FB_BA_AnalogOutput

The function block FB_BA_AnalogOutput is used to control continuous actuators such as valves or dampers.

The input value fValue is converted into an analog value nRawValue by linear interpolation with 2 interpolation points.

Within the parameters, it is possible to activate upper (stHighLimit) and lower (stLowLimit) limit value monitoring of the output signal fPresentValue.

Syntax

FUNCTION_BLOCK FB_BA_AnalogOutput
VAR_INPUT
  fValue           : REAL;
END_VAR
VAR_INPUT CONSTANT PERSISTENT
  {region 'Variable Parameters'}
    {attribute 'parameterCategory':='Hardware'}
    stScale        : ST_BA_ScaleRealToInt := (fX01 := 0,fX02 := 100,nY01 := 0,nY02 := 32767);
    {attribute 'parameterCategory':='EventConfig'}
    stHighLimit    : ST_BA_LimitParameter := (nTimeToAbnormal := 1, nTimeToNormal := 1);
    {attribute 'parameterCategory':='EventConfig'}
    stLowLimit     : ST_BA_LimitParameter := (nTimeToAbnormal := 1, nTimeToNormal := 1);
  {endregion}
END_VAR
VAR_OUTPUT
  fPresentValue    : REAL;
  bHighLimit       : BOOL;
  bLowLimit        : BOOL;
  nRawValue        : INT; 
END_VAR

Inputs

Name	Type	Description
fValue	REAL	Setpoint for the analog output.

Inputs CONSTANT PERSISTENT

Name	Type	Description
stScale	ST_BA_ScaleRealToInt	The structure contains the interpolation points for linear interpolation.
stHighLimit	ST_BA_LimitParameter	Data and command structure for upper limit value monitoring.
stLowLimit	ST_BA_LimitParameter	Data and command structure for lower limit value monitoring.

Outputs

Name	Type	Description
fPresentValue	REAL	Current value -> fPresentValue = fValue + fOffset.
bHighLimit	BOOL	The upper limit monitoring is active.
bLowLimit	BOOL	The lower limit monitoring is active.
nRawValue	INT	Scaled value for an analog output terminal.

Prerequisites

Development environment	Required PLC library
TwinCAT from v3.1.4024.62	Tc3_BA2 from v5.5.14.0