19 min read
IEC 62443-4-2 Primer — A Map of FR1-7 and Component Requirements
A primer map for anyone new to IEC 62443-4-2. Covers why the 62443 series is divided by audience rather than topic, the four faces of SL and the three faces of SL 0, the Component Requirements (CR) of the seven Foundational Requirements (FR1-7), the SAR/EDR/HDR/NDR component types, and the distinctly industrial-security idea of "maintain degraded mode instead of preventing DoS."
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