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T1/T1S User’s Manual
7. Instructions
FUN 149 U/D Up-down counter
Expression
Direction input
-
U
U/D
Q
-
Output
Count input
-
C
Enable input
-
E
A
Function
While the enable input is ON, this instruction counts the number of the count input changes from OFF
to ON. The count direction (up count or down count) is selected by the state of the direction input. The
count value is stored in the counter register
A
. The count value range is 0 to 65535.
·
Up count when the direction input is ON
·
Down count when the direction input is OFF
When the enable input is OFF, the counter register
A
is cleared to 0.
Execution condition
Enable
input
Operation Output
OFF No operation (
A
is cleared to 0) OFF
ON Count value is not limit value (0 or 65535) OFF
Count value is limit value and count input is ON ON
Operand
Name Device Re
g
ister Constant Index
X Y R S T. C. XW YW RW SW T C D I J K
A
Count value
Ö
Example
X005
X006
R010
C005
C.005
Note
·
The transitional contact is required for the
count input. Otherwise, counting is
executed every scan during X005 is ON
in this example.
·
For the direction input and the count
input, direct linking to a connecting point
is not allowed. Refer to Note of Shift
register FUN 074.
2
3
3
22
111
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