FB_BA_MotCtl

The template is used to control and regulate a speed-controlled motor.

It mainly consists of a BO and AO object for controlling the motor (frequency converter), a BI object for displaying a fault and a PID controller for speed control. The function block PlantLock collects all safety-relevant faults. The enables and modulation commands are transmitted to the template via the command structure stCmd.

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

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_MotCtl EXTENDS FB_BA_View
VAR_INPUT
  fIn            : REAL;
  stCmd          : ST_BA_Mdlt;
END_VAR
VAR_OUTPUT
  bCmd           : BOOL;
  fMdlt          : REAL;
  bDst           : BOOL;
  eActivePrio    : E_BA_Priority;
END_VAR
VAR_INPUT CONSTANT
  Dst            : FB_BA_BI_Raw;
  Cmd            : FB_BA_BO_Raw;
  Mdlt           : FB_BA_AO_Raw;
  Sp             : FB_BA_AV_Op;
  Ctrl           : FB_BA_Loop;
  PlantLock      : FB_BA_PlantLock;
END_VAR
VAR
  bPrioSfty      : BOOL;
  bPrioCrit      : BOOL;
  PrioSwiVal     : FB_BA_PrioSwi_UDI04;
  MuxCmd         : FB_BA_MMUX_B04;
  MuxMdlt        : FB_BA_MMUX_R04;
  fMax           : REAL;
  fMin           : REAL;
END_VAR

Inputs

Name	Type	Description
fIn	REAL	The actual value for the controller Ctrl is connected to the input.
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.

Outputs

Name	Type	Description
bCmd	BOOL	Output of the switch value.
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

Name	Type	Description
Dst	FB_BA_BI_Raw	Binary input object is used to process a fault.
Cmd	FB_BA_BO_Raw	The binary output object is used to output a switching command and transmit it to the I/O level.
Mdlt	FB_BA_AO_Raw	Current value of the analog output object.
Sp	FB_BA_AV_Op	Entering the setpoint for the PID controller Ctrl.
Ctrl	FB_BA_Loop	PID controller.
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.
MuxCmd	FB_BA_MMUX_B04	The multiplexer MuxCmd determines the current switch value from the command of the priority switch PrioSwiVal. The resulting output is sent to the binary output object Cmd.
MuxMdlt	FB_BA_MMUX_R04	The multiplexer MuxMdlt determines the current control value from the modulation values Ctrl.fPresentValue, fMin, fMax and the modulation command of the priority switch PrioSwiVal. The resulting output is sent to the analog output object Mdlt.
fMax	REAL	Maximum value of the controller, which is output when the modulation command E_BA_MdltCmd.eMax is pending (see E_BA_Mdlt).
fMin	REAL	Minimum value of the controller, which is output when the modulation command E_BA_MdltCmd.eMin is pending (see E_BA_Mdlt).

Requirements

Development environment	Necessary function
TwinCAT from v3.1.4024.35	TF8040 \| TwinCAT Building Automation from V5.2.1.0