISO/IEC 14543-4-3. This document specifies the message structure, sequences and protocol
of the application layer for networked enhanced control devices used in the Home Electronic
System (HES). Some services are targeted for communications between devices. Other
services are exclusively reserved for management purposes. Some services can be used for
both management and run-time communications. This document is applicable for energy
management services involving storage batteries, inverters, chargers and related devices.
Figure 1 shows the relationship among IEC 62394, ISO/IEC 14543-4-3 and
ISO/IEC 14543-4-302. ISO/IEC 14543-4-3 specifies the message structure, sequences and
protocol for general-purpose communications used in network enhanced control devices of the
Home Electronic System (HES) Class 1. ISO/IEC 14543-4-3 provides the common interfaces
for the use-level process and the services such as energy management, remote maintenance,
and other services for easily building a system consisting of multi-vendor devices and
equipment. IEC 62394 specifies the detailed lists of control commands on NECD objects
(see ISO/IEC 14543-4-3). Annex A shows terms and NECD protocol frame format on
ISO/IEC 14543-4-3 and IEC 62394.

Figure 1 – Relationship between IEC 62394, ISO/IEC 14543-4-3 and ISO/IEC 14543‑4‑302
ISO/IEC 14543-4-3 is a general-purpose communications specification that applies to a variety
of devices. ISO/IEC 14543-4-3 is the basis for this document, which specifies detailed
procedures and behaviours for pre-packaged system solutions that include storage batteries,
inverters, chargers and related devices. The procedures and behaviours specified in this
document can be used for energy flow inside a home or energy flow between the grid and a
home.
In order to enhance interoperability, it is important to specify how to implement
ISO/IEC 14543-4-3 for each device and controller at the application level such as command
sequences, timeout requirements, required combinations of acceptable commands, etc.

– 8 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) ARCHITECTURE –

Part 4-302: Application protocols for electrical
storage systems and controllers

1 Scope
This part of ISO/IEC 14543 specifies an application-layer protocol important for ensuring
interoperability among the products of various manufacturers regarding communications
between electrical storage systems and controllers. It uses the network enhanced
communications device (NECD) protocol specified in ISO/IEC 14543-4-3. This protocol is based
on UDP using IPv4 or IPv6 (TCP is optional).
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.
ISO/IEC 14543-4-3, Information technology – Home Electronic System (HES) architecture –
Part 4-3: Application layer interface to lower communications layers for network enhanced
control devices of HES Class 1
IEC 62394, Service diagnostic interface for consumer electronics products and networks –
Implementation for ECHONET
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document the following terms and definitions 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
3.1.1
battery management unit
BMU
device that manages packs and cells
Note 1 to entry: Examples of management functions: monitoring state, calculating, checking environment, balancing,
etc.
3.1.2
cell
device that can be charged and discharged repeatedly
Note 1 to entry: The typical residential device is a lithium ion battery.

