Programmable controllers - Part 9: Single-drop digital communication interface for small sensors and actuators (SDCI)

IEC 61131-9:2022 specifies a single-drop digital communication interface technology for small sensors and actuators SDCI (commonly known as IO-Link™ ), which extends the traditional digital input and digital output interfaces as defined in IEC 61131-2 towards a point-to-point communication link for the exchange of complex data in both directions. This techno¬logy also enables the transfer of parameters to Devices and the delivery of identification and diagnostic information from the Devices to the automation system.
This technology is mainly intended for use with simple sensors and actuators in factory automation, which include small and cost-effective microcontrollers.
This document specifies the SDCI communication services and protocol (physical layer, data link layer and application layer in accordance with the ISO/OSI reference model) for both SDCI Masters and Devices.
This document also includes EMC test requirements.
This document does not cover communication interfaces or systems incorporating multiple point or multiple drop linkages, or integration of SDCI into higher level systems such as fieldbuses.

Automates programmables - Partie 9: Interface de communication numérique point à point pour les petits capteurs et actionneurs (SDCI)

L'IEC 61131-9:2022 spécifie une technologie d'interface de communication numérique point à point pour petits capteurs et actionneurs – SDCI – (généralement connue sous l'appellation IO-Link™[1]). Elle permet d'étendre les interfaces classiques d'entrées et de sorties numériques (telles que définies dans l'IEC 61131-2) en une liaison de communication point à point pour l'échange de données complexe dans les deux sens. Cette technologie permet également de transférer des paramètres aux Dispositifs et de fournir au système d'automatisation des informations de diagnostic et d'identification depuis les Dispositifs.
Cette technologie est principalement destinée à l’utilisation en automatisation d'usine avec de simples capteurs et actionneurs intégrant de petits microcontrôleurs économiques.
Le présent document spécifie les services et le protocole de communication SDCI (couche physique, couche de liaison de données et couche Application conformément au modèle de référence ISO/OSI) pour les Maîtres et Dispositifs SDCI.
Le présent document inclut également des exigences d'essai CEM.
Le présent document ne couvre pas les interfaces ou systèmes de communication comportant des connexions multipoints ou à liaisons multiples, ou encore l'intégration de SDCI dans des systèmes de niveau supérieur tels que les bus de terrain.
[1] IO-LinkTM est une marque commerciale de "IO-Link Community". Cette information est fournie pour la commodité des utilisateurs du présent document et ne signifie nullement que l'IEC recommande l'emploi exclusif de la marque ou de l’un quelconque de ses produits. La conformité au présent document ne nécessite pas l’utilisation des logos déposés pour IO-LinkTM. L’utilisation des logos déposés pour IO-LinkTM nécessite l’autorisation du "IO-Link Community".

General Information

Status
Published
Publication Date
29-May-2022
Current Stage
PPUB - Publication issued
Completion Date
30-May-2022
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IEC 61131-9
Edition 2.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Programmable controllers –
Part 9: Single-drop digital communication interface for small sensors and
actuators (SDCI)
Automates programmables –
Partie 9: Interface de communication numérique point à point pour petits
capteurs et actionneurs (SDCI)
IEC 61131-9:2022-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61131-9
Edition 2.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Programmable controllers –
Part 9: Single-drop digital communication interface for small sensors and
actuators (SDCI)
Automates programmables –
Partie 9: Interface de communication numérique point à point pour petits
capteurs et actionneurs (SDCI)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-1261-5

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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61131-9:2022 © IEC 2022
CONTENTS

FOREWORD ......................................................................................................................... 20

INTRODUCTION ................................................................................................................... 22

0.1 General ................................................................................................................. 22

0.2 Patent declaration ................................................................................................. 23

1 Scope ............................................................................................................................ 24

2 Normative references .................................................................................................... 24

3 Terms, definitions, symbols, abbreviated terms, and conventions .................................. 25

3.1 Terms and definitions ............................................................................................ 25

3.2 Symbols and abbreviated terms ............................................................................ 29

3.3 Conventions .......................................................................................................... 31

3.3.1 General ......................................................................................................... 31

3.3.2 Service parameters........................................................................................ 32

3.3.3 Service procedures ........................................................................................ 32

3.3.4 Service attributes ........................................................................................... 32

3.3.5 Figures .......................................................................................................... 33

3.3.6 Tables ........................................................................................................... 33

3.3.7 Transmission octet order ............................................................................... 33

3.3.8 Behavioral descriptions .................................................................................. 33

4 Overview of SDCI (IO-Link ) ........................................................................................ 35

4.1 Purpose of technology .......................................................................................... 35

4.2 Positioning within the automation hierarchy .......................................................... 35

4.3 Wiring, connectors and power ............................................................................... 36

4.4 Communication features of SDCI .......................................................................... 36

4.5 Role of a Master ................................................................................................... 39

4.6 SDCI configuration ................................................................................................ 40

4.7 Mapping to fieldbuses and/or other upper-level systems ....................................... 40

4.8 Standard structure ................................................................................................ 40

5 Physical Layer (PL) ....................................................................................................... 41

