IEC 61784-3-1:2010

IEC 61784-3-1 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 3-1: Functional safety fieldbuses – Additional specifications for CPF 1

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IEC 61784-3-1 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Profiles –
Part 3-1: Functional safety fieldbuses – Additional specifications for CPF 1

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 25.040.40; 35.100.05 ISBN 978-2-88910-973-9
– 2 – 61784-3-1 © IEC:2010(E)
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 1: Additional terms and definitions .18
3.2 Symbols and abbreviated terms.19
3.2.1 Common symbols and abbreviated terms .19
3.2.2 CPF 1: Additional symbols and abbreviated terms .19
3.3 Conventions .20
3.3.1 State diagrams .20
3.3.2 Use of colors in figures.21
4 Overview of FSCP 1/1 (FOUNDATION Fieldbus™ SIS) .21
4.1 General .21
4.2 Key concepts of FSCP 1/1.22
4.2.1 Black channel .22
4.2.2 Connection key.22
4.2.3 Cross-check .23
4.2.4 FSCP 1/1.23
4.2.5 Programmable electronic system .23
4.2.6 Queuing delays .23
4.2.7 Redundancy .23
4.2.8 SIL environment .23
4.3 Key components of FSCP 1/1.23
4.3.1 Overview .23
4.3.2 Black channel .24
4.4 Relationship to the ISO OSI basic reference model .25
5 General .25
5.1 External documents providing specifications for the profile.25
5.2 Safety functional requirements .25
5.2.1 Requirements for functional safety.25
5.2.2 Functional constraints.26
5.2.3 Device manufacturer requirements .26
5.3 Safety measures .26
5.3.1 Sequence number .26
5.3.2 Time stamp .26
5.3.3 Time expectation .26
5.3.4 Connection authentication .26
5.3.5 Data integrity assurance.26
5.3.6 Redundancy with cross checking .27
5.3.7 Different data integrity assurance systems .27
5.3.8 Relationships between errors and safety measures .27

61784-3-1 © IEC:2010(E) – 3 –
5.4 Safety communication layer structure .27
5.4.1 Network topology and device connectivity.27
5.4.2 Device architecture.28
5.5 Relationships with FAL (and DLL, PhL) .29
5.5.1 General .29
5.5.2 Data types .29
6 Safety communication layer services .30
6.1 Application Process (AP).30
6.1.1 Overview .30
6.1.2 Network visible objects .30
6.1.3 Application layer interface .30
6.1.4 Object dictionary .30
6.1.5 Application program directory .30
6.2 Function block application processes .31
6.2.1 General .31
6.2.2 Function block model.31
6.2.3 Application process .33
6.3 Device to device communications.36
6.3.1 General .36
6.3.2 Client/server .36
6.3.3 Publisher/subscriber .37
6.3.4 Report distribution .37
6.3.5 FBAP operation in a linking device .37
6.3.6 System management kernel protocol (SMKP) communications .37
6.4 Profiles.37
6.4.1 General .37
6.4.2 FSCP 1/1 profile .37
6.5 Device descriptions .38
6.6 Common file formats .38
6.7 Configuration information .39
6.7.1 Overview .39
6.7.2 Level 1 configuration: manufacturer device definition.39
6.7.3 Level 2 configuration: network definition .39
6.7.4 Level 3 configuration: distributed application definition .39
6.7.5 Level 4 configuration: device configuration .39
7 Safety communication layer protocol .39
7.1 Safety PDU format .39
7.1.1 General .39
7.1.2 Safety communication layer CRC .39
7.1.3 Black channel time synchronization monitoring.40
7.1.4 Sequence number .40
7.1.5 Virtual header.41
7.1.6 Connection key.41
7.1.7 Redundancy and cross-check .41
7.2 Protocol extensions for use in safety-related systems.42
7.2.1 Overview .42
7.2.2 Publisher-subscriber interactions.42
7.2.3 Client-server interactions.47
7.2.4 Time synchronization.53

