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Gain and offset parameters
Please note the information on gain and offset parameters in topic "Calculating the gain and
offset of analog values (Page 117)".
Parameters On and Off
The On and Off parameters can be provided by the actual value of another already-
programmed function. You can use the actual values of the following functions:
● Analog comparator (Page 165) (actual value Ax – Ay)
● Analog threshold trigger (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)
Does not apply to the display of On, Off and Ax values in a message text.
Does not apply to the comparison of On and Off values! (The compare function ignores the
decimal point.)
Timing diagram
Functional description
The function fetches the analog signal at input Ax.
Ax is multiplied by the value of the A (gain) parameter, and the value at parameter B (offset)
is added to product, i.e. (Ax • gain) + offset = actual value of Ax.
Output Q is set or reset, depending on the set thresholds. See the calculation rule below.
LOGO!
Manual, 10/2017, A5E01248535-AA
LOGO! functions
4.4 Special functions list - SF
161

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