PLC Simulator Projects Free: Complete Guide to Learning Automation Without Hardware

Getting started with industrial automation doesn’t require a $5,000 PLC sitting on your desk. Nowadays, powerful free PLC simulators let you build real-world projects, master ladder logic, and develop skills that transfer directly to factory floors—all from your home PC.

Whether you’re a student tackling your first automation course, a technician expanding your skill set, or a hobbyist interested in building something cool, this guide walks you through the best free tools, concrete project ideas, and practical tips for learning PLC programming without spending a dime on hardware.

Introduction to Industrial Automation

Industrial automation is transforming the way the world manufactures, processes, and delivers products. By leveraging advanced control systems, companies can boost efficiency, reduce operational costs, and achieve higher product quality. At the core of this revolution is PLC programming—using programmable logic controllers to automate everything from assembly lines to building management systems.

PLC programming software is the essential tool that allows engineers, students, and automation enthusiasts to design, test, and implement these control systems. Thanks to the rise of free software, anyone can now download PLC programming tools and start building real automation projects without a major financial commitment. This opens up opportunities for students to gain hands-on experience, for engineers to prototype new ideas, and for hobbyists to explore the world of industrial automation from their own home.

Whether you’re interested in learning the basics of control logic or developing complex automation systems, free PLC programming software puts the power of industrial automation at your fingertips. With just a PC and an internet connection, you can join a global community of learners and professionals shaping the future of automation.

PLC Programming Fundamentals

Understanding PLC programming fundamentals is the first step toward mastering industrial automation. The most common language is ladder logic—a visual programming method that mimics traditional electrical relay circuits, making it intuitive for those with an electrical background. Ladder logic is widely used for its clarity and ease of troubleshooting, especially in control and automation systems.

Structured text is another key language, offering a high-level, text-based approach similar to programming languages like Pascal or C for programmable logic controller (PLC) programming. This is ideal for complex calculations, data handling, and advanced control strategies. Function block diagrams provide a graphical way to connect functional blocks, making it easier to visualize process flows.

Modern PLC programming software often includes advanced features such as virtual PLCs (vPLCs) and integrated PLC simulators. These tools allow you to write, test, and debug your programs in a virtual environment, eliminating the need for physical hardware during the learning and development phase. By simulating control logic and program behavior, you can experiment freely, refine your skills, and ensure your code works as intended before deploying it to real equipment.

Mastering these fundamentals—ladder logic, structured text, and the use of PLC simulators—lays a strong foundation for building reliable, efficient automation systems.

Answer in 30 Seconds: Best Free PLC Simulator Projects in 2024

If you’re looking for the quick answer, here are the top free PLC simulators available right now:OpenPLC (open-source, runs on Windows/Linux/Raspberry Pi), CODESYS V3 (industry-standard IDE with built-in simulation; CoDeSys is available free on the CoDeSys website and is fully featured), Do-more Designer (AutomationDirect’s polished ladder-focused tool), PLC Ladder Simulator 2 (Android app for mobile learning), and Siemens LOGO! Soft Comfort demo (building automation flavor). All of these let you create and test real automation logic without purchasing physical PLCs. PLC Fiddle is also a popular browser-based ladder logic simulator that requires no installation, making it accessible through any browser.

Quick-start project ideas matched to specific tools:

• Traffic light intersection ? OpenPLC Editor with internal memory simulation or Factory I/O demo scene
• Bottle filling line with sensors ? CODESYS V3 simulation with timers and counters
• Motor start/stop with emergency stop ? Do-more Designer simulator for realistic ladder workflow
• Stairway lighting with off-delay ? LOGO! Soft Comfort demo using function block style
• Basic tank level control ? PLC Ladder Simulator 2 on your phone for practice anywhere
• Home lighting automation ? OpenPLC Runtime on Raspberry Pi with GPIO

Improving PLC skills is highly accessible in 2026 due to several free software suites and online simulators that require no hardware.

All tools described here are free as of 2024 and can be used without buying physical PLCs. Some have limitations—demo time restrictions, no hardware download capability, or feature caps—but each provides enough functionality to complete meaningful learning projects. Free PLC programming software provides hands-on experience at no cost.

