User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
166 Manual, 04/2011, A5E03556174-01
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! Wiring Description
Input Trg A positive edge (0 to 1 transition) at input Trg
(Trigger) triggers the on-delay time T
H
.
A negative edge (1 to 0 transition) at input Trg
(Trigger) triggers the off-delay time T
L
.
Parameter T
H
is the time after which the output is set hi (output
signal transition 0 to 1).
T
L
is the time after which the output is reset ( output
signal transition 1 to 0).
Retentivity:
/ = No retentivity
R = The status is retentive.
4
7UJ
3DU
Output Q Q is set when the configured time T
H
has expired and
Trg is still set. It is reset on expiration of the time T
L
, if
the trigger Trg has not been set again.
Parameters T
H
and T
L
Note the preset values for the parameters T
H
and T
L
in topic Time response (Page 151).
The on-delay and off-delay times for parameters T
H
and T
L
can be based on the actual value
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!
0
BA7, 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)