LIN_TRAFO (FB)¶

FUNCTION_BLOCK LIN_TRAFO

Performs a linear transformation

The transformation is performed by using the minimum and maximum values of the inputs for a linear approximation of the output value.

Application example:

A temperature sensor provides Volt-values (input IN). These are to be converted to temperature values in degree centigrade (output OUT). The input (Volt) values range is defined by the limits IN_MIN=0 and IN_MAX=10. The output(degree centigrade) value range is defined by the limits OUT_MIN=-20 and OUT_MAX=40. Thus for an input of 5 Volt a temperature of 10 degree centigrade will result.

InOut:

Scope	Name	Type	Comment
Input	`IN`	`REAL`	Input value
	`IN_MIN`	`REAL`	Minimum input value
	`IN_MAX`	`REAL`	Maximum input value
	`OUT_MIN`	`REAL`	Corresponding minimum output value
	`OUT_MAX`	`REAL`	Corresponding maximum output value
Output	`OUT`	`REAL`	Output value
Output	`ERROR`	`BOOL`	`TRUE`: `IN_MIN` = `IN_MAX` or `IN` out of input range