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In-depth PLC programming and industrial-automation guides — ladder logic, timers, SCADA, HMI and communication, plus the practical know-how the field runs on.

Flat vector diagram of a PLC control panel showing VFD-generated electrical noise radiating toward analog signal cables and I/O modulesFeatured
plc wiringelectrical noiseinterference

PLC Panel Electrical Noise: Causes and Fixes

Electrical noise in PLC panels causes phantom inputs, drifting analog readings and comm errors. Learn the real causes and practical fixes, wiring changes included.

Aug 4, 2026 · 10 min read

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Flat vector diagram comparing relay, transistor and triac PLC output wiring with labeled terminal blocks and load connections
plc output wiringrelay outputtransistor output

PLC Output Wiring: Relay, Transistor and Triac

Relay, transistor and triac PLC outputs wire differently and fail differently. Here is exactly how to connect each type and avoid the mistakes that kill modules.

Aug 4, 2026 · 10 min read

Flat vector diagram of a PLC analog output module wired to a control valve positioner on a 4-20 mA loop and a VFD on a 0-10 V voltage output channel
analog output wiring4-20ma outputplc wiring

PLC Analog Output Wiring: 4-20 mA and 0-10 V

Step-by-step guide to wiring PLC analog outputs: 4-20 mA current loops and 0-10 V voltage signals, with real wiring gotchas, load limits and field-verified tips.

Aug 3, 2026 · 11 min read

Flat vector diagram showing four PLC counter reset methods connecting to a CTU counter function block with teal accent arrows
plc countersladder logicstudio 5000

PLC Counter Reset: 4 Methods and When to Use Each

Resetting a PLC counter sounds simple until it bites you mid-batch. This guide covers every reset method, when each one is right, and the gotchas that cause missed counts.

Aug 3, 2026 · 8 min read

Flat vector diagram of a PLC counter instruction showing the preset and accumulator fields with a done bit activating when accumulator reaches preset value
plc countersladder logiccounter instructions

PLC Counter Preset vs Accumulator: What Each Does

The preset and accumulator in a PLC counter do very different jobs. This guide explains each one, how they interact, and the real-world gotchas you need to know.

Aug 3, 2026 · 8 min read

Flat vector diagram comparing a CTU count-up and CTD count-down PLC counter instruction side by side with accumulated value bars and ladder rung connections
plc countersctu ctdladder logic

CTU vs CTD: PLC Counter Instructions Compared

CTU counts up from zero; CTD counts down from a preset. Learn when to use each, how they differ across platforms, and how to wire both into working ladder logic.

Aug 2, 2026 · 9 min read

Flat vector diagram of three cascading PLC TON timers in ladder logic where each timer done bit triggers the next step in a timed sequence
plc timersladder logicton timer

Cascading PLC Timers: Chain TON Logic Right

Learn how to cascade TON timers in PLC ladder logic to build reliable multi-step timed sequences. Real examples, common mistakes, and field-tested patterns.

Aug 2, 2026 · 7 min read