Industrial communication networks - Profiles - Part 3-13: Functional safety fieldbuses - Additional specifications for CPF 13

IEC 61784-3-13:2021 specifies a safety communication layer (services and protocol) based on CPF 13 of IEC 61784 2 and IEC 61158 Type 13. It identifies the principles for functional safety communications defined in IEC 61784 3 that are relevant for this safety communication layer. This safety communication layer is intended for implementation in safety devices only.
NOTE 1 It does not cover electrical safety and intrinsic safety aspects. Electrical safety relates to hazards such as electrical shock. Intrinsic safety relates to hazards associated with potentially explosive atmospheres. This document defines mechanisms for the transmission of safety-relevant messages among participants within a distributed network using fieldbus technology in accordance with the requirements of IEC 61508 (all parts) for functional safety. These mechanisms may be used in various industrial applications such as process control, manufacturing automation and machinery. This document provides guidelines for both developers and assessors of compliant devices and systems.

Réseaux de communication industriels - Profils - Partie 3-13: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour CPF 13

L'IEC 61784-3-13:2021 spécifie une couche de communication de sécurité (services et protocole) qui repose sur la CPF 13 de l'IEC 61784 2 et le type 13 de l'IEC 61158. Elle identifie les principes applicables aux communications de sécurité fonctionnelle définies dans l'IEC 61784 3, qui correspondent à cette couche de communication de sécurité. Cette couche de communication de sécurité est destinée à être mise en œuvre uniquement sur les appareils de sécurité.
NOTE 1 Elle ne couvre pas les aspects relatifs à la sécurité électrique et à la sécurité intrinsèque. La sécurité électrique concerne les dangers tels que les chocs électriques. La sécurité intrinsèque concerne les dangers associés aux atmosphères explosibles. Le présent document définit les mécanismes de transmission des messages relatifs à la sécurité entre les participants d'un réseau réparti, en utilisant la technologie de bus de terrain conformément aux exigences de la série IEC 61508 (toutes les parties) concernant la sécurité fonctionnelle. Ces mécanismes peuvent être utilisés dans différentes applications industrielles, par exemple la commande de processus, l'usinage automatique et les machines. Le présent document fournit des lignes directrices aux développeurs, ainsi qu'aux évaluateurs d'appareils et de systèmes conformes.

General Information

Status
Published
Publication Date
18-May-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
19-May-2021
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IEC 61784-3-13
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-13: Functional safety fieldbuses – Additional specifications for CPF 13
Réseaux de communication industriels – Profils –
Partie 3-13: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 13
IEC 61784-3-13:2021-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61784-3-13
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-13: Functional safety fieldbuses – Additional specifications for CPF 13
Réseaux de communication industriels – Profils –
Partie 3-13: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 13
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
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INTERNATIONALE
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---------------------- Page: 3 ----------------------
– 2 – IEC 61784-3-13:2021  IEC 2021
CONTENTS

FOREWORD ......................................................................................................................... 14

0 Introduction ................................................................................................................... 16

0.1 General ................................................................................................................. 16

0.2 Patent declaration ................................................................................................. 18

1 Scope ............................................................................................................................ 19

2 Normative references .................................................................................................... 19

3 Terms, definitions, symbols, abbreviated terms and conventions ................................... 20

3.1 Terms and definitions ............................................................................................ 20

3.1.1 Common terms and definitions ....................................................................... 20

3.1.2 CPF 13: Additional terms and definitions ....................................................... 25

3.2 Symbols and abbreviated terms ............................................................................ 27

3.2.1 Common symbols and abbreviated terms ....................................................... 27

3.2.2 CPF 13: Additional symbols and abbreviated terms ....................................... 27

3.3 Conventions .......................................................................................................... 28

3.3.1 Hexadecimal values ....................................................................................... 28

3.3.2 Binary values ................................................................................................. 28

3.3.3 Wildcard digits ............................................................................................... 28

3.3.4 Diagrams ....................................................................................................... 29

