FB_BA_ActuatorMdlt

The template is used to control modulating aggregates. It essentially consists of an AO object for controlling an aggregate, the priority switch PrioSwiVal for determining the modulation command, the multiplexer MuxMdlt for determining the control value and the function block PlantLock, which collects all safety-related faults.

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

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_ActuatorMdlt EXTENDS FB_BA_View
VAR_INPUT
  stCmd             : ST_BA_Mdlt;
  fValPgm           : REAL;
END_VAR
VAR_OUTPUT
  fMdlt             : REAL;
  bDst              : BOOL;
  eActivePrio       : E_BA_Priority;
END_VAR
VAR_INPUT CONSTANT PERSISTENT
  {attribute 'parameterCategory'  := 'Behaviour'}
  fMinModulation    : REAL := 20;
  {attribute 'parameterCategory'  := 'Behaviour'}
  fMaxModulation    : REAL := 100;
END_VAR
VAR_INPUT CONSTANT
  Mdlt              : FB_BA_AO_Raw;
  PlantLock         : FB_BA_PlantLock;
END_VAR
VAR
  bPrioSfty         : BOOL;
  bPrioCrit         : BOOL;

  PrioSwiVal        : FB_BA_PrioSwi_UDI04;
  MuxMdlt           : FB_BA_MMUX_R04;
END_VAR

Inputs

Name	Type	Description
stCmd	ST_BA_Mdlt	The enables and modulation commands are transmitted to the template via the command structure stCmd. The command with the highest priority determines the switching command at the binary output object Cmd and the control command at the analog output object Mdlt.
fValPgm	REAL	The control signal for modulation command E_BA_MdltCmd.eOn is transmitted to the template via the input variable fValPgm.

Outputs

Name	Type	Description
fMdlt	REAL	Current value of the analog output object.
bDst	BOOL	The variable is an evaluation of the lock priorities "Safety" and "Critical" of the project structure and indicates a triggered event.
eActivePrio	E_BA_Priority	Display of the active priority.

Inputs CONSTANT PERSISTENT

Name	Type	Description
fMinModulation	REAL	Constant minimum value when modulation command E_BA_MdltCmd.eMin is pending.
fMaxModulation	REAL	Constant maximum value when modulation command E_BA_MdltCmd.eMax is pending.

Inputs CONSTANT

Name	Type	Description
Mdlt	FB_BA_AO_Raw	Current value of the analog output object.
PlantLock	FB_BA_PlantLock	The function block PlantLock collects all safety-relevant faults at this level of the project structure and triggers switching commands in the template accordingly.

Variables

Name	Type	Description
bPrioSfty	BOOL	The variable is an evaluation of the "Safety" lock priority of the project structure.
bPrioCrit	BOOL	The variable is an evaluation of the "Critical" lock priority of the project structure.
bPrioSwiVal	FB_BA_PrioSwi_UDI04	The priority switch PrioSwiVal uses the command structure stCmd to determine the modulation command for the multiplexers MuxCmd and MuxMdlt.
MuxMdlt	FB_BA_MMUX_R04	The multiplexer MuxMdlt determines the current control value from the modulation values fValPgm, fMinModulation and fMaxModulation and the modulation command of the priority switch PrioSwiVal. The result is sent to the analog output object Mdlt.

Requirements

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