LOGO! Manual
A5E00067781 01
114
Description of function
The trigger measures the signals at the Cnt input. The
pulses received are recorded over a parameterizable pe-
riod G_T. If the frequency of the pulses received in the pe-
riod G_T is greater than the on and the off thresholds, the
output Q switches on.
Q switches off again if the measured pulse frequency
reaches or falls below the off threshold.
Par parameter setting
B03:Par
SW=0050+
SW=0048
G_T:01:00s
On threshold
Degree of
protection
Time interval for pulses
Off threshold
SW is the on threshold. It can be any frequency in the
range 0000 to 9999.
SW is the off threshold. It can be any frequency in the
range 0000 to 9999.
G_T is the time interval in which the pulses applied to Cnt
are measured. G_T can be a period between 00.05 s and
99.95 s.
Note
If you specify the time G_T a 1 s, LOGO! returns the cur-
rent frequency (in Hz) in the f
a
parameter.
f
a
is always the sum of the pulses measured per time unit
G_T.
LOGO! Functions
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