Siemens LOGO! Series - Page 212

LOGO! functions
4.4 Special functions list - SF
LOGO!
212 Manual, 04/2011, A5E03556174-01
Calculation rule
● If the On threshold ≥ Off threshold, then:
Q = 1, if f
a
> On
Q = 0, if f
a
≤ Off.
● If the On threshold < Off threshold, then Q = 1 if
On ≤ f
a
< Off.
Setting the Par parameter
Note
The system scans the counter limit value once per interval G_T.
View in programming mode (example):
2II 
2Q 
%
3DUDPHWHUSURWHFWLRQPRGH
2IIWKUHVKROG
2QWKUHVKROG
Press
*B7 V
%
7LPHLQWHUYDOIRUSXOVHVH[DPSOH
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
a
in
Hz.
View in parameter assignment mode (example):
ID 
2II 
2Q 
%
4 I
D
!2Q
2IIWKUHVKROG
2QWKUHVKROG
Note
f
a
always represents the total pulses measured per time unit G_T.