FB_BA_Mot3st

The template is used for the control of a three-step motor with fault signal, e.g. a fan.

It mainly consists of the function block StpCtrl and the base class FB_BA_ActuatorMO for the control of a multi-stage aggregate and the collection of all safety-relevant faults.

The BI objects DstStp01, DstStp02 and DstStp03 indicate faults in the respective steps.

The two templates MoniFdbStp01, MoniFdbStp02 and MoniFdbStp03 are used for feedback monitoring of steps 1 + 2 + 3, FdbStp01, FdbStp02 and FdbStp03.

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

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_Mot3st EXTENDS FB_BA_ActuatorMO
VAR_OUTPUT
  nPresentValue    : UDINT;
  bQ01             : BOOL;
  bQ02             : BOOL;
  bQ03             : BOOL;
END_VAR
VAR_INPUT CONSTANT
  DstStp01         : FB_BA_BI_Raw;
  DstStp02         : FB_BA_BI_Raw;
  DstStp03         : FB_BA_BI_Raw;
  FdbStp01         : FB_BA_BI_Raw;
  FdbStp02         : FB_BA_BI_Raw;
  FdbStp03         : FB_BA_BI_Raw;
  MoniFdbStp01     : FB_BA_FdbBinary;
  MoniFdbStp02     : FB_BA_FdbBinary;
  MoniFdbStp03     : FB_BA_FdbBinary;
  StpCtrl          : FB_BA_MotorStpCtrl;
END_VAR

Outputs

Name	Type	Description
nPresentValue	UDINT	Current control step of the motor.
bQ01	BOOL	Variable for controlling step 1 of the motor. This variable must be linked to a bus terminal.
bQ02	BOOL	Variable for controlling step 2 of the motor. This variable must be linked to a bus terminal.

Inputs CONSTANT

Name	Type	Description
DstStp01	FB_BA_BI_Raw	Binary input object is used to process the step 1 motor fault.
DstStp02	FB_BA_BI_Raw	Binary input object is used to process the step 2 motor fault.
DstStp03	FB_BA_BI_Raw	Binary input object is used to process the step 3 motor fault.
FdbStp01	FB_BA_BI_Raw	Binary input object is used to process the feedback of step 1 of the motor.
FdbStp02	FB_BA_BI_Raw	Binary input object is used to process the feedback of step 2 of the motor.
FdbStp03	FB_BA_BI_Raw	Binary input object is used to process the feedback of step 3 of the motor.
MoniFdbStp01	FB_BA_FdbBinary	Template that monitors the feedback of step 1 of the motor.
MoniFdbStp02	FB_BA_FdbBinary	Template that monitors the feedback of step 2 of the motor.
MoniFdbStp03	FB_BA_FdbBinary	Template that monitors the feedback of step 3 of the motor.
StpCtrl	FB_BA_MotorStpCtrl	The function block StpCtrl receives the numerical switch value from the base class FB_BA_ActuatorMO and converts the switch value into individual control steps.

Requirements

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