According to ISA/IEC 62443-1-1:2007 (Terminology, Concepts, and Models), the functional levels of the Industrial Automation and Control System (IACS) are derived from the Purdue Enterprise Reference Architecture (PERA). These levels are defined as follows:
Level
Function
Description
Level 0
Process
The actual physical process, including sensors and actuators.
Level 1
Basic Control
Devices responsible for direct control, such as PLCs and RTUs.
Level 2
Area Supervisory Control
Supervisory systems such as HMIs and SCADA, responsible for monitoring/control.
Level 3
Site Manufacturing Operations Management
Operations management systems such as MES, production scheduling, and workflow.
Level 4
Business Planning and Logistics
Enterprise-level systems such as ERP, supply chain, and logistics.
Analysis of Each Option:
Option A: Level 1: Supervisory Control
Incorrect. Level 1 is defined as Basic Control, not Supervisory Control. Supervisory functions appear at Level 2.
Option B: Level 2: Quality Control
Incorrect. Level 2 is defined as Area Supervisory Control, not Quality Control.
Option C: Level 3: Operations Management
Correct. Level 3 is specifically identified as Operations Management, which includes manufacturing execution and scheduling functions.
Option D: Level 4: Process
Incorrect. Level 4 corresponds to Business Planning and Logistics. The Process is represented at Level 0.
[References:, ISA/IEC 62443-1-1:2007, Section 6.2 – “Industrial automation and control system levels”, ISA/IEC 62443-3-3 – Security for industrial automation and control systems: System security requirements and security levels, ISA Training Materials – ISA/IEC 62443 Cybersecurity Fundamentals Specialist, , , , ]
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