IEC 61784-3-3:2021

IEC 61784-3-3 ®
Edition 4.0 2021-05
INTERNATIONAL
STANDARD
NORME
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colour
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Industrial communication networks – Profiles –
Part 3-3: Functional safety fieldbuses – Additional specifications for CPF 3

Réseaux de communication industriels – Profils –
Partie 3-3: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour CPF 3
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IEC 61784-3-3 ®
Edition 4.0 2021-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles –

Part 3-3: Functional safety fieldbuses – Additional specifications for CPF 3

Réseaux de communication industriels – Profils –

Partie 3-3: Bus de terrain de sécurité fonctionnelle – Spécifications

supplémentaires pour CPF 3
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-9749-0

– 2 – IEC 61784-3-3:2021  IEC 2021
CONTENTS
FOREWORD . 9
0 Introduction . 11
0.1 General . 11
0.2 Patent declaration . 12
1 Scope . 14
2 Normative references . 14
3 Terms, definitions, symbols, abbreviated terms and conventions . 16
3.1 Terms and definitions . 16
3.1.1 Common terms and definitions . 16
3.1.2 CPF 3: Additional terms and definitions . 22
3.2 Symbols and abbreviated terms . 27
3.2.1 Common symbols and abbreviated terms . 27
3.2.2 CPF 3: Additional symbols and abbreviated terms . 28
3.3 Conventions . 29
4 Overview of FSCP 3/1 (PROFIsafe™). 29
5 General . 32
5.1 External documents providing specifications for the profile . 32
5.2 Safety functional requirements . 32
5.3 Safety measures . 32
5.4 Safety communication layer structure . 33
5.4.1 Principle of FSCP 3/1 safety communications . 33
5.4.2 CPF 3 communication structures . 35
5.5 Relationships with FAL (and DLL, PhL) . 37
5.5.1 Device model . 37
5.5.2 Application and communication relationships . 38
5.5.3 Data types . 38
6 Safety communication layer services . 39
6.1 F-Host driver services . 39
6.2 F-Device driver services . 43
6.3 Diagnosis . 45
6.3.1 Safety alarm generation . 45
6.3.2 F-(Sub)Module safety layer diagnosis . 45
7 Safety communication layer protocol . 46
7.1 Safety PDU format . 46
7.1.1 Safety PDU structure . 46
7.1.2 Safety IO data . 47
7.1.3 Status and Control Byte . 47
7.1.4 (Virtual) MonitoringNumber . 49
7.1.5 (Virtual) MNR mechanism (F_CRC_Seed=0) . 50
7.1.6 (Virtual) MNR mechanism (F_CRC_Seed=1) . 50
7.1.7 CRC2 Signature (F_CRC_Seed=0) . 52
7.1.8 CRC2 Signature (F_CRC_Seed=1) . 53
7.1.9 Non-safety IO data . 54
7.2 FSCP 3/1 behavior . 54
7.2.1 General . 54

7.2.2 F-Host driver state diagram . 55
7.2.3 F-Device driver state diagram . 58
7.2.4 F-Device driver restart . 62
7.2.5 Sequence diagrams . 62
7.2.6 Timing diagram for a MonitoringNumber reset . 69
7.2.7 Monitoring of safety times . 69
7.3 Reaction in the event of a malfunction . 72
7.3.1 Corruption of safety data . 72
7.3.2 Unintended repetition . 72
7.3.3 Incorrect sequence . 73
7.3.4 Loss . 73
7.3.5 Unacceptable delay . 73
7.3.6 Insertion . 73
7.3.7 Masquerade. 73
7.3.8 Addressing . 73
7.3.9 Out-of-sequence . 74
7.3.10 Loop-back. 74
7.3.11 Network boundaries and router . 74
7.4 F-Startup and parameter change at runtime . 75
7.4.1 Standard startup procedure . 75
8 Safety communication layer management . 75
8.1 F-Parameter. 75
8.1.1 Summary . 75
8.1.2 F_Source/Destination_Address (Codename) . 76
8.1.3 F_WD_Time (F-Watchdog time) . 77
8.1.4 F_WD_Time_2 (secondary F-Watchdog time) . 77
8.1.5 F_Prm_Flag1 (Parameters for the safety layer management) . 77
8.1.6 F_Prm_Flag2 (Parameters for the safety layer management) . 80
8.1.7 F_iPar_CRC (value of iPar_CRC across iParameters) . 81
8.1.8 F_Par_CRC calculation (across F-Parameters) . 81
8.1.9 Structure of the F-Parameter record data object . 82
8.2 iParameter and iPar_CRC . 82
8.3 Safety parameterization . 83
8.3.1 Objectives . 83
8.3.2 GSDL and GSDML safety extensions . 84
8.3.3 Securing safety parameters and GSD data . 86
8.4 Safety configuration . 90
8.4.1 Order of IO data types . 90
8.4.2 Securing the safety IO data description . 90
8.4.3 DataItem data type section examples . 91
8.5 Data type information usage . 95
8.5.1 F-Host Channel driver . 95
8.5.2 Rules for standard F-Host Channel drivers . 96
8.5.3 Recommendations for the use of F-Host Channel drivers . 97
8.6 Safety parameter assignment mechanisms . 98
8.6.1 F-Parameter assignment . 98
8.6.2 General iParameter assignment . 98
8.6.3 System integration requirements for iParameterization tools . 98
8.6.4 iPar-Server . 100

