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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
Operating Instructions, 11/2017
301
● Max/Min: AQ
● Threshold trigger: Fre
You select the required function by the block number.
Parameter p (number of decimals)
Parameter p applies only to the display of the Ax value in a message text.
Description of the function
The function reads the value of the signal at the analog input Ax.
This value is multiplied by the value of parameter A (gain). Parameter B (offset) is added to
the product, as follows:
(Ax * Gain) + Offset = Actual value Ax
The function block calculates the proportion of the value Ax to the range. The block sets the
digital output Q high for the same proportion of the PT (periodic time) parameter, and sets Q
low for the remainder of the time period.
Examples with Timing Diagrams
The following examples show how the PWM instruction modulates a digital output signal
from the analog input value:
Example 1
Analog input value: 500 (range 0 to 1000)
Periodic time T: 4 seconds
The digital output of the PWM function is 2 seconds high, 2 seconds low, 2 seconds high, 2
seconds low and continues in that pattern as long as parameter "En" = high.
… 301 …


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