4 Overview of FSCP 13/1 (openSAFETY™) ...................................................................... 29

4.1 Functional Safety Communication Profile 13/1 ...................................................... 29

4.2 Technical overview ............................................................................................... 29

5 General ......................................................................................................................... 30

5.1 External documents providing specifications for the profile ................................... 30

5.2 Safety functional requirements .............................................................................. 30

5.3 Safety measures ................................................................................................... 31

5.4 Safety communication layer structure .................................................................... 32

5.5 Relationships with FAL (and DLL, PhL) ................................................................. 34

5.5.1 General ......................................................................................................... 34

5.5.2 Data types ..................................................................................................... 34

6 Safety communication layer services ............................................................................. 34

6.1 Modelling .............................................................................................................. 34

6.1.1 Reference model ........................................................................................... 34

6.1.2 Communication model ................................................................................... 35

6.1.3 Device roles and topology .............................................................................. 36

6.2 Life cycle model .................................................................................................... 40

6.2.1 General ......................................................................................................... 40

6.2.2 Concept, planning and implementation .......................................................... 40

6.2.3 Commissioning .............................................................................................. 41

6.2.4 Operation terms ............................................................................................. 43

6.2.5 Maintenance terms ........................................................................................ 44

6.3 Non safety communication layer ........................................................................... 44

6.3.1 General ......................................................................................................... 44

6.3.2 Requirements for data transport .................................................................... 44

6.3.3 Domain protection and separation ................................................................. 48

7 Safety communication layer protocol ............................................................................. 48

---------------------- Page: 4 ----------------------
IEC 61784-3-13:2021  IEC 2021 – 3 –

7.1 Safety PDU format ................................................................................................ 48

7.1.1 Structure of Safety PDUs ............................................................................... 48

7.1.2 Address field (ADR) ....................................................................................... 53

7.1.3 PDU identification field (ID) ........................................................................... 53

7.1.4 Length field (LE) ............................................................................................ 55

7.1.5 Consecutive Time field (CT) .......................................................................... 55

7.1.6 Payload data field (DB0 to DBn) .................................................................... 55

7.1.7 Cyclic Redundancy Check field (CRC-8 / CRC-16)......................................... 55

7.1.8 Time Request Address field (TADR) .............................................................. 56

7.1.9 Time Request Distinctive Number field (TR) .................................................. 56

7.1.10 UDID of SCM coding (UDID of SCM) ............................................................. 56

7.2 Safety Process Data Object (SPDO) ..................................................................... 57

7.2.1 General ......................................................................................................... 57

7.2.2 SPDO telegram types .................................................................................... 57

7.2.3 Data Only telegram ........................................................................................ 57

7.2.4 Data with Time Request telegram .................................................................. 58

7.2.5 Data with Time Response telegram ............................................................... 59

7.3 Safety Service Data Object (SSDO) ...................................................................... 60

7.3.1 General ......................................................................................................... 60

7.3.2 SSDO telegram types .................................................................................... 60

7.3.3 SSDO services and protocols ........................................................................ 61

7.3.4 SSDO Download Initiate ................................................................................ 62

7.3.5 SSDO Download Segment ............................................................................. 64

7.3.6 SSDO Download Initiate with Preload ............................................................ 64

7.3.7 SSDO Download Segment with Preload ......................................................... 66

7.3.8 SSDO Upload Initiate ..................................................................................... 67

7.3.9 SSDO Upload Segment ................................................................................. 68

7.3.10 SSDO Upload Initiate with Preload ................................................................ 69

7.3.11 SSDO Upload Segment with Preload ............................................................. 70

7.3.12 SSDO Abort ................................................................................................... 71

7.3.13 SSDO Preload ............................................................................................... 73

7.4 Safety Network Management (SNMT) ................................................................... 74

7.4.1 General ......................................................................................................... 74

7.4.2 SNMT telegram types .................................................................................... 74

7.4.3 SNMT services and protocols ........................................................................ 75

7.5 Safety Object dictionary (SOD) ............................................................................. 89

7.5.1 General ......................................................................................................... 89

