IEC 61784-3-8:2021

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
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.100.05 ISBN 978-2-8322-9751-3

– 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

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

– 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

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
SE
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

– 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

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3-8: Functional safety fieldbuses –
Additional specifications for CPF 8

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 61784-3-8 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 third edition cancels and replaces the second edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• structured for compliance with IEC 61784-3 Ed.4;
• general editorial changes and clarifications;
• safety measures (11.5.3);
– 8 – IEC 61784-3-8:2021  IEC 2021
• safety application service elements (11.6.2);
• safety PDU format (11.7.1);
• constraints for calculations of system characteristics (11.9.5);
• safety measures (12.5.3);
• safety PDU format (12.7.1);
• behaviour (12.7.2);
• constraints for calculations of system characteristics (12.9.5);
• hash function calculations (Annex A).
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
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.

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 proven. Thus fieldbus enhancements continue to emerge, addressing
applications for areas such as real time and safety-related applications.
IEC 61784-3 (all parts) explains the relevant principles for functional safety communications
with reference to IEC 61508 (all parts) and specifies several safety communication layers
(profiles and corresponding protocols) based on the communication profiles and protocol
layers of IEC 61784-1, IEC 61784-2 and IEC 61158 (all parts). It does not cover electrical
safety and intrinsic safety aspects. It also does not cover security aspects, nor does it provide
any requirements for security.
Figure 1 shows the relationships between IEC 61784-3 (all parts) and relevant safety and
fieldbus standards in a machinery environment.

NOTE IEC 62061 specifies the relationship between PL (Category) and SIL.
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery)
Figure 2 shows the relationships between IEC 61784-3 (all parts) and relevant safety and
fieldbus standards in a process environment.

– 10 – IEC 61784-3-8:2021  IEC 2021

a
For specified electromagnetic environments; otherwise IEC 61326-3-1 or IEC 61000-6-7.
Figure 2 – Relationships of IEC 61784-3 with other standards (process)
Safety communication layers which are implemented as parts of safety-related systems
according to IEC 61508 (all parts) provide the necessary confidence in the transportation of
messages (information) between two or more participants on a fieldbus in a safety-related
system, or sufficient confidence of safe behaviour in the event of fieldbus errors or failures.
Safety communication layers specified in IEC 61784-3 (all parts) do this in such a way that a
fieldbus can be used for applications requiring functional safety up to the Safety Integrity
Level (SIL) specified by its corresponding functional safety communication profile.
The resulting SIL claim of a system depends on the implementation of the selected functional
safety communication profile (FSCP) within this system – implementation of a functional
safety communication profile in a standard device is not sufficient to qualify it as a safety
device.
IEC 61784-3 (all parts) describes:
• basic principles for implementing the requirements of IEC 61508 (all parts) for safety-
related data communications, including possible transmission faults, remedial measures
and considerations affecting data integrity;
• functional safety communication profiles for several communication profile families in
IEC 61784-1 and IEC 61784-2, including safety layer extensions to the communication
service and protocols sections of IEC 61158 (all parts).

0.2 Patent declaration
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning the
functional safety communication profiles for family 8. IEC takes no position concerning the
evidence, validity, and scope of this patent right.
The holder of this patent right has assured IEC that s/he is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world.
In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from the patent database available at http://patents.iec.ch.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those in the patent database. IEC shall not be held
responsible for identifying any or all such patent rights.

– 12 – IEC 61784-3-8:2021  IEC 2021
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3-8: Functional safety fieldbuses –
Additional specifications for CPF 8

1 Scope
This part of IEC 61784-3 (all parts) 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.
NOTE 2 The resulting SIL claim of a system depends on the implementation of the selected functional safety
communication profile within this system – implementation of a functional safety communication profile according to
this document in a standard device is not sufficient to qualify it as a safety device.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 61131-2, Industrial-process measurement and control – Programmable controllers –
Part 2: Equipment requirements and tests
IEC 61158 (all parts), Industrial communication networks – Fieldbus specifications
IEC 61158-2, Industrial communication networks – Fieldbus specifications – Part 2: Physical
layer specification and service definition
IEC 61158-3-18, Industrial communication networks – Fieldbus specifications – Part 3-18:
Data-link layer service definition – Type 18 elements
IEC 61158-4-18, Industrial communication networks – Fieldbus specifications – Part 4-18:
Data-link layer protocol specification – Type 18 elements
_____________
In the following pages of this document, "IEC 61508" will be used for "IEC 61508 (all parts)".

IEC 61158-5-18, Industrial communication networks – Fieldbus specifications – Part 5-18:
Application layer service definition – Type 18 elements
IEC 61158-5-23, Industrial communication networks – Fieldbus specifications – Part 5-23:
Application layer service definition – Type 23 elements
IEC 61158-6-18, Industrial communication networks – Fieldbus specifications – Part 6-18:
Application layer protocol specification – Type 18 elements
IEC 61158-6-23, Industrial communication networks – Fieldbus specifications – Part 6-23:
Application layer protocol specification – Type 23 elements
IEC 61326-3-1, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 3-1: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – General industrial
applications
IEC 61326-3-2, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 3-2: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – Industrial applications with
specified electromagnetic environment
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 61511 (all parts), Functional safety – Safety instrumented systems for the process
industry sector
IEC 61784-1, Industrial communication networks – Profiles – Part 1: Fieldbus profiles
IEC 61784-2, Industrial communication networks – Profiles – Part 2: Additional fieldbus
profiles for real-time networks based on ISO/IEC/IEEE 8802-3
IEC 61784-3:2021, Industrial communication networks – Profiles – Part 3: Functional safety
fieldbuses – General rules and profile definitions
IEC 62061, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems
ISO/IEC/IEEE 8802-3, Information technology – Telecommunications and inf
...