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T1/T1S User’s Manual
7. Instructions
CNT
Counter
Expression
Count input
C
CNT
Q
Output
Enable input
E
A
B
Function
While the enable input is ON, this instruction counts the number of the count input changes from OFF
to ON. The count value is stored in the counter register
B. When the count value reaches the set value
A, the output and the counter device corresponding to B are turned ON. When the enable input comes
OFF,
B is cleared to 0 and the output and the counter device are turned OFF.
The available data range for operand
A is 0 to 65535.
Execution condition
Enable
input
Operation
Output
OFF
No operation (
B
is cleared to 0)
OFF
ON
Count value (
B
)
<
set value (
A
)
OFF
Count value (
B
)
³
set value (
A
)
ON
Operand
Name
Device
Register
Constant Index
X
Y
R
S
T.
C. XW YW RW SW
T
C
D
I
J
K
A
Set value
Ö
Ö
Ö
Ö
Ö
Ö
Ö
Ö
Ö
Ö
0 - 65535
B
Count value
Ö
Example
X001
X002
C010
C.010
Y021
Note
·
No transitional contact is required for the
count input. The count input rising edge is
detected by this instruction.
·
For the count input, direct linking to a
connecting point is not allowed. In this
case, insert a dummy contact (always ON =
S04F, etc.) just before the input.
Refer to Note of Shift register FUN 074.
·
Multiple counter instructions (CNT) with the
same counter register are not allowed.
3
2
5
4
3
2
1
1
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