© ISO/IEC 2023
3.1.3
device object
network enhanced control device (NECD) object other than a node profile object
Note 1 to entry: In this document, "device object" refers to storage battery object only.
3.1.4
electrical storage system
combination of devices that include single or multiple power conditioning systems (PCSs),
battery management units (BMUs), and packs to support primarily residential applications,
including a communications interface
3.1.5
NECD protocol
protocol used in network enhanced control device (NECD) communications
3.1.6
node profile
description of objects implemented in each node
3.1.7
pack
combination of cells
3.1.8
power conditioning system
PCS
device that charges and discharges cells, and translates DC voltage of cells to AC voltage
(e.g. inverter), and AC voltage to DC voltage (e.g. charger) of cells
3.1.9
remote control
control from outside the home
3.1.10
response wait time
time between a controller request to and the response from an electrical storage system
3.1.11
super class
properties that are inherited and implemented in all device objects
3.2 Abbreviations
BMU battery management unit
DNOJ destination NECD object
IP internet protocol
NDATA NECD data
NDT NECD property value data
NECD network enhanced control device
NHD NECD header
NPC NECD property code
NSV NECD service
OPC processing object property counter
PCS power conditioning system
– 10 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
PDC property data counter
SNOJ source NECD object
TID transaction ID
UDP user datagram protocol
4 Conformance
Electrical storage systems and controllers of HES Class 1 that claim conformance to this
document shall:
– send, receive and process sequences and procedures as specified in Clause 7.
– provide application services and properties specified in 6.2, 6.3 and 6.4 as needed by
electrical storage systems and controllers for which the application is intended.
5 Configuration
5.1 General
Clause 5 specifies the configuration and components of an electrical storage system, and
connection configurations between an electrical storage system and a controller.
5.2 Configuration and components
Figure 2 shows an example of an electrical storage system configuration and components. An
electrical storage system basically includes the device or function of a power conditioning
system (PCS), a battery management unit (BMU), and one or more packs. The electrical storage
system includes the ISO/IEC 14543-4-302 data communications function on the PCS or BMU
in many cases.
Figure 2 – Example of electrical storage system configuration and components

© ISO/IEC 2023
5.3 Connection configuration
This specification is necessary for ensuring interoperability between the products of different
manufacturers in connection with application communications between electrical storage
systems and controllers, using the NECD protocol as an application protocol via UDP
(TCP)/IPv6 communications.
Figure 3 shows the configurations assumed under this specification.

a
"Storage battery class object" is a device object specified in IEC 62394.
Figure 3 – Connection configurations
The upper illustration in Figure 3 shows the case where a single device object is installed in a
single node. The lower illustration shows the case where multiple device objects are installed
in a single node. The latter case occurs when multiple battery units are attached to a single
communications unit. In this case, there are multiple storage battery class objects in a single
electrical storage system node (i.e. at a single IP address). Controllers shall support nodes that
configure multiple device objects in a single node.
Controllers shall be capable of handling multiple nodes and objects. The maximum number of
nodes and objects to be handled is implementation-dependent on the controllers. When multiple
controllers are connected to a single system, some electrical storage systems cannot accept a
request from a controller for a certain period of time after the electrical storage system received
a request from another controller.
Figure 4 shows the assumed network stack for operating the NECD protocol in this document.
NECD protocol operation is assumed as an application protocol on UDP(TCP)/IPv6. Note that
TCP installation is optional. As a rule, the stack uses IPv6; however, IPv4 is allowed depending
on the market trends for migration from IPv4 to IPv6.

a
Depends on transmission media using IPv6.
Figure 4 – Assumed network stack

– 12 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
Connection processing specific to each lower layer communications medium that is necessary
in advance of the start of NECD communications is out of the scope of this document. In this
document, application communications using the NECD protocol are specified on the
assumption that connection processing specific to those communications media is complete.
6 Application layer
6.1 General
The NECD protocol shall be used at the application layer. All nodes that conform to this
document shall support all mandatory functions specified in ISO/IEC 14543-4-3.
6.2 NECD objects
Electrical storage systems and controllers shall have the NECD objects shown in Table 1.
Table 1 – NECD objects
Class group
NECD object Class code Class name Instance code
code
0x02 0x7D Storage battery 0x01 to 0x7F
Electrical storage system
0x0E 0xF0 Node profile 0x01
0x05 0xFF Controller 0x01 to 0x7F
Controller
0x0E 0xF0 Node profile 0x01
NOTE Instance code 0x00 is designated to specify all instances of the same class in a node.
6.3 NECD services
Electrical storage systems and controllers shall support the NECD services shown in Table 2.
Table 2 – NECD services
NSV code NECD service content Symbol
0x51 Property value write "response-not-possible" response SetC_SNA
0x52 Property value read "response-not-possible" response Get_SNA
0x61 Property value write request (response required) SetC
0x62 Property value read request Get
0x71 Property value write response Set_Res
0x72 Property value read response Get_Res
0x73 Property value notification INF

