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