Delta AS Series Operation Manual page 269

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Reset
Action of the contact

Counter function
Each time the input switches from OFF to ON, the value of the counter is the same as the output coil. Use
either the decimal constant or the value in the data register as the counter setting value.

16-bit counter:
1. Setting range: 0–32,767. The setting values 0 and 1 both mean the same thing in that the output contact
is ON when the counter counts for the first time.
2. For the general-purpose counter, the current value of the counter is cleared when there is a power
interruption. If the counter is latching, the current value of the counter and the state of the contact before
the power interruption are retained. The latched counter counts from the current value when the power
supply is restored.
3. If you use the instruction MOV or ISPSoft / DIADesigner to transmit a value bigger than the counter
setting value to the current value register C0, the contact of the counter C0 is ON and the current value
becomes the same as the counter setting value next time X0.1 switches from OFF to ON.
4. Use either the constant or the value in the data register as the counter setting value.
5. The counter setting value can be a positive or negative value. If the counter counts up from 32,767, the
next value is 0.
6. Here we uses the most common application as an example. You can use this counter with API 1003 CNT
instruction; refer to CNT instruction for more description.
Example:
Item
When the instruction RST is executed, the current value is cleared to zero,
and the contact is reset to OFF.
After the scan completes, the contact acts.
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16-bit counter