FX Series Programmable Controllers Devices in Detail 4
4-20
4.10.1 General/ Latched 16bit UP Counters
The current value of the counter increases
each time coil C0 is turned ON b
X11. The
output contact is activated when the coil is
turned ON for the tenth time (see dia
ram).
After this, the counter data remains unchan
ed
when X11 is turned ON. The counter current
value is reset to ‘0’ (zero) when the RST
instruction is executed b
turnin
ON X10 in
the example. The output contact Y0 is also
reset at the same time.
Counters can be set directl
usin
constant K
or indirectl
b
usin
data stored in a data
re
ister (ex. D). In an indirect settin
, the
desi
nation of D10 for example, which
contains the value “123” has the same effect
as a settin
of “K123”.
If a value
reater than the counter settin
is
written to a current value re
ister, the counter
counts up when the next input is turned ON.
This is true for all t
pes of counters.
Generall
, the count input frequenc
should be
around several c
cles per second.
Battery backed/latched counters:
• Counters which are batter
backed/ latched are able to retain their status information,
even after the PLC has been powered down. This means on re-powerin
up, the latched
counters can immediatel
resume from where the
were at the time of the ori
inal PLC
power down.
Available devices:
• Please see the information table on pa
e 4-19.
0
1
2
3
4
5
6
7
8
9
10
X10
X11
Y0
X11
K10
X10
C0RST
C0
C0
Y0
