Industrial communication networks - Profiles - Part 3-18: Functional safety fieldbuses - Additional specifications for CPF 18

IEC 61784-3-18:2011 specifies a safety communication layer (services and protocol) based on CPF 18 of IEC 61784-2 and IEC 61158 Type 22. It identifies the principles for functional safety communications defined in IEC 61784-3 that are relevant for this safety communication layer.

Réseaux de communication Industriels - Profils - Partie 3-18: Bus de terrain de sécurité fonctionnelle - Spécifications supplémentaires pour le CPF 18

La CEI 61784-3-18:2011 spécifie une couche de communication relative à la sécurité (services et protocole) fondée sur le CPF 18 de la CEI 61784-2 et le type 22 de la CEI 61158. Elle identifie les principes applicables aux communications de sécurité fonctionnelle définies dans la CEI 61784-3, et appropriés à cette couche de communication de sécurité.

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Publication Date
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IEC 61784-3-18
Edition 1.0 2011-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles
Part 3-18: Functional safety fieldbuses – Additional specifications for CPF 18
Réseaux de communication industriels – Profils
Partie 3-18: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour le CPF 18
IEC 61784-3-18:2011
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61784-3-18
Edition 1.0 2011-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Profiles
Part 3-18: Functional safety fieldbuses – Additional specifications for CPF 18
Réseaux de communication industriels – Profils
Partie 3-18: Bus de terrain de sécurité fonctionnelle – Spécifications
supplémentaires pour le CPF 18
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XB
ICS 13.110, 25.040.40, 35.100.05 ISBN 978-2-88912-475-6
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61784-3-18  IEC:2011
CONTENTS

FOREWORD ........................................................................................................................... 5

0 Introduction ...................................................................................................................... 7

0.1 General ................................................................................................................... 7

0.2 Patent declaration ................................................................................................... 9

1 Scope ............................................................................................................................. 10

2 Normative references ..................................................................................................... 10

3 Terms, definitions, symbols, abbreviated terms and conventions .................................... 11

3.1 Terms and definitions ............................................................................................ 11

3.1.1 Common terms and definitions .................................................................. 11

3.1.2 CPF 18: Additional terms and definitions ................................................... 15

3.2 Symbols and abbreviated terms............................................................................. 16

3.2.1 Common symbols and abbreviated terms .................................................. 16

3.2.2 CPF 18: Additional symbols and abbreviated terms ................................... 17

3.3 Conventions .......................................................................................................... 17

4 Overview of FSCP 18/1 (SafetyNET p™) ........................................................................ 19

4.1 General ................................................................................................................. 19

4.2 FSCP 18/1 ............................................................................................................ 19

5 General .......................................................................................................................... 20

5.1 External documents providing specifications for the profile .................................... 20

5.2 Safety functional requirements .............................................................................. 20

5.3 Safety measures ................................................................................................... 20

5.4 Safety communication layer structure .................................................................... 21

5.5 Relationships with FAL (and DLL, PhL) ................................................................. 22

5.5.1 General ..................................................................................................... 22

5.5.2 Data Types ................................................................................................ 22

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

6.1 General elements .................................................................................................. 22

6.1.1 General ..................................................................................................... 22

6.1.2 Safety object dictionary ............................................................................. 22

6.1.3 Safety process data object (SPDO) ........................................................... 22

6.1.4 Safety heartbeat (SHB) .............................................................................. 22

6.1.5 Safety delay monitoring (SDM) .................................................................. 23

6.2 Communication relation ......................................................................................... 23

7 Safety communication layer protocol .............................................................................. 24

7.1 Safety PDU format ................................................................................................ 24

7.1.1 General ..................................................................................................... 24

7.1.2 Safety process data objects (SPDO) .......................................................... 24

7.1.3 Safety heartbeat (SHB) .............................................................................. 26

7.1.4 Safety PDUs embedded in a Type 22 PDU ................................................ 28

7.2 Safety communication layer management (SALMT) ............................................... 28

7.3 Safety process data communication ...................................................................... 30

7.4 Safety heartbeat .................................................................................................... 32

7.5 Delay monitoring ................................................................................................... 33

8 Safety communication layer management ....................................................................... 34

8.1 Parameter handling ............................................................................................... 34

8.2 Safety object dictionary ......................................................................................... 34

---------------------- Page: 4 ----------------------
61784-3-18  IEC:2011 – 3 –

8.2.1 General ..................................................................................................... 34

8.2.2 Communication profile section ................................................................... 35

8.2.3 Standardized device profile section ........................................................... 51

9 System requirements ...................................................................................................... 51

9.1 Indicators and switches ......................................................................................... 51

9.1.1 Indicator states and flash rates .................................................................. 51

9.1.2 Indicators .................................................................................................. 51

9.1.3 Switches .................................................................................................... 52

9.2 Installation guidelines ............................................................................................ 52

