FR 7 — Resource Availability (RA)

    IEC 62443 FR 7 — Resource Availability (RA): how QuantLayer keeps systems resilient with OT-safe enforcement and audit-ready evidence.

    IEC 62443
    FR 7
    OT/ICS
    6 min
    Last updated: 2026-01-22

    Overview

    Maintain system availability and resilience; withstand DoS conditions and support safe recovery.

    QuantLayer control mapping

    • Staged enforcement modes and safe rollback
    • Rate-limit and anomaly signals for suspicious behavior
    • Resilient policy distribution for edge/remote sites
    • Operational guardrails for high-availability zones

    Implementation steps

    • Scope by zone: identify where this FR is most critical (e.g., safety zone, engineering access, remote vendor conduit).
    • Start in observe mode: baseline behavior and identify necessary exceptions.
    • Enforce gradually: enable controls in phases aligned to maintenance windows; document exceptions.
    • Continuously verify: monitor drift and anomalies; automate response where safe.

    Evidence checklist

    • Availability posture by zone
    • Enforcement mode history and rollback records
    • Anomaly/DoS signal logs and mitigations
    Implementation note
    IEC 62443 compliance is achieved through a combination of people, process, and technology controls. QuantLayer helps you operationalize the technical controls (identity, segmentation, integrity, telemetry, response) while producing audit-ready evidence to support your CSMS and assurance activities.