Pressing the button connected to input E0.0 will cause the five lights to light up one after the other at intervals of one second. One second after they are all lit, the lights should all go out at the same time.

Symbols have been used to program the solution to this problem. Their correspondence to the absolute operands has been defined in the following table.

The intermediate lines of the time diagram below show the development of the output of the PLC that control the Formula 1 start lights as a function of the input START that appears in the first line.

Time diagram of the lights for Formula 1

Closing this input, apart from activating the output that controls the first light, which lights up immediately, activates five timers with delayed activation type with memory at times of 1 to 5 seconds. Once the programmed time has elapsed, the output of each timer, except for T1, goes to high state and activating the corresponding light to easily obtain the desired sequence. Timer T1 turns off all the lights by deactivating L1 and all the other timers, including itself.
Put the PLC in Run mode, change switch 0.1 into a push button, press the button and …may the best man win!

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