Ramp

Ramp (FB)

FUNCTION_BLOCK Ramp

Short description

Limitation of the signal change of an analog input signal Typical application: damping / filtering

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
rIn	REAL			Analog value input

Outputs

Name	Data type	Value range	Initial value	Function
rOut	REAL			Analog value output
xRampActive	BOOL			Status - ramp

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
rVariation	REAL	0 …	100	Maximum change per unit of time
tTime	TIME		T#10s	Time unit
rInitValue	REAL		0	Initial value
eInitial	eInit		eInit.InputValue	Selection of the initial value
tInitDelay	TIME		T#5s	Start delay

Function description

General

The analog input signal rIn is continuously monitored for its value changes. If the signal at the analog value output rOut deviates from the input signal, it follows the input signal with the maximum signal change rate.

Setting of the time unit tTime

This setpoint / parameter may only take values >= 0. The maximum signal change rate is formed by the quotient of the setpoints / parameters rVariation and tTime formed (tTime > 0s).

The maximum signal change rate is formed by the quotient of the setpoints / parameters rVariation and task cycle time (tTime = 0s). The maximum signal change rate applies to both positive and negative value changes at the input rIn effective.

Type of initialization eInitial

This setpoint / parameter determines the type of initialization of the analog value input rIn is defined. The initialization is performed once after each CPU restart. The following options are possible:

Type	Initialization value	Note
eInit.InitValue	rInitValue	Configurable initial value
eInit.InputValue	rIn	Input value
eInit.InputValueDelayed	rIn	Delayed input value

The initialization is performed continuously regardless if the setpoint / parameter tTime has the value T#0s.

CODESYS

InOut:

Scope	Name	Type	Initial
Input	rIn	REAL
Input Const	rVariation	REAL	100
Input Const	tTime	TIME	TIME#10s0ms
Input Const	rInitValue	REAL	0
Input Const	eInitial	eInit	eInit.InputValue
Input Const	tInitDelay	TIME	TIME#5s0ms
Output	rOut	REAL
Output	xRampActive	BOOL