NOTE NSV codes which are specified in ISO/IEC 14543-4-3 but are not shown in Table 2 (0x60, 0x63, 0x6E, 0x74,
0x7A, 0x7E, 0x50, 0x53, and 0x5E) are not subject to the certification tests based on this document.
6.4 Object-specific NECD properties
Electrical storage systems shall install the NECD properties of a device object shown in Table 3
and Table 4. NECD properties of a node profile object shall support at least the mandatory
properties.
© ISO/IEC 2023
Controllers shall send requests to the device object properties shown in Table 3 and Table 4.
If a controller can control electrical storage systems via a public network, the remote control
operations that set properties of storage batteries shall include SetC [0x61] to "Remote control
setting" property [0x93].
Table 3 – NECD properties of device object (super class)
Access rule
Announcement at
Property name NPC Units Remarks
status change
Get Set
Installation location 0x81 － M M M
Standard version information 0x82 － M － －
Fault status 0x88 － M － M
Manufacturer code 0x8A － M － －
Remote control setting 0x93 － O O －
Status change announcement
0x9D － M － －
property map
Set property map 0x9E － M － －
Get property map 0x9F － M － －
M: mandatory, O: optional, －: not supported

Table 4 – NECD properties of device object
Access rule
Announcement at
Property name NPC Units Remarks
status change
Get Set
Operation status 0x80 － M － M
－ － －
Identification number 0x83 M
Current time setting 0x97 － M － －
Current date setting 0x98 － M － －
AC effective capacity (charging) 0xA0 Wh M － － AC
AC effective capacity (discharging) 0xA1 Wh M － － AC
AC chargeable capacity 0xA2 Wh M － － AC
AC dischargeable capacity 0xA3 Wh M － － AC
AC chargeable electric energy 0xA4 Wh M － － AC
－ －
AC dischargeable electric energy 0xA5 Wh M AC
0,001
AC cumulative charging electric energy 0xA8 M － － AC
kWh
0,001
AC cumulative discharging electric
0xA9 M － － AC
energy
kWh
AC charge amount target value 0xAA Wh M M M AC
AC discharge amount target value 0xAB Wh M M M AC
Charging method 0xC1
－ M O M
Discharging method 0xC2 －
M O M
Minimum and maximum charging
0xC8 W M － － AC
electric power
Minimum and maximum discharging
0xC9 W M － － AC
electric power
a, b
Working operation status 0xCF － M － M

– 14 – ISO/IEC 14543-4-302:2023
© ISO/IEC 2023
Access rule
Announcement at
Property name NPC Units Remarks
status change
Get Set
a, b
Operation mode setting 0xDA － M M M

－ － －
System-interconnected type 0xDB M
c
Remaining stored electricity 1 0xE2 Wh M － －
DC
c
Remaining stored electricity 2 0xE3 0,1 Ah M － －
DC
c
Remaining stored electricity 3 0xE4 % M － －