– 4 – 61784-3-1 © IEC:2010(E)
7.2.5 Device start-up .54
7.3 Communications entity .54
7.3.1 General .54
7.3.2 Network management.54
7.3.3 FMS .54
7.3.4 H1 stack .54
8 Safety communication layer management.55
8.1 Overview .55
8.2 SMK communications .55
8.3 FMS services .55
8.4 SMK services .55
8.4.1 General .55
8.4.2 Address assignment .55
8.4.3 Time synchronization.55
8.5 Safety communication layer configuration and start-up .55
8.5.1 H1 configuration and start-up .55
8.5.2 FSCP 1/1 FBAP.56
8.5.3 Testing .56
9 System requirements.56
9.1 Indicators and switches .56
9.2 Installation guidelines.56
9.3 Safety function response time .56
9.3.1 Overview .56
9.3.2 Safety Sensor.56
9.3.3 Input Function Block .57
9.3.4 Safe Transmission.57
9.3.5 Logic Solver .57
9.3.6 Discrete Output Function Block .57
9.3.7 Safety Actuator.57
9.4 Duration of demands .57
9.5 Constraints for calculation of system characteristics.57
9.5.1 System characteristics.57
9.5.2 Message rate.57
9.5.3 SIL level .58
9.5.4 Mixing FSCP 1/1 devices and CP 1/1 devices.58
9.5.5 Devices on a segment .58
9.5.6 Residual error rate calculations .58
9.6 Maintenance.59
9.7 Safety manual .59
10 Assessment.59
Annex A (informative) Additional information for functional safety communication
profiles of CPF 1 .60
A.1 Hash function calculation.60
A.2 Fault conditions arising from locations beyond the output function block.62
Annex B (informative) Information for assessment of the functional safety
communication profiles of CPF 1 .64
Bibliography.65

61784-3-1 © IEC:2010(E) – 5 –
Table 1 – Example state transition table .21
Table 2 – Safety measures and possible communication errors .27
Table 3 – Data types used within FSCP 1/1 .30
Table 4 – Fault state behaviour.33
Table 5 – Publisher states .43
Table 6 – Publisher state table - Received transitions .44
Table 7 – Publisher state table - Internal transitions.44
Table 8 – Subscriber states .45
Table 9 – Subscriber state table - Received transitions.46
Table 10 – Subscriber state table - Internal transitions.47
Table 11 – Server states during read operations .48
Table 12 – Received transitions for a FSCP 1/1 Server during read operations.49
Table 13 – States of a FSCP 1/1 server during write operations.51
Table 14 – Received transitions for a FSCP 1/1 Server during write operations .51
Table 15 – Values used for calculation of residual error rate.58
Table 16 – Values of R (Pe) for different values of n .58
SL
Table A.1 – Fault conditions arising from locations beyond the output function block .63

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 – Example state diagram.20
Figure 4 – Use of colors in figures .21
Figure 5 – Scope of FSCP 1/1 .22
Figure 6 – FSCP 1/1 architecture (H1) .24
Figure 7 – Black channel .24
Figure 8 – FSCP 1/1 in system architecture .28
Figure 9 – FSCP 1/1 H1 device.28
Figure 10 – FSCP 1/1 protocol layers .29
Figure 11 – Relationship between FSCP 1/1 and the other layers of IEC 61158 Type 1 .29
Figure 12 – Key write-lock .32
Figure 13 – Password write-lock .32
Figure 14 – Example of FSCP 1/1 communication.36
Figure 15 – Example of device description.38
Figure 16 – Safety PDU showing virtual content.43
Figure 17 – Safety PDU showing duplication of data and addition of CRC.43
Figure 18 – State transition diagram for a FSCP 1/1 Publisher.43
Figure 19 – Safety PDU showing duplication of data and addition of CRC.45
Figure 20 – Safety PDU showing virtual content.45
Figure 21 – State transition diagram for a FSCP 1/1 subscriber .46
Figure 22 – Safety PDU showing virtual content.48
Figure 23 – Safety PDU showing virtual content with sub index .48
Figure 24 – Safety PDU showing duplication of data, addition of sequence number and
CRC .48