9.3 Safety function response time ............................................................................... 52

9.3.1 General ..................................................................................................... 52

9.3.2 Determination of FSCP 18/1 time expectation behavior ............................. 53

9.3.3 Calculation of the worst case safety function response time ...................... 53

9.4 Duration of demands ............................................................................................. 53

9.5 Constraints for calculation of system characteristics .............................................. 53

9.5.1 Safety related constraints .......................................................................... 53

9.5.2 Probabilistic considerations ....................................................................... 55

9.6 Maintenance .......................................................................................................... 55

9.7 Safety manual ....................................................................................................... 55

10 Assessment .................................................................................................................... 55

Annex A (informative) Additional information for functional safety communication

profiles of CPF 18 ................................................................................................................. 57

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

communication profiles of CPF 18 ......................................................................................... 58

Bibliography .......................................................................................................................... 59

Table 1 – Object definition .................................................................................................... 18

Table 2 – Safety PDU element definition ............................................................................... 18

Table 3 – Communication errors and detection measures ..................................................... 21

Table 4 – SPDO PDU structure ............................................................................................. 25

Table 5 – SHB request PDU structure ................................................................................... 26

Table 6 – SHB response PDU structure ................................................................................ 27

Table 7 – SHB safety communication layer state encoding ................................................... 27

Table 8 – SALMT commands ................................................................................................ 28

Table 9 – System states of SALMT state machine................................................................. 29

Table 10 – State transitions SALMT state machine ............................................................... 30

Table 11 – System states of RxSPDO state machine ............................................................ 31

Table 12 – State transitions RxSPDO state machine ............................................................. 31

Table 13 – Timeouts ............................................................................................................. 32

Table 14 – Safety object dictionary structure ........................................................................ 34

Table 15 – Objects of communication section ....................................................................... 35

Table 16 – Device type ......................................................................................................... 36

Table 17 – Safety ID ............................................................................................................. 37

Table 18 – Safety consumer heartbeat entry ......................................................................... 37

Table 19 – Safety consumer heartbeat .................................................................................. 38

---------------------- Page: 5 ----------------------
– 4 – 61784-3-18  IEC:2011

Table 20 – Safety producer heartbeat parameter .................................................................. 39

Table 21 – Safety bus cycle times ......................................................................................... 42

Table 22 – SPDO timeout tolerance ...................................................................................... 43

Table 23 – Receive SPDO communication parameter ........................................................... 43

Table 24 – Transmit SPDO communication parameter .......................................................... 46

Table 25 – Mapping format ................................................................................................... 49

Table 26 – Receive SPDO mapping parameter ..................................................................... 49

Table 27 – Transmit SPDO mapping parameter .................................................................... 50

Table 28 – Indicator states definiton ..................................................................................... 51

Table 29 – STATUS indicator states ..................................................................................... 51

Figure 1 – Relationships of IEC 61784-3 with other standards (machinery) ............................. 7

Figure 2 – Relationships of IEC 61784-3 with other standards (process) ................................. 8

Figure 3 – FSCP 18/1 system ............................................................................................... 19

Figure 4 – FSCP 18/1 software architecture .......................................................................... 21

Figure 5 – SPDO interaction model ....................................................................................... 23

Figure 6 – SHB interaction model ......................................................................................... 23

Figure 7 – Safety process data object structure .................................................................... 24

Figure 8 – Safety heartbeat request structure ....................................................................... 26

Figure 9 – Safety heartbeat response structure ..................................................................... 26

Figure 10 – Safety PDU for FSCP 18/1 embedded in a Type 22 CDC data section ................ 28

Figure 11 – SALMT state machine ........................................................................................ 29

Figure 12 – RxSPDO state machine ...................................................................................... 31

Figure 13 – Heartbeat procedure .......................................................................................... 32

Figure 14 – Delay measurement principle ............................................................................. 33

Figure 15 – Parameter handling ............................................................................................ 34

Figure 16 – Safety response time components ...................................................................... 52

Figure 17 – Considered data fields for message size calculation ........................................... 54

Figure 18 – Residual error rate ............................................................................................. 55

---------------------- Page: 6 ----------------------
61784-3-18 © IEC:2011 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES
Part 3-18: Functional safety fieldbuses –
Additional specifications for CPF 18
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

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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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.

International Standard IEC 61784-3-18 has been prepared by subcommittee 65C: Industrial

networks, of IEC technical committee 65: Industrial process measurement, control and

automation.

This standard cancels and replaces IEC/PAS 61784-3-18 published in 2009. This first edition

constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/639/FDIS 65C/649/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 7 ----------------------
– 6 – 61784-3-18  IEC:2011

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 publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication 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.
---------------------- Page: 8 ----------------------
61784-3-18  IEC:2011 – 7 –
0 Introduction
0.1 General

The IEC 61158 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 many fieldbus enhancements are emerging, addressing not yet standardized

areas such as real time, safety-related and security-related applications.

