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BS EN 61784-3-17:2017:2019 Edition

BS EN 61784-3-17:2017:2019 Edition

$215.11

Industrial communication networks. Profiles – Functional safety fieldbuses. Additional specifications for CPF 17

Published By Publication Date Number of Pages
BSI 2019 78
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This part of the IEC 61784-3 series specifies a safety communication layer (services and protocol) based on CPF 17 of IEC 61784-2 (CP 17/1) and IEC 61158 Type 21. 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 is related to hazards such as electrical shock. Intrinsic safety is related to hazards associated with potentially explosive atmospheres.

This part 1 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 series2 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 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 for it to qualify as a safety device.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
10 FOREWORD
12 Figures
Figure 1 – Relationships of IEC 617843 with other standards (machinery)
13 Figure 2 – Relationships of IEC 617843 with other standards (process)
15 1 Scope
2 Normative references
16 3 Terms, definitions, symbols, abbreviated terms, and conventions
3.1 Terms and definitions
3.1.1 Common terms and definitions
22 3.1.2 CPF 17: Additional terms and definitions
3.2 Symbols and abbreviated terms
3.2.1 Common symbols and abbreviated terms
23 3.2.2 CPF 17: Additional symbols and abbreviated terms
3.3 Conventions
4 Overview of FSCP 17/1 (RAPIEnet Safety™)
24 Figure 3 – Communication relationships among FSCP 17 devices
25 5 General
5.1 External documents providing specifications for the profile
5.2 Safety functional requirements
5.3 Safety measures
5.3.1 General
26 5.3.2 (Virtual) sequence number
5.3.3 Time expectation with watchdog
5.3.4 Connection authentication
5.3.5 Feedback message
5.3.6 Data integrity assurance
Tables
Table 1 – Deployed measures to manage errors
27 5.4 Safety communication layer structure
5.4.1 Principle of FSCP 17/1 safety communications
5.4.2 CPF 17 communication structures
5.5 Relationships with FAL (and DLL, PhL)
5.5.1 General
Figure 4 – Safety layer architecture
28 5.5.2 Data types
6 Safety communication layer services
6.1 Overview
6.2 Functional Safety connection
6.2.1 General
6.2.2 Initiator class specification
29 6.2.3 Responder-class specification
30 6.2.4 Sender class specification
32 6.2.5 Receiver class specification
34 6.3 Functional Safety data transmission service
6.4 Functional Safety connection relation
Figure 5 – Functional Safety Cycle
35 7 Safety communication layer protocol
7.1 Safety PDU format
7.1.1 General
Figure 6 – Connection relationships among FSCP 17/1 devices
Figure 7 – Functional Safety PDU for CPF 17 over type 21 PDU
36 7.1.2 FSPDU command
7.1.3 Authentication key
7.1.4 FSPDU CRC
Table 2 – General FSPDU
Table 3 – FSPDU command
37 Figure 8 – FSPDU CRC code generation process
38 Figure 9 – Example of sequence number changing
39 7.2 FSCP 17/1 communication procedure
7.2.1 FSCP 17/1 device states
Figure 10 – CRC comparison operation
40 Figure 11 – FSCP 17/1 device states
41 Table 4 – FSPDU with 4 octets of safety data and RESET command after restart (reset connection) or error
Table 5 – FSPDU with 4 octets of safety data and RESET commandto acknowledge a reset command from the Initiator
42 Table 6 – Connection request PDU for the Initiator in CONNECTION state
Table 7 – Connection response PDU for the Responder in CONNECTION state
43 Table 8 – Safety data transferred in the SET_PARA state
Table 9 – Sending FSPDU with 6 octets of safety data from the Initiator in SET_PARA state
44 Table 10 – Expected FSPDU with 6 octets of safety data from the Responder in SET_PARA state
Table 11 – Safety data from the Initiator in the WAIT_PARA state
45 Table 12 – Sending FSPDU with 6 octets of safety data from the Initiator in the WAIT_PARA state
Table 13 – Receiving FSPDU with 6 octets of safety data from the Responder in the WAIT_PARA state
46 Table 14 – FSPDU of Safety data in the DATA state
Table 15 – Example of 4 octets of safety data from a Sender
Table 16 – Example of ACK PDU from the Receiver with 4 octets of safety data
47 7.3 Response to communication errors
7.3.1 General
7.4 State table for SCL of CPF 17
7.4.1 General
Table 17 – Functional Safety communication errors
Table 18 – Functional Safety communication error codes
48 7.4.2 Events
Figure 12 – State diagram for Functional Safety device
Table 19 – States of the Functional Safety Initiator
Table 20 – States of the Functional Safety Responder
49 7.4.3 State table for Initiator
Figure 13 – State diagram for Initiator
Table 21 – Events in the Functional Safety state
58 7.4.4 State table for Responder
Figure 14 – State diagram for Responder
67 8 Safety communication layer management
8.1 FSCP 17/1 parameter handling
8.2 Functional Safety communication parameters
9 System requirements
9.1 Indicators and switches
9.2 Installation guidelines
9.3 Safety function response time
Table 22 – Functional Safety communication parameters
68 Figure 15 – Safety function response time
70 9.4 Duration of demands
9.5 Constraints for calculation of system characteristics
9.5.1 General
9.5.2 Number of devices
9.5.3 Probabilistic consideration
71 9.6 Maintenance
9.7 Safety manual
10 Assessment
Figure 16 – Residual error rate of FSCP 17/1
72 Annex A (informative) Additional information for functional safety communication profiles of CPF 17
A.1 Hash function calculation
73 A.2 …
Table A.1 – the lookup table for FSCP 17/1
74 Annex B (informative) Information for assessment of the functional safety communication profiles of CPF 17
75 Bibliography

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BS EN 61784-3-17:2017
$215.11