On-/Off-Delay - Siemens LOGO! Series Manual

LOGO! functions
4.4 Special functions list - SF
4.4.3

On-/Off-delay

Short description
The on-/off-delay function sets the output after the set on-delay time has expired, and resets
it upon expiration of the off-delay time.
Symbol in LOGO!
Parameters T and T
H
Note the preset values for the parameters T
The on-delay and off-delay times for parameters T
of another, already-configured function. You can use the actual values of the following
functions:
● Analog comparator (Page 218) (actual value Ax - Ay)
● Analog threshold trigger (Page 213) (actual value Ax)
● Analog amplifier (Page 226) (actual value Ax)
● Analog multiplexer (Page 248) (actual value AQ)
● Analog ramp (Page 251) (actual value AQ)
● Mathematic instruction (Page 265) (actual value AQ)
● PI controller (Page 256) (actual value AQ)
● Up/down counter (Page 201) (actual value Cnt)
If your LOGO! is a LOGO! 0BA7, you can additionally use the actual values of the following
functions:
● Analog filter (0BA7 only) (Page 271) (actual value AQ)
● Average value (0BA7 only) (Page 276) (actual value AQ)
● Max/Min (0BA7 only) (Page 273) (actual value AQ)
166
Wiring
Input Trg
Parameter
Output Q
L
Description
A positive edge (0 to 1 transition) at input Trg
(Trigger) triggers the on-delay time T
A negative edge (1 to 0 transition) at input Trg
(Trigger) triggers the off-delay time T
T is the time after which the output is set hi (output
H
signal transition 0 to 1).
T is the time after which the output is reset ( output
L
signal transition 1 to 0).
Retentivity:
/ = No retentivity
R = The status is retentive.
Q is set when the configured time T
Trg is still set. It is reset on expiration of the time T
the trigger Trg has not been set again.
and T in topic Time response (Page 151).
H L
and T can be based on the actual value
H L
Manual, 04/2011, A5E03556174-01
.
H
.
L
has expired and
H
, if
L
LOGO!