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Old name %BprB

Function The function implements a two-position controller. Result The result is a value of Boolean type.

Declaration

Blok kódu

language	esl
theme	Confluence

BOOL %Bpr(
  REAL in RV,
 REAL in IV,
 REAL in DeadBand,
 REAL in Hysteresis,
 BOOL in OO/CO
  )

Parameters

RV	Required value.
IV	Input value.
DeadBand	Dead band.
Hysteresis	Hysteresis.
OO	Opening output.
CO	Closing output.

Note

Control is executed according to the left part of the figure (OO/CO = @OO) or according to the right part of the figure (OO/CO = @CO).

Parameters:

DeadBand = AC (>0) - real value
Hysteresis = BC (>0) - real value

Input variables:

IV (input value) - real value
RV (required value) - real value (constant or continuous signal)

Output variables:

OO (opening output) - value of Boolean type
CO (closing output) - value of Boolean type

Function:

State1: IV <= RV - AD, then OO=1 and CO=0
State2: RV - AD < IV < RV - AB, then OO is not changing and CO=0
State3: RV - AB <= IV <= RV + AB, then OO=CO=0
State4: RV + AB < IV < RV + AD, then OO=0 and CO is not changing
State5: RV + AD <= IV, then OO=0 and CO=1

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