PLC Platforms
CODESYS: The Universal PLC Platform
CODESYS is becoming the standard for PLC programming across manufacturers. Understanding this platform helps you work with a growing number of controllers from different vendors using the same development environment.
What is CODESYS?
CODESYS (Controller Development System) is an IEC 61131-3 compliant PLC programming environment developed by CODESYS GmbH in Germany. Unlike proprietary platforms like Studio 5000 or TIA Portal, CODESYS is licensed to hardware manufacturers who embed it in their controllers. This means the same programming environment works across dozens of different PLC brands.
Who Uses CODESYS?
CODESYS is embedded in controllers from ABB, Beckhoff, Bosch Rexroth, Festo, Schneider Electric (Modicon M241/M251), WAGO, ifm, Turck, and many others. When you learn CODESYS, you can program PLCs from all these manufacturers without learning new software. This is valuable for integrators who work with diverse equipment.
IEC 61131-3 Languages
CODESYS supports all five IEC 61131-3 programming languages: Ladder Diagram (LD) for relay logic, Function Block Diagram (FBD) for graphical programming, Structured Text (ST) for text-based high-level code, Instruction List (IL) for assembly-like programming, and Sequential Function Chart (SFC) for state machine logic. You can mix languages within a project.
Modern Features
CODESYS includes object-oriented programming extensions, integrated visualization (HMI development), motion control libraries, CANopen and EtherCAT fieldbus support, OPC UA server capabilities, and web-based visualization. The platform continues to evolve with modern software development practices while maintaining industrial reliability.
CODESYS Advantages
| Benefit | Details |
|---|---|
| Multi-Vendor | Same software for 400+ hardware manufacturers |
| Standards-Based | Full IEC 61131-3 compliance |
| Modern IDE | Object-oriented, version control friendly |
| Integrated HMI | Built-in visualization development |
| Fieldbus Support | EtherCAT, CANopen, PROFINET, EtherNet/IP |
| Cost | Often lower-cost hardware alternatives |
Key Takeaways
CODESYS skills transfer across many PLC manufacturers
IEC 61131-3 compliance ensures structured, maintainable code
Structured Text in CODESYS is often more powerful than in proprietary platforms
Consider CODESYS-based PLCs for cost-sensitive projects without sacrificing capability
The platform is particularly strong for motion control and EtherCAT applications
Considering CODESYS-based controllers?
We program CODESYS PLCs from multiple manufacturers.