Справочник Пользователя для Mitsubishi Electronics 13JW55
4 - 6
4.4 Counting by Counter
Project name
QB-4
Program name
MAIN
K12
Set value in counter
C20
Y72
X1
C20
X7
0
5
7
RST
C20
*: OUT C is a 4-step instruction.
[Timing chart]
Contact X1
Coil C20
Contact C20, coil Y72
Contact X7 (input of RST instruction)
(Current value of counter)
1
2
3
11
12
0
• The counter counts when
an input signal rises.
• After the count, the
subsequent input signals
are not counted.
are not counted.
• Once the counter counts,
the contact status and the
current counter value do
not change until the RST
instruction is executed.
current counter value do
not change until the RST
instruction is executed.
• Executing the RST
instruction before the count
returns the counter to 0.
returns the counter to 0.
• The counter setting range
is from K0 and K32767. (K0
turns on (counts up) by the
execution of the
instruction.)
turns on (counts up) by the
execution of the
instruction.)
• In addition to the direct specification using K, indirect specification using D (data
register) is available.
• The counter C30 counts
when the number of rising
edges on the input signal
X0 becomes the same as
the number (such as 24)
specified by the data
register D10.
edges on the input signal
X0 becomes the same as
the number (such as 24)
specified by the data
register D10.
• This indirect specification is
useful for applying a value
specified with an external
digital switch to the counter.
specified with an external
digital switch to the counter.
0
2
4
D10
24
X0
C30
0
5
C30
Y71
D10
Set value
Digital switch
The indirect specification
using the data register D is
also available for the timer.
using the data register D is
also available for the timer.