Hello, sorry for the delay of the response,

TON: when the input is activated, it starts counting the "presset time". When it finishes counting, it will activate the output.

TOF: when the input signal arrives, it remains inactive until the input signal drops. At this moment, when there is no signal, is when the presset time begins to count.

Pulse timer: It turns on at the same time as the input signal and turns off once the presset time has expired.

In order to better understand the basic functions, we recommend that you take a look at our ladder course, which you can find on our main page. 

Educación IECuino