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PLC Programming Articles
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SCADA vs HMI vs PLC
SCADA, HMI, and PLC get used almost interchangeably in job postings and casual shop-floor conversation, but they aren't competing technologies, they're three different layers of the same control system, each…
Proximity Sensors Explained: Inductive vs Capacitive vs Photoelectric
Inductive, capacitive, and photoelectric sensors all answer the same basic question, is something there?, but they sense completely different physical properties, and picking the wrong type is one of the…
How to Build a PLC Timer Loop Sequence
This is a full build-along tutorial that goes beyond the Bob Teaches Tech YouTube video. It covers the hardware, wiring, GX Works2 project setup, and explains each step of an…
What Is SCADA? Architecture, Components, and How It Works
SCADA lets a single operator monitor and control equipment spread across an entire plant, pipeline, or utility network — here's what the acronym actually means, the five components every system…
Structured Text Programming for PLCs: A Practical Introduction
Structured text (ST) is the IEC 61131-3 language that feels most familiar to anyone with a Pascal or C background - and it's becoming the go-to choice for sequencing, math-heavy,…
Modbus Register Types Explained: Coils, Discrete Inputs, Holding Registers
Modbus register types explained: coils, discrete inputs, holding and input registers, function codes, and addressing conventions.
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