IEC 62026-2:2008

Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 2: Actuator sensor interface (AS-i)

IEC 62026-2:2008 specifies a method for communication between a single control device and switching elements, and establishes a system for the interoperability of components with the specified communication interfaces. The complete system is called "Actuator Sensor interface (AS-i)". This second edition of IEC 62026-2 cancels and replaces the first edition published in 2000. It constitutes a technical revision. The main changes with respect to the previous edition are listed below:
- doubling the number of slaves from 31 to 62 by introduction of sub-addresses;
- introduction of AS-I safety system.

Appareillage à basse tension - Interfaces appareil de commande-appareil (CDI) - Partie 2: Interface capteur-actionneur (AS-i)

La CEI 62026-2:2008 spécifie une méthode de communication entre un seul appareil de commande et des éléments de commutation. Elle établit un système d'interopérabilité pour les composants équipés des interfaces de communication spécifiées. Le système complet est appelé "Interface capteur-actionneur (AS-i)". Cette deuxième édition de la CEI 62026-2 annule et remplace la première édition parue en 2000. Cette deuxième édition constitue une révision technique. Les principales modifications apportées par rapport à l'édition précédente sont indiquées ci-dessous:
- doublement du nombre d'esclaves, passant de 31 à 62, par l'introduction de sous-adresses;
- introduction du système de sécurité AS-I. La présente version bilingue, publiée en 2009-08, correspond à la version anglaise. La version française de cette norme n'a pas été soumise au vote.

General Information

• Status: Published
• Publication Date: 28-Jan-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: WG 3 - TC 121/SC 121A/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jan-2008
• Completion Date: 29-Jan-2008

Relations

• Amended By: IEC 62026-2:2008/AMD1:2019 - Amendment 1 - Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 2: Actuator sensor interface (AS-i)
• Effective Date: 05-Sep-2023
• Revises: IEC 62026-2:2000 - Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 2: Actuator sensor interface (AS-i)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62026-2
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 62026-2
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XH
ICS 29.130.20 ISBN 2-8318-9512-X

– 2 – 62026-2 © IEC:2008(E)
CONTENTS
FOREWORD.7

1 Scope and object.9
2 Normative references.9
3 Terms, definitions, symbols and abbreviations.11
4 Classification.18
4.1 Overview.18
4.2 Components and interfaces .19
5 Characteristics.21
5.1 Overview.21
5.2 Signal characteristics .21
5.3 Power and data distribution .23
5.4 AS-i topology and other components .25
5.5 Communication.27
5.6 AS-i single transactions.30
5.7 AS-i combined transactions .42
5.8 AS-i error detection .59
6 Product information .60
6.1 Instructions for installation, operation and maintenance .60
6.2 Profiles.60
6.3 Marking.61
7 Normal service, mounting and transport conditions.62
7.1 Normal service conditions .62
7.2 Conditions during transport and storage .62
7.3 Mounting.63
8 Constructional and performance requirements.63
8.1 AS-i transmission medium.63
8.2 AS-i power supply.66
8.3 AS-i repeater and other components .68
8.4 AS-i slave.69
8.5 AS-i master.85
8.6 Electromagnetic compatibility (EMC) .89
9 Tests.90
9.1 Kinds of tests.90
9.2 Test of transmission medium .91
9.3 Test of the AS-i power supply.92
9.4 Test of an AS-i repeater and other components.98
9.5 Test of an AS-i slave .106
9.6 Test of a AS-i master.120

