Question 1

What is PLC programming software?

Accepted Answer

PLC programming software is the development environment engineers use to write, simulate, and deploy control logic to programmable logic controllers (PLCs). Modern tools support the IEC 61131-3 languages: Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), and Instruction List (IL).

Question 2

Is there a free PLC programming software?

Accepted Answer

Yes. OpenPLC is the leading free, open-source PLC programming software. The editor and runtime implement the IEC 61131-3 standard, run on Windows, macOS, Linux, and any browser, and work with low-cost hardware like Raspberry Pi and Arduino. Both are completely free, with no license keys.

Question 3

Which PLC programming software is best for beginners?

Accepted Answer

For beginners, OpenPLC is often the easiest entry point: the IDE is a free download, the documentation walks you through your first program, and you can simulate logic on your laptop before touching real hardware. Most proprietary vendor tools are powerful but require expensive licenses and are tied to specific PLC brands.

Question 4

What is OpenPLC an alternative to?

Accepted Answer

OpenPLC is an open alternative to the proprietary, vendor-locked PLC programming environments that arrive with a controller brand: the ones that need a paid licence per seat and tie a plant to a single hardware line. OpenPLC covers the same IEC 61131-3 languages, runs on Windows, macOS and Linux, and the same program can move to different hardware, so the toolchain stops deciding what you are able to buy next.

Question 5

Does OpenPLC support Ladder Logic and Structured Text?

Accepted Answer

Yes. OpenPLC supports Ladder Diagram, Function Block Diagram, Structured Text, Instruction List, Python, C, and C++.

Question 6

Can I use OpenPLC commercially?

Accepted Answer

Yes. The OpenPLC Editor is licensed under GPLv3 and the runtime under the MIT license, and both allow commercial use, so you can program and deploy commercial machines and production environments at no cost. Optional vendor device packages and cloud services are licensed separately.

Question 7

What software is used for PLC programming?

Accepted Answer

Engineers program PLCs with an IEC 61131-3 development environment. OpenPLC Editor is a free, open-source option that supports Ladder Diagram, Function Block Diagram, Structured Text, and Instruction List, and runs on Windows, macOS, Linux, and any browser. Proprietary alternatives are typically tied to a single hardware vendor and require paid licenses.

Question 8

How do I download free PLC programming software?

Accepted Answer

You can download OpenPLC Editor for free from the Autonomy website. Installers are available for Windows, macOS (Intel and Apple Silicon) and Linux, with no license keys or registration required.

Question 9

Can I try PLC programming without a PLC?

Accepted Answer

Yes. OpenPLC Editor includes a built-in Simulator that runs your logic entirely in the editor, with a live debugger and real-time variable monitoring, so you can write and test your programs before deploying to real hardware.

Feature	OpenPLC	Typical proprietary IDE
Free to download		Limited
Open source
IEC 61131-3 compliant		Varies
Runs on Windows / macOS / Linux		Windows only
Vendor-neutral hardware
Python & C++ function blocks

The free PLC programming software for modern automation

Why engineers choose OpenPLC

Free, open-source core

Vendor-neutral

Standards-first

OpenPLC vs other PLC programming software

Frequently asked questions

Start programming PLCs for free