Overview
IEC 61784-2:2007 - Industrial communication networks – Profiles – Part 2 - defines additional fieldbus profiles for Real‑Time Ethernet (RTE) systems based on ISO/IEC 8802-3. It specifies performance indicators, profile families (CPFs) and related network component mappings for RTE solutions that operate in parallel with standard Ethernet (ISO/IEC 8802-3) applications. The edition (2007-12, bilingual release 2014-11) complements IEC 61784‑1 and the IEC 61158 series by documenting profile behaviour, conformance testing and performance criteria for industrial real‑time networks.
Key topics and technical requirements
- RTE performance indicators - metrics used to classify and compare RTE solutions, including:
- delivery time
- number of RTE end‑stations
- basic network topology and number of switches between end‑stations
- throughput and non‑RTE bandwidth
- time synchronization and non‑time‑based synchronization accuracy
- redundancy recovery time
- Communication Profile Families (CPFs) - detailed profile definitions and mappings for multiple RTE technologies (examples in the standard):
- CPF 2 (CIP), CPF 3 (PROFIBUS & PROFINET), CPF 4 (P‑NET), CPF 6 (INTERBUS), CPF 10 (Vnet/IP), CPF 11 (TCnet), CPF 12 (EtherCAT), CPF 13 (ETHERNET Powerlink), CPF 14 (EPA)
- Layer mappings - physical layer, data link layer and application layer requirements and behaviour for each profile.
- Conformance testing - methodology, test conditions, procedures, measurement and reporting to verify that implementations meet profile and performance requirements.
- Classification and node/application classes - node capabilities, communication/redundancy/media classes and conformance behaviours for interoperable deployments.
Applications and who uses it
IEC 61784-2 is practical for:
- Device manufacturers designing industrial Ethernet interfaces (PLCs, I/O modules, drives) to meet RTE profile requirements.
- System integrators and network designers selecting appropriate RTE profiles for machine control, motion control, and factory automation.
- Test labs and certification bodies executing conformance tests and performance verification against standard criteria.
- Procurement and engineering teams specifying deterministic Ethernet behaviour, synchronization and redundancy targets for industrial projects.
Real‑world use cases include high‑performance motion control, synchronized distributed I/O, safety‑relevant networks and mixed traffic environments where real‑time and standard Ethernet applications run in parallel.
Related standards
Keywords: IEC 61784-2, Real‑Time Ethernet, RTE, fieldbus profiles, ISO/IEC 8802-3, conformance tests, EtherCAT, PROFINET, Ethernet Powerlink, industrial communication networks.