– 6 – 61784-3-1 © IEC:2010(E)
Figure 25 – State transition diagram for a FSCP 1/1 Server during read operations .49
Figure 26 – Safety PDU showing duplication of data and addition of sequence number
and CRC.50
Figure 27 – Example of FSCP 1/1 write .50
Figure 28 – Example of FSCP 1/1 write with sub index .50
Figure 29 – State transition diagram for a FSCP 1/1 Server during write operations.51
Figure 30 – Safety PDU showing duplication of data and CRC.52
Figure 31 – Example of safety function response time components.56
Figure 32 – Example FSCP 1/1 network topology.57

61784-3-1 © IEC:2010(E) – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3-1: Functional safety fieldbuses –
Additional specifications for CPF 1

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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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 61784-3-1 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2007. This edition
constitutes a technical revision. The main changes with respect to the previous edition are
listed below:
⎯ updates in relation with changes in IEC 61784-3;
⎯ adjustment of Figure 5;
⎯ change of sequence number from two octets to four octets in 7.2.2 to match the final
protocol from the consortium.
⎯ addition of details for time synchronization in 7.2.4;
⎯ addition of information for safety response time in 9.3;
⎯ addition of information in constraints for calculation of system characteristics in 9.5.

– 8 – 61784-3-1 © IEC:2010(E)
The text of this standard is based on the following documents:
FDIS Report on voting
65C/591A/FDIS 65C/603/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.
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.
61784-3-1 © IEC:2010(E) – 9 –
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
IEC 61496 IEC 61800-5-2 ISO 10218-1 Safety of machinery – Principles for
IEC 61131-6
IEC 61496 IEC 61131-6 IEC 61800-5-2 ISO 10218-1 Safety of machinery – Principles for
Safety f. e.g. Safety functions Safety requirements design and risk assessment
Safety for PLC design and risk assessment
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
Design of safety-related electrical, electronic and program-
IEC 61784-4 IEC 62443
IEC 61784-4 IEC 62443
Security Security mable electronic control systems (SRECS) for machinery
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
Functional safety Test EMC & FS
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
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)

– 10 – 61784-3-1 © IEC:2010(E)
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
a)
a)
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
b)
b)
(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 standard)
industrial control systems Part 1-4
industrial control systems
Part 1-4
Key
(yellow) safety-related standards
(blue) fieldbus-related standards
(dashed yellow) this standard
a
For specified electromagnetic environments; otherwise IEC 61326-3-1.
b
EN ratified.
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 series 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 this standard 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 within this system – implementation of a functional safety
communication profile in a standard device is not sufficient to qualify it as a safety device.

61784-3-1 © IEC:2010(E) – 11 –
This standard describes:
⎯ basic principles for implementing the requirements of IEC 61508 series for safety-
related data communications, including possible transmission faults, remedial
measures and considerations affecting data integrity;
⎯ individual description of functional safety profiles for several communication profile
families in IEC 61784-1 and IEC 61784-2;
⎯ safety layer extensions to the communication service and protocols sections of the
IEC 61158 series.
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 patents concerning the
functional safety communication profiles for family 1 as follows, where the [xx] notation
indicates the holder of the patent right:
US 6,999,824 [FF] System and method for implementing safety
instrumented systems in a fieldbus architecture
IEC takes no position concerning the evidence, validity and scope of these patent rights.
The holders of these patents rights have assured the IEC that they are willing to negotiate
licences under reasonable and non-discriminatory terms and conditions with applicants
throughout the world. In this respect, the statement of the holders of these patent rights are
registered with IEC.
Information may be obtained from:
[FF] Fieldbus Foundation
9005 Mountain Ridge Drive
Bowie Bldg. - Suite 190
Austin, TX  78759-5316
USA
Tel: +1 512 794 8890
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.