– 4 – IEC 61784-3-3:2021  IEC 2021
9 System requirements . 111
9.1 Indicators and switches . 111
9.2 Installation guidelines . 111
9.3 Safety function response time . 111
9.3.1 Model . 111
9.3.2 Calculation and optimization . 113
9.3.3 Adjustment of watchdog times for FSCP 3/1 . 115
9.3.4 Engineering tool support . 116
9.3.5 Retries (repetition of messages) . 116
9.4 Duration of demands . 117
9.5 Constraints for the calculation of system characteristics . 117
9.5.1 Probabilistic considerations . 117
9.5.2 Safety related assumptions . 119
9.5.3 Non safety related constraints (availability) . 120
9.6 Maintenance . 120
9.6.1 F-(Sub)Module commissioning / replacement . 120
9.6.2 Identification and maintenance functions . 120
9.7 Safety manual . 121
9.8 Wireless transmission channels . 122
9.8.1 Black channel approach . 122
9.8.2 Availability . 122
9.8.3 Security measures . 122
9.8.4 Stationary and mobile applications . 122
9.9 Relationship between functional safety and security . 123
9.10 Conformance classes . 123
10 Assessment . 125
10.1 Safety policy . 125
10.2 Obligations . 125
Annex A (informative) Additional information for functional safety communication
profiles of CPF 3 . 126
A.1 Hash function calculation . 126
A.2 Example values for MonitoringNumbers (MNR) . 130
Annex B (informative) Information for assessment of the functional safety
communication profiles of CPF 3. 131
Annex C (normative) Optional features . 132
C.1 Reaction on Device_Fault in F-Host . 132
C.1.1 Situation . 132
C.1.2 Documentation for the user . 132
C.1.3 Optional extensions of F-Host driver Transition Table . 132
C.1.4 Recommendation for the case without Extensions of F-Host driver
Transitions . 135
C.2 Optional extensions of F-Host driver to "Disable F-(Sub)Module" . 135
C.3 Combination of "Disable F-(Sub)Module" and "reaction on Device_Fault" . 139
C.4 FSCP 3/1 and PROFIenergy . 141
C.4.1 Use of FSCP 3/1-Devices with PROFIenergy . 141
C.4.2 Sequence in case of PROFIenergy power off on . 141
C.5 Requirement multiple F-Hosts communicate with single F-(Sub)Module . 141
C.6 FSCP 3/1 PiR . 142
Bibliography . 143

Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) . 11
Figure 2 – Relationships of IEC 61784-3 with other standards (process) . 12
Figure 3 – Basic communication preconditions for FSCP 3/1. 30
Figure 4 – Structure of an FSCP 3/1 safety PDU . 30
Figure 5 – Safety communication on CPF 3 . 31
Figure 6 – Standard CPF 3 transmission system . 34
Figure 7 – Safety layer architecture . 35
Figure 8 – Basic communication layers . 35
Figure 9 – Crossing network borders with routers . 36
Figure 10 – Complete safety transmission paths . 37
Figure 11 – IO Device model . 38
Figure 12 – FSCP 3/1 communication structure . 39
Figure 13 – F application interface of F-Host driver instances . 40
Figure 14 – Motivation for "Channel-related Passivation" . 41
Figure 15 – F-Device driver interfaces . 43
Figure 16 – Safety PDU for CPF 3 . 47
Figure 17 – Status Byte . 47
Figure 18 – Control Byte . 48
Figure 19 – The Toggle Bit function . 49
Figure 20 – MonitoringNumber integration . 50
Figure 21 – F-Host driver CRC2 signature generation (F_CRC_Seed=0) . 52
Figure 22 – Details of the CRC2 signature calculation (F_CRC_Seed=0) . 53
Figure 23 – CRC2 signature calculation (F_CRC_Seed=1) . 53
Figure 24 – Details of the CRC2 signature calculation (F_CRC_Seed=1) . 54
Figure 25 – Safety layer communication relationship . 54
Figure 26 – F-Host driver state diagram . 55
Figure 27 – F-Device driver state diagram . 59
Figure 28 – Interaction F-Host driver / F-Device driver during start-up . 63
Figure 29 – Interaction F-Host driver / F-Device driver during F-Host power off > on . 64
Figure 30 – Interaction F-Host driver / F-Device driver with delayed power on . 65
Figure 31 – Interaction F-Host driver / F-Device driver during power off → on . 66
Figure 32 – Interaction while F-Host driver recognizes CRC error . 67
Figure 33 – Interaction while F-Device driver recognizes CRC error . 68
Figure 34 – Impact of the MNR reset signal . 69
Figure 35 – Monitoring the message transit time F-Host ↔ F-(Sub)Module . 70
Figure 36 – Extended watchdog time on request . 72
Figure 37 – Effect of F_WD_Time_2 . 77
Figure 38 – F_Prm_Flag1 . 78
Figure 39 – F_Check_iPar . 78
Figure 40 – F_SIL . 78
Figure 41 – F_CRC_Length . 79
Figure 42 – F_CRC_Seed . 79

– 6 – IEC 61784-3-3:2021  IEC 2021
Figure 43 – F_Prm_Flag2 . 80
Figure 44 – F_Passivation . 80
Figure 45 – F_Block_ID . 80
Figure 46 – F_Par_Version . 81
Figure 47 – F-Parameter . 82
Figure 48 – iParameter block . 83
Figure 49 – F-Parameter extension within the GSDML specification . 85
Figure 50 – F_Par_CRC signature including iPar_CRC . 86
Figure 51 – F-Host Channel driver as "glue" between F-(Sub)Module and application
program . 96
Figure 52 – Layout example of an F-Host Channel driver . 97
Figure 53 – F-Parameter assignment for F-(Sub)Modules . 98
Figure 54 – System integration of CPD-Tools . 99
Figure 55 – iPar-Server mechanism (commissioning) . 100
Figure 56 – iPar-Server mechanism (for example F-(Sub)Module replacement) . 102
Figure 57 – iPar-Server request coding ("status model") . 103
Figure 58 – Coding of SR_Type . 104
Figure 59 – iPar-Server request coding ("alarm model") . 105
Figure 60 – iPar-Server state diagram . 108
Figure 61 – Example safety function with a critical response time path . 112
Figure 62 – Simplified typical response time model . 112
Figure 63 – Frequency distributions of typical response times of the model . 113
Figure 64 – Context of delay times and watchdog times . 114
Figure 65 – Timing sections forming the FSCP 3/1 F_WD_Time . 115
Figure 66 – Frequency distribution of response times with message retries . 116
Figure 67 – Residual error probabilities for the 24-bit CRC polynomial . 117
Figure 68 – Residual error probabilities for the 32-bit CRC polynomial . 118
Figure 69 – Monitoring of corrupted messages . 119
Figure A.1 – Typical "C" procedure of a cyclic redundancy check . 126
Figure C.1 – F-Host driver application interface with feature Reaction on Device_Fault . 132
Figure C.2 – F-Host driver application interface with feature Disable F-(Sub)Module . 136
Figure C.3 – Timing diagram to use Disable F-(Sub)Module . 136

Table 1 – Deployed measures to master errors . 33
Table 2 – Data types for FSCP 3/1 . 38
Table 3 – F_MessageTrailer for FSCP 3/1 . 38
Table 4 – Safety layer diagnosis messages . 45
Table 5 – Buffer entry on CRC2 error . 46
Table 6 – MonitoringNumber of an F-Host driver SPDU . 50
Table 7 – MonitoringNumber of an F-Device driver SPDU . 50
Table 8 – MonitoringNumber of an F-Host driver SPDU . 51
Table 9 – MonitoringNumber of an F-Device driver SPDU . 51
Table 10 – Definition of terms used in F-Host driver state diagram. 55

