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implementing-iec-62443-security-zones

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'Designs security zones and conduits for industrial control systems

When to use

• When designing a greenfield OT network architecture for a new industrial facility
• When retrofitting security zones into an existing flat OT network after an assessment finding
• When implementing network segmentation to comply with IEC 62443-3-2 certification requirements
• When upgrading from basic VLAN segmentation to policy-enforced zone/conduit architecture
• When an IT/OT convergence project requires defining security boundaries between enterprise and operational networks

When not to use

• IT-only network segmentation
• cloud-native workload segmentation
• physical security zone design without a cyber component

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