Hysteresis_LREAL (FB)¶

FUNCTION_BLOCK Hysteresis_LREAL

This function block will set the output variable to TRUE, if the input value \(x \in \mathbb{R}\) is smaller
than a lower bound \(x_{u} \in \mathbb{R}\).
It will set the output variable to FALSE, if the input value \(x\) exceeds the upper bound \(x_{o} \in \mathbb{R}\).
If \(x\) lies between the lower and the upper bound, the value of the output variable will rest unchanged by the module.

InOut:

Scope	Name	Type	Comment
Input	`lrValue`	`LREAL`	input value \(x \in \mathbb{R}\)
	`lrLimitPos`	`LREAL`	upper bound \(x_{o} \in \mathbb{R}\)
	`lrLimitNeg`	`LREAL`	lower bound \(x_{u} \in \mathbb{R}\)
Output	`xOut`	`BOOL`	`FALSE`: If \(x > x_{o} \land x_{u} < x_{o}\) `TRUE`: If \(x < x_{u} \land x_{u} < x_{o}\) “`xOut`” else