What Is a PLC Simulator and Why Use It for Free Projects?

A PLC simulator is software that emulates the functionality of a programmable logic controller—the industrial digital computer that runs factory equipment, traffic systems, and building automation. These simulators replicate core operations like input/output scanning, timer and counter functions, and rung logic execution, letting you verify program behavior without touching real hardware.

There’s an important distinction between two categories of simulators: vendor simulators tied to specific hardware (Siemens, AutomationDirect, Allen Bradley) and independent or open-source tools like OpenPLC and CODESYS-based systems that work across multiple platforms. For a deeper understanding of PLC programming, review our comprehensive guide on ladder logic fundamentals.

Why simulators matter for learning:

• Zero hardware cost — No need to purchase expensive PLCs, I/O modules, or power supplies
• Safe testing environment — Test interlocks and safety logic without risk of damaging equipment or injury
• Remote learning capability — Especially valuable since the 2020-2021 shift toward online education
• Fast iteration — Modify and re-test logic in seconds rather than rewiring physical connections
• Portfolio building — Create documented projects that demonstrate skills to employers

Many tools marketed as “free PLC simulators” are actually full PLC programming software packages—complete IDEs like CODESYS V3, Do-more Designer, or OpenPLC Editor—with integrated runtimes or soft-PLCs that simulate the target hardware directly on your computer.

Key Features to Look for in Free PLC Simulator Software

Not all free simulators offer the same capabilities. For projects that go beyond blinking a virtual LED, you need to evaluate what each tool actually provides. Some handle only basic ladder logic, while others support the full IEC 61131-3 language set, HMI integration, and connections to 3D factory simulators with realistic physics.

Increasingly, advanced PLC simulator projects are leveraging cloud-based platforms for deploying, managing, and storing virtual PLCs and automation projects. Cloud orchestration enables remote access, easier collaboration, and scalable resources for industrial automation.

Feature categories to evaluate before choosing:

Licensing nuances trip up many beginners. For example, Siemens LOGO! Soft Comfort demo allows full simulation but restricts saving or connecting to real hardware. CODESYS provides a free IDE and localhost simulation, but deploying to certain industrial targets requires paid runtimes from hardware vendors. Always check what’s actually included before investing hours in a tool.

Usability and accessibility are also key—making PLC tools accessible and relatable to human users is essential, as human input and understanding are crucial in designing and learning automation systems.

Even on simulated projects, basic security awareness matters. Avoid exposing OpenPLC or soft-PLC network ports directly to the internet during testing—habits formed now carry into real plant work later.

Best Free PLC Simulators for Project-Based Learning (2024)

This section compares specific free tools and matches them to the project types they handle best. Whether you’re focused on education, hobby automation, or advanced prototyping, there’s a great tool available at no cost.

The focus here is on tools that include either a built-in PLC simulator or a free PLC IDE that connects to external simulation environments. Each subsection covers one major tool, with detailed project ideas appearing in later sections:

• OpenPLC + Raspberry Pi integration projects
• CODESYS-only simulation scenarios
• Do-more Designer for production-style learning
• LOGO! for building automation basics
• Android app scenarios for mobile practice

OpenPLC & OpenPLC Runtime

OpenPLC is an open-source IEC 61131-3 platform created by Thiago Alves, consisting of three main components: the Editor (where you write programs), the Runtime (which executes them), and a WebServer for monitoring. Current community builds run on Windows, Linux, and directly on Raspberry Pi hardware.

Key capabilities:

• Supports all five IEC 61131-3 languages: LD, ST, FBD, IL, and SFC
• Built-in simulator mode in the Editor for testing without hardware
• Can run projects on PC-based runtime or low-cost hardware like Raspberry Pi 4
• Aligns with modern ICS cyber security research and testing methodologies
• Active community with documentation and tutorials available online

Typical free projects with OpenPLC:

• Traffic light intersection using internal memory bits for state sequencing
• Tank level control with two pumps and high-level alarm logic
• Conveyor system with start/stop and jam detection using simulated digital I/O

OpenPLC can connect to external 3D simulators or SCADA systems via Modbus/TCP or OPC UA—we’ll cover integration projects in the advanced section later.

