Siemens LOGO! Series Manual page 212

LOGO! functions
4.4 Special functions list - SF
Calculation rule
● If the On threshold ≥ Off threshold, then:
● If the On threshold < Off threshold, then Q = 1 if
Setting the Par parameter
Note
The system scans the counter limit value once per interval G_T.
View in programming mode (example):
Press
Note
The "seconds" timebase is here set as permanent default.
When you preset a time G_T of 1 s, LOGO! returns the current frequency in parameter f
Hz.
View in parameter assignment mode (example):
Note
f always represents the total pulses measured per time unit G_T.
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Q = 1, if f > On
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Q = 0, if f ≤ Off.
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On ≤ f < Off.
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Manual, 04/2011, A5E03556174-01
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LOGO!