The output A3.3 is activated 3 seconds after input E0.1 is closed and deactivated 7 seconds after it is opened again.

Diagram of an On-Off-delay timer

The above figure shows, in the first and last lines of the diagram, the development of the two signals described in the trace. The intermediate line is a design for the development of a On-delay timer whose input is E0.1. Note how the development of output A3.3, compared to that of T0, represents an Off-delay. ¡Shall we try!. We have to design a program that contains two timers: the first with an On-delay of 3 sec., has input E0.1; the second with an Off-delay of 7 sec., the input is the status of the first timer and the output is A3.3.
As shown by the AWL and ladder programs.

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