Understanding ISA/IEC 62443: A Guide for OT Security Teams

This blog post provides an overview of the ISA/IEC 62443 industrial cybersecurity framework for OT, summarizing its goals, a risk-based approach, and lifecycle integration. It explains core concepts including risk management and zone/conduit segmentation, the Purdue reference model, the three types of Security Levels (Target, Capability, Achieved), and the use of compensating countermeasures when native capabilities are insufficient, with guidance for asset owners, system integrators, and component suppliers.