CharCurve_LREAL (FB)¶

FUNCTION_BLOCK CharCurve_LREAL

This function block will evaluate a piecewise linear function (the characteristic curve) at an integral point \(x \in \mathbb{R}\). The characteristic curve is specified by a defined number of integral sampling points \((x_{1}, y_{1}), \dots , (x_{n}, y_{n}) \in \mathbb{R^{2}}\)

InOut:

Scope	Name	Type	Comment
Input	lrInputValue	LREAL	interpolation point \(x \in \mathbb{R}\)
	usiNoPoints	USINT	number \(N\) of sampling points defining the characteristic curve (\(2 \leq N \leq 11\))
Inout	ap2lrPoints	ARRAY [0..10] OF POINT2_LREAL	array of \(N\) two dimensional sampling points \((x_{i}, y_{i})\) with \(1 \leq i \leq N\)
Output	lrOutputValue	LREAL	interpolated value at point \(x \in \mathbb{R}\)
	xError	BOOL	error flag
	wErrorID	WORD	information on error 0: No error 1: error within array of sampling points (i.e. the sampling points aren’t arranged in ascending order) 2: interpolation point diInputValue is outside of area covered by sampling points (\(x \notin [x_{1}, x_{n}]\)) 4: invalid number of sampling points