A 32-section interactive guide to SCADA and industrial control systems — covering the ISA-95 Purdue reference model, ISA-101 high-performance HMI design, ISA-5.1 P&ID symbology and PID control theory, the five IEC 61131-3 PLC programming languages, Modbus and EtherNet/IP industrial protocols, IEC 62443 (ISA-99) OT cybersecurity, and SCADA project documentation and commissioning. Every chapter pairs a technical reference page with its own full-size illustrated figure slide.
Parts A–C build the process and architecture foundation: typical SCADA system architecture, the ISA-95 Purdue reference model, ISA-101 HMI design principles and color standards, alarm annunciation per ISA-18.2, ISA-5.1 P&ID symbology, and PID control theory including tuning and valve characteristics. Parts D–G go deeper into implementation: the five IEC 61131-3 PLC programming languages (Ladder, Structured Text, Function Block Diagram, Instruction List, Sequential Function Chart) with worked examples, Modbus and EtherNet/IP industrial communication protocols, IEC 62443 zones/conduits and ICS cybersecurity fundamentals, and the complete SCADA project documentation roadmap from FDS through FAT/SAT and commissioning handover.
Use the Prev / Next buttons at the bottom, or press the arrow keys on your keyboard. Click the ☰ menu button in the top-right to open the table of contents and jump to any of the 32 chapters. Each chapter's reference figure follows immediately after its text as its own dedicated slide, sized to keep diagrams, tables, and code listings fully legible.
Controls engineers and automation integrators learning SCADA/ICS architecture and PLC programming standards; process and instrumentation engineers who need a working reference for P&ID symbology and control loop tuning; OT/IT security professionals studying IEC 62443 and NIST CSF applied to industrial environments; and engineering students and technicians preparing for automation, controls, or industrial cybersecurity roles.
The Purdue model organizes an industrial facility into five numbered levels — Level 0 (physical process), Level 1 (basic control: PLC/DCS/RTU), Level 2 (supervisory control: SCADA/HMI), Level 3 (manufacturing operations management: MES/historian), and Level 4 (enterprise: ERP) — separated by firewalls and an industrial DMZ between Levels 3 and 4. It is the standard basis for both system architecture and IEC 62443 security zone segmentation.
ISA-101 defines high-performance HMI design principles: a four-level display hierarchy (Process Overview, Area Overview, Equipment Faceplate, Diagnostic Detail View), the ASM Consortium color standard (neutral gray backgrounds with color reserved only for state changes), and consistent navigation so operators can find critical information quickly and recognize abnormal conditions by exception rather than by scanning a cluttered screen.
IEC 61131-3 defines five standard languages usable within one PLC project: Ladder Diagram (LD, relay-style graphical logic), Structured Text (ST, a high-level Pascal-like text language), Function Block Diagram (FBD, block-and-wire graphical logic), Instruction List (IL, low-level assembly-style mnemonics), and Sequential Function Chart (SFC, graphical step/state sequencing for batch processes).
Modbus is a simple, widely-supported master-slave protocol running over RS-485 serial (Modbus RTU) or Ethernet (Modbus TCP) with basic addressing and low built-in security. EtherNet/IP layers the Common Industrial Protocol (CIP) over standard Ethernet, supporting both cyclic implicit I/O connections and acyclic explicit message connections, with broader support for real-time control and functional safety.
IEC 62443 requires segmenting an industrial network into security zones (Enterprise, DMZ, SCADA/Operations, Control, Safety) each assigned a Security Level, connected only through conduits — almost always firewalls — whose security level must equal or exceed the lower of the two zones they connect. This ensures high-risk zones like safety systems are never directly reachable from lower-security zones like the enterprise network.
Disclaimer: This guide summarizes general SCADA, industrial control, and cybersecurity concepts for educational purposes only. It is not a substitute for the full ISA, IEC, or NIST standards it references, nor for a licensed automation, controls, or cybersecurity professional's judgment on an actual project. Always consult the applicable current standards, your system integrator, and qualified engineering staff for real SCADA/ICS design, configuration, and security decisions.