Annex A (normative) Slave profiles .135
Annex B (normative) Master profiles .213

Figure 1 − AS-i components and interfaces.19
Figure 2 − Transmission coding .21

62026-2 © IEC:2008(E) – 3 –
Figure 3 − Receiver requirements .23
Figure 4 − AS-i power supply .24
Figure 5 − Equivalent schematic of symmetrization and decoupling circuit .25
Figure 6 − Model of the AS-i transmission medium.26
Figure 7 − Transactions .28
Figure 8 − Master and slave pause as viewed from master/slave point of view.28
Figure 9 − Representation of the master pause.29
Figure 10 − Structure of a master request .31
Figure 11 − Structure of a slave response.34
Figure 12 − Structure of a data exchange request (top: standard address mode;
bottom: extended address mode) .34
Figure 13 − Structure of the slave response (Data_Exchange) .35
Figure 14 − Structure of the Write_Parameter request (top: standard addressing mode;
bottom: extended addressing mode) .35
Figure 15 − Structure of the slave response (Write_Parameter) .35
Figure 16 − Structure of the Address_Assignment request .36
Figure 17 − Structure of the slave response (Address_Assignment).36
Figure 18 − Structure of the Write_Extended_ID-Code_1 request .36
Figure 19 − Structure of the slave response (Write_Extended_ID-Code_1) .36
Figure 20 − Structure of the Reset_Slave request (top: standard addressing mode;
bottom: extended addressing mode) .37
Figure 21 − Structure of the slave response (Reset_Slave).37
Figure 22 − Structure of the Delete_Address request (top: standard addressing mode;
bottom: extended addressing mode) .37
Figure 23 − Structure of the slave response (Delete_Address).37
Figure 24 – Structure of the Read_I/O_Configuration request top: standard addressing
mode; bottom: extended addressing mode).38
Figure 25 – Structure of the slave response (Read_I/O_Configuration) .38
Figure 26 – Structure of Read_Identification_Code request (top: standard addressing
mode; bottom: extended addressing mode).39
Figure 27 – Structure of the slave response (Read_Identification_Code) .39
Figure 28 – Structure of Read_Extended_ID-Code_1/2 Request (top: standard
addressing mode; bottom: extended addressing mode).
Figure 29 – Structure of the slave response Read_Extended_ID-Code_1/2.40
Figure 30 − Structure of Read_Status request (top: standard addressing mode;
bottom: extended addressing mode) .41
Figure 31 − Structure of the slave response (Read_Status) .41
Figure 32 − Structure of R1 request (top: standard addressing mode; bottom:
extended addressing mode).41
Figure 33 − Structure of the slave response (R1) .41
Figure 34 – Structure of the Broadcast (Reset) request.42
Figure 35 – Definition of the I/O data bits in combined transaction type 1 .43
Figure 36 – Definition of the parameter bits in combined transaction type 1 .43
Figure 37 – Function sequence to Read ID, Read Diagnosis, Read Parameter in
combined transaction type 1 .

– 4 – 62026-2 © IEC:2008(E)
Figure 38 – Function sequence to Write Parameter in combined transaction type 1 .47
Figure 39 – Behaviour of the slave receiving a complete parameter string from the
master in combined transaction type 1.48
Figure 40 – Definition of the I/O data bits in combined transaction type 2 .49
Figure 41 – Typical combined transaction type 2 signals as viewed by an oscilloscope
(both data channels run idle) .50
Figure 42 – Typical combined transaction type 2 signals (the master transmits the byte
10101011 , the slave transmits 01110101 ):.51
Bin Bin
Figure 43 – Definition of the I/O data bits in combined transaction type 3 (4I/4O) .52
Figure 44 – Definition and state diagram of the slave for combined transaction type 3 .53
Figure 45 – Definition of the I/O data bits in combined transaction type 4 .55
Figure 46– AS-i standard cable for field installation .63
Figure 47 − AS-i cabinet cable .64
Figure 48 – Equivalent schematic of decoupling circuit .68
Figure 49 – Decoupling circuit using a transformer .68
Figure 50 – Typical timing diagram for bidirectional input/outputs (D1, . D3 = voltage
level at respective data port).
Figure 51 – Main state diagram of an AS-i slave .
...

