This part of IEC 61784-3 (all parts) specifies a safety communication layer (services and protocol) based on CPF 8 of IEC 61784-1, IEC 61784-2 and IEC 61158 Type 18 and Type 23. 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.dition 3.0 2021-05 INTERNATIONAL STANDARD NORME INTERNATIONALE colour inside Industrial communication networks – Profiles – Part 3-8: Functional safety fieldbuses – Additional specifications for CPF 8 Réseaux de communication industriels – Profils – Partie 3-8: Bus de terrain de sécurité fonctionnelle – Spécifications supplémentaires pour CPF 8 IEC 61784-3-8:2021-05(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？