PLC programming software: a decision table
The right choice depends on where you are learning, who can legally provide access, and what industrial systems you intend to support. This is a starting comparison, not an exhaustive vendor catalogue.
| Software | When to consider it | Access and licensing | Official reference |
|---|---|---|---|
| Rockwell Automation Studio 5000 Logix Designer | Job-specific learning for Rockwell Logix platforms | Licensed commercial software; editions and activations vary. Do not assume a course or video includes a personal license. | Rockwell official training |
| Siemens TIA Portal / STEP 7 | Job-specific learning for Siemens SIMATIC systems | Licensing, available evaluation options and training access depend on the product/version and region; verify with Siemens. | Siemens SIMATIC training |
| CODESYS Development System | Start practicing IEC 61131-3 programming without purchasing commercial engineering software | The development system is a free download and includes a demo SoftPLC. Unlicensed SoftPLC operation has time limits; production use is separately licensed. | CODESYS Development System |
| AutomationDirect CLICK / CLICK PLUS | Explore another manufacturer platform, especially if a school or employer uses CLICK | The manufacturer offers a free CLICK programming-software download. Physical PLC hardware and accessories are separate products. | CLICK getting started |
The IEC 61131-3:2025 standard describes ladder diagram, function block diagram and structured text. Instruction sets, project formats, simulation, libraries and equipment capabilities still vary between manufacturers.
Can you really learn PLC programming for free?
You can begin without buying industrial PLC hardware or a paid professional engineering suite. For example, CODESYS publishes a free Development System download that includes a demo SoftPLC. Its official North American store explains that the unlicensed SoftPLC demo automatically shuts down after two hours of runtime. This is useful for bounded learning exercises, not a license for continuous commercial operation.
AutomationDirect also publishes free CLICK programming software, but that does not make PLC hardware free. Studio 5000 and Siemens engineering tools have their own license/product rules. Check the vendor and your school or employer before assuming any particular trial, student entitlement, installation or simulator comes with a course.
For a first practice session, use an authorized, isolated simulator and keep outputs disconnected from physical equipment. Saving screenshots of the program and test outcomes is appropriate for a learning portfolio; redistributing a vendor’s licensed binaries is not.
Choose based on what employers actually ask for
Do not choose software solely because a training creator describes it as the most popular. Industrial job postings differ by region, plant type, original-equipment manufacturer and technology stack. Your first platform should help you understand the roles accessible to you.
These directories include jobs that mention the technology or relevant work, not necessarily exclusively programmer-titled positions. Review employer specifications, training expectations, travel and location requirements before deciding what to learn.
A sensible way to learn your first software environment
- Learn the physical context: identify input/output signals, schematics and the difference between an operator command and measured equipment feedback.
- Start with one logic language: use our ladder logic beginner exercise to learn direct contacts, negated contacts, coils and test cases.
- Write down a specification first: what must happen when both conditions are true, when a signal disappears, and after a simulated restart?
- Practice and troubleshoot in isolation: implement a small Boolean sequence, predict outputs, test each case and document discrepancies.
- Expand carefully: timers, counters, state logic, HMI, alarms, networks and drive integration follow once the simple sequence makes sense.
- Use job postings to fill the gaps: investigate the exact skills and entry requirements rather than listing every vendor product on your resume.
Frequently asked software questions
Do I need Studio 5000 to learn ladder logic?
No. Fundamental Boolean and sequencing concepts can be practiced on other suitable platforms, although platform-specific workflow and instructions are different. If your target role uses Logix controllers, supervised access to the relevant Rockwell environment becomes increasingly useful.
Are CODESYS and Studio 5000 interchangeable?
No. Shared programming concepts do not make project files, hardware configuration, instruction names, runtime behavior or licenses interchangeable. Treat a CODESYS practice project as evidence of transferable basics, not a claim that you have configured a Rockwell controller.
Will completing a course make me qualified to work independently on a live machine?
No. Training is one input. Real responsibilities can require electrical knowledge, site authorization, supervised experience, documented change control and specialist safety qualifications. An employer must define what tasks you are authorized and qualified to perform.
Should I purchase PLC equipment on day one?
Usually not necessary for a first Boolean-logic exercise. Use an authorized simulator first. Decide on hardware only after you understand its actual training value, supervision needs, power requirements and total cost.
Source notes and independence
- Rockwell official training (Rockwell Automation Studio 5000 Logix Designer)
- Siemens SIMATIC training (Siemens TIA Portal / STEP 7)
- CODESYS Development System (CODESYS Development System)
- CLICK getting started (AutomationDirect CLICK / CLICK PLUS)
- CODESYS Store North America, demo runtime and licensing information.
- IEC 61131-3:2025, programming language scope.
Editorial comparison prepared with AI assistance by PLC & SCADA Jobs, checked against the official manufacturer references linked above. We have not independently installed or benchmarked every platform. We are independent of the vendors and do not sell or sublicense their software. Statements about free access reflect the linked manufacturers’ published terms, not an individually tested license, price or trial entitlement. This is not an equipment commissioning manual.