Off-Delay - Siemens LOGO! Series Manual

LOGO! functions
4.4 Special functions list - SF
4.4.2

Off-delay

Short description
When an on-delay is set, the output is reset when the configured time has expired.
Symbol in LOGO!
Parameter T
Note the parameter T defaults specified in topic Time response (Page 151).
The time for parameter T can be based on the actual value of another, already-configured
function. You can use the actual value 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) (0BA7 only) (actual value AQ)
● Max/Min (0BA7 only) (Page 273) (0BA7 only) (actual value AQ)
● On-delay (Page 160) (current time Ta)
● Off-delay (current time Ta)
● On-/Off-delay (Page 166) (current time Ta)
164
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 Q is set with a signal at input Trg. It holds this state
until T has expired.
Manual, 04/2011, A5E03556174-01
LOGO!