Industrial communication networks - Profiles - Part 3-8: Functional safety fieldbuses - Additional specifications for CPF8

IEC 61784-3-8:2021 specifies a safety communication layer (services and protocol) based on CPF 8 of IEC 61784 1, IEC 61784-2 and IEC 61158 Type 18 and Type 23. 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 3-8: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour CPF 8

L'IEC 61784-3-8:2021 spécifie une couche de communication de sécurité (services et protocole) qui repose sur la CPF 8 de l'IEC 61784 1, de l'IEC 61784-2 et de l'IEC 61158 Type 18 et Type 23. 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 61784-3-8
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-8: Functional safety fieldbuses – Additional specifications for CPF 8
Réseaux de communication industriels – Profils –
Partie 3-8: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 8
IEC 61784-3-8:2021-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61784-3-8
Edition 3.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –
Part 3-8: Functional safety fieldbuses – Additional specifications for CPF 8
Réseaux de communication industriels – Profils –
Partie 3-8: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 8
INTERNATIONAL
ELECTROTECHNICAL
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---------------------- Page: 3 ----------------------
– 2 – IEC 61784-3-8:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 7

0 Introduction ..................................................................................................................... 9

0.1 General ................................................................................................................... 9

0.2 Patent declaration ................................................................................................. 11

1 Scope ............................................................................................................................ 12

2 Normative references .................................................................................................... 12

3 Terms, definitions, symbols, abbreviated terms and conventions ................................... 13

3.1 Terms and definitions ............................................................................................ 13

3.1.1 Common terms and definitions ....................................................................... 14

3.1.2 CPF 8: Additional terms and definitions ......................................................... 20

3.2 Symbols and abbreviated terms ............................................................................ 21

3.2.1 Common symbols and abbreviated terms ....................................................... 21

3.2.2 CPF 8: Additional symbols and abbreviated terms ......................................... 22

3.3 Conventions .......................................................................................................... 22

4 Overview ....................................................................................................................... 22

5 General ......................................................................................................................... 22

6 Safety communication layer services ............................................................................. 22

7 Safety communication layer protocol ............................................................................. 23

8 Safety communication layer management ...................................................................... 23

9 System requirements ..................................................................................................... 23

10 Assessment ................................................................................................................... 23

11 FSCP 8/1 ....................................................................................................................... 23

11.1 Scope – FSCP 8/1 ................................................................................................ 23

11.2 Normative references – FSCP 8/1 ......................................................................... 23

11.3 Terms, definitions, symbols, abbreviated terms and conventions – FSCP 8/1 ........ 23

11.4 Overview of FSCP 8/1 (CC-Link Safety™) ............................................................. 23

11.5 General – FSCP 8/1 .............................................................................................. 24

11.5.1 External documents providing specifications for the profile ............................ 24

11.5.2 Safety functional requirements ...................................................................... 24

11.5.3 Safety measures ............................................................................................ 24

11.5.4 Safety communication layer structure ............................................................ 26

11.5.5 Relationships with FAL (and DLL, PhL) .......................................................... 27

11.6 Safety communication layer services for FSCP 8/1 ............................................... 27

11.6.1 General ......................................................................................................... 27

11.6.2 SASEs ........................................................................................................... 27

11.6.3 SARs ............................................................................................................. 28

11.6.4 Process data SAR ASEs ................................................................................ 29

11.7 Safety communication layer protocol for FSCP 8/1 ................................................ 30

11.7.1 Safety PDU format ......................................................................................... 30

11.7.2 State description ............................................................................................ 38

11.8 Safety communication layer management for FSCP 8/1 ........................................ 43

11.8.1 General ......................................................................................................... 43

11.8.2 Connection establishment and confirmation processing ................................. 43

11.8.3 Safety slave verification ................................................................................. 43

11.9 System requirements for FSCP 8/1 ....................................................................... 44

---------------------- Page: 4 ----------------------
IEC 61784-3-8:2021  IEC 2021 – 3 –

11.9.1 Indicators and switches ................................................................................. 44

11.9.2 Installation guidelines .................................................................................... 45

11.9.3 Safety function response time ........................................................................ 45

11.9.4 Duration of demands ..................................................................................... 47

11.9.5 Constraints for calculation of system characteristics ...................................... 47

11.9.6 Maintenance .................................................................................................. 47

11.9.7 Safety manual ............................................................................................... 47

11.10 Assessment for FSCP 8/1 ..................................................................................... 47

12 FSCP 8/2 ....................................................................................................................... 48

12.1 Scope – FSCP 8/2 ................................................................................................ 48

12.2 Normative references – FSCP 8/2 ......................................................................... 48

12.3 Terms, definitions, symbols, abbreviated terms and conventions – FSCP 8/2 ........ 48

12.4 Overview of FSCP 8/2 (CC-Link IE™ Safety communication function) ................... 48

12.5 General – FSCP 8/2 .............................................................................................. 48

