IEC 61784 3-6:2010 specifies a safety communication layer (services and protocol) based on CPF 6 of IEC 61784-1, IEC 61784-2 and IEC 61158 Type 8. It identifies the principles for functional safety communications defined in IEC 61784-3 that are relevant for this safety communication layer. 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 second edition cancels and replaces the first edition published in 2007. It constitutes a technical revision. The main changes with respect to the previous edition are: updates in relation with changes in IEC 61784 3. This bilingual version published in 2011-11, corresponds to the English version published in 2010-07.

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9	CONTENTS
14	0 Introduction 0.1 General Figures Figure 1 – Relationships of IEC 61784-3 with other standards (machinery)
15	Figure 2 – Relationships of IEC 61784-3 with other standards (process)
16	0.2 Patent declaration
17	1 Scope 2 Normative references
18	3 Terms, definitions, symbols, abbreviated terms and conventions 3.1 Terms and definitions
23	3.2 Symbols and abbreviated terms
25	3.3 Conventions 4 Overview of FSCP 6/7 (INTERBUS™ Safety) 4.1 General 4.2 Technical overview
26	4.3 Functional Safety Communication Profile 6/7 Figure 3 – FSCP 6/7 communication preconditions
27	5 General 5.1 External documents providing specifications for the profile 5.2 Safety functional requirements 5.3 Safety measures Tables Table 1 – Overview of profile identifier usable for FSCP 6/7
28	Table 2 – Selection of the various measures for possible errors
29	5.4 Safety communication layer structure
30	Figure 4 – Example of a safety function
31	Figure 5 – Decomposition of safety function into function blocks
32	Table 3 – List of function blocks and subsystems
33	Figure 6 – Overview of the results of the decomposition process Figure 7 – Signal flow between the function blocks
34	Figure 8 – Interfaces between the safety devices within the safety communication system Table 4 – Signal flow between the function blocks
36	Figure 9 – Signal flow and safe states
38	5.5 Relationships with FAL (and DLL, PhL) Figure 10 – Mapping of the Safe Transmission function block
39	Figure 11 – Relationship between SCL and the other layers of IEC 61158 Type 8
40	Figure 12 – Use of the AR-US service to initiate and parameterize Figure 13 – Use of the AR-US service to transmit safety data
41	6 Safety communication layer services 6.1 General 6.2 Transmission principle for safety messages between SCLM and SCLS Figure 14 – Use of the AR-US service to abort Figure 15 – Use of the AR-US service to abort
42	6.3 Function block requirements
43	6.4 Context management Table 5 – Initiate service parameters
44	Table 6 – Parameterization mode and related services Table 7 – Abort service parameters
45	6.5 Function block parameterization Table 8 – Abort of a point-to-point connection by the SRP or SRC Table 9 – Send application parameter service
46	Table 10 – Send application parameter ID service
47	6.6 Safe Process Data Mode Table 11 – Parameterize device parameters
48	Table 12 – Transmit-Safety-Data service parameters
49	Table 13 – Set-Diagnostic-Data service parameters
50	7 Safety communication layer protocol 7.1 Safety PDU format Figure 16 – Structure of the safety PDU Table 14 – Set-Acknowledgement-Data service parameters
51	Figure 17 – Integration of safety data and deterministic remedial measures in the summation frame
52	Figure 18 – Write_Parameter_Byte_Req message Figure 19 – Read_Parameter_Byte_Req message Figure 20 – Parameter_Byte_Con message
53	Table 15 – Parameter ID Table 16 – Block 0: Device ID
54	Table 17 – Block 1: Parameter record ID
55	Figure 21 – Set_Safety_Connection_ID_Req message Figure 22 – Set_Safety_Connection_ID_Con message of safety slaves Table 18 – Block 2: Application parameter
56	Figure 23 – Parameter_Idle_Req Figure 24 – Parameter_Idle_Con Figure 25 – Parameter_Check_Con Figure 26 – Parameter_Loc_ID_Changed_Con
57	Figure 27 – Transmit Safety Data Message Table 19 – TIME encoding
58	Figure 28 – Sync_a message of the SCLM Figure 29 – Req_b message of the SCLM Figure 30 – Req_c message of the SCLM
59	7.2 State description Figure 31 – Req_d message of the SCLM Figure 32 – Abort_Connection message Figure 33 – Safety-Slave_Error message
60	Figure 34 – SCLM state machine Figure 35 – SCLS state machine
61	Figure 36 – Initiate sequence
63	Figure 37 – Send Application Parameter sequence
64	Figure 38 – Send Application Parameter ID sequence
65	Figure 39 – Parameterize device sequence
66	Figure 40 – Simultaneous transmission of safety data to the safety slaves
67	Figure 41 – Use of the sequence number in the SCLM and SCLS
68	Figure 42 – Startup and error-free operation
69	Figure 43 – Resynchronization during operation
70	Figure 44 – Invalid CRC 24 checksum detected by the SCLS
71	Figure 45 – Process data mode with diagnostic data transmission
72	7.3 Abort Figure 46 – Process data mode with Acknowledgement-Data transmission
73	Figure 47 – Error when initiating a connection Table 20 – Abort_Info: Connection abort in the event of an error detected by the SCLM
74	Figure 48 – Error at an SCLS when aborting all connections Table 21 – Abort_Info: Abort of all connections in the event of an error detected by the SCLS
75	Figure 49 – Abort of all connections in the event of an error detected by the SCLM
76	8 Safety communication layer management 8.1 General 8.2 Requirements of safety communication layer management 8.3 Set-Safety-Configuration service Table 22 – Abort_Info: Abort of all connections in the event of an error detected by the SCLM
77	Table 23 – Set-Safety-Configuration service Table 24 – Error_Info
78	8.4 Start IEC 61158 Type 8 service 9 System requirements 9.1 Indicators and switches 9.2 Installation guidelines 9.3 Safety function response time
80	Figure 50 – Overview of the shutdown time
82	Table 25 – Calculation of tIB
83	9.4 Duration of demands 9.5 Constraints for calculation of system characteristics Table 26 – Calculation of tSRC Table 27 – Calculation of tPST
84	9.6 Maintenance
85	9.7 Safety manual 10 Assessment
86	Annex A (informative) Additional information for functional safety communication profiles of CPF 6
87	Annex B (informative) Information for assessment of the functional safety communication profiles of CPF 6
88	Bibliography

Published By	Publication Date	Number of Pages
BSI	2010	92


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Status	Definitive
Pages	92
Publication Date	2010-09-30
ISBN	978 0 580 72030 7
Standard Number	BS EN 61784-3-6:2010
Title	Industrial communication networks. Profiles – Functional safety fieldbuses. Additional specifications for CPF 6
Identical National Standard Of	EN 61784-3-6:2010, IEC 61784-3-6:2010
Replaces	BS EN 61784-3-6:2008
Descriptors	Data transmission, Bus networks, Industrial, Fieldbus, Data transfer, Open systems interconnection, Safety, Process control, Data processing, Computer networks, Data link layer (OSI), Interfaces (data processing), Automatic control systems, Communication networks
Publisher	BSI
Committee	GEL/65/3
ICS Codes	35.100.05 - Multilayer applications

BS EN 61784-3-6:2010

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