IEC 62026-2 ®
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –
Partie 2: Interface capteur-actionneur (AS-i)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
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IEC 62026-2 ®
Edition 2.0 2008-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –
Partie 2: Interface capteur-actionneur (AS-i)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XH
CODE PRIX
ICS 29.130.20 ISBN 978-2-88910-609-7
– 2 – 62026-2 © IEC:2008
CONTENTS
FOREWORD.7
1 Scope and object.9
2 Normative references.9
3 Terms, definitions, symbols and abbreviations.11
4 Classification.18
4.1 Overview.18
4.2 Components and interfaces .19
5 Characteristics.21
5.1 Overview.21
5.2 Signal characteristics .21
5.3 Power and data distribution .23
5.4 AS-i topology and other components .25
5.5 Communication.27
5.6 AS-i single transactions.30
5.7 AS-i combined transactions .42
5.8 AS-i error detection .59
6 Product information .60
6.1 Instructions for installation, operation and maintenance .60
6.2 Profiles.60
6.3 Marking.61
7 Normal service, mounting and transport conditions.62
7.1 Normal service conditions .62
7.2 Conditions during transport and storage .62
7.3 Mounting.63
8 Constructional and performance requirements.63
8.1 AS-i transmission medium.63
8.2 AS-i power supply.66
8.3 AS-i repeater and other components .68
8.4 AS-i slave.69
8.5 AS-i master.85
8.6 Electromagnetic compatibility (EMC) .89
9 Tests.90
9.1 Kinds of tests.90
9.2 Test of transmission medium .91
9.3 Test of the AS-i power supply.92
9.4 Test of an AS-i repeater and other components.98
9.5 Test of an AS-i slave .106
9.6 Test of a AS-i master.120
Annex A (normative) Slave profiles .135
Annex B (normative) Master profiles .213

Figure 1 − AS-i components and interfaces.19
Figure 2 − Transmission coding .21
Figure 3 − Receiver requirements .23
Figure 4 − AS-i power supply .24

62026-2 © IEC:2008 – 3 –
Figure 5 − Equivalent schematic of symmetrization and decoupling circuit .25
Figure 6 − Model of the AS-i transmission medium.26
Figure 7 − Transactions .28
Figure 8 − Master and slave pause as viewed from master/slave point of view.28
Figure 9 − Representation of the master pause.29
Figure 10 − Structure of a master request .31
Figure 11 − Structure of a slave response.34
Figure 12 − Structure of a data exchange request (top: standard address mode;
bottom: extended address mode) .34
Figure 13 − Structure of the slave response (Data_Exchange) .35
Figure 14 − Structure of the Write_Parameter request (top: standard addressing mode;
bottom: extended addressing mode) .35
Figure 15 − Structure of the slave response (Write_Parameter) .35
Figure 16 − Structure of the Address_Assignment request .36
Figure 17 − Structure of the slave response (Address_Assignment).36
Figure 18 − Structure of the Write_Extended_ID-Code_1 request .36
Figure 19 − Structure of the slave response (Write_Extended_ID-Code_1) .36
Figure 20 − Structure of the Reset_Slave request (top: standard addressing mode;
bottom: extended addressing mode) .37
Figure 21 − Structure of the slave response (Reset_Slave).37
Figure 22 − Structure of the Delete_Address request (top: standard addressing mode;
bottom: extended addressing mode) .37
Figure 23 − Structure of the slave response (Delete_Address).37
Figure 24 – Structure of the Read_I/O_Configuration request (top: standard
addressing mode; bottom: extended addressing mode).38
Figure 25 – Structure of the slave response (Read_I/O_Configuration) .38
Figure 26 – Structure of Read_Identification_Code request (top: standard addressing
mode; bottom: extended addressing mode).39
Figure 27 – Structure of the slave response (Read_Identification_Code) .39
Figure 28 – Structure of Read_Extended_ID-Code_1/2 Request (top: standard
addressing mode; bottom: extended addressing mode).40
Figure 29 – Structure of the slave response Read_Extended_ID-Code_1/2.40
Figure 30 − Structure of Read_Status request (top: standard addressing mode;
bottom: extended addressing mode) .41
Figure 31 − Structure of the slave response (Read_Status) .41
Figure 32 − Structure of R1 request (top: standard addressing mode; bottom:
extended addressing mode).
...

IEC 62026-2 ®
Edition 2.1 2019-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –
Partie 2: Interface capteur-actionneur (AS-i)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
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International Standards for all electrical, electronic and related technologies.

