Overview
EN ISO 25119-4:2023/A1:2023 is the CEN-adopted amendment to ISO 25119‑4, covering safety‑related parts of control systems for tractors and machinery used in agriculture and forestry. Part 4 addresses requirements for the production, operation, modification and supporting processes that assure safety throughout the lifecycle of control-system components. Amendment A1 updates normative references and aligns Part 4 with revisions and corrigenda in other parts of the ISO 25119 series. The amendment was approved by CEN on 9 January 2023 and is published in English, French and German.
Key topics and requirements
- Scope: management of processes that affect the safety behaviour of safety‑related parts of control systems during manufacturing, commissioning, operation, modification and servicing.
- Lifecycle focus: requirements to maintain safety integrity of control-system parts across production and in‑service modifications and supporting processes.
- Normative reference updates: A1 replaces multiple references throughout the standard to incorporate:
- Consistency: the amendment ensures cross‑part consistency in terminology, referenced lifecycle processes and compliance pathways.
- Compliance implications: national adoption required (endorsement or identical text) and withdrawal of conflicting national standards by March 2024.
Applications and who uses it
- Manufacturers and OEMs of tractors and agricultural/forestry machinery - to control production and modification processes affecting functional safety.
- Suppliers of safety‑related control components and electronic control units (ECUs) - to align manufacturing and testing processes with lifecycle safety requirements.
- Safety engineers, quality and compliance teams - to develop procedures for commissioning, maintenance and authorized modification while preserving safety integrity.
- Test laboratories, certification bodies and conformity assessors - to interpret normative references and verify compliance with the amended series.
- Aftermarket service and maintenance organizations - to apply safe modification and supporting process controls.
Related standards
- ISO 25119 series (Parts 1–3 and Part 4): the amendment explicitly updates references to Parts 1, 2 and 3 (including their amendments).
- Applicable EU directives/regulations: the document supports essential requirements and includes informative Annex ZA for relationship with EU law.
Keywords: EN ISO 25119-4:2023/A1:2023, ISO 25119‑4 amendment, tractors safety, agricultural machinery control systems, safety‑related parts, production operation modification, functional safety, CEN adoption.