Chapter 5 Program Configuration and Operation Method
5- 10
(d) Ring counter
The current value is increased with the rising edge of the counter input signal, and the counter output
contact (Cxxx) is turned on when the current value reaches the preset value. Then the current value and
counter output contact (Cxxx) is cleared as 0 when the next rising edge of the counter input signal is
applied.
When the reset input is turned On, the counter output contact is cleared as 0.
(2) Maximum counting speed
The maximum counting speed of determined by the length of scan time. Counting is possible only when
the on/off switching time of the counter input signal is longer than scan time.
Duty is the ratio of the input signal‟s on time to off time as a percentage.
1) Use of High Speed Counter
In order to counter pulse that is faster than maximum counting speed of normal counter, use
built-in High Speed counter function.
T1 ≤ T2, n = x 100 [%]
T1 > T2, n = x 100 [%]
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