LG MASTER-K 120S Series User Manual page 50

Chapter 5 Power Supply / CPU
4) Ring counter
-. The current value is increased with the rising edge of the counter input signal, and the counter output relay is turned on
when the current value reaches the preset value. Then the current value and counter output relay is cleared as 0 when
the next counter input signal is applied.
5) Maximum counting speed
(1) The maximum counting speed of counter is 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.
Maximum counting
(2) Duty
Duty is the ratio of the input signal's on time to off time as a percentage.
If T1 ≤ T2,
If T1 > T2,
n
= ×
speed (C )
max
100
T1
OFF ON
T1
= ×
n )
100 (%
+
T1 T2
T2
= ×
n )
100 (%
+
T1 T2
1
where, n : duty (%), t
( times/sec)
t
s
T2
OFF
5-13
: scan time
s