Explain what ICS is and how its design priorities differ from standard IT systems
Course profile · Technology
Introduction to Industrial Control Systems (ICS)
A free course covering ICS fundamentals for engineers and IT professionals entering operational technology.
Free1h 34m25 lessonsBeginner
Outcome-focused
What You Will Learn in This ICS Course
Map the five levels of the Purdue Model and place any ICS component within it
Distinguish between PLC, HMI, SCADA, DCS, and RTU by function and where each sits in the architecture
Trace the path of a sensor reading from a field device through to an enterprise system
Name the major industrial communication protocols and explain what problem each was built to solve
Describe how industrial networks differ from IT networks in timing, failure tolerance, and physical environment
Identify the structural gaps in ICS architecture that make cybersecurity a distinct engineering challenge
About this course
What This Free ICS Course Covers
You work in engineering, IT, or a technical role and industrial control systems keep coming up. In job postings, in meetings with OT colleagues, in documentation you are expected to understand. You know your own domain. But when the conversation turns to PLCs, SCADA, or OT networks, you are reasoning from the edges of what you actually know. ICS has its own language, its own priorities, and its own logic, and there has never been a convenient place to pick up the basics without formal training.
This course introduces ICS foundations: systems, components, and industrial networks. Each section builds on the one before it. You will leave knowing what a control system is, how its components connect, and why the engineering decisions made decades ago still shape the security problems that OT teams deal with today.
The course is free because the foundation layer of ICS knowledge should not sit behind a paywall. It is the prerequisite that most ICS cybersecurity training assumes you already have.
If you want to go further, the paid ICS/OT Cybersecurity Fundamentals course on Udemy picks up exactly where this one ends, covering the threat landscape, IEC 62443, zone and conduit design, and incident response for environments where availability comes before everything else.
Is this for you?
Who this course is for
- IT professionals moving into OT or operational technology roles who need a working understanding of what they will be securing
- Engineers handed cybersecurity responsibility who need the ICS vocabulary before tackling security standards or frameworks
- Students building toward ICS cybersecurity roles who want a solid foundation before taking paid training
- Project managers and consultants who work alongside OT teams and need to follow technical discussions without guessing
Before you start
Requirements
- No prior knowledge of industrial systems required
- A general technical background in engineering, IT, or operations is helpful but not required
Inside the course · 25 lessons
Course outline
Welcome to the Course
What the course covers, who it is for, and what you will be able to do by the end
Course Roadmap
The course sections and how each one builds on the last
The Systems That Run the Physical World
What industrial control systems are, and where you have already met one without noticing
ICS vs IT: A Different Set of Priorities
Why availability and safety outrank confidentiality on a plant floor, and what that changes
Where ICS Is Used: Industries and Applications
Power, water, oil and gas, manufacturing and transport, and what each demands of its control system
The Purdue Model: How ICS Is Organised
The five levels, what lives at each, and how to place any component you meet
Safety and Reliability: Why You Cannot Just Reboot
What happens to a physical process when a controller stops, and why patching is not a weekend job
A Plant in Motion: How ICS Feels to Operate
A shift seen from the operator's chair, from alarm through to response
What You Do Not Know Yet: The Security Gap
The questions this course deliberately leaves open, and where they get answered
What Is a PLC: The Brain of Industrial Control
How a programmable logic controller reads inputs, runs its logic, and drives outputs
What Is an HMI: The Operator Interface
The screen an operator actually works from, and what it does and does not show them
What Is SCADA: Supervision at Scale
How supervisory control gathers data across many sites and presents it in one place
What Is a DCS: Distributed Control Explained
Where a distributed control system fits, and how it differs from SCADA in practice
RTUs and Field Devices: Where the Physical World Connects
Sensors, actuators and remote terminal units at the edge of the process
Engineering Workstations and Historians
Where the control logic is written, and where the process data is kept
How It All Fits Together: ICS System Architecture
Tracing one sensor reading from the field device all the way to an enterprise system
The Weak Points You Can Already See
The structural gaps that fall out of the architecture itself, before any attacker appears
Why Industrial Networks Are Different
Timing, determinism and failure tolerance, and where office networking assumptions break
Serial Protocols: Modbus and the Fieldbus Era
What Modbus was built to do, and the assumptions baked into it that still matter
Ethernet Comes to the Plant Floor
What changed when industrial systems moved onto Ethernet, and what came with it
OPC: The Connector Between ICS and IT
How OPC bridges the plant floor to the business network, and why that bridge matters
Network Topology in Industrial Systems
How industrial networks are laid out, and why the layout is a security question
What Normal ICS Traffic Looks Like
The baseline you need before anything abnormal can stand out
Closing Bridge: What Comes Next in Cybersecurity
Where this foundation leads, and what a cybersecurity course will assume you know
Final Word
A short close, and what to do next
Included materials
More than the videos
- 6 quizzes to check your understanding