seal-in circuit

Motor Starter Logic: Build a Fail-Safe System in 5 Rungs

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Motor Starter Logic: Build a Fail-Safe System in 5 Rungs

Start, stop, overload. Almost every motor in a plant is controlled by those three signals, and almost every PLC programmer writes the rung that ties them together in their first week. This is the motor starter ladder logic. It is also where a surprising number of real faults come from: a stop button examined with … Read more

Run Two 3D Machines at Once — Multi-Scene PLC Simulator

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Run Two 3D Machines at Once — Multi-Scene PLC Simulator

Until now, the ACC PLC Simulator ran one 3D scene at a time. You could program a motor starter, a conveyor, or a tank—but only one at a time— and the moment you connected a second scene, it fought the first for the same inputs. From version 1.121, that limit is gone. The multi-scene PLC … Read more

I Replaced a $5,000 PLC Trainer with Free PLC Training Simulator

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I Replaced a $5,000 PLC Trainer with Free PLC Training Simulator

I Replaced a $5,000 PLC Trainer with a Free PLC Training Simulator. A PLC training panel costs between three and eight thousand dollars. Technical colleges buy racks of them. Self-learners look at the price and walk away. Companies send employees to week-long courses at two thousand dollars per seat. I built a free PLC training … Read more