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ladder·IEC 61131-3·industrial·complexity 1/3

Ladder logic: motor start/stop seal-in

The canonical PLC program: three-wire motor start/stop with a seal-in contact that latches the motor ON until the stop button is pressed.

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ladder·§ IEC 61131-3
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Motor Start/Stop PLC ladder logic diagram with 1 rung Motor Start/Stop Rung 001 — Seal-in circuit — Start Button START_PB IN 1.0 Aux Contact MOTOR_AUX BIT 3.0 Stop Button STOP_PB IN 1.1 Motor Command MOTOR_CMD OUT 2.0
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