– 12 – 61784-3-1 © IEC:2010(E)
INDUSTRIAL COMMUNICATION NETWORKS –
PROFILES –
Part 3-1: Functional safety fieldbuses –
Additional specifications for CPF 1

1 Scope
This part of the IEC 61784-3 series specifies a safety communication layer (services and
protocol) based on CPF 1 of IEC 61784-1 and IEC 61158 Types 1 and 9. It identifies the
principles for functional safety communications defined in IEC 61784-3 that are relevant for
this safety communication layer.
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 part 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 series for functional safety. These mechanisms may be used in
various industrial applications such as process control, manufacturing automation and
machinery.
This part 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 part in a standard device is not sufficient to qualify it as a safety device.
2 Normative references
The following referenced documents are indispensable for the application 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, Programmable controllers – Part 2: Equipment requirements and tests
IEC 61158-2, Industrial communication networks – Fieldbus specifications – Part 2: Physical
layer specification and service definition
IEC 61158-3-1, Industrial communication networks – Fieldbus specifications – Part 3-1: Data-
link layer service definition – Type 1 elements
IEC 61158-4-1, Industrial communication networks – Fieldbus specifications – Part 4-1: Data-
link layer protocol specification – Type 1 elements
IEC 61158-5-5, Industrial communication networks – Fieldbus specifications – Part 5-5:
Application layer service definition – Type 5 elements
—————————
In the following pages of this standard, “this part” will be used for “this part of the IEC 61784-3 series”.
In the following pages of this standard, “IEC 61508” will be used for “IEC 61508 series”.

61784-3-1 © IEC:2010(E) – 13 –
IEC 61158-5-9, Industrial communication networks – Fieldbus specifications – Part 5-9:
Application layer service definition – Type 9 elements
IEC 61158-6-5, Industrial communication networks – Fieldbus specifications – Part 6-5:
Application layer protocol specification – Type 5 elements
IEC 61158-6-9, Industrial communication networks – Fieldbus specifications – Part 6-9:
Application layer protocol specification – Type 9 elements
IEC 61508 (all parts), Functional safety of electrical/electronic/programmable electronic
safety-related systems
IEC 61508-1:2010 , Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 1: General requirements
IEC 61508-2:2010 , Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 2: Requirements for electrical/electronic/programmable electronic
safety-related systems
IEC 61508-3:2010 , Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 3: Software requirements
IEC 61508-4:2010 , Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 4: Definitions and abbreviations
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 61784-3:2010 , Industrial communication networks – Profiles – Part 3: Functional safety
fieldbuses – General rules and profile definitions
IEC 61918, Industrial communication networks – Installation of communication networks in
industrial premises
IEC 62280-1, Railway applications – Communication, signalling and processing systems –
Part 1: Safety-related communication in closed transmission systems
ISO/IEC 8802-3, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements – Part 3:
Carrier sense multiple access with collision detection (CSMA/CD) access method and
physical layer specifications
3 Terms, definitions, symbols, abbreviated terms and conventions
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
—————————
To be published.
To be published.
– 14 – 61784-3-1 © IEC:2010(E)
3.1.1 Common terms and definitions
3.1.1.1
availability
probability for an automated system that for a given period of time there are no unsatisfactory
system conditions such as loss of production
3.1.1.2
black channel
communication channel without available evidence of design or validation according to
IEC 61508
3.1.1.3
bridge
abstract device that connects multiple network segments along the data link layer
3.1.1.4
communication channel
logical connection between two end-points within a communication system
3.1.1.5
communication system
arrangement of hardware, software and propagation media to allow the transfer of messages
(ISO/IEC 7498 application layer) from one application to another
3.1.1.6
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