CODESYS: what it is and how it is used in industrial automation

CODESYS is a development environment for industrial automation, used to create software for PLCs (Programmable Logic Controllers) and other industrial control systems. It is widely used around the world for programming, configuring, and managing automation solutions.

For organizations working with industrial IoT, machine control, or smart industry, CODESYS is an important tool within the software ecosystem.

Summary

CODESYS is a software platform for developing PLC applications based on industrial standards. It supports multiple programming languages and can run on various hardware platforms.

Key points to remember:

• CODESYS is a development environment for PLC software
• it supports IEC 61131-3 programming languages
• it can run on different industrial controllers and devices
• it is used in industrial automation and IoT
• it enables vendor-independent development

What CODESYS actually is

CODESYS stands for Controller Development System. It is an integrated development environment (IDE) where engineers can write software for industrial control systems.

Instead of being tied to a single hardware vendor, CODESYS allows applications to run on different systems, as long as those systems support CODESYS.

This makes it a flexible platform within industrial automation.

How CODESYS works

CODESYS is used to develop control logic that runs on a PLC or industrial controller.

The basic process:

• an engineer develops an application in CODESYS
• the software is written in an IEC 61131-3 language
• the application is compiled
• the code is downloaded to a controller or device
• the device executes the logic and controls processes

CODESYS also provides tools for debugging, visualization, and monitoring.

Supported programming languages

CODESYS supports standard programming languages for industrial automation according to IEC 61131-3:

• Structured Text (ST)
• Ladder Diagram (LD)
• Function Block Diagram (FBD)
• Instruction List (IL, deprecated)
• Sequential Function Chart (SFC)

This allows different programming styles to be combined within a single project.

Benefits of CODESYS

CODESYS offers several advantages for developers and organizations.

Vendor independence

Because CODESYS is supported by multiple hardware vendors, it provides flexibility in hardware selection.

Standardization

By using IEC 61131-3, development follows international standards.

Scalability

CODESYS can be used for small machines as well as complex industrial installations.

Integration with IoT

CODESYS supports modern protocols and integrations, making it suitable for industrial IoT applications.

CODESYS in IoT and industry

Within industrial IoT (IIoT), CODESYS plays an important role as a bridge between operational technology (OT) and IT systems.

Typical applications include:

• machine control
• production automation
• data collection from industrial processes
• edge computing on industrial devices
• integration with cloud platforms

Through this role, CODESYS helps connect traditional industrial systems with modern digital infrastructures.

Considerations when using CODESYS

Although CODESYS offers many capabilities, there are also some considerations.

Learning curve

For those without experience in industrial automation, working with PLC languages can be complex.

Implementation differences

Although CODESYS is vendor-independent, specific implementations may vary between hardware vendors.

Security

When integrating with networks and IoT platforms, security must be carefully managed.

Why CODESYS is becoming more important

The industry is rapidly digitizing. Machines are becoming smarter, data is gaining importance, and systems are increasingly connected.

CODESYS plays a role in this by:

• providing standardized development
• enabling flexibility in hardware selection
• supporting IoT integration
• being suitable for edge and cloud architectures

As a result, it remains a relevant technology in modern industrial environments.

Conclusion

CODESYS is a powerful and flexible development environment for PLC programming and industrial automation. With support for international standards and broad hardware compatibility, it is widely used in both industrial and IoT applications.

For organizations working with industrial processes and connected devices, CODESYS provides a solid foundation for developing and managing automation solutions.

For more information, please contact us by phone at +31-85-0443500 or via email at info@thingsdata.com.