IMO Precision Controls K7 Series User Manual page 32

Chapter 5 CPU Module
3) Up-down counter
The current value is increased with the rising edge of up-count input signal, and decreased with the rising edge of down-
count input signal. The counter output relay is turned on when the current value is equal or greater than the preset value.
Up Input condition
Down Input condition
Reset condition
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.
Input condition
Reset condition
REMARK
1. Maximum counting speed
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
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,
=
counting speed (C )
max
100
T1
= × 100 (%
n )
+
T1 T2
T2
= × 100 (%
n )
+
T1 T2
U CTD Cxxx
D
R <S> xxxx
U CTR Cxxx
R <S> xxxx
1
n
× ( n : duty (%), t
times/sec)
t
s
T1
OFF
ON
5-
: scan time
s
T2