User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
144 Manual, 06/2014, A5E33039675
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.
Output Q
LOGO! sets output Q after the time T expires.
Parameter T
Note the defaults specified in topic Time response (Page 128).
The actual value of another already-programmed function can provide the time for parameter
T. You can use the actual values of the following functions:
● Analog comparator (Page 188)(actual value Ax – Ay)
● Analog threshold trigger (Page 183)(actual value Ax)
● Analog amplifier (Page 195)(actual value Ax)
● Analog multiplexer (Page 213)(actual value AQ)
● Analog ramp (Page 216)(actual value AQ)
● Mathematic instruction (Page 227) (actual value AQ)
● PI controller (Page 220)(actual value AQ)
● Up/down counter (Page 173)(actual value Cnt)
● Analog filter (Page 232) (actual value AQ)
● Average value (Page 237) (actual value AQ)
● Max/Min (Page 234) (actual value AQ)
● On-delay (Page 136)(current time Ta)
● Off-delay (Page 140)(current time Ta)
● On-/off-delay (Page 142)(current time Ta)
● Retentive on-delay (current time Ta)
● Wiping relay (pulse output) (Page 146)(current time Ta)