Siemens Logo! Manual page 312

Determining the cycle
B1
On =1000
Off=0000
3. Now start the circuit program and switch LOGO! to pa-
rameter assignment mode. In this mode, view the trigger
parameters.
B1
On =1000
Off =0000
fa =0086
4. The reciprocal value of f
execution time of the current circuit program in its me-
mory.
Explanation
The inverted flag block changes its output signal at each
program execution. Thus, one logic level (high or low) width
is exactly equivalent to the length of one cycle. Hence, a
period lasts 2 cycles.
The threshold trigger indicates the ratio of periods per 2
seconds, which results in the ratio of cycles per second.
Cycle
time
304
1+
1/f = cycle time in s
a
Edge transition of the inverted flag at
each circuit program execution
Period
B1
Press "
G_T=02:00s
f = total of measured pulses per timeb
a
is equivalent to the LOGO!
a
1 period = 1 pulse = 2 cycles
2
LOGO! Manual
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