5.1 General ................................................................................................................. 41

5.1.1 Basics ........................................................................................................... 41

5.1.2 Topology ....................................................................................................... 41

5.2 Physical layer services.......................................................................................... 42

5.2.1 Overview ....................................................................................................... 42

5.2.2 PL services .................................................................................................... 43

5.3 Transmitter/Receiver ............................................................................................. 45

5.3.1 Description method ........................................................................................ 45

5.3.2 Electrical requirements .................................................................................. 45

5.3.3 Timing requirements ...................................................................................... 50

5.4 Power supply ........................................................................................................ 54

5.4.1 Power supply options ..................................................................................... 54

5.4.2 Port Class B .................................................................................................. 55

5.4.3 Power-on requirements .................................................................................. 56

5.5 Medium ................................................................................................................. 56

5.5.1 Connectors .................................................................................................... 56

5.5.2 Cable ............................................................................................................. 57

6 Standard Input and Output (SIO) ................................................................................... 58

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IEC 61131-9:2022 © IEC 2022 – 3 –

7 Data link layer (DL) ........................................................................................................ 59

7.1 General ................................................................................................................. 59

7.2 Data link layer services ......................................................................................... 60

7.2.1 DL-B services ................................................................................................ 60

7.2.2 DL-A services ................................................................................................ 71

7.3 Data link layer protocol ......................................................................................... 75

7.3.1 Overview ....................................................................................................... 75

7.3.2 DL-mode handler ........................................................................................... 76

7.3.3 Message handler ........................................................................................... 84

7.3.4 Process Data handler .................................................................................... 92

7.3.5 On-request Data handler ............................................................................... 95

7.3.6 ISDU handler ................................................................................................. 98

7.3.7 Command handler ....................................................................................... 102

7.3.8 Event handler .............................................................................................. 105

8 Application layer (AL) .................................................................................................. 108

8.1 General ............................................................................................................... 108

8.2 Application layer services ................................................................................... 109

8.2.1 AL services within Master and Device .......................................................... 109

8.2.2 AL Services ................................................................................................. 110

8.3 Application layer protocol .................................................................................... 118

8.3.1 Overview ..................................................................................................... 118

8.3.2 On-request Data transfer ............................................................................. 118

8.3.3 Event processing ......................................................................................... 124

8.3.4 Process Data cycles .................................................................................... 127

9 System Management (SM) ........................................................................................... 128

9.1 General ............................................................................................................... 128

9.2 System Management of the Master ..................................................................... 128

9.2.1 Overview ..................................................................................................... 128

9.2.2 SM Master services ..................................................................................... 130

9.2.3 SM Master protocol ...................................................................................... 135

9.3 System Management of the Device ..................................................................... 143

9.3.1 Overview ..................................................................................................... 143

9.3.2 SM Device services ..................................................................................... 145

9.3.3 SM Device protocol...................................................................................... 151

10 Device ......................................................................................................................... 158

10.1 Overview............................................................................................................. 158

10.2 Process Data Exchange (PDE) ........................................................................... 159

10.3 Parameter Manager (PM) .................................................................................... 159

10.3.1 General ....................................................................................................... 159

10.3.2 Parameter Manager state machine .............................................................. 159

10.3.3 Dynamic parameter ..................................................................................... 162

10.3.4 Single parameter ......................................................................................... 162

10.3.5 Block Parameter .......................................................................................... 163

10.3.6 Concurrent parameterization access ............................................................ 166

10.3.7 Command handling ...................................................................................... 166

10.4 Data Storage (DS) .............................................................................................. 167

10.4.1 General ....................................................................................................... 167

10.4.2 Data Storage state machine ......................................................................... 167

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– 4 – IEC 61131-9:2022 © IEC 2022

10.4.3 DS configuration .......................................................................................... 169

10.4.4 DS memory space ....................................................................................... 169

10.4.5 DS Index_List .............................................................................................. 169

10.4.6 DS parameter availability ............................................................................. 170

10.4.7 DS without ISDU .......................................................................................... 170

10.4.8 DS parameter change indication .................................................................. 170

10.5 Event Dispatcher (ED) ........................................................................................ 170

10.6 Device features ................................................................................................... 170

10.6.1 General ....................................................................................................... 170

10.6.2 Device backward compatibility ..................................................................... 170

10.6.3 Protocol revision compatibility ..................................................................... 171

10.6.4 Visual SDCI indication ................................................................................. 171

10.6.5 Parameter access locking ............................................................................ 171

10.6.6 Data Storage locking ................................................................................... 171

10.6.7 Locking of local parameter entries ............................................................... 171

10.6.8 Locking of local user interface ..................................................................... 171

10.6.9 Offset time ................................................................................................... 171

10.6.10 Data Storage concept .................................................................................. 172

10.6.11 Block Parameter .......................................................................................... 172

10.7 Device reset options ........................................................................................... 172

10.7.1 Overview ..................................................................................................... 172

