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timers

2 articles tagged “timers”.

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

Traffic light PLC exercise ladder logic diagram showing four-phase timer sequencer
ladder logictimerssequencer

Traffic Light PLC Exercise: Full Ladder Logic

A traffic light PLC exercise is the perfect timer and sequencer workout. Build the full four-phase cycle in ladder logic, then add a pedestrian call button.

Jul 3, 2026 · 6 min read

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