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Parameters Delta1 and Delta2
The Delta1 and Delta2 parameters can be provided by the actual value of another already-
programmed function. You can use the actual value 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.
Parameter p (number of decimals)
Applies only to the Aen, Ax, Δ
Timing diagram
Functional description
A 0 to 1 transition at input En saves the value of the signal at the analog input Ax. This saved
process variable is referred to as "Aen".
Both the analog actual values Ax and Aen are multiplied by the value at parameter A (gain),
and parameter B (offset) is then added to the product:
(Ax • gain) + offset = Actual value Aen, when input En changes from 0 to 1, or
(Ax • gain) + offset = Actual value Ax.
Output Q is set when the signal at input En = 1 and if the actual value at input Ax is out of
range of Aen - Δ
Output Q is reset, when the actual value at input Ax lies within the range of Aen - Δ
, or when the signal at input En changes to lo.
Manual, 10/2017, A5E01248535-AA
and Δ
values displayed in a message text.
to Aen + Δ
LOGO! functions
4.4 Special functions list - SF
to Aen+


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