This standard explains the relevant principles for functional safety communications with

reference to IEC 61508 series 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 the IEC 61158 series. It does not cover electrical safety and

intrinsic safety aspects.

Figure 1 shows the relationships between this standard and relevant safety and fieldbus

standards in a machinery environment.
Product standards
ISO 12100-1 and ISO 14121
ISO 12100-1 and ISO 14121
Safety of machinery – Principles for
IEC 61496 IEC 61131-6 IEC 61800-5-2 ISO 10218-1
IEC 61496 IEC 61800-5-2 ISO 10218-1 Safety of machinery – Principles for
IEC 61131-6
design and risk assessment
Safety f. e.g. Safety functions Safety requirements

Safety f. e.g. Safety for PLC Safety functions Safety requirements design and risk assessment

Safety for PLC
(under consideration)
light curtains for drives for robots
light curtains (under consideration) for drives for robots
Design of safety-related electrical, electronic and program-
IEC 61784-4 IEC 62443
IEC 61784-4 IEC 62443
mable electronic control systems (SRECS) for machinery
Security Security
Security Security
(profile-specific) (common part)
(profile-specific) (common part)
SIL based PL based
IEC 61784-5 IEC 61918
IEC 61784-5 IEC 61918
Installation guide Installation guide
Installation guide Installation guide Design objective
(profile-specific) (common part)
(profile-specific) (common part)
Applicable standards
ISO 13849-1, -2
ISO 13849-1, -2
IEC 60204-1
IEC 60204-1
Safety-related parts
Safety-related parts
Safety of electrical
Safety of electrical
IEC 61000-1-2
IEC 61000-1-2 of machinery
of machinery
equipment
equipment
Methodology EMC & FS
Methodology EMC & FS (SRPCS)
(SRPCS)
IEC 61326-3-1
IEC 61784-3
IEC 61784-3 IEC 61326-3-1
Non-electrical
Non-electrical
Test EMC & FS
Functional safety
Functional safety Test EMC & FS
communication
communication
Electrical
Electrical
US: NFPA 79
US: NFPA 79
profiles
profiles
(2006)
(2006)
IEC 62061
IEC 62061
Functional safety
Functional safety
IEC 61158 series /
IEC 61158 series /
for machinery
for machinery
IEC 61784-1, -2 IEC 61508 series
IEC 61784-1, -2 IEC 61508 series (SRECS)
(SRECS)
Functional safety (FS)
Fieldbus for use in Functional safety (FS) (including EMC for
Fieldbus for use in
(including EMC for
(basic standard)
(basic standard) industrial environment)
industrial control systems industrial environment)
industrial control systems
Key
(yellow) safety-related standards
(blue) fieldbus-related standards
(dashed yellow) this standard
IEC 768/11

NOTE Subclauses 6.7.6.4 (high complexity) and 6.7.8.1.6 (low complexity) of IEC 62061 specify the relationship

between PL (Category) and SIL.
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery)
---------------------- Page: 9 ----------------------
– 8 – 61784-3-18  IEC:2011

Figure 2 shows the relationships between this standard and relevant safety and fieldbus

standards in a process environment.
Product standards
IEC 61496 IEC 61800-5-2 ISO 10218-1
IEC 61131-6
IEC 61496 IEC 61131-6 IEC 61800-5-2 ISO 10218-1
Safety f. e.g. Safety functions Safety requirements
Safety for PLC
Safety f. e.g. Safety for PLC Safety functions Safety requirements
light curtains (under consideration) for drives for robots
(under consideration)
light curtains for drives for robots
IEC 61784-4 IEC 62443
IEC 61784-4 IEC 62443
Security Security
Security Security
(profile-specific) (common part)
(profile-specific) (common part)
See safety standards for machinery
(Figure 1)
IEC 61784-5 IEC 61918
IEC 61784-5 IEC 61918
Installation guide Installation guide
Installation guide Installation guide
(profile-specific) (common part)
(profile-specific) (common part)
Valid also in process industries,
whenever applicable
IEC 61326-3-2
IEC 61326-3-2
EMC and
EMC and
functional safety
functional safety
IEC 61784-3
IEC 61784-3
Functional safety
Functional safety
communication
communication
profiles
profiles
US:
US:
ISA-84.00.01
ISA-84.00.01
(3 parts = modified
IEC 61511 series
IEC 61511 series (3 parts = modified
IEC 61511)
Functional safety –
IEC 61158 series / Functional safety – IEC 61511)
IEC 61158 series /
Safety instrumented
Safety instrumented
IEC 61784-1, -2 IEC 61508 series
IEC 61784-1, -2 IEC 61508 series
systems for the
systems for the
Fieldbus for use in Functional safety (FS)
Functional safety (FS)
Fieldbus for use in DE: VDI 2180
process industry sector DE: VDI 2180
process industry sector
(basic standard)
(basic stand
...

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