12.5.1 External documents providing specifications for the profile ............................ 48

12.5.2 Safety functional requirements ...................................................................... 49

12.5.3 Safety measures ............................................................................................ 49

12.5.4 Safety communication layer structure ............................................................ 54

12.5.5 Relationships with FAL (and DLL, PhL) .......................................................... 55

12.6 Safety communication layer services for FSCP 8/2 ............................................... 55

12.6.1 General ......................................................................................................... 55

12.6.2 Connection reestablishment services ............................................................. 55

12.6.3 Data transmission services ............................................................................ 56

12.6.4 Connection termination notification services .................................................. 57

12.7 Safety communication layer protocol for FSCP 8/2 ................................................ 57

12.7.1 Safety PDU format ......................................................................................... 57

12.7.2 Safety FAL service protocol machine (SFSPM) .............................................. 64

12.8 Safety communication layer management for FSCP 8/2 ........................................ 90

12.8.1 Parameter Definitions .................................................................................... 90

12.8.2 Parameter Setup ........................................................................................... 94

12.8.3 Management Services ................................................................................... 95

12.9 System requirements for FSCP 8/2 ....................................................................... 98

12.9.1 Indicators and switches ................................................................................. 98

12.9.2 Installation guidelines .................................................................................. 100

12.9.3 Safety function response time ...................................................................... 100

12.9.4 Duration of demands ................................................................................... 101

12.9.5 Constraints for calculation of system characteristics .................................... 101

12.9.6 Maintenance ................................................................................................ 102

12.9.7 Safety manual ............................................................................................. 102

12.10 Assessment for FSCP 8/2 ................................................................................... 103

Annex A (informative) Additional information for functional safety communication

profiles of CPF 8 ................................................................................................................. 104

A.1 Hash function calculation for FSCP 8/1 ............................................................... 104

A.2 Hash function calculation for FSCP 8/2 ............................................................... 104

A.3 Meaning of response time calculation formula for FSCP 8/2 ................................ 105

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

communication profiles of CPF 8......................................................................................... 107

Bibliography ........................................................................................................................ 108

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– 4 – IEC 61784-3-8:2021  IEC 2021

Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) ............................. 9

Figure 2 – Relationships of IEC 61784-3 with other standards (process) ............................... 10

Figure 3 – Relationship between SCL and the other layers of IEC 61158 Type 18 ................. 27

Figure 4 – State diagram ...................................................................................................... 39

Figure 5 – Detection of unintended repetition ........................................................................ 51

Figure 6 – Detection of incorrect sequence ........................................................................... 51

Figure 7 – Detection of loss .................................................................................................. 52

Figure 8 – Detection of unacceptable delay by time stamps .................................................. 53

Figure 9 – Detection of unacceptable delay by timer ............................................................. 53

Figure 10 – Protocol Hierarchy.............................................................................................. 54

Figure 11 – Safety PDU Structure ......................................................................................... 58

Figure 12 – CTRL Configuration ............................................................................................ 59

Figure 13 – SASE-M and SASE-S TS ................................................................................... 62

Figure 14 – S-Data during safety refresh .............................................................................. 62

Figure 15 – S-Data not during safety refresh ......................................................................... 63

Figure 16 – S-Data header configuration ............................................................................... 63

Figure 17 – CRC calculation ................................................................................................. 64

Figure 18 – Communication models ...................................................................................... 64

Figure 19 – SFSPM state transition diagram ......................................................................... 65

Figure 20 – Connection establishment sequence .................................................................. 67

Figure 21 – Optional sequence during connection establishment sequence .......................... 68

Figure 22 – Communication sequence during safety refresh communication ......................... 68

Figure 23 – Offset measurement and generation sequence during safety refresh

communication ...................................................................................................................... 69

Figure 24 – SFSPM-M state transition diagram ..................................................................... 70

Figure 25 – Sequence other than during safety refresh ......................................................... 74

Figure 26 – S-Connect-req .................................................................................................... 74

Figure 27 – S-InitConfirmNetPrm-req .................................................................................... 75

Figure 28 – net_prm_list ....................................................................................................... 75

Figure 29 – S-InitVerifyStnPrm-req ....................................................................................... 75

Figure 30 – stn_prm_list ....................................................................................................... 76

Figure 31 – S-InvokeFunc-req ............................................................................................... 76

Figure 32 – S-WriteErrorInfo-req ........................................................................................... 77

Figure 33 – date_and_time_of_occurence ............................................................................. 78

Figure 34 – SFSPM-S state transition diagram ...................................................................... 79

Figure 35 – Sequence other than during safety refresh ......................................................... 84

Figure 36 – S-Connect-rsp .................................................................................................... 84

Figure 37 – S-InitConfirmNetPrm-rsp .................................................................................... 85

