Hi Product Hunt! 👋 I am an instrument engineer working with Siemens S7 PLCs every day. For years I struggled with reading and documenting legacy STL (Statement List) programs — especially during plant breakdowns when time is critical. Ladder Logic is visual and easy to trace, but converting STL to Ladder manually is slow and error-prone. I searched for a tool that could do this automatically and found nothing reliable — so I built one. STL to Ladder Logic Converter lets you paste any Siemens S7 STL code and get an instant visual Ladder Logic diagram. It correctly handles: NO and NC contacts Series and parallel connections Seal-in (latching) circuits Multiple output coils in parallel Jump instructions It is completely free, runs in the browser, and requires no installation. I built this as a solo side project alongside my full time job. It is still being improved and I would love feedback from anyone working with PLCs or industrial automation. Try it at stl-to-ladder.vercel.app and let me know what you think — any feedback is genuinely welcome!

STL to Ladder Converter

AI-powered STL to Ladder Logic converter for S7 PLCengineers

AI-powered STL to Ladder Logic converter for S7 PLCengineers