About Kirimas I/O
Kirimas I/O is a practical reference site for electrical engineering, industrial automation, and PLC work. It exists for the people who actually do this job — maintenance technicians, panel builders, controls engineers, and the self-taught crowd working their way in. Everything here is written to be used on site, not read for a grade.
Who runs it
I’m Dovydas Kersys, an electrical and automation engineer based in Lithuania. My day-to-day is control panel design, PLC programming and commissioning, and troubleshooting automation systems that have stopped doing what they’re supposed to do. Every tutorial, diagram, and calculator on this site came out of that work. Most of the calculators exist because I needed the number myself, got tired of doing it on a scrap of paper or trusting a sketchy web tool, and built something I could rely on.
How the content here is made
A few standards I hold this site to:
- Calculations are verified against the source standard, not copied from other websites. The RTD calculator uses the IEC 60751 Callendar-Van Dusen equation with the published coefficients; the thermocouple converter uses NIST ITS-90 polynomials; the motor protection figures come from NEC Article 430 tables. Where a standard defines the answer, that standard is cited on the page.
- Limits are stated openly. Every calculator has a section describing what it does not cover. A tool that hides its assumptions is worse than no tool, because you’ll trust a number that doesn’t apply to your situation.
- Safety-critical topics carry explicit warnings. Overcurrent protection, motor circuits, and anything touching live equipment are presented as educational reference — always to be verified against your current local code and signed off by a qualified person before installation.
- Corrections are welcome and acted on. If something here is wrong, I want to know. Engineering content that doesn’t get corrected decays into misinformation.
What you’ll find
- Calculators — wire sizing, voltage drop, motor FLA and starting current, transformer sizing, 4-20 mA scaling, encoder resolution, Modbus register addressing, RTD and thermocouple conversion, and more. Dual NEC/IEC awareness where the two codes differ.
- Technical articles — PLC scan cycle behaviour, fieldbus troubleshooting, fault code references, and the kind of practical detail that manuals assume you already know.
- Cheat sheets and diagrams — printable references for the workshop and the panel shop.
- Video walkthroughs — on YouTube.
Editorial independence
Where this site links to products, some links may be affiliate links, which are disclosed on the affiliate disclosure page. Recommendations are based on what I’d actually use. No manufacturer pays for a favourable mention here.
Get in touch
Corrections, questions, tutorial requests, or collaboration — dovydas@kirimas.com. I read everything, and technical corrections get priority.