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IEC 62026-2 ®
Edition 2.1 2019-07
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –

Part 2: Actuator sensor interface (AS-i)

Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –

Partie 2: Interface capteur-actionneur (AS-i)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-7176-6

IEC 62026-2 ®
Edition 2.1 2019-07
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 2: Actuator sensor interface (AS-i)

Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –
Partie 2: Interface capteur-actionneur (AS-i)

– 2 – IEC 62026-2:2008+AMD1:2019 CSV
 IEC 2019
CONTENTS
FOREWORD . 7
1 Scope and object . 9
2 Normative references . 9
3 Terms, definitions, symbols and abbreviations . 11
4 Classification . 18
5 Characteristics . 21
6 Product information . 60
7 Normal service, mounting and transport conditions . 62
8 Constructional and performance requirements . 63
9 Tests . 90
Annex A (normative) Slave profiles . 135
Annex B (normative) Master profiles . 213

Figure 1 − AS-i components and interfaces . 19
Figure 2 − Transmission coding . 21
Figure 3 − Receiver requirements . 23
Figure 4 − AS-i power supply . 24
Figure 5 − Equivalent schematic of symmetrization and decoupling circuit . 25
Figure 6 − Model of the AS-i transmission medium . 26
Figure 7 − Transactions . 28
Figure 8 − Master and slave pause as viewed from master/slave point of view . 28
Figure 9 − Representation of the master pause . 29
Figure 10 − Structure of a master request . 31
Figure 11 − Structure of a slave response . 34
Figure 12 − Structure of a data exchange request (top: standard address mode;
bottom: extended address mode) . 34
Figure 13 − Structure of the slave response (Data_Exchange) . 35
Figure 14 − Structure of the Write_Parameter request (top: standard addressing mode;
bottom: extended addressing mode) . 35
Figure 15 − Structure of the slave response (Write_Parameter) . 35
Figure 16 − Structure of the Address_Assignment request . 36
Figure 17 − Structure of the slave response (Address_Assignment) . 36
Figure 18 − Structure of the Write_Extended_ID-Code_1 request . 36
Figure 19 − Structure of the slave response (Write_Extended_ID-Code_1) . 36
Figure 20 − Structure of the Reset_Slave request (top: standard addressing mode;
bottom: extended addressing mode) . 37
Figure 21 − Structure of the slave response (Reset_Slave) . 37
Figure 22 − Structure of the Delete_Address request (top: standard addressing mode;
bottom: extended addressing mode) . 37
Figure 23 − Structure of the slave response (Delete_Address) . 37
Figure 24 – Structure of the Read_I/O_Configuration request (top: standard
addressing mode; bottom: extended addressing mode) . 38

 IEC 2019
Figure 25 – Structure of the slave response (Read_I/O_Configuration) . 38
Figure 26 – Structure of Read_Identification_Code request (top: standard addressing
mode; bottom: extended addressing mode) . 39
Figure 27 – Structure of the slave response (Read_Identification_Code) . 39
Figure 28 – Structure of Read_Extended_ID-Code_1/2 Request (top: standard

addressing mode; bottom: extended addressing mode) . 40
Figure 29 – Structure of the slave response Read_Extended_ID-Code_1/2 . 40
Figure 30 − Structure of Read_Status request (top: standard addressing mode;
bottom: extended addressing mode) . 41
Figure 31 − Structure of the slave response (Read_Status) . 41
Figure 32 − Structure of R1 request (top: standard addressing mode; bottom:
extended addressing mode) . 41
Figure 33 − Structure of the slave response (R1) . 41
Figure 34 – Structure of the Broadcast (Reset) request . 42
Figure 35 – Definition of the I/O data bits in combined transaction type 1 . 43
Figure 36 – Definition of the parameter bits in combined transaction type 1 . 43
Figure 37 – Function sequence to Read ID, Read Diagnosis, Read Parameter in

combined transaction type 1 . 46
Figure 38 – Function sequence to Write Parameter in combined transaction type 1 . 47
Figure 39 – Behaviour of the slave receiving a complete parameter string from the
master in combined transaction type 1 . 48
Figure 40 – Definition of the I/O data bits in combined transaction type 2 . 49
Figure 41 – Typical combined transaction type 2 signals as viewed by an oscilloscope
(both data channels run idle) . 50
Figure 42 – Typical combined transaction type 2 signals (the master transmits the byte

10101011 , the slave transmits 01110101 ): . 51
Bin Bin
Figure 43 – Definition of the I/O data bits in combined transaction type 3 (4I/4O) . 52
Figure 44 – Definition and state diagram of the slave for combined transaction type 3 . 53
Figure 45 – Definition of the I/O data bits in combined transaction type 4 . 55
Figure 46 – AS-i standard cable for field installation . 63
Figure 47 − AS-i cabinet cable .
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