Siemens LOGO! 24L - Page 120

LOGO! Manual
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112
Parameters T
H
and T
L
Note the default values for the parameters T
H
and T
L
in
Section 4.3.2.
Timing diagram
En
T starts
Q
T
L
T
H
The bold part of the
timing diagram ap-
pears in the on/off
delay symbol.
Description of function
If the state at the input En changes from 0 to 1, a random
time (on delay time) between 0 s and T
H
is defined and
started. If the state at the input En remains at 1 at least for
the duration of the on delay time, the output is set to 1 after
the on delay time has elapsed.
If the state at the input En switches back to 0 before the on
delay time has elapsed, the timer is reset.
If the state at the input En changes again to 0, a random
time (off delay time) between 0 s and T
L
is defined and
started.
If the state at the input En remains at 0 at least for the
duration of the off delay time, the output is set to 0 after the
off delay time has elapsed.
If the state at the input En switches back to 1 before the off
delay time has elapsed, the timer is reset.
In the event of a power failure, the elapsed time is reset.
LOGO! Functions