Equithermal Curve - Using Four Points

Equithermal Curve - Using Four Points

Full Name

Lib.Mervis.v1_0.EquithermalCurve4Point

Required Project References

Lib.Mervis

Description

A block for calculating the heating medium temperature according to an equithermal curve defined by four points.

Usage in ST

program test
    var
        eq4p: lib.mervis.v1_0.EquithermalCurve4Point;
    end_var

    eq4p();
end_program

Inputs

Name	Data Type	Retain	Mandatory Connection	Meaning
In	real	No	Yes	Outdoor temperature
X1	real	Yes	No	First point of the curve - outdoor temperature
Y1	real	Yes	No	First point of the curve - heating medium temperature
X2	real	Yes	No	Second point of the curve - outdoor temperature
Y2	real	Yes	No	Second point of the curve - heating medium temperature
X3	real	Yes	No	Third point of the curve - outdoor temperature
Y3	real	Yes	No	Third point of the curve - heating medium temperature
X4	real	Yes	No	Fourth point of the curve - outdoor temperature
Y4	real	Yes	No	Fourth point of the curve - heating medium temperature
DY	real	Yes	No	Offset for the heating medium temperature

Outputs

Name	Data Type	Meaning
Out	real	Calculated heating medium temperature

Detailed Function Description

The block calculates the heating medium temperature based on the outdoor temperature. The equithermal curve is defined by four points, with the condition that X1 < X2 < X3 < X4 must be satisfied for proper operation.

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