Output A2.5 should activate when input E0.0 is closed and deactivate itself 5 seconds after it is reopened.

Diagram of the Off-delay timer

The operation of the Off-delay timer is shown in the time diagram. The first line represents the input signal and the second line is the corresponding output.
The program ladder has been designed using a SA (Off-delay timer) activated by the NO contact of E0.0, with a time constant equal to 500 hundredths of a second and the output connected to the coil of A2.5.

The first group of statements of the AWL program activates the timer T2 as a On-delay (SA T2) following the falling edge of the input (U E0.0) with a time constant of 5 seconds loaded in accumulator 1 (L KT500.0). The second group of statements copies the status of the timer (U T2) to the output of the PLC (= A2.5).

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