Function Block IMP_COUNT

The function block IMP_COUNT counts the amount of a pulse. This is used in an S0 interface to determine the energy quantity or a flow rate.

Input IMP

On a positive edge, the output SUM is calculated.

Input SIZE

Specifies the size of the additive sum. This value corresponds to the unit. See example below.

Input RES

Specifies the resolution of the additive sum. The value represents the number of pulses per unit. If this value is not specified or is equal to 0, nothing is added to the sum.

Input RESET

If the input is true, the output SUM is reset to 0.

Output SUM

The output returns the counted amount. This is calculated on a positive edge at the input IMP with the following formula:

SUM=SUM+SIZE/RES

Tip: The value of the output can be overwritten under the variables in the preview.

Example

An electricity meter generates 500 pulses per kWh and a water meter measures 0.25 liters per pulse.

Inputs/Outputs	Electricity Meter	Water Meter
SIZE	1'000	0.25
RES	500	1
SUM	in Wh	in Liters

Note: Counting in Wh is correct. This enables easy conversion to the correct SI units. If the input SIZE is set to 1, this corresponds to kWh.