Knowledge — ladder logic

Knowledge

Three-switch XOR ladder logic implemented as an odd-parity function

Three-Switch XOR Ladder Logic: The Correct Odd-...

A corrected guide to three-switch XOR ladder logic for SLC 500 and Logix platforms, covering odd parity, internal-bit staging, word-level XOR limits, momentary-button behavior, commissioning tests, and safety boundaries.

Read more
Studio 5000 ONS and OTE ladder logic troubleshooting example

Why Studio 5000 ONS Pulses Disappear at an OTE

Studio 5000 ONS and OTE instructions can create a valid one-scan pulse that is invisible online and unreliable as a maintained device command. Learn how to diagnose it, choose state...

Read more
SLC 500 timer value transfer and preset validation logic

Using One SLC Timer Value to Set Another Timer

Transfer one SLC timer value into another preset without creating a moving target. This guide covers time bases, one-shot capture, limits, TON/RTO behavior, HMI approval, and boundary testing.

Read more
Modular PLC chassis with processor, power supply, and analog-digital I/O cards

What Is a PLC? The Controllers That Still Run t...

PLCs still run the plant floor: scan cycles, I/O, and IEC 61131-3 languages decide whether machines stay deterministic. Here is how controllers work, where they win, and where they strain.

Read more
Dynamic Counter Presets in OpenPLC Using MOVE Function Block

Dynamic Counter Presets in OpenPLC Using MOVE F...

OpenPLC programming is evolving beyond fixed counter presets. This article explores how the MOVE function block enables dynamic, pushbutton-driven counter values, reshaping how ladder logic handles flexible production and adaptive...

Read more
How to Program BRX PLC Using Digital I/O and Ladder Logic Basics

How to Program BRX PLC Using Digital I/O and La...

Learn BRX PLC programming with digital I/O, Ethernet setup, firmware update, and ladder logic basics for industrial automation applications.

Read more