20 Sep 2026

IEC 62443 Becomes the Common Language of OT Security

Tags

  • IEC 62443
  • OT Security
  • Zones and Conduits
  • Security Levels
  • NIST SP 800-82

ISA/IEC 62443 is increasingly the reference point regardless of jurisdiction. In Europe, standards bodies drafting harmonised standards for the Cyber Resilience Act are looking to it as the technical baseline. In the United States, the Operational Technology Cybersecurity Coalition published a position paper in July 2026 urging federal recognition of 62443 to reduce regulatory fragmentation, and NIST SP 800-82r3 cross-references it.

The standard continues to evolve. The organisation-wide management requirements in IEC 62443-2-1 were updated in 2025, and additional parts addressing IIoT and security evaluation are reported to be under way, though details should be confirmed against ISA and IEC sources.

The commercial pressure is real. Cyber insurers are asking for evidence of zone and conduit segmentation and defined security level targets before renewal, and customers are beginning to ask suppliers for 62443 certification in tenders.

We structure new control system designs around zones, conduits and target security levels from the first network drawing, which makes later audits and insurer questionnaires far easier to answer.

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