1. Understand the difference
OT prioritises safety and uptime over confidentiality, runs legacy systems and cannot always be patched on demand. Testing must be OT-safe.
2. Segment with zones and conduits
IEC 62443 structures the environment into zones and conduits, each assigned a target Security Level based on the threat it must resist.
3. The foundations
- Asset inventory and network mapping.
- Segmentation between IT and OT.
- Monitoring, careful patching and incident response.
How CyberSigma helps
We assess OT/ICS environments against IEC 62443 — zone/conduit design, security levels and OT-safe testing — to secure operations without downtime.
This guide is educational and not legal advice. Requirements evolve — validate specifics against the current standard or regulation for your situation.