Siemens Logo! Manual page 178

LOGO! functions
Symbol in
LOGO!
Timing diagram
R
Cnt
Dir
On=Off=5
0
Q
Functional description
The internal counter increments (Dir = 0) or decrements
(Dir = 1) by one count with every positive edge at input Cnt.
You can use input R to reset the internal count value to
'000000'. As long as R = 1, the output is also lo and the
pulses at input Cnt are not counted.
If retentivity is not set, output Q and the expired time are
reset after a power failure.
Q is set or reset depending on the current value at Cnt and
the set thresholds. See the calculation rule below.
170
Wiring
Parameter
Output Q
Description
On: On threshold
Range of values:
0...999999
Off: Off threshold
Range of values:
0...999999
Retentivity for internal
counter value Cnt:
/ = No retentivity
R = The status is retentive.
Q is set or reset, depending
on the current value at Cnt
and the set thresholds.
Internal
count value
Cnt
LOGO! Manual
A5E00380835-01