Getting Started with PLC Programming and Industrial Automation: Learning Paths and Tools

The industrial automation field is experiencing a significant talent shortage. Companies are struggling to find skilled PLC programmers and automation engineers, creating unprecedented opportunities for newcomers willing to invest in learning. However, breaking into the field can feel overwhelming—there are dozens of platforms, programming languages, and tools to choose from, and the learning curve is steep. This guide cuts through the noise and gives you a practical roadmap to start your automation career.

Understanding the PLC Landscape

Before diving into programming, you need to understand what PLCs are and why they matter. A Programmable Logic Controller (PLC) is the brain of most industrial automation systems. It reads inputs from sensors, executes logic based on programmed instructions, and controls outputs like motors, valves, and lights. Unlike general-purpose computers, PLCs are designed for reliability, real-time performance, and harsh industrial environments.

The good news: PLC fundamentals are consistent across platforms. Once you understand the core concepts—inputs, outputs, logic, and timing—you can transfer that knowledge to nearly any PLC system. The bad news: there are many different platforms, each with its own ecosystem and programming approach.

Major PLC Platforms and Their Strengths

ABB Process Automation systems like the 800xA represent enterprise-grade solutions for large-scale operations. These distributed control systems (DCS) excel in process industries like chemical manufacturing, oil and gas, and utilities. The 800xA platform integrates PLCs, HMIs, and analytics into a unified environment, making it ideal for complex, interconnected systems.

Danfoss specializes in automation solutions for HVAC, refrigeration, and motion control. Their platforms are particularly strong in applications requiring precise temperature and pressure management. If you're interested in building systems automation or industrial climate control, Danfoss is worth exploring.

WEG and LS Electric provide cost-effective PLC solutions popular in manufacturing and smaller industrial facilities. These platforms offer a gentler learning curve and lower licensing costs, making them excellent starting points for newcomers.

Beijer focuses on HMI (Human Machine Interface) and visualization solutions that work across multiple PLC platforms. Their tools help you create the operator dashboards and monitoring screens that let humans interact with automated systems.

For absolute beginners, starting with a platform known for accessibility and community support is crucial. The platform matters less than building solid fundamentals.

Choosing Your First PLC Platform

Your choice of first platform should depend on three factors: accessibility, community support, and career goals.

Accessibility and Cost

Enterprise platforms like ABB's 800xA and Danfoss systems are powerful but expensive. Development software, licensing, and hardware can cost thousands of dollars. For learning, this is a barrier.

Mid-range platforms from WEG and LS Electric offer better value. They're widely used in manufacturing facilities worldwide, so skills transfer directly to job opportunities. Many educational institutions use these platforms, and you can often find used hardware affordably.

Community and Learning Resources

The automation community is smaller than general software development, but it's active and helpful. Look for platforms with:

• Active forums and user groups
• YouTube tutorials and documentation
• Open-source tool support
• Educational partnerships

Career Goals

If you're targeting large process industries (chemical plants, refineries, utilities), ABB Process Automation and Danfoss experience is valuable. If you're aiming for manufacturing facilities, automotive suppliers, or smaller industrial shops, WEG and LS Electric skills are more immediately marketable.

PLC Programming Languages: Which Should You Learn?

The IEC 61131-3 standard defines five programming languages for PLCs. You don't need to master all of them, but understanding the differences helps you choose the right tool for each job.

Ladder Logic (LD)

Ladder logic is the oldest and most intuitive PLC language. It visually represents electrical circuits using "rungs" of logic. If you've studied basic electrical circuits, ladder logic feels natural. It's excellent for learning PLC fundamentals because the visual representation makes logic flow obvious.

Best for: Beginners, simple control logic, troubleshooting existing systems.

Structured Text (ST)

Structured Text is the closest thing PLCs have to traditional programming languages. It resembles Pascal or Python and includes variables, functions, loops, and conditional statements. ST is more powerful than ladder logic for complex calculations and data manipulation.

Best for: Complex algorithms, data processing, engineers with software development backgrounds.

Function Block Diagram (FBD)

FBD uses graphical blocks connected by lines to represent logic. It's somewhere between ladder logic and structured text in terms of complexity and power. FBD excels at representing process flows and interconnected systems.

Best for: Process control, systems with multiple interconnected functions, visual thinkers.

Statement List (IL) and Sequential Function Charts (SFC)

These are less commonly used but valuable in specific contexts. IL is a low-level, assembly-like language. SFC is excellent for representing sequential processes with multiple states.

Recommendation for beginners: Start with ladder logic to understand PLC fundamentals, then move to structured text as you tackle more complex projects. Most professional work uses a combination of languages.

