Delta AS Series Operation Manual page 149

Item
Output contact
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 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.
Example:
16-bit counter
The contact is ON when the value of the counter matches the setting
value.
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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