A series of international standards (originating from ISA-99) for ICS security. IEC 62443 provides a comprehensive framework for securing industrial automation and control systems, including guidance on processes and technical requirements for components and systems. It covers everything from how to segment networks into zones and conduits, to secure product development for control system vendors, and continuous maintenance. If someone references “62443 compliance” or “ISA/IEC 62443”, they’re talking about following these best practices for OT security.
