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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN IEC 61784-3-3
Industrial communication networks. Profiles -- Functional safety fieldbuses. Additional specifications for CPF 3
This part of the IEC 61784-3 series specifies a safety communication layer (services and protocol) based on CPF 3 of IEC 61784-1, IEC 61784-2 (CP 3/1, CP 3/2, CP 3/4, CP 3/5 and CP 3/6) and IEC 61158 Types 3 and 10. 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 relates to hazards such as electrical shock. Intrinsic safety relates 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:
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.
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