10.7.2 Device reset ................................................................................................ 173

10.7.3 Application reset .......................................................................................... 173

10.7.4 Restore factory settings ............................................................................... 174

10.7.5 Back-to-box ................................................................................................. 174

10.8 Device design rules and constraints .................................................................... 174

10.8.1 General ....................................................................................................... 174

10.8.2 Process Data ............................................................................................... 174

10.8.3 Communication loss .................................................................................... 175

10.8.4 Direct Parameter ......................................................................................... 175

10.8.5 ISDU communication channel ...................................................................... 175

10.8.6 DeviceID rules related to Device variants .................................................... 175

10.8.7 Protocol constants ....................................................................................... 176

10.9 IO Device description (IODD) .............................................................................. 176

10.10 Device diagnosis ................................................................................................. 176

10.10.1 Concepts ..................................................................................................... 176

10.10.2 Events ......................................................................................................... 177

10.10.3 Visual indicators .......................................................................................... 178

10.11 Device connectivity ............................................................................................. 179

11 Master ......................................................................................................................... 179

11.1 Overview............................................................................................................. 179

11.1.1 Positioning of Master and Gateway Applications .......................................... 179

11.1.2 Structure, applications, and services of a Master ......................................... 180

11.1.3 Object view of a Master and its Ports ........................................................... 181

11.2 Services of the Standardized Master Interface (SMI) ........................................... 182

11.2.1 Overview ..................................................................................................... 182

11.2.2 Structure of SMI service arguments ............................................................. 183

11.2.3 Concurrency and prioritization of SMI services ............................................ 184

11.2.4 SMI_MasterIdentification ............................................................................. 185

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IEC 61131-9:2022 © IEC 2022 – 5 –

11.2.5 SMI_PortConfiguration................................................................................. 186

11.2.6 SMI_ReadbackPortConfiguration ................................................................. 187

11.2.7 SMI_PortStatus ........................................................................................... 189

11.2.8 SMI_DSToParServ ...................................................................................... 190

11.2.9 SMI_ParServToDS ...................................................................................... 191

11.2.10 SMI_DeviceWrite ......................................................................................... 193

11.2.11 SMI_DeviceRead ......................................................................................... 194

11.2.12 SMI_ParamWriteBatch ................................................................................. 195

11.2.13 SMI_ParamReadBatch ................................................................................. 197

11.2.14 SMI_PortPowerOffOn .................................................................................. 198

11.2.15 SMI_DeviceEvent ........................................................................................ 200

11.2.16 SMI_PortEvent ............................................................................................ 201

11.2.17 SMI_PDIn .................................................................................................... 201

11.2.18 SMI_PDOut ................................................................................................. 203

11.2.19 SMI_PDInOut .............................................................................................. 204

11.2.20 SMI_PDInIQ ................................................................................................ 205

11.2.21 SMI_PDOutIQ .............................................................................................. 207

11.2.22 SMI_PDReadbackOutIQ .............................................................................. 208

11.3 Configuration Manager (CM) ............................................................................... 209

11.3.1 Coordination of Master applications ............................................................. 209

11.3.2 State machine of the Configuration Manager ............................................... 212

11.4 Data Storage (DS) .............................................................................................. 217

11.4.1 Overview ..................................................................................................... 217

11.4.2 DS data object ............................................................................................. 217

11.4.3 Backup and Restore .................................................................................... 217

11.4.4 DS state machine ........................................................................................ 217

11.4.5 Parameter selection for Data Storage .......................................................... 224

11.5 On-request Data exchange (ODE) ....................................................................... 224

11.6 Diagnosis Unit (DU) ............................................................................................ 225

11.6.1 General ....................................................................................................... 225

11.6.2 Device specific Events ................................................................................. 226

11.6.3 Port specific Events ..................................................................................... 226

11.6.4 Dynamic diagnosis status ............................................................................ 227

11.6.5 Best practice recommendations ................................................................... 227

11.7 PD Exchange (PDE)............................................................................................ 228

11.7.1 General ....................................................................................................... 228

11.7.2 Process Data input mapping ........................................................................ 228

11.7.3 Process Data output mapping ...................................................................... 229

11.7.4 Process Data invalid/valid qualifier status .................................................... 230

12 Holistic view on Data Storage ...................................................................................... 231

12.1 User point of view ............................................................................................... 231

12.2 Operations and preconditions ............................................................................. 232

12.2.1 Purpose and objectives ............................................................................... 232

12.2.2 Preconditions for the activation of the Data Storage mechanism .................. 232

12.2.3 Preconditions for the types of Devices to be replaced .................................. 232

12.2.4 Preconditions for the parameter sets ........................................................... 232

12.3 Commissioning ................................................................................................... 233

12.3.1 On-line commissioning................................................................................. 233

12.3.2 Off-site commissioning ................................................................................ 233

---------------------- Page: 7 ----------------------
– 6 – IEC 61131-9:2022 © IEC 2022

12.4 Backup Levels .................................................................................................... 234

12.4.1 Purpose ....................................................................................................... 234

12.4.2 Overview ..................................................................................................... 234

12.4.3 Commissioning ("Disable")........................................................................... 235

12.4.4 Production ("Backup/Restore") ................................
...

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