> iec_62443_series
IEC 62443 Series
Security for Industrial Automation and Control Systems (IACS) — Series Overview
The IEC 62443 series provides a comprehensive, multi-tiered framework designed specifically to secure Industrial Automation and Control Systems (IACS). Organized into four tiers—General, Policies & Procedures, System, and Component—it defines fundamental concepts like Zones and Conduits, Defense-in-Depth, and Security Levels (SL 1 to SL 4) to protect physical industrial processes from cyber threats without risking operational safety.
Scope & Applicability
Encompasses industrial automation and control systems across manufacturing, electric power utilities, oil & gas, water treatment, and transportation.
Non-Coverage Boundaries
Does not cover pure corporate office IT environments that lack physical interaction with sensors, actuators, or process controllers (which use ISO 27001).
Key Clauses & Control Requirements
Security Levels (SL 1 through SL 4)
SL 1 (casual/coincidental), SL 2 (intentional with simple means), SL 3 (sophisticated means/hackers), SL 4 (nation-state/advanced persistent threat).
Zones & Conduits Paradigm
Grouping assets sharing common security requirements into physical/logical Zones connected only by tightly monitored and filtered Conduits.
Required Regulatory & Audit Evidence Artifacts
- [✓]IACS Cybersecurity Program Charter and Governance Framework
- [✓]Plant-wide Zones and Conduits Architectural Map
- [✓]Target Security Level (SL-T) vs. Achieved Security Level (SL-A) Gap Analysis
“IEC 62443 is the Bible of OT security. In an industrial plant, availability and safety dominate confidentiality. A flat network connecting enterprise ERP to plant PLCs is a catastrophic incident waiting to happen.”
Cross-Surface Ecosystem Relationships
- IEC 62443 Industrial communication networks - Security ↗(International Electrotechnical Commission)
Frequently Asked Questions
What are the four tiers of the IEC 62443 series?
Tier 1: General (concepts and models); Tier 2: Policies & Procedures (asset owner & supplier programs); Tier 3: System (risk assessment, zones, technical requirements); Tier 4: Component (secure development & component hardening).