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.