ImpulseCounter

ImpulseCounter (FB)

FUNCTION_BLOCK ImpulseCounter

Short description

Counter for input impulses with reset input and adjustable reduction

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xImpulse	BOOL			Count input
xReset	BOOL		FALSE	reset input

Outputs

Name	Data type	Value range	Initial value	Function
udiImpulseCounter	UDINT			Pulse counter
udiEnergy	UDINT			Pulse counter after reduction
dtLastImpulse	DATE_AND_TIME			Date/time of the end of the last count pulse

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
udiEnergyFactor	UDINT		1	Reduction factor

Function description

General

This function block is used to count the impulses (= rising edges) at the counter input xImpulse within the technical limits. The counter value is shown at the output udiImpulseCounter . If the counter value exceeds / reaches udiImpulseCounter the threshold value udiEnergyFactor, the output udiEnergy is incremented. Subsequently the output udiImpulseCounter is reset to 0. The outputs udiImpulseCounter and udiEnergy are reset to 0 as long as a rising edge is detected at the input xReset . At the output dtLastImpulse the current date / time is available after each rising edge at the input xImpulse . At the output dtLastImpulse the date / time at the end of the last rising edge is available for all other states at the input xImpulse . At the output dtLastImpulse the initialization value DT#1970-1-1-0.0.0 is output before the first rising edge.

Value ranges of the outputs udiImpulseCounter and udiEnergy

Valid counter values are within the limits 0 and 4294967295. Incrementing the counter value 4294967295 resets the counter value to 0. Subsequently the counter value is incremented continuously again.

Reduction factor udiEnergyFactor

The reduction factor udiEnergyFactor is overwritten with the value 1 after each input of the value 0.

Example - reduction factor

udiImpulseCounter = 9, udiEnergy = 0, udiEnergyFactor = 10 After a rising edge at the input xImpulse the counter values change as follows: udiImpulseCounter = 0, udiEnergy = 1, udiEnergyFactor = 10

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xImpulse	BOOL
Input	xReset	BOOL	FALSE
Input Const	udiEnergyFactor	UDINT
Output	udiImpulseCounter	UDINT
Output	udiEnergy	UDINT
Output	dtLastImpulse	DT