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plc programming

9 articles tagged “plc programming”.

Split infographic comparing a hardwired relay control panel on the left with a PLC rack and ladder logic display on the right, showing relay coils and contacts versus digital I/O modules
relay logicplc programmingladder logic

Relay Logic vs PLC Logic: Key Differences Explained

Relay logic vs PLC logic: a practical comparison covering speed, flexibility, cost, troubleshooting and when hardwired relays still beat a PLC on the plant floor.

Aug 9, 2026 · 9 min read

Flat vector ladder logic diagram showing a set-reset flip-flop with OTL and OTU latch coils driving a shared output tag on a PLC rack
ladder logicset reset flip flopplc programming

Set-Reset Flip-Flop in Ladder Logic: Full Guide

Learn how the set-reset flip-flop works in PLC ladder logic, how it differs from a seal-in rung, and when each pattern belongs in your program.

Aug 1, 2026 · 8 min read

Flat vector infographic showing four ladder logic interlock rung patterns for PLC programming, including permissive, mutual exclusion, run confirm and safety guard circuits
ladder logicinterlocksplc programming

Ladder Logic Interlocks: How They Work and Why

Ladder logic interlocks stop dangerous or invalid machine states before they happen. Learn the four core interlock patterns, see real rung examples, and avoid the wiring gotchas that bite engineers on commissioning day.

Jul 31, 2026 · 8 min read

Flat vector ladder logic diagram showing OTL latch coil and OTU unlatch coil rungs with a shared retentive bit and memory icon
ladder logiclatching coilplc programming

OTL and OTU Latch Coils in Ladder Logic Explained

OTL and OTU latch coils hold state through a power cycle. Learn how they work in ladder logic, how they differ from seal-in rungs, and when each belongs in your program.

Jul 30, 2026 · 8 min read

Flat vector diagram of a PLC controller rack showing CPU, I/O modules, power supply, and connections to sensors and actuators representing a complete PLC system
plc basicsplc programmingwhat is a plc

What Is a PLC Controller and How Does It Work?

Learn what a PLC controller is, how it executes logic in a repeating scan cycle, and how inputs, outputs, and memory work together to control real machines.

Jul 29, 2026 · 8 min read

Flat vector diagram of an Omron NJ PLC rack connected to a laptop running Sysmac Studio ladder logic editor with I/O configuration panels open
omronsysmac studioplc programming

Omron Sysmac Studio: A Practical Getting-Started Guide

Learn how Omron Sysmac Studio works, how to set up your first NJ/NX project, configure I/O, write ladder and ST code, and connect to real hardware without the usual headaches.

Jul 21, 2026 · 9 min read

Flat vector diagram of a PLC rack with a colour-coded memory map showing BOOL, INT, DINT and REAL data type cells
plc data typesplc interview questionsplc programming

PLC Data Types: Interview Questions Answered

Preparing for a PLC interview? These 15 questions on data types, addressing and memory layout cover exactly what hiring engineers ask, with field-tested answers.

Jul 17, 2026 · 9 min read

TON TOF TONR PLC timer comparison diagram showing input and output timing waveforms
timersladder logicplc programming

TON, TOF and TONR Timers: What Actually Differs

TON, TOF and TONR timers behave very differently under power loss and input cycling. Here's exactly how each one works, with real ladder examples and common gotchas.

Jul 7, 2026 · 7 min read

CTU CTD and CTUD PLC counter instructions diagram showing preset and accumulated count values
countersladder logicplc programming

PLC Counter Instructions: CTU, CTD and CTUD Explained

CTU, CTD and CTUD counters explained with real preset values, accumulated counts, reset behaviour, and vendor-specific differences you need to know.

Jul 7, 2026 · 9 min read

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