LS Industrial Systems SV-iS7 PLC User Manual

Chapter 4 CPU Function
4 - 8
(4) Ring Counter
• Input Condition (D), Reset Condition (R), and preset value must be existed.
-. 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.
2) Maximum Counting Speed of Counter
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.
Duty is the ratio of the input signal’s on time to off time as a percentage.
Max. Counting Speed )
1
(
100
max
S
t
n
C −×=
n : Duty (%)
S
t
: Scan Time [s]
T1 ≤ T2, n = X 100 [%]
T1
> T2, n = --- ----------- X 100 [%]
On
Of
f
Of
f
T1 T2
T2
T1+T2
T1
T1+T2

LS Industrial Systems SV-iS7 PLC Specifications

General

Brand	LS Industrial Systems
Model	SV-iS7 PLC
Category	Computer Hardware
Language	English