SIST EN IEC 61784-2-20:2023 PDF

Overview

EN IEC 61784-2-20:2023 (IEC 61784-2-20:2023) defines Communication Profile Family 20 (CPF 20) - a set of additional Real‑Time Ethernet (RTE) communication profiles based on ISO/IEC/IEEE 8802-3 (Ethernet) and the IEC 61158 series (Type 25). CPF 20 (also referred to as ADS‑net in the document) specifies RTE communication profiles (CP 20/1, CP 20/2), the related network components, and the RTE performance indicators and their dependencies required for real‑time fieldbus applications.

Key Topics

• Scope and structure of CPF 20: profiles, physical, data‑link and application layer selections for CP 20/1 and CP 20/2.
• Real‑Time Ethernet (RTE) profiles built on Ethernet (ISO/IEC/IEEE 8802‑3) and IEC 61158 Type 25 elements.
• Performance indicators: delivery time, RTE throughput, non‑RTE bandwidth and dependency matrices used to select consistent performance sets.
• Protocol and service selection at each layer (DLL/AL) and mapping for deterministic behavior (e.g., VLAN priority considerations).
• Annex A: informative guidance for performance‑indicator calculation (delivery time, throughput, non‑RTE bandwidth).
• Normative references to IEEE 802.1 standards (AS, Q, 802.1AB) and core Internet protocols (TCP/UDP/IP) for interoperability and time synchronization.

Applications

EN IEC 61784-2-20:2023 is intended for:

• Industrial automation and process control systems requiring deterministic Ethernet transport.
• System integrators and network architects designing time‑sensitive networks for factories, process plants, and critical infrastructure.
• Device and component manufacturers implementing RTE network interfaces compliant with CPF 20 (physical, data‑link, application layer requirements).
• Test labs and certification bodies performing conformance, interoperability and performance testing using the specified performance indicators and calculation methods.
• Network planners optimizing bandwidth allocation between RTE and non‑RTE traffic and configuring VLAN priority mappings.

Practical value: the standard helps ensure deterministic behavior over Ethernet, guides selection of protocol stacks and network components, and provides measurable KPI definitions for predictable real‑time performance.

Related Standards

• IEC 61158 series (Fieldbus specification, Type 25)
• IEC 61784-1 (profiles framework)
• ISO/IEC/IEEE 8802‑3 (Ethernet)
• IEEE 802.1AS (time synchronization), 802.1Q (bridging/VLANs), 802.1AB (LLDP)
• IETF RFCs for TCP/UDP/IP/ICMP

For implementers and procurement teams, EN IEC 61784-2-20:2023 / CPF 20 is a practical reference for deploying compliant, deterministic Real‑Time Ethernet solutions in industrial environments.