FB_BA_FdbAnalogExt

The template is used to monitor analog values with dynamic switch values, e.g. for differential pressure monitoring of a fan.

	The initialization of the template takes place within the method FB_Init.

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_FdbAnalog EXTENDS FB_BA_View
VAR_INPUT
  bEn                  : BOOL;
  bCommand             : BOOL;
  fIn                  : REAL;
  fOn                  : REAL := 10.0;
  fOff                 : REAL := 2.0;
END_VAR
VAR_OUTPUT
  bDst                 : BOOL;
END_VAR
VAR_INPUT CONSTANT
  SwitchOnValue        : FB_BA_AV_Op;
  SwitchOffValue       : FB_BA_AV_Op;
  DelayFeedback        : FB_BA_AV_Op;
  DelayInterruption    : FB_BA_AV_Op;
  Dst                  : FB_BA_BV;
END_VAR
VAR
  FixedLimit           : FB_BA_Swi2P;
  FdbCtrl              : FB_BA_FdbCtrlBinary;
END_VAR

Inputs

Name	Type	Description
bEn	BOOL	General enable of the template.
bCommand	BOOL	The switching actuator output of the aggregate to be monitored is connected to the input.
fIn	REAL	The analog value to be monitored is connected to the input, e.g. a differential pressure sensor.
fOn	REAL	The switch-on value for FixedLimit is connected to the input. In the case of differential pressure monitoring, a pressure value must be selected here which must not be undershot during the running process.
fOff	REAL	The switch-off value for FixedLimit is connected to the input. This value must be just below the switch-on value fOn.

Outputs

Name	Type	Description
bDst	BOOL	Binary object for displaying the fault.

Inputs CONSTANT

Name	Type	Description
SwitchOnValue	FB_BA_AV_Op	Analog value object for entering the switch-on value for fOn.
SwitchOffValue	FB_BA_AV_Op	Analog value object for entering the switch-off value for fOff.
DelayFeedback	FB_BA_AV_Op	Analog value object for entering the time delay of the "Aggregate ready for operation" information. In the case of differential pressure monitoring, a time delay must be specified here after which it can be assumed that the system has built up the required differential pressure.
DelayInterruption	FB_BA_AV_Op	Analog value object for entering the delay time to trigger a fault message. The message from the differential pressure sensor can be delayed, in order to buffer pressure fluctuations.
Dst	FB_BA_BV	Binary object for displaying the fault.

Variables

Name	Type	Description
FixedLimit	FB_BA_Swi2P	Conversion of the analog value fIn into a binary switching signal for FdbCtrl.
FdbCtrl	FB_BA_FdbCtrlBinary	Monitoring of the binary feedback.

Requirements

Development environment	Necessary function
TwinCAT from v3.1.4024.35	TF8040 \| TwinCAT Building Automation from V5.0.0.0