CODESYS V3 Simulation

CODESYS V3 is one of the most widely used IEC 61131-3 development environments in the world. The Windows IDE (versions 3.5.x in 2024) is free to download and includes a local simulation runtime that executes your programs without any hardware connection.

What makes CODESYS stand out:

• Full support for LD, ST, FBD, SFC, and CFC programming languages
• Built-in soft-PLC that runs directly on your development machine
• Professional debugging features including breakpoints and watch windows
• Skills transfer directly to CODESYS-based PLCs from WAGO, Beckhoff, and other brands

Concrete project ideas for CODESYS:

• Bottle filling line with proximity sensors, fill timers, and reject logic
• 4-floor elevator control using SFC for floor request and door sequencing
• Parking lot gate with vehicle detection and barrier timing

The licensing caveat: IDE and simulation on localhost are completely free. Deploying to certain industrial targets or using advanced features may require paid runtimes from hardware vendors—but for learning and prototyping, the free version covers everything you need.

Do-more Designer Simulator (AutomationDirect)

Do-more Designer is AutomationDirect’s free Windows IDE (current 2.x versions) for their Do-more PLC family. It includes a powerful built-in simulator that runs your ladder logic without requiring any physical hardware.

Features that make it valuable for learning:

• Ladder-only programming with a clean, intuitive interface
• Live simulation with all instructions functional
• Integrated data view and trend view for monitoring variables
• Instruction set designed for production-style projects
• Interface closely mirrors real plant workflow and documentation practices

Project ideas perfect for Do-more Designer:

• Warehouse conveyor with start/stop, emergency stop, and photoeye detection
• Automatic car wash sequence with timed stages for wash, rinse, and dry
• Small HVAC air handler with fan control, filter alarm, and temperature interlock

While Do-more Designer and its simulator are completely free, running programs on real BRX or Do-more CPUs requires purchasing the hardware. For learning purposes, the simulator provides everything you need.

Siemens LOGO! Soft Comfort Demo

LOGO! Soft Comfort V8.x demo is a free download from Siemens that lets you create, test, and simulate ladder and function block diagrams for LOGO! logic modules—the compact controllers widely used in building automation and small OEM machines.

What the demo provides:

• Drag-and-drop FBD style programming with ladder mode option
• Built-in simulation for testing before hardware deployment
• Interface that mirrors the larger Siemens ecosystem workflow
• Limitations on saving/exporting and online hardware connection in demo mode

Realistic mini-projects for LOGO!:

• Stairway lighting with off-delay timers and multiple switch inputs
• Garden irrigation controller with weekday scheduling and manual override
• Garage door system with interlocks and safety edge simulation

LOGO! logic is particularly popular in European building automation and small machine control. Even working in demo mode, you gain practical skills that apply to real installations.

PLC Ladder Simulator 2 (Android)

PLC Ladder Simulator 2 is a free Android app (available on Google Play since around 2019-2020) that brings ladder logic programming to your phone or tablet. It’s designed specifically for beginners who want to understand PLC fundamentals anywhere.

What you can do with it:

• Learn contacts, coils, timers, and counters through touch-based editing
• Simulate inputs by tapping virtual buttons and switches
• Watch outputs respond in real-time with virtual lamps and motor indicators
• Practice during commutes, breaks, or anywhere without a computer

On-the-go project ideas:

• Pedestrian crossing with push-button request and timed walk signal
• Motor jog circuit with seal-in contact and overload protection
• Tank filling sequence with high/low level sensors and pump control

This app is ideal for beginners who don’t have regular PC access but want to understand ladder logic fundamentals. The logic habits you build transfer directly to bigger vendor software when you’re ready to advance.

Allen Bradley PLCs: Simulating Rockwell Automation Projects for Free

Allen Bradley PLCs, produced by Rockwell Automation, are a staple in factories and industrial plants worldwide. Traditionally, learning to program these systems required access to expensive hardware and proprietary software. Today, however, a range of free software tools makes it possible to simulate Allen Bradley projects right on your home PC or even a Raspberry Pi.

