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Basic ladder logic

Escalator (pdf)
It works in both directions. By pressing the button connected to the input PS or PD, the operator enables the escalator to run up or down, but the machine starts moving once a passenger walks on the floor sensor. If the operator reverses the direction while running, the escalator keeps moving in order to complete the operartion.

Automatic gate (pdf)
By pressing the start button the lamp turns on and two seconds after the motor starts opening. The photocell does not work when the gate is full closed. If an object is detected the gate stops closing and starts opening two seconds later.

Toggle on-off (pdf)
This code turns on and off an output with a single push button, without special instructions: just a logic relay is used.