Battery type 0xE6 － M － －
Rated electric energy 0xD0 Wh O － － DC
Rated capacity 0xD1 0,1 Ah O － － DC
Rated voltage 0xD2 V O － － DC
Instantaneous charging and
－ －
0xD3 W O AC
discharging electric power
Charging electric power setting －
0xEB W O O AC
Discharging electric power setting 0xEC W O O － AC
M: mandatory, O: optional, －: not supported
a
Property values of "Charging", "Discharging", and "Standby" are mandatory.
b
When "Operation mode setting" property [0xDA] is set as "Auto", the property value of "Working operation
status" property [0xCF] should be set as "Charging", "Discharging", or "Standby", depending on the actual
status of the storage battery.
c
One of them is mandatory.
The details of the properties shown in Table 3 and Table 4 are specified in IEC 62394 "Storage
battery class specifications". If a discrepancy between IEC 62394 and this document exists, the
description in this document applies.
Electrical storage systems may not operate as set on "Operation mode setting" property [0xDA]
depending on the system status of the electrical storage system. The actual status of the
electrical storage system (charging or discharging, etc.) should be set on "Working operation
status" property [0xCF] and the value of "Operation mode setting" property [0xDA] should not
be changed in this case.
Fault status of electrical storage systems shall be shown when using the standardized "Fault
status" property [0x88]. Electrical storage systems may describe details of the fault status by
using other fault NECD properties ("Manufacturer’s fault code" property [0x86] and "Fault
description" property [0x89]) as specified in IEC 62394.
6.5 Application operation
6.5.1 General
Subclauses 6.5.2 to 6.5.6 specify the operations on electrical storage systems and controllers
at the application level.
6.5.2 Continuous requests
A request from a controller and the corresponding response from an electrical storage system
is a basic unit of communications, i.e. an electrical storage system returns a single response to
a single request. Controllers that issue continuous requests to an electrical storage system
shall be designed with a response wait time defined in Table 5. When receiving a response, the
time is reset and the controller can send a new request.

© ISO/IEC 2023
If a controller resends or continuously sends requests in an interval shorter than a response
wait time value specified in Table 5, electrical storage systems may not accept the requests,
may not renew the values to respond, or may not be able to renew the values correctly. Note
that the "continuous requests" means continued requests to the same instance in the same
electrical storage system node.
6.5.3 Response wait time value for controllers
The values of response wait times, which count the time from a controller’s request until the
response from the targeted electrical storage system, are specified in Table 5.
Table 5 – Response wait time values for controllers
Parameter name Value Remarks
Response wait time 1 At least 5 [s] For SetC
Response wait time 2 At least 20 [s] For Get

Note that electrical storage systems shall respond within the time specified in Table 5, in case
the received request’s OPC is 1 or in case the electrical storage system processes operations
specified in Clause 7 only. In case the request’s DNOJ instance code is all-instance designation
code [0x00], the targeted electrical storage system shall return the first response frame within
the time specified in Table 5.
6.5.4 Resending a frame
If a controller sends a request to an electrical storage system and does not receive the response
from the electrical storage system within the response wait time value specified in Table 5, the
frame shall not be retransmitted in a frame of the same TID. In this case controllers may resend
a message with a different TID.
6.5.5 Processing object property counter
Electrical storage systems shall be capable of supporting OPC value of 11 or more. Electrical
storage systems shall process operations with an OPC value of 11 as specified in Clause 7
only. Electrical storage systems may not process operations with any combination of NPCs up
to 11.
The order of NPCs of the response to a request with multiple NPCs shall be the same as the
request. Controllers shall support receiving INF [0x73] with multiple NPCs.
6.5.6 Property values of write requests
When controllers issue a SetC [0x61] request, a value outside the range of properties required
by IEC 62394 shall not be set.
Electrical storage systems shall send SetC_SNA [0x51] when receiving the request SetC [0x61]
from the controllers to properties indicating functions, if the setting values are those not installed
on the actual devices. When the setting values are installed on the actual devices, Set_Res
[0x71] shall be basically sent as an acceptance response. However, SetC_SNA [0x51] may be
sent if there is no response to a set value during specific operations such as autonomous
operation or maintenance mode.
Electrical storage systems should send Set_Res [0x71] as an acceptance response, after
setting a value rounded to the highest or lowest value of the value range installed on the actual
devices as a property value, when receiving SetC [0x61] request from controllers to properties
indicating a continued value, if the set value is within the defined range of IEC 62394. When
the setting values are within the range of values installed on the actual devices, Set_Res [0x71]
shall be sent as an acceptance response.