Figure 38 – S-InitVerifyStnPrm-rsp ....................................................................................... 85

Figure 39 – S-InvokeFunc-rsp ............................................................................................... 86

Figure 40 – Offset calculation procedure of safety clock ....................................................... 87

Figure 41 – Relationship between transmission interval fluctuation and

transmission_interval ............................................................................................................ 91

Figure 42 – Calculation of allowable_refresh_interval ........................................................... 93

---------------------- Page: 6 ----------------------
IEC 61784-3-8:2021  IEC 2021 – 5 –

Figure 43 – Calculation of allowable_delay ........................................................................... 94

Figure 44 – Calculation of response time between safety PLCs .......................................... 100

Figure 45 – Constraints on N and m ............................................................................... 102

Figure A.1 – Allowable_delay and offset calculation deviation ............................................. 105

Table 1 – Selection of the various measures for possible errors ............................................ 25

Table 2 – M1 safety device manager attribute format ............................................................ 31

Table 3 – S1 safety device manager attribute format............................................................. 31

Table 4 – M1 safety connection manager attribute format ..................................................... 31

Table 5 – S1 safety connection manager attribute format ...................................................... 31

Table 6 – M1 safety cyclic transmission attribute format ....................................................... 32

Table 7 – S1 safety cyclic transmission attribute format ........................................................ 33

Table 8 – M1 safety device manager attribute encoding ........................................................ 33

Table 9 – S1 safety device manager attribute encoding ........................................................ 34

Table 10 – M1 safety connection manager attribute encoding ............................................... 34

Table 11 – S1 safety connection manager attribute encoding ................................................ 34

Table 12 – M1 safety cyclic transmission attribute encoding ................................................. 35

Table 13 – S1 safety cyclic transmission attribute encoding .................................................. 37

Table 14 – Safety master monitor timer operation ................................................................. 41

Table 15 – Safety slave monitor timer operation ................................................................... 41

Table 16 – Safety data monitor timer operation ..................................................................... 41

Table 17 – Details of connection establishment and confirmation processing ........................ 43

Table 18 – Details of slave information verification processing .............................................. 43

Table 19 – Details of safety slave parameter transmission processing .................................. 44

Table 20 – Monitor LEDs ...................................................................................................... 45

Table 21 – Safety function response time calculation ............................................................ 46

Table 22 – Safety function response time definition of terms ................................................. 46

Table 23 – Selection of the various measures for possible errors .......................................... 50

Table 24 – SS-Start .............................................................................................................. 55

Table 25 – SS-Restart .......................................................................................................... 55

Table 26 – SS-InvokeFunc .................................................................................................... 56

Table 27 – SS-Read ............................................................................................................. 56

Table 28 – SS-Write.............................................................................................................. 57

Table 29 – SS-Terminate ...................................................................................................... 57

Table 30 – Safety PDU elements .......................................................................................... 58

Table 31 – CTRL Elements ................................................................................................... 59

Table 32 – State list .............................................................................................................. 65

Table 33 – SFSPM-M timers ................................................................................................. 70

Table 34 – SFSPM-M state transition table ........................................................................... 71

Table 35 – support_functions ................................................................................................ 74

Table 36 – error_category ..................................................................................................... 77

Table 37 – error_category for AL errors ................................................................................ 77

Table 38 – error_code ........................................................................................................... 78

---------------------- Page: 7 ----------------------
– 6 – IEC 61784-3-8:2021  IEC 2021

Table 39 – SFSPM-S timers .................................................................................................. 79

Table 40 – SFSPM-S state transition table ............................................................................ 80

Table 41 – Parameters used by safety communication layer ................................................. 90

Table 42 – SM-SetSafetyStationInfo ..................................................................................... 95

Table 43 – Safety station information setting parameters of SM-SetSafetyStationInfo ........... 95

Table 44 – SM-SetSafetyNetworkParameter ......................................................................... 96

Table 45 – Safety network parameters of SM-SetSafetyNetworkParameter ........................... 96

Table 46 – SM-GetSafetyStationInfo ..................................................................................... 96

Table 47 – Safety station information parameters of SM-GetSafetyStationInfo

(Request) .............................................................................................................................. 97

Table 48 – Safety station information parameters of SM-GetSafetyStationInfo

(Response) ........................................................................................................................... 97

Table 49 – SM-GetSafetyNetworkParameter ......................................................................... 97

Table 50 – Parameters of SM-GetSafetyNetworkParameter request...................................... 97

Table 51 – Parameters of SM-GetSafetyNetworkParameter response ................................... 98

Table 52 – Monitor LEDs ...................................................................................................... 99

Table 53 – Communication port monitor LEDs ...................................................................... 99

Table A.1 – Residual error probability for FSCP 8/1 CRC .................................................... 104

Table A.2 – Residual error probability for FSCP 8/2 CRC .................................................... 105

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