FB_BA_AC_PreHtrTSuACtrl

The template represents the supply air temperature control of a preheater in a ventilation system. The supply air controller Ctrl is the core of the template. It is integrated into a supply air temperature control sequence.

The sequence controller is enabled using the input variable bEn and the variable stSeqLink.bEnSeqLink of the data and command structure stSeqLink.

In dehumidification mode bDehumf, the sequence controller Ctrl is disabled and thus removed from the sequence control.

The sequence controllers are enabled for sequence control via the data and command structure stSeqLink. This is indicated by the variable bSeqActv.

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

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_ActuatorAnalog EXTENDS FB_BA_View
VAR_INPUT
  bEn                  : BOOL;
  fSpTSuA              : REAL;
  fTSuA                : REAL;
  bSync                : BOOL;
  fSync                : REAL;
  bDehumf              : BOOL;
  bResetDehumf         : BOOL;
END_VAR
VAR_OUTPUT
  fY                   : REAL;
  bIsActive            : BOOL;
  bSeqActv             : BOOL;
END_VAR
VAR_IN_OUT
  stSeqLink            : ST_BA_SeqLink;
END_VAR
VAR_INPUT CONSTANT
  Ctrl                 : FB_BA_SeqCtrl;
END_VAR
VAR
  srDehumf             : SR;
  ftrigDeHum           : F_TRIG;
  rtrigSync            : R_TRIG;
  PrioSwiSync          : FB_BA_PrioSwi_R04;
END_VAR

Inputs

Name	Type	Description
bEn	BOOL	Enable the sequence controller Ctrl.
fSpTSuA	REAL	Setpoint of the supply air temperature.
fTSuA	REAL	Measured value of the supply air temperature.
bSync	BOOL	Pulse for synchronization of the sequence controller Ctrl.
fSync	REAL	Value for the synchronization of the sequence controller Ctrl.
bDehumf	BOOL	Input to set the dehumidification mode on the RS flip-flop srDehumf.
bResetDehumf	BOOL	Input to reset the dehumidification mode on the RS flip-flop srDehumf.

Outputs

Name	Type	Description
fY	REAL	Control value output control valve.
bIsActive	BOOL	The sequence controller is the active one in the sequence control.
bSeqActv	BOOL	The sequence controller is implemented in the control sequence.

Inputs/outputs

Name	Type	Description
stSeqLink	ST_BA_SeqLink	The data and command structure stSeqLink is the link between the supply air temperature sequence controller Ctrl and the supply air temperature sequence control TSeqLink of an air conditioning system.

Inputs CONSTANT

Name	Type	Description
Ctrl	FB_BA_SeqCtrl	The supply air temperature sequence controller Ctrl is the core of this template. It is responsible for the supply air temperature control of the preheater. The sequence controller is also part of the supply air temperature sequence control of an air conditioning system. The data exchange within this sequence control takes place via the data and command structure stSeqLink. The global variable E_BA_AC_SeqNumber_T.ePreHeater gives the sequence controller its sequence number within the temperature sequence control.

Name

Type

Description

Ctrl

FB_BA_SeqCtrl

The supply air temperature sequence controller Ctrl is the core of this template. It is responsible for the supply air temperature control of the preheater.

The sequence controller is also part of the supply air temperature sequence control of an air conditioning system. The data exchange within this sequence control takes place via the data and command structure stSeqLink.

The global variable E_BA_AC_SeqNumber_T.ePreHeater gives the sequence controller its sequence number within the temperature sequence control.

Variables

Name	Type	Description
srDehumf	SR	Setting the RS flip-flop srDehumf indicates that dehumidification mode is active within the air conditioning system. The sequence controller Ctrl is no longer enabled. The RS flip-flop srDehumf is reset via the input bResetDehumf.
ftrigDeHum	F_TRIG	A falling edge at input CLK of the function block ftrigDeHum synchronizes the sequence controller Ctrl to the value 0. The falling edge is triggered by resetting the dehumidification mode on the RS flip-flop srDehumf.
rtrigSync	R_TRIG	On a rising edge at input CLK of the function block rtrigSync, the sequence controller Ctrl is synchronized to the value of fSync.
PrioSwiSync	FB_BA_PrioSwi_R04	The priority switch prioritizes the synchronization of the sequence controller Ctrl

Requirements

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