ISASecure and IEC 62443, explained with the numbers
What each certification program actually evaluates, how the security levels and device types change the scope, and where the common points of confusion come from — written by the assessors who run these evaluations.
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After the certificate: ACSSA surveillance in years one and two, recertification in year three
How an ISASecure ACSSA certificate stays valid: 36 months, surveillance in years one and two, recertification in year three, nonconformities and suspension.
IEC 62443-2-1 audit evidence in an ACSSA evaluation: documents, interviews and inspection, never testing
How an ISASecure ACSSA evaluator gathers evidence on an installed IACS: documents, interviews and configuration inspection, never testing or device access.
The ACSSA assessment process: four phases and the report you receive
How an ISASecure ACSSA evaluation runs: the plan you approve, the four ACSSA-304 phases from risk assessment to report, and how to read the ACSSA-303 report.
An asset owner's installed IACS: IEC 62443 asset owner certification scope under ISASecure ACSSA, and the six documents that define it
ISASecure ACSSA certifies an asset owner's installed IACS, bounded by six change-controlled documents: who may apply, what is in scope and what is carved out.
IEC 62443-2-1 maturity level 2 vs 3: why ISASecure ACSSA certification needs level 3 on every requirement
In ISASecure ACSSA, maturity level 2 means a requirement is documented and level 3 means it is practised. Certification needs level 3 on every requirement.
IEC 62443 target security levels in ACSSA: the asset owner's level decides what is checked, and nothing is awarded
How ACSSA uses each zone's target security level from the asset owner's IEC 62443-3-2 risk assessment to decide what is checked, and why no level is awarded.
Service providers in ACSSA: IEC 62443-2-4, delegated tasks and the VIC shortcut
How ISASecure ACSSA evaluates an asset owner's service providers against IEC 62443-2-4: who counts, delegated tasks, the agreed list, NR-A and the VIC result.
ACSSA evaluation results: ten result types, and the one that fails
ACSSA records ten result types across four IEC 62443 parts. Only Not met fails; three others pass only with approved documentation; unsampled zones get none.
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