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LD Language Elements
124
SR2MAN01 11/2007
Timing Diagrams Timing diagrams are provided here to illustrate the various behaviors of the fast
counter according to its parameters:
z up-counting function TO, in single cycle mode,
z down-counting function FROM, in single cycle mode,
z up-counting function TO, in repetitive cycle mode,
z down-counting function FROM, in repetitive cycle mode.
For the following 4 charts, the blue curve represents the current value of the counter.
When it increases, it is because of pulses on I1 and when it decreases, it is because
of pulses on I2.
Up-Counting in Single Cycle Mode:
The figure below illustrates the counter function in up-counting and single cycle mode:
+32767
Confirmation
Initialization
CURRENT_COUN
TER_VALUE
Preset value
0
Output
-32767