User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
140 Manual, 06/2014, A5E33039675
4.4.2
Off-delay
Short description
When an on-delay (Page 136) is set, the output is reset when the configured time has
expired.
Symbol in LOGO!
Wiring
Description
Input Trg The off-delay timer starts with a negative edge (1 to 0
transition) at input Trg (Trigger)
Input R A signal at input R resets the on-delay time and the
output.
Parameter The output switches off (transitions from1 to 0) when
the delay time T expires.
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q A signal at input Trg sets Q. Q holds this state until T
expires.
Parameter T
Note the parameter T defaults specified in topic Time response (Page 128).
The actual value of another already-configured functions can provide the time for parameter
T. You can use the actual value 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 (current time Ta)
● On-/off-delay (Page 142) (current time Ta)
● Retentive on-delay (Page 144) (current time Ta)
● Wiping relay (pulse output) (Page 146) (current time Ta)