Formulas

Transfer function

The transfer function is:

Calculation formulas

The formulas actually used vary, depending on whether the function block uses the incremental or the absolute algorithