FB_BA_RampLmt

The function block FB_BA_RampLmt limits the increase or decrease speed of an input signal.
When fIn rises, the output fOut is limited to the slope of (fHi-fLo)/nTiUp.
When fIn falls, the output fOut is limited to the slope of (fHi-fLo)/nTiDwn.

Syntax

FUNCTION_BLOCK FB_BA_RampLmt
VAR_INPUT
  bEn            : REAL;
  fIn            : REAL;
  bSync          : BOOL;
  fSync          : REAL;
  fHi            : REAL;
  fLo            : REAL;
  nTiUp          : UDINT;
  nTiDwn         : UDINT;
END_VAR
VAR_OUTPUT
  fOut           : REAL;
END_VAR

Inputs

Name	Type	Description
bEn	BOOL	Enable function block if FALSE, then fOut = 0.0.
bEnRamp	BOOL	Enable ramp limitation, if FALSE, then fOut = fIn.
fIn	REAL	Input value of the ramp function
fHi	REAL	Upper interpolation point for calculating the ramps
fLo	REAL	Lower interpolation point for calculating the ramps. fHi must be greater than fLo, otherwise an error is output!
nTiUp	UDINT	Rise time [s]
nTiDwn	UDINT	Fall time [s]

Outputs

Name	Type	Description
fOut	REAL	Output signal, slope-limited through the ramps.

Requirements

Development environment	Required PLC library
TwinCAT 3.1 4024.35	Tc3_BA2_Common from V2.1.20.0