The latest versions of these free PLC programming tools often include support for Allen Bradley and other major brands, giving you a great toolset for both learning and practice. Whether you’re a student looking to download free software for your coursework, a hobbyist experimenting with automation at home, or an engineer wanting to prototype new ideas, these simulators provide a flexible and accessible platform.

With support for multiple brands and the ability to run on various devices—including Windows PCs and Raspberry Pi—these tools make it easy to simulate, test, and refine your PLC programs. You can build and debug projects, explore advanced features, and gain hands-on experience with the same logic and workflows used in real industrial environments. This approach not only accelerates learning but also prepares you for working with actual Allen Bradley hardware and other automation systems in the field.

Free PLC Simulator Project Ideas from Beginner to Advanced

Now that you know the tools, let’s look at concrete projects you can build. This section walks through a progression from simple logic exercises to integrated systems that could serve as portfolio pieces for job interviews or university submissions.

Each project maps to real-world industrial tasks—the same logic patterns you’ll encounter on factory floors, in building systems, and in process control environments.

Beginner Projects: Core Ladder Logic and Timing

Start here if you’re new to PLC programming. These projects teach fundamental concepts that underpin all automation work.

1. Single Motor Start/Stop with Emergency Stop

Create a circuit with momentary START and STOP buttons, a seal-in contact that keeps the motor running after START is released, and an emergency stop that overrides everything. Required I/O: two input buttons, one output coil, one internal bit for latching.

This teaches the fundamental “seal-in” pattern used in virtually every industrial motor control application.

2. Traffic Light Controller

Implement a fixed-cycle traffic light sequence: green (30 seconds) ? yellow (5 seconds) ? red (30 seconds) ? repeat. Use TON timers to advance through states. This introduces sequential logic and the importance of clear state transitions.

3. Basic Tank Filling

Control a pump that fills a tank until a high-level sensor activates, then stops. Add a low-level sensor that prevents the pump from running dry. This is your first exposure to process control fundamentals.

4. Conveyor with Photoeye Stop

For a deeper understanding of the pros and cons of developing your own custom HMI compared to using commercial HMI systems, see the analysis in C# HMI vs. Commercial HMI – Which One Is Best – PLCGurus.NET.

Run a conveyor motor that stops when a photoeye detects a box, waits 3 seconds for pickup, then restarts. Add jam detection that alarms if the photoeye stays blocked too long.

Recommended tools for beginner projects: PLC Ladder Simulator 2 and Do-more Designer for ladder-focused learning, LOGO! Soft Comfort demo for those who prefer drag-and-drop function block style.

Intermediate Projects: Sequences, Alarms, and Basic HMI

These projects introduce multi-step sequences, alarm handling, and operator interface concepts.

1. Automated Bottle Filling Line

Design a sequence that detects a bottle at the fill station, opens a valve for a timed fill, closes the valve, and releases the bottle to the next station. Add reject logic for bottles that don’t trigger the presence sensor properly.

2. 4-Stage Batch Mixing Process

Create a batch process: fill tank with ingredient A, add ingredient B, run agitator for mixing time, then drain to the next vessel. Use SFC in CODESYS or OpenPLC for clean step sequencing with transitions based on timers and level sensors.

3. Packaging Line with Jam Detection

Control multiple conveyors feeding a packaging station. Implement jam detection that stops upstream conveyors when a downstream section is blocked, preventing product pile-up.

4. Multi-Zone Lighting with Schedules

Create a lighting control system with weekday schedules, manual override capability, and occupancy sensor integration. This mirrors real building automation projects.

For intermediate projects, start adding simple HMI elements:

• OpenPLC WebServer for basic monitoring
• CODESYS visualization for start/stop buttons and alarm displays
• Third-party Modbus panels to interact with your soft-PLC

Alarm handling patterns to practice: latching alarms that require acknowledgment, reset logic with safety interlocks, and horn silence with visual indication remaining.

Pro tip: Before writing any code, document your sequence in a written step list. This mirrors professional engineering practice and makes debugging much easier.

