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BS EN 61784-3:2010

BS EN 61784-3:2010

$198.66

Industrial communication networks. Profiles – Functional safety fieldbuses. General rules and profile definitions

Published By Publication Date Number of Pages
BSI 2010 66
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This part of the IEC 61784-3 series explains some common principles than can be used in the transmission of safety-relevant messages among participants within a distributed network using fieldbus technology in accordance with the requirements of IEC 61508 series1 for functional safety. These principles can be used in various industrial applications such as process control, manufacturing automation and machinery.

This part2 and the IEC 61784-3-x parts specify several functional safety communication profiles based on the communication profiles and protocol layers of the fieldbus technologies in IEC 61784-1, IEC 61784-2 and the IEC 61158 series.

NOTE 1 Other safety-related communication systems meeting the requirements of IEC 61508 series may exist that are not included in this standard.

NOTE 2 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.

All systems are exposed to unauthorized access at some point of their life cycle. Additional measures need to be considered in any safety-related application to protect fieldbus systems against unauthorized access. The IEC 62443 series will address many of these issues; the relationship with the IEC 62443 series is detailed in a dedicated subclause of this part.

NOTE 3 Additional profile specific requirements for security may also be specified in IEC 61784-43 [10].

NOTE 4 Implementation of a functional safety communication profile according to this part in a device is not sufficient to qualify it as a safety device, as defined in IEC 61508 series.

NOTE 5 The resulting SIL claim of a system depends on the implementation of the selected functional safety communication profile within this system.

PDF Catalog

PDF Pages PDF Title
8 CONTENTS
0 Introduction
0.1 General
0.2 Patent declaration
12 Figures
Figure 1 – Relationships of IEC 61784-3 with other standards (machinery)
13 Figure 2 – Relationships of IEC 61784-3 with other standards (process)
15 1 Scope
2 Normative references
17 3 Terms, definitions, symbols, abbreviated terms and conventions
3.1 Terms and definitions
23 3.2 Symbols and abbreviated terms
24 4 Conformance
25 5 Basics of safety-related fieldbus systems
5.1 Safety function decomposition
5.2 Communication system
Figure 3 – Safety communication as a part of a safety function
26 Figure 4 – Example model of a functional safety communication system
27 5.3 Communication errors
Figure 5 – Example of safety function response time components
28 5.4 Deterministic remedial measures
30 5.5 Relationships between errors and safety measures
31 5.6 Data integrity considerations
Tables
Table 1 – Overview of the effectiveness of the various measures on the possible errors
32 Table 2 – Definition of items used for calculation of the residual error rate
33 5.7 Relationship between functional safety and security
Figure 6 – Example application
Table 3 – Relationship of residual error rate to SIL level
34 5.8 Boundary conditions and constraints
5.9 Installation guidelines
5.10 Safety manual
5.11 Safety policy
35 6 Communication Profile Family 1 (Foundation™ Fieldbus) – Profiles for functional safety
6.1 Functional Safety Communication Profile 1/1
6.2 Technical overview
36 7 Communication Profile Family 2 (CIP™) – Profiles for functional safety
7.1 Functional Safety Communication Profile 2/1
7.2 Technical overview
Figure 7 – Scope of FSCP 1/1
37 Figure 8 – Relationship of Safety Validators
38 8 Communication Profile Family 3 (PROFIBUS™, PROFINET™) – Profiles for functional safety
8.1 Functional Safety Communication Profile 3/1
8.2 Technical overview
39 Figure 9 – Basic communication preconditions for FSCP 3/1
Figure 10 – Structure of a FSCP 3/1 safety PDU
40 9 Communication Profile Family 6 (INTERBUS®) – Profiles for functional safety
9.1 Functional Safety Communication Profile 6/7
Figure 11 – Safe communication modes
41 9.2 Technical overview
Figure 12 – FSCP 6/7 communication preconditions
Table 4 – Overview of profile identifier usable for FSCP 6/7
42 10 Communication Profile Family 8 (CC-Link™) – Profiles for functional safety
10.1 Functional Safety Communication Profile 8/1
10.2 Technical overview
43 11 Communication Profile Family 12 (EtherCAT™) – Profiles for functional safety
11.1 Functional Safety Communication Profile 12/1
11.2 Technical overview
Figure 13 – Basic FSCP 12/1 system
44 12 Communication Profile Family 13 (Ethernet POWERLINK™) – Profiles for functional safety
12.1 Functional Safety Communication Profile 13/1
12.2 Technical overview
45 13 Communication Profile Family 14 (EPA®) – Profiles for functional safety
13.1 Functional Safety Communication Profile 14/1
Figure 14 – Producer consumer example
Figure 15 – Client server example
46 13.2 Technical overview
Figure 16 – FSCP 14/1 safety communication architecture
47 Annex A (informative) Example functional safety communication models
Figure A.1 – Model A
48 Figure A.2 – Model B
Figure A.3 – Model C
49 Figure A.4 – Model D
50 Annex B (informative) A safety communication channel model using CRC-based error checking
Figure B.1 – Communication channel with perturbation
51 Figure B.2 – Binary symmetric channel (BSC)
52 Figure B.3 – Example of a block with message and CRC bits (redundancy code)
Figure B.4 – Block codes for error detection
53 Figure B.5 – Proper and improper CRC polynomials
Table B.1 – Example dependency dmin and block length n
55 Annex C (informative) Structure of technology-specific parts
Table C.1 – Common subclause structure for technology-specific parts
57 Annex D (informative) Assessment guideline
59 Figure D.1 – Basic Markov model
62 Bibliography

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BS EN 61784-3:2010
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