Checklist for the E27 onboard-system requirements: secure-by-design, authentication, patching, monitoring, supplier assurance.
Formula
$$ \text{E27 score} = \sum \text{Controls met} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Controls$ | Five E27 pillars | - | IACS UR E27 |
Sources
- IACS UR E27.
- IEC 62443 - Industrial automation & control systems security.