6F3B0253
7. Instructions
FUN 149
U/D
Up-down counter
Expression
Direction input | − |
| U U/D Q |
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Count input | − |
| C |
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Enable input | − |
| E A |
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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 | Operation | Output |
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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
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| X | Y | R | S | T. | C. | XW | YW | RW | SW | T | C | D | I | J | K |
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A | Count value |
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Example
X005
X006
R010
C005 | 1 |
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| 3 |
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| 1 | 1 |
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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.
216
