User's Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
168 Manual, 04/2011, A5E03556174-01
4.4.4 Retentive on-delay
Short description
A one-shot at the input triggers a configurable on-delay time. The output is set when this
time has expired.
Symbol in LOGO! Wiring Description
Input Trg A signal at input Trg (Trigger) triggers the on-delay
timer.
Input R A signal at input R resets the on-delay time and the
output.
Parameter T represents the on-delay time for the output (output
status transition 0 to 1).
Retentivity:
/ = no retentivity
R = The status is retentive.
4
7UJ
5
3DU
Output Q Q is set after the time T has expired.
Parameter T
Note the defaults specified in topic Time response (Page 151).
The time for parameter T can be provided by the actual value of another already-
programmed 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)
●
On-delay (Page 160) (current time Ta)
●
Off-delay (Page 164) (current time Ta)
●
On-/off-delay (Page 166) (current time Ta)