Ladder logic is the lingua franca of industrial automation — if you've ever wondered how the PLC running a bottling line, an HVAC system, or a water treatment plant actually decides what to do, this is the notation that encodes those decisions. It looks like an electrical schematic (rails, rungs, contacts, coils) precisely because it grew out of relay logic that electricians already understood, and that history is still baked into how every modern PLC is programmed today.

Dr. Natarajan, a professor of Electronics and Instrumentation, walks through ten practical examples rather than dwelling on abstract syntax. That's the right shape for ladder logic specifically — the leap isn't learning what a normally-open contact does, it's learning to compose contacts, latches, timers, and counters into something that controls a real process safely. Worked examples are how that intuition gets built.

Useful viewing if you're a software engineer who wants to demystify the OT/industrial control world, an EE student preparing for an internship at a plant, or a hobbyist looking at picking up a cheap PLC. The academic framing also means he's likely to be precise about scan cycles and execution order — details that hobbyist tutorials often skip and that bite you the first time you write a latch wrong.