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LOGO! functions
4.4 Special functions list - SF
Parameters T, T
and T
Note the defaults of the T parameters listed in topic Time response (Page 115).
The off-delay time T, the permanent light time T
prewarning time period T
programmed function. You can use the actual values of the following functions:
● Analog comparator (Page 165) (actual value Ax – Ay)
● Analog threshold trigger (Page 160) (actual value Ax)
● Analog amplifier (Page 173) (actual value Ax)
● Analog multiplexer (Page 194) (actual value AQ)
● Analog ramp (Page 197) (actual value AQ)
● Analog math (Page 209) (actual value AQ)
● PI controller (Page 201) (actual value AQ)
● Up/down counter (Page 151) (actual value Cnt)
Select the required function by the block number. The timebase is configurable. For
information on valid ranges and parameter defaults, refer to the On-delay (Page 123) topic.
Timing diagram
Functional description
A 0 to 1 transition at input Trg sets output Q.
If output Q = 0, and input Trg is set hi at least for the duration of T
function is enabled and output Q is set accordingly.
The off-delay T is triggered when input Trg returns to 0 before T
Output Q is reset when T
You can output an off-warning signal prior to the expiration of the off-delay time (T - T
resets Q for the duration of the prewarning time period T
always resets T and the output Q.
If retentivity is not set, output Q and the expired time are reset after a power failure.
can be provided by the actual value of another already-
= T.
, the on-delay prewarning time T
, the permanent lighting
has expired.
. A subsequent signal at Trg
Manual, 10/2017, A5E01248535-AA
and the
) that


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