Advanced Projects: Integrating 3D Simulators and Soft-PLCs

These projects combine your PLC programming with external simulation tools, creating realistic integrated systems.

1. Palletizing Cell with 3D Simulation

Connect OpenPLC or CODESYS to Factory I/O’s demo scenes via Modbus/TCP. Control a conveyor, palletizer, and wrapper using your ladder or structured text program while watching the 3D animation respond to your logic.

2. Multi-Conveyor Production Line

Build a system with multiple conveyors, diverters, and sorting logic controlled from a single project. Route products based on simulated barcode values (represented as integer tags). This teaches coordination between multiple equipment zones.

3. HVAC Plant with PID Control

Implement analog I/O tags representing temperature sensors and valve positions. Create PID loops for supply air temperature control with cascade to damper position. CODESYS includes built-in PID function blocks perfect for this application.

Linking your soft-PLC to external simulators requires understanding:

• Modbus/TCP configuration (IP addresses, port numbers, register mapping)
• Scan time and polling interval relationships
• How to verify deterministic response in simulated environments

These projects suit senior university labs or advanced hobbyists comfortable with networking basics. More powerful PCs help when running 3D simulators alongside your soft-PLC.

PLC Programming for Specific Industries: Real-World Applications in Simulation

PLC programming is at the heart of automation across a wide range of industries, from manufacturing and automotive to oil and gas, food processing, and pharmaceuticals. Each sector presents unique challenges, requiring tailored control strategies and specialized programming techniques. Simulation software bridges the gap between theory and practice, allowing you to apply PLC programming principles to real-world scenarios without the need for expensive hardware.

By using simulation tools, you can practice programming for specific hardware platforms—such as Allen Bradley PLCs—and experiment with different programming languages, including structured text and ladder logic. These environments let you model complex processes, test your logic, and troubleshoot issues in a safe, virtual space. This hands-on approach is invaluable for training, as it mirrors the challenges and workflows found in actual industrial settings.

Whether you’re developing batch control systems for pharmaceuticals, automated assembly lines for automotive manufacturing, or process control for oil and gas, simulation software enables you to build, test, and refine your PLC programs. This real-world practice not only enhances your technical skills but also prepares you for the demands of modern industrial automation.

Step-by-Step: Creating Your First Free PLC Simulator Project

Let’s walk through a complete beginner project using OpenPLC Editor—from installation to running simulation. We’ll build a motor start/stop circuit with emergency stop and overload alarm.

Step 1: Download and Install

Download OpenPLC Editor (version 1.0 or later, current in 2024) from the OpenPLC project website. Install on Windows or Linux—the installer handles dependencies automatically.

Step 2: Create a New Project

Launch OpenPLC Editor and create a new project. Select Ladder Diagram as your programming language. Save the project with a meaningful name like “MotorStartStop.”

Step 3: Define Your Tags

Create the following variables in the variable editor:

Step 4: Write the Ladder Logic

Create your first rung with the seal-in circuit:

• START_PB contact (NO) in parallel with MOTOR_RUN contact (NO)
• In series with STOP_PB (NC), E_STOP (NC), and OVERLOAD (NC)
• Output to MOTOR_RUN coil

Create a second rung for the alarm:

• OVERLOAD contact (NO) driving ALARM output

Step 5: Start Simulation

Click the simulation button in OpenPLC Editor. The integrated simulator runs your program immediately. Use the forcing tools to toggle input states and watch outputs respond.

Step 6: Test Your Scenarios

• Toggle START_PB ON then OFF—motor should seal in
• Toggle STOP_PB OFF—motor should stop
• Test E_STOP override
• Test overload alarm activation

Common Troubleshooting:

• Outputs not responding: Check that you’re in RUN mode, not just editing
• Wrong addresses: Verify your tag addresses match your rung contacts
• Seal-in not working: Ensure parallel branch is correctly drawn around START and RUN contacts

A motivated beginner can complete this project in under an hour, including installation time.

For those interested in alternative free PLC simulator projects, the latest version of Rockwell Connected Components Workbench (CCW) is also available at no cost for Micro800 PLCs. The latest version (v12) includes simulation for basic logic and I/O, making it a strong choice for beginners and educational use, especially for those on a limited budget.

