Foundational Requirement 1 (FR 1) in the ISA/IEC 62443 series is titled “Identification and Authentication Control (IAC)”. Its purpose is to control access to selected devices by ensuring that only authenticated and authorized users or systems can interact with critical IACS components.

“FR 1 – Identification and Authentication Control (IAC): This foundational requirement ensures that all users and components interacting with the system are uniquely identified and authenticated before access is granted.”

— ISA/IEC 62443-3-3:2013, Clause 4.2.1 – FR 1

This foundational layer supports higher-level security goals like use control, confidentiality, and system integrity.