7.5.2 Object dictionary entry definition .................................................................... 89

7.5.3 Data type entry specification .......................................................................... 94

7.5.4 Object description .......................................................................................... 96

7.6 Safety related PDO mapping ............................................................................... 141

7.6.1 General ....................................................................................................... 141

7.6.2 Transmit SPDOs .......................................................................................... 142

7.6.3 Receive SPDOs ........................................................................................... 142

7.6.4 SPDO mapping parameter ........................................................................... 142

7.6.5 SPDO mapping example .............................................................................. 143

7.6.6 SDPO Feature Set ....................................................................................... 145

7.6.7 SPDO error handling ................................................................................... 146

7.7 State and sequence diagrams ............................................................................. 146

---------------------- Page: 5 ----------------------
– 4 – IEC 61784-3-13:2021  IEC 2021

7.7.1 Safety Process Data Object (SPDO) ............................................................ 146

7.7.2 Time synchronization and validation ............................................................ 150

7.7.3 Safety Service Data Object (SSDO) ............................................................. 160

7.7.4 SOD access ................................................................................................. 162

7.7.5 Safety Network Management Object (SNMT) ............................................... 171

7.7.6 SN power up ................................................................................................ 173

7.7.7 SN power down ........................................................................................... 180

7.7.8 SN recovery after Restart / Error ................................................................. 180

7.7.9 SCM power up ............................................................................................. 180

7.7.10 Address verification ..................................................................................... 183

7.7.11 Commissioning mode................................................................................... 185

7.7.12 Handle single UDID mismatch ..................................................................... 185

7.7.13 Activate SN ................................................................................................. 189

7.7.14 Device exchange ......................................................................................... 190

8 Safety communication layer management .................................................................... 190

8.1 General ............................................................................................................... 190

8.2 Configuration of a Safety Domain ........................................................................ 191

8.3 Parameter check mechanism .............................................................................. 191

9 System requirements ................................................................................................... 191

9.1 Indicators and switches ....................................................................................... 191

9.2 Installation guidelines ......................................................................................... 192

9.3 Safety function response time ............................................................................. 192

9.4 Duration of demands ........................................................................................... 193

9.5 Constraints for calculation of system characteristics ........................................... 193

9.5.1 General ....................................................................................................... 193

9.5.2 Number of sinks limit ................................................................................... 193

9.5.3 Message rate limit ....................................................................................... 193

9.5.4 Message payload limit ................................................................................. 193

9.5.5 Bit error rate considerations ......................................................................... 194

9.5.6 Residual error rate ....................................................................................... 194

9.6 Maintenance ....................................................................................................... 195

9.6.1 Diagnostic information ................................................................................. 195

9.6.2 Replacement of safety related devices ......................................................... 195

9.6.3 Modification ................................................................................................. 196

9.6.4 Machine part changing................................................................................. 196

9.6.5 Firmware update of safety related nodes ..................................................... 196

9.6.6 Machine check due to service interval ......................................................... 196

9.7 Safety manual ..................................................................................................... 196

10 Assessment ................................................................................................................. 196

10.1 General ............................................................................................................... 196

10.2 CP 13/1 assessment ........................................................................................... 197

10.3 FSCP 13/1 conformance test .............................................................................. 197

10.4 Approval of functional safety by competent assessment body ............................. 197

Annex A (informative) Additional information for functional safety communication

profiles of CPF 13 ............................................................................................................... 198

A.1 Hash function calculation .................................................................................... 198

A.2 Void .................................................................................................................... 201

Annex B (informative) Information for assessment of the functional safety

communication profiles of CPF 13 ....................................................................................... 202

---------------------- Page: 6 ----------------------
IEC 61784-3-13:2021  IEC 2021 – 5 –

Bibliography ........................................................................................................................ 203

Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) ........................... 16

Figure 2 – Relationships of IEC 61784-3 with other standards (process) ............................... 17