Table 11 – F-Host driver states and transitions . 56
Table 12 – Definition of terms used in Figure 27 . 59
Table 13 – F-Device driver states and transitions . 60
Table 14 – SIL monitor times . 71
Table 15 – Safety network boundaries . 75
Table 16 – Codename octet order . 76
Table 17 – Allowed combinations of F_CRC_Seed and F_Passivation . 79
Table 18 – GSDL keywords for F-Parameters and F-IO structures . 84
Table 19 – Algorithm to build CRC0 . 87
Table 20 – GSD example in GSDL notation. 88
Table 21 – GSD example in GSDML notation . 89
Table 22 – Serialized octet stream for the examples . 89
Table 23 – Order of IO data types . 90
Table 24 – IO data structure items . 91
Table 25 – DataItem section for F_IN_OUT_1 . 92
Table 26 – DATA_STRUCTURE_CRC for F_IN_OUT_1 . 92
Table 27 – DataItem section for F_IN_OUT_2 . 93
Table 28 – DATA_STRUCTURE_CRC for F_IN_OUT_2 . 93
Table 29 – DataItem section for F_IN_OUT_5 . 94
Table 30 – DATA_STRUCTURE_CRC for F_IN_OUT_5 . 94
Table 31 – DataItem section for F_IN_OUT_6 . 95
Table 32 – DATA_STRUCTURE_CRC for F_IN_OUT_6 . 95
Table 33 – Sample F-Host Channel drivers . 96
Table 34 – Requirements for iParameterization . 99
Table 35 – Specifier for the iPar-Server Request . 104
Table 36 – Structure of the Read_RES_PDU ("read record") . 106
Table 37 – Structure of the Write_REQ_PDU ("write record") . 106
Table 38 – Structure of the Pull_RES_PDU ("Pull") . 106
Table 39 – Structure of the Push_REQ_PDU ("Push"). 107
Table 40 – iPar-Server states and transitions . 109
Table 41 – iPar-Server management measures . 110
Table 42 – Definition of terms in Figure 69 . 119
Table 43 – Information to be included in the safety manual . 121
Table 44 – F-Host conformance class requirements . 123
Table 45 – Main characteristics of protocol versions . 124
Table 46 – F-Host driver / F-Device driver conformance matrix . 124
Table A.1 – The table "Crctab24" for 24 bit CRC signature calculations . 127
Table A.2 – The table "Crctab32" for 32 bit CRC signature calculations . 128
Table A.3 – The table "Crctab16" for 16 bit CRC signature calculations . 129
Table A.4 – Values of CN_incrNR_64 and MNR for F-Host PDU . 130
Table C.1 – Definition of additional terms used in driver transitions . 133
Table C.2 – F-Host driver transitions – added with reaction on Device_Fault . 133
Table C.3 – Prevent unintentional restart by application measures. 135

– 8 – IEC 61784-3-3:2021  IEC 2021
Table C.4 – F-Host driver transitions – with feature Disable F-(Sub)Module . 137
Table C.5 – F-Host driver transitions – added with "reaction on Device_Fault" and
"Disable F-(Sub)Module" . 139

INTERNATIONAL ELECTROTECHNICAL COMMISSION
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INDUSTRIAL COMMUNICATION NETWORKS –
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Part 3-3: Functional safety fieldbuses –
Additional specifications for CPF 3

FOREWORD
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IEC 61784-3-3 has been prepared by subcommittee 65C: Industrial networks, of IEC technical
committee 65: Industrial-process measurement, control and automation. It is an International
Standard.
This fourth edition cancels and replaces the third edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• editorial changes regarding timeliness, transformation of comments in the chart into
instructions;
• use abbreviations of PROFINET;
• information added about checks and safety manual for PROFIsafe Address Type 1 and 2;
• information added about PFDavg, support of automatic test, add diagnosis messages;

– 10 – IEC 61784-3-3:2021  IEC 2021
• explanation and specification of optional statemachines for reaction on device fault;
• new optional variable "OAD_Nec_C" for optional feature "Reaction of Device_Fault in
F_Host";
• specification of the optional F-Host feature for "Disable F-(Sub)Module";
• specify requirements for FSCP 3/1 and PROFIenergy;
• specify requirement for multiple F-Hosts communicating with a single F-(Sub)Module;
Update of the Safety Manual;
• diverse error corrections, fixes of typos, and reference updates;
• updated bibliography.
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/1083/FDIS 65C/1087/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of the IEC 61784-3 series, published under the general title Industrial
communication networks – Profiles – Functional safety fieldbuses, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
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0 Introduction
0.1 General
The IEC 61158 (all parts) fieldbus standard together with its companion standards IEC 61784-1
and IEC 61784-2 defines a set of communication protocols that enable distributed control of
automation applications. Fieldbus technology is now considered well accepted and well pr
...