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© ISO/IEC 2023
If other requests are received within a specified time after receiving a request, electrical storage
systems may not always send a response, depending on the process execution status of the
devices.
Responses from electrical storage systems are acceptance responses. Therefore, controllers
should check electrical storage system status after a specified period of time, even when
receiving Set_Res [0x71], using announcement at status change from electrical storage
systems or a Get [0x62] request to electrical storage systems.
7 Normal operation
7.1 General
Clause 7 specifies the normal operation sequence between electrical storage systems and
controllers.
Figure 5 shows the summary of normal operation sequences between an electrical storage
system and a controller. Here, the connection process of the lower-layer network between
electrical storage system and controller is assumed completed.

© ISO/IEC 2023
Figure 5 – Summary of normal operation sequences

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© ISO/IEC 2023
7.2 Start-up operation
7.2.1 General
Subclauses 7.2.2 to 7.2.5 specify the operations on electrical storage systems and controllers
at start-up.
7.2.2 Start-up processing of NECD nodes
After establishing a connection to a lower-layer network, electrical storage systems and
controllers notify each instance list.
Instance list notification may include:
a) one node and one instance;
b) one node and multiple instances of a class;
c) one node and instances of multiple different classes.
In any case, controllers shall be able to recognize the devices to be managed upon receiving
an instance list notification.
1) Target property of node profile object
• 0xD5: Instance list notification
7.2.3 Search processing
Controllers shall have a process to search electrical storage systems in preparation for cases
where controllers fail to receive the instance list notifications sent from electrical storage
systems at start-up. Controllers shall send Get [0x62] via multicast with DNOJ as storage
battery object, with all-instance designation code [0x00], and with "Operation status" property
[0x80]. Alternatively, controllers may send Get [0x62] via multicast with DNOJ as node profile
object [0x0EF001] and its "Self-node instance list S" property [0xD6].
1) Target property of storage battery object
• 0x80: Operation status
7.2.4 Obtaining NECD attribute information
After receiving instance list notifications from electrical storage systems or after completing a
search for electrical storage systems, controllers request NECD attribute information necessary
for NECD communications. Controllers may re-obtain the NECD attribute information if
necessary.
Controllers should confirm "Standard version information" property [0x82] and properties
installed on the electrical storage systems based on the NECD attribute information, and then
should issue requests to the installed properties.
1) Target properties of storage battery object
• 0x82: Standard version information
• 0x9D: Status change announcement property map
• 0x9E: Set property map
• 0x9F: Get property map
2) Sequence
Figure 6 shows the sequence for obtaining NECD attribute information.
a) Controller requests four target properties (in any combination or in any order) by
Get [0x62], after receiving an instance list notification from the target electrical storage
system.
© ISO/IEC 2023
b) The electrical storage system shall return Get_Res [0x72].

Figure 6 – Sequence for obtaining NECD attribute information
7.2.5 Obtaining electrical storage system attribute information
After receiving NECD attribute information from electrical storage systems, controllers request
attribute information, etc. from electrical storage systems. Controllers may re-obtain the
electrical storage system attribute information if necessary.
1) Target properties of storage battery object
a) Group1
• 0x80: Operation status
• 0x88: Fault status
• 0x8A: Manufacturer code
• 0xCF: Working operation status
• 0xD0: Rated electric energy [optional]
• 0xD1: Rated capacity [optional]
• 0xD2: Rated voltage [optional]
• 0xE2: Remaining stored electricity 1*
• 0xE3: Remaining stored electricity 2*
• 0xE4: Remaining stored electricity 3*
• 0xE6: Battery type
* One of the three shall be installed.
b) Group2
• 0x83: Identification number
• 0x97: Current time setting
• 0x98: Current date setting
• 0xA0: AC effective capacity (charging)
• 0xA1: AC effective capacity (discharging)
• 0xA2: AC chargeable capacity

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© ISO/IEC 2023
• 0xA3: AC dischargeable capacity
• 0xC1: Charging method
• 0xC2: Discharging method
• 0xC8: Minimum and maximum charging electric power
• 0xC9: Minimum and maximum discharging electric power
2) Sequence
Figure 7 shows the sequence for obtaining electrical storage system attribute information.
a) Controllers request the target properties (in any combination or in any ord
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