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Siemens LOGO Soft Comfort Online Help Manual

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5.3 Special functions
LOGO!Soft Comfort Online Help
288 Operating Instructions, 11/2017
Timing diagram A: Function with negative difference Delta
Timing diagram B: Function with positive difference Delta
Description of the function
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 (On) threshold and difference value (Delta).
The function automatically calculates the Off parameter: Off = On + Delta, whereby Delta
may be positive or negative. See the calculation rule below.
Calculation rule
● When you set a negative differential value Delta, the On threshold ≥ Off threshold, and:
Q = 1, if the actual value Ax > On
Q = 0, if the actual value Ax ≤ Off.
See the timing diagram A.
● When you set a positive differential value Delta, the On threshold < the Off threshold, and
Q = 1, if:
On ≤ the actual value Ax < Off.
See the timing diagram B.
Particular characteristics to be noted when configuring
Refer to the help on analog block parameters in the Information on analog value processing
(Page 312) section.
Special functions (Page 241)
… 288 …


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