IEC 61784-3-19-2024 PDF

Full title and description

St IEC 61784-3-19-2024 — Industrial communication networks — Profiles — Part 3‑19: Functional safety fieldbuses — Additional specifications for CPF 19. This standard defines a safety communication layer (services and protocol) for CPF 19, building on the general profile rules and on the underlying IEC 61158 protocol types; it provides mechanisms, implementation guidance and assessor guidance for transmission of safety‑relevant messages in distributed fieldbus networks intended for safety devices.

Abstract

IEC 61784-3-19:2024 specifies supplementary requirements for the CPF 19 family of functional safety communication profiles. It describes the safety communication services and protocol mapping (based on IEC 61784‑1‑19, IEC 61784‑2‑19 and the IEC 61158 series, Type 24 and Type 27), identifies principles relevant to functional safety communications and gives guidelines for developers and assessors of compliant devices and systems. The document focuses on ensuring safe transmission of safety‑relevant messages in industrial applications (process control, manufacturing automation, machinery) in accordance with IEC 61508 requirements; it is intended for implementation in safety devices and does not itself address electrical/intrinsic safety aspects.

General information

• Status: International Standard (published / current).
• Publication date: 15 October 2024 (IEC edition 1.0).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 25.040.40 (Industrial process measurement and control) — 35.100.05 (Multilayer applications).
• Edition / version: 1.0 (first edition, 2024).
• Number of pages: 155 (IEC webstore PDF file size listing).

Scope

This part of IEC 61784 specifies a safety communication layer for CPF 19: it defines services, protocols and transmission mechanisms for safety‑relevant messages between participants in a distributed fieldbus network. The scope covers protocol mapping to the relevant IEC 61158 types and the principles from IEC 61784‑3 that apply to the CPF 19 safety layer. The standard is intended for implementation in devices that perform safety functions; it does not address electrical safety or intrinsic safety of equipment. The guidance is applicable across process control, manufacturing automation and machinery domains and is intended both for implementers and for assessors who evaluate compliance and claim SIL levels.

Key topics and requirements

• Definition of a safety communication layer (services, protocol behavior) specific to CPF 19.
• Mapping and integration with IEC 61158 protocol types (Type 24 and Type 27) and related IEC 61784 parts.
• Mechanisms for transmission of safety‑relevant messages (timing, diagnostics, error handling and data integrity requirements).
• Requirements and recommendations for implementation in safety devices (design considerations that affect SIL claims).
• Guidance for developers and assessors on demonstrating conformance to functional safety requirements (testing, documentation and assessor considerations).
• Interoperability and profile conformance rules for CPF 19 implementations.

Typical use and users

Typical users include device and equipment manufacturers implementing safety functions over CPF 19, system integrators building safety‑instrumented systems, test laboratories and certification/assessment bodies evaluating SIL claims, and standards engineers who map application requirements to functional safety communication profiles. The standard is used when designing or assessing fieldbus‑based safety communications in process and factory automation projects.

Related standards

Directly related documents include IEC 61784‑1‑19 and IEC 61784‑2‑19 (profile rules and profile definitions for CPF 19), the IEC 61158 series (protocol type definitions, notably Type 24 and Type 27 referenced for CPF 19 mapping) and the IEC 61508 series (functional safety lifecycle and SIL definitions). Regional/adopted versions exist as EN/ national adoptions (EN IEC 61784‑3‑19 / national standards bodies).

Keywords

CPF 19, functional safety, fieldbus, safety communication layer, IEC 61784, IEC 61158, SIL, safety protocol, conformance, safety devices

FAQ

Q: What is this standard?

A: IEC 61784‑3‑19:2024 is a part of the IEC 61784 series that specifies additional functional safety fieldbus requirements for the CPF 19 communication profile family — defining a safety communication layer (services and protocol) intended for implementation in safety devices.

Q: What does it cover?

A: It covers the definition of safety communication services and protocol mapping (based on IEC 61784‑1‑19 / IEC 61784‑2‑19 and IEC 61158 Types 24 and 27), mechanisms for transmission of safety‑relevant messages, implementation guidance for safety devices and guidance for assessors. It does not cover electrical or intrinsic safety hardware aspects.

Q: Who typically uses it?

A: Device manufacturers, system integrators, safety assessors and test laboratories working with fieldbus‑based safety systems in process, discrete manufacturing and machinery sectors.

Q: Is it current or superseded?

A: The document is the first edition published in 2024 and is current; national and regional adoptions (EN/national versions) have been published/ratified following the IEC release. Check national standards bodies for adoption dates and local publication references.

Q: Is it part of a series?

A: Yes — it is part of the IEC 61784 series ("Industrial communication networks — Profiles") and specifically extends the Part 3 family (functional safety fieldbuses) with CPF 19 supplementary specifications; it references and works together with IEC 61158 and the IEC 61508 safety lifecycle requirements.

Q: What are the key keywords?

A: CPF 19, functional safety, fieldbus, safety protocol, IEC 61784, IEC 61158, SIL, conformance, safety devices, assessor guidance