FB_BA_Hys_03

The template represents a sliding limit value monitoring with two switching points which, in contrast to FB_BA_Hys_02, are subject to switch-on and switch-off delays.

The switch-on and switch-off thresholds as well as the time delays are entered via analog objects.

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

Block diagram

Syntax

FUNCTION_BLOCK FB_BA_Hys_03 EXTENDS FB_BA_View
VAR_INPUT
  bEn                             : BOOL;
  fIn                             : REAL;
END_VAR
VAR_OUTPUT
  bPresentValue                   : BOOL;
  bEvent                          : BOOL;
END_VAR
VAR_INPUT CONSTANT
  On                              : FB_BA_AV_Op;
  Off                             : FB_BA_AV_Op;
  DlyOn                           : FB_BA_AV_Op;
  DlyOff                          : FB_BA_AV_Op;
  Q                               : FB_BA_BV;
END_VAR
VAR
  Swi2P                           : FB_BA_Swi2P;
END_VAR

Inputs

Name	Type	Description
bEn	BOOL	General enable of the function block.
fIn	REAL	Process value

Outputs

Name	Type	Description
bPresentValue	BOOL	Output of the current state of the hysteresis function.
bEvent	BOOL	Display of a fault or the BV object is active. bEvent is only active if the property bEventDetectionEnable of the BV object was set to TRUE. The monitoring of the binary feedback indicates a fault.

Name

Type

Description

bPresentValue

BOOL

Output of the current state of the hysteresis function.

bEvent

BOOL

Display of a fault or the BV object is active.

bEvent is only active if the property bEventDetectionEnable of the BV object was set to TRUE.

The monitoring of the binary feedback indicates a fault.

Inputs CONSTANT

Name	Type	Description
On	FB_BA_AV_Op	AV object for input of the upper limit of the hysteresis function.
Off	FB_BA_AV_Op	AV object for input of the lower limit of the hysteresis function.
DlyOn	FB_BA_AV_Op	AV object for entering the switch-on delay in seconds.
DlyOff	FB_BA_AV_Op	AV object for entering the switch-off delay in seconds.
Q	FB_BA_BV	The binary object indicates the current state of the hysteresis function.

Variables

Name	Type	Description
Swi2P	FB_BA_Swi2P	The function block Swi2P is the core of the hysteresis function.

Requirements

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