Troubleshooting PLC Programs in Simulated Environments

Troubleshooting is a critical skill for anyone working in industrial automation, and simulated environments offer the perfect space to develop and refine this expertise. With PLC simulators and virtual PLCs, you can safely debug and test your programs without risking damage to real equipment or causing costly downtime.

In a simulated environment, you have full control over the logic and can observe how your program responds to different inputs and scenarios. This makes it easier to identify faults, understand the root causes of issues, and apply corrective actions. You can practice diagnosing problems, stepping through code, and using advanced features like watch windows and force tools to monitor and manipulate variables in real time.

By regularly troubleshooting PLC programs in a virtual space, you build confidence and competence that translates directly to real-world automation systems. This hands-on practice is essential for engineers, technicians, and students alike, ensuring you’re well-prepared to handle the challenges of industrial automation and keep systems running smoothly.

Tips for Choosing the Right Free PLC Simulator for Your Goals

The “best” free simulator depends entirely on who you are and what you’re trying to accomplish.

Match your profile to the right tool:

Consider your constraints:

• Operating system: Windows-only (Do-more, LOGO!) vs. cross-platform (OpenPLC, CODESYS)
• Hardware access: Do you have a Raspberry Pi or Arduino to experiment with?
• School lab requirements: Does your program specify particular software?
• Career goals: Which brands will you likely encounter professionally?
• Remote access needs: Browser and cloud-based PLC simulators allow you to work from anywhere and collaborate easily.

Latest software updates: The latest version (v12) of Connected Components Workbench (CCW) now includes updated simulation functionality in the free version and an improved user interface, making it especially relevant for beginners and educational use.

Tips for faster progress: Pairing your software training with certification or targeted coursework can speed up your learning and help you master PLCs more efficiently.

Future transferability matters: Learning tools that mirror how big names structure their environments—tag databases, task configurations, online monitoring—smooths your transition to paid platforms like Siemens TIA Portal or Rockwell Studio 5000 later on.

Security and Good Practice, Even with Free Simulators

Simulated PLC projects aren’t just about learning logic—they’re about building habits that carry into real plant work. Modern industrial automation demands “secure by design” thinking from day one.

Best practices to adopt now: For more detailed insights, check out these 10 tips to better PLC programs.

• Keep soft-PLCs (OpenPLC Runtime, CODESYS runtime) bound to localhost during learning
• Never port-forward your simulation to the internet, even for “quick remote access”
• Use meaningful tag names that describe function, not just addresses
• Always include safe start conditions and emergency stop logic, even in simulations
• Document your I/O lists and program structure as if someone else will maintain it

Treat your project files like production assets:

• Use version control (Git works great for PLC program files)
• Maintain backups before making significant changes
• Keep a change log documenting what you modified and why

Once you move beyond simulation to real hardware, study dedicated resources on industrial control system security architecture. The habits you build now—aware of cyber security implications even in a learning environment—will serve you throughout your career.

Conclusion: Build Real Skills with Free PLC Simulator Projects

Free PLC simulators in 2024—OpenPLC, CODESYS, Do-more Designer, LOGO! Soft Comfort demo, and PLC Ladder Simulator 2—let you build realistic industrial automation projects with zero hardware cost. The tools are mature, the community support is helpful, and the learning curve is manageable for motivated beginners.

Progressing from simple ladder exercises to integrated 3D or soft-PLC systems creates a project portfolio directly relevant to industrial jobs or advanced engineering study. Every project you complete demonstrates practical skills that employers value.

Your action plan:

• Pick one tool from this guide based on your goals and constraints
• Choose one concrete beginner project (motor start/stop is perfect)
• Complete it this weekend—don’t overthink, just build
• Document your work with screenshots and notes
• Move to intermediate projects within two weeks

The programming skills you develop with these free tools transfer seamlessly into paid PLC platforms and real plant commissioning work. Engineers who can demonstrate hands-on project experience—even from simulation—stand out in interviews and on the job.

Stop reading about PLC programming and start doing it. Your first free simulator project is waiting.