IEC 61784-5-3:2018

Overview

IEC 61784-5-3:2018 defines installation profiles for CPF 3 (PROFIBUS/PROFINET) and specifies how the communication profiles in this family are to be installed and verified. This fourth edition (2018) is a technical revision that replaces the 2013 edition. The standard provides annexed installation profiles read in conjunction with IEC 61918 and documents which IEC 61918 requirements fully apply, and where they are supplemented, modified or replaced.

Key updates in the 2018 edition include:

• Addition of 4‑pair cabling support
• Addition of M12 X‑Coding connector guidance
• Definition of End‑to‑end links
• Revisions to key installation tables and a formula for NEXT (near‑end crosstalk) limits on end‑to‑end links

Key topics and requirements

• Scope and structure: Installation profiles for CPF 3 are provided in normative annexes covering CP 3/1, CP 3/2 (PROFIBUS) and CP 3/3–3/6 (PROFINET).
• Installation planning: Network capabilities, topology recommendations, cabling selection, and planning documentation requirements.
• Cabling components: Requirements for cable types (including 4‑pair copper and optical fibre options), shields, connectors (including M12 X‑Coding), terminators and connector pin assignments.
• Earthing and bonding: Recommended shielding and earthing practices for field devices and cables to minimize noise and ensure EMC compliance.
• End‑to‑end links: Definition and measurement/verification methods for assembled links; guidance on crosstalk (NEXT) limits and formulas for compliance.
• Verification and acceptance testing: Resistance and continuity tests, dedicated test circuits, installation acceptance procedures and documentation of “as‑implemented” cabling.
• Conformance and maintenance: Procedures for demonstrating conformance to profiles, administration, troubleshooting and lifecycle maintenance recommendations.

Practical applications and users

This standard is essential for:

• Industrial network designers and system integrators deploying PROFIBUS or PROFINET fieldbus systems
• Electrical and instrumentation installers performing cabling, connectorization and earthing
• Plant engineers and maintenance teams responsible for network acceptance testing, troubleshooting and documentation
• Certification bodies and inspectors verifying installation conformance to CPF 3 profiles

Use cases include factory automation networks, process control installations and machine-level I/O networks where deterministic, reliable fieldbus communications are required.

Related standards

• IEC 61918 - Communication profiles referenced by this installation profile
• Other parts of IEC 61784 (Profiles series) for alternate CPF families and profile definitions

Keywords: IEC 61784-5-3, CPF 3, PROFIBUS, PROFINET, installation profiles, fieldbus installation, M12 X‑Coding, 4‑pair cabling, end‑to‑end link, NEXT, cabling verification.