Building Your Learning Path

Phase 1: Fundamentals (Weeks 1-4)

Start with the absolute basics:

1. Understand PLC architecture — inputs, outputs, memory, scan cycle, I/O modules
2. Learn ladder logic — contacts, coils, timers, counters, basic logic gates
3. Study IEC 61131-3 basics — data types, variables, naming conventions
4. Build simple projects — LED control, button logic, timer-based sequences

Use free or low-cost platforms for this phase. Many manufacturers offer free software with limited functionality specifically for learning.

Phase 2: Intermediate Skills (Weeks 5-12)

Expand your capabilities:

1. Master structured text — variables, functions, loops, conditional logic
2. Learn HMI basics — creating operator interfaces with tools from Beijer or similar platforms
3. Understand communication protocols — Modbus, Ethernet/IP, MQTT for IoT applications
4. Build multi-function projects — systems combining multiple control strategies

At this stage, consider investing in a small PLC kit or used hardware. Hands-on experience with real equipment accelerates learning dramatically.

Phase 3: Advanced Topics (Weeks 13+)

Specialize based on your interests:

• DCS and SCADA systems — ABB's 800xA platform or Danfoss systems for large-scale operations
• Motion control — servo motors, variable frequency drives (VFDs), coordinated axis control
• Process automation — PID loops, analog signal processing, recipe management
• Industrial IoT — connecting PLCs to cloud platforms, data logging, predictive maintenance
• Safety systems — functional safety, SIL ratings, safety-certified programming

Practical Tools for Learning

Commercial Platforms

ABB Process Automation 800xA offers a comprehensive environment for DCS/SCADA learning, though licensing is expensive. Many universities have academic licenses.

Danfoss provides simulation tools that let you test logic without hardware.

WEG and LS Electric platforms often include free or low-cost development software with hardware purchases.

Beijer HMI tools work across multiple PLC platforms, making them valuable for learning visualization and operator interface design.

Open-Source and Low-Cost Alternatives

The open-source community has created excellent tools for PLC development:

• OpenPLC — A free, open-source PLC runtime that runs on Linux, Windows, and even Raspberry Pi
• VS Code extensions — Several extensions provide IEC 61131-3 support, syntax highlighting, and debugging
• CODESYS — Offers a free development environment (though runtime licensing applies)

These tools let you learn programming without expensive licensing. You can test logic on your computer before deploying to real hardware.

Real-World Project Examples

Example 1: Smart Manufacturing Cell

Build a system that controls a small production line:

• Inputs: Proximity sensors detecting part position, pushbuttons for manual control
• Logic: Sequence motors to move parts through stations, manage timing between operations
• Outputs: Motor starters, solenoid valves, indicator lights
• HMI: Dashboard showing production count, cycle time, fault status

This project teaches sequencing, timing, and basic HMI design.

Example 2: Environmental Monitoring System

Create a system for monitoring and controlling HVAC conditions:

• Inputs: Temperature and humidity sensors
• Logic: PID control loops maintaining setpoints, alarm logic for out-of-range conditions
• Outputs: Damper control, compressor enable/disable
• Communication: Send data to cloud via MQTT for remote monitoring

This project teaches analog signal processing, PID control, and IoT integration.

Example 3: Automated Guided Vehicle (AGV) Control

Develop control logic for a mobile robot:

• Inputs: Proximity sensors, encoders, wireless commands
• Logic: Path following, obstacle avoidance, mission sequencing
• Outputs: Motor speed control via VFDs, indicator lights
• Communication: Receive commands and send status via MQTT

This project integrates motion control, communication, and complex sequencing.

Breaking Into the Industry

Learning PLC programming is one thing; landing a job is another. Here's how to improve your prospects:

1. Build a portfolio — Document your projects with code, schematics, and videos. GitHub is perfect for this.
2. Get certified — Manufacturer certifications (ABB, Danfoss, WEG) are valuable. Many are free or low-cost.
3. Network — Join automation engineering groups, attend conferences, connect with local integrators.
4. Target integrators — System integrators hire more entry-level automation engineers than end-user facilities.
5. Consider apprenticeships — Many manufacturers and integrators offer apprenticeship programs.
6. Emphasize soft skills — Communication, problem-solving, and documentation matter as much as technical skills.

Your Next Step

The automation industry needs skilled professionals, and the barrier to entry is lower than ever. Start with fundamentals, choose a platform that matches your goals, and build projects that demonstrate your capabilities.

Gross Automation carries a comprehensive range of PLC systems, HMI platforms, and industrial components from leading manufacturers including ABB Process Automation, Danfoss, WEG, Beijer, and LS Electric. Whether you're sourcing equipment for learning projects or deploying production systems, our team can help you select the right platform for your needs and budget. Contact us today to discuss your automation goals and explore the tools that will accelerate your learning journey.