CalcRootParable (FB)

FUNCTION_BLOCK CalcRootParable

By use of this function block the root of a linear function \(y = a \cdot x^{2} + b \cdot x + c\) with \(a\mbox{, }b\mbox{, }c\mbox{, }x \in \mathbb{R}\), if there are some, are calculated.

InOut:

Scope	Name	Type	Comment
Input	lrParam2	LREAL	multiplier of \(x^{2}\) (corresponds to \(a\))
	lrParam1	LREAL	multiplier of \(x\) (corresponds to \(b\))
	lrParam0	LREAL	multiplier of \(1\) (corresponds to \(c\))
Output	byRoots	BYTE	number of roots (0, 1, 2 or 255 in case of infinite roots)
	lrRoot0	LREAL	first root
	lrRoot1	LREAL	second root