TÜV Rheinland Updates PLd Certification: EMC Immunity Now Mandatory for Servo Drives

On April 26, 2026, TÜV Rheinland released Revision 2026.4 of its Implementation Rules for PLd-Level Functional Safety Certification, mandating EN IEC 61000-6-2:2024 immunity testing for servo drives, motion controllers, and robotic joint modules seeking PLd certification. This change directly affects manufacturers and exporters targeting EU industrial automation markets—particularly those supplying machinery requiring Category 3 / PLd safety integrity under ISO 13849-1.

Event Overview

On April 26, 2026, TÜV Rheinland issued Implementation Rules for PLd-Level Functional Safety Certification (Rev. 2026.4). The revision stipulates that all applications for PLd-level certification of servo drives, motion controllers, and industrial robot joint modules must now include successful test reports for EN IEC 61000-6-2:2024 immunity testing—including Electrical Fast Transient (EFT), Surge, and Conducted Susceptibility (CS) test scenarios—in addition to the existing IEC 61800-5-2 functional safety evaluation. The requirement entered into force immediately, with a 30-day transition period ending on May 26, 2026.

Industries Affected by the Update

Export-Oriented Drive & Motion Control Manufacturers

These companies are directly impacted because PLd certification is often contractually required for OEMs integrating drives into CE-marked machinery. Failure to pass the new immunity tests will result in non-issuance of PLd certificates—even if functional safety compliance is otherwise demonstrated—potentially delaying or blocking market access to the EU.

OEMs Integrating Servo Systems into Safety-Critical Machinery

OEMs building packaging lines, automated assembly cells, or collaborative robot systems rely on certified subcomponents to fulfill their own ISO 13849-1 or IEC 62061 safety architecture claims. A supplier’s inability to provide valid PLd certificates under Rev. 2026.4 may necessitate redesigning safety validation pathways or requalifying alternative components.

Third-Party Test Laboratories & Certification Bodies

Laboratories accredited for IEC 61800-5-2 testing must now verify their scope includes EN IEC 61000-6-2:2024 immunity testing—specifically EFT, Surge, and CS—with appropriate test setups, calibration records, and personnel competency. Certification bodies must update audit checklists and review procedures accordingly before May 26, 2026.

What Relevant Enterprises or Practitioners Should Focus On and How to Respond

Verify current certification status against Rev. 2026.4 requirements

Manufacturers holding active PLd certificates issued prior to April 26, 2026 should confirm whether those certificates remain valid for new deliveries post-transition period. Certificates issued under earlier revisions do not automatically cover the new immunity requirement; re-evaluation may be needed for new production lots or updated firmware versions.

Prioritize immunity testing for products already in certification pipeline

For products undergoing PLd assessment as of April 26, 2026, applicants must submit EN IEC 61000-6-2:2024 test reports before TÜV Rheinland completes final review. Delays in arranging immunity testing—especially given lab capacity constraints for EFT/Surge/CS—may extend time-to-certification beyond the 30-day window.

Review technical documentation and safety manuals for alignment

The new immunity requirement implies stricter environmental robustness expectations. Product datasheets, installation manuals, and safety instructions may need updates to reflect operating conditions validated under EN IEC 61000-6-2:2024—particularly regarding grounding, cable routing, and power supply filtering recommendations.

Confirm supplier declarations and subcomponent traceability

For drive manufacturers using third-party ICs, gate drivers, or power modules, immunity performance depends on full system-level integration. Suppliers’ immunity claims alone are insufficient; system-level EFT/Surge/CS test evidence must be available and traceable to specific hardware/firmware configurations.

Editorial Perspective / Industry Observation

From an industry perspective, this update signals a tightening convergence between functional safety and electromagnetic compatibility—not as parallel requirements, but as interdependent validation layers. Analysis suggests TÜV Rheinland is responding to field-reported safety-related malfunctions linked to transient-induced control faults, rather than introducing a novel concept. Observation shows the revision does not raise the PLd performance level itself, but raises the evidentiary bar for claiming it under real-world electrical stress conditions. It is better understood as an enforcement refinement than a paradigm shift—and one likely to be mirrored by other Notified Bodies in upcoming revisions of harmonized standards application guidance.

Conclusion: This update formalizes an operational prerequisite for PLd certification in the EU industrial automation sector. It reflects an evolving expectation that safety-critical motion components demonstrate resilience not only in fault-handling logic, but also in analog and power-stage behavior under electromagnetic disturbance. For affected stakeholders, the change is neither speculative nor distant—it is effective immediately, with narrow transition timing, and requires concrete, system-level verification—not just documentation updates.

Source: TÜV Rheinland, Implementation Rules for PLd-Level Functional Safety Certification (Rev. 2026.4), published April 26, 2026. Further official clarifications—such as applicability to legacy product variants or multi-certification bundles—are pending and require ongoing monitoring.