Figure 3 – Producer consumer example ................................................................................ 30

Figure 4 – Client server example .......................................................................................... 30

Figure 5 – Communication layer structure ............................................................................. 33

Figure 6 – Safety communication channel ............................................................................. 34

Figure 7 – Characteristic producer / consumer communication .............................................. 35

Figure 8 – Extended producer / consumer communication .................................................... 36

Figure 9 – Client Server communication ................................................................................ 36

Figure 10 – Topology overview ............................................................................................. 37

Figure 11 – Safety Domain protection (example) ................................................................... 38

Figure 12 – Safety Domain separation (example) .................................................................. 39

Figure 13 – Data flow example .............................................................................................. 43

Figure 14 – Communication model ........................................................................................ 45

Figure 15 – SPDO transport .................................................................................................. 46

Figure 16 – SSDO transport .................................................................................................. 47

Figure 17 – Diagnostic data representation ........................................................................... 48

Figure 18 – Safety PDUs inside a CP 13/1 PDU .................................................................... 49

Figure 19 – Basic Safety PDU for n = 0 – 8 octet payload data ............................................. 49

Figure 20 – Basic Safety PDU from 9 octet payload data ...................................................... 49

Figure 21 – Slim Safety PDU for n = 0 – 8 octet payload data ............................................... 50

Figure 22 – Slim Safety PDU from 9 octet payload data ........................................................ 51

Figure 23 – Safety PDU with 40 bit counter for n = 0 – 8 octet payload data ......................... 52

Figure 24 – Safety PDU with 40 bit counter from 9 octet payload data .................................. 52

Figure 25 – SPDO_Data_Only telegram ................................................................................ 58

Figure 26 – SPDO_Data_with_Time_Request telegram ........................................................ 58

Figure 27 – SPDO_Data_with_Time_Response telegram ...................................................... 59

Figure 28 – SSDO download protocols .................................................................................. 62

Figure 29 – SSDO upload protocols ...................................................................................... 62

Figure 30 – SSDO Download Initiate protocol ....................................................................... 63

Figure 31 – SSDO Download Segment protocol .................................................................... 64

Figure 32 – SSDO Download Initiate protocol with Preload ................................................... 65

Figure 33 – SSDO Download Segment protocol with Preload ................................................ 66

Figure 34 – SSDO Upload Initiate protocol ............................................................................ 67

Figure 35 – SSDO Upload Segment protocol ........................................................................ 68

Figure 36 – SSDO Upload Initiate protocol with Preload ....................................................... 69

Figure 37 – SSDO Upload Segment protocol with Preload .................................................... 71

Figure 38 – SSDO Abort protocol .......................................................................................... 72

Figure 39 – UDID Request / Response protocol .................................................................... 75

Figure 40 – SADR Assignment protocol ................................................................................ 76

Figure 41 – Reset Node Guarding Time protocol ................................................................... 77

---------------------- Page: 7 ----------------------
– 6 – IEC 61784-3-13:2021  IEC 2021

Figure 42 – SN set to Pre-Operational protocol ..................................................................... 79

Figure 43 – SN set to Operational protocol ........................................................................... 80

Figure 44 – SN Acknowledge protocol................................................................................... 82

Figure 45 – SN set to stop protocol ....................................................................................... 83

Figure 46 – SCM set to Operational protocol ......................................................................... 83

Figure 47 – Node Guarding protocol ..................................................................................... 84

Figure 48 – Additional SADR Assignment protocol ................................................................ 85

Figure 49 – UDID of SCM Assignment protocol ..................................................................... 87

Figure 50 – Init CT value assignment protocol ...................................................................... 88

Figure 51 – SPDO mapping example .................................................................................. 143

Figure 52 – State diagram TxSPDO .................................................................................... 146

Figure 53 – SPDO communication producer ........................................................................ 147

Figure 54 – State diagram RxSPDO .................................................................................... 148

Figure 55 – SPDO communication consumer ...................................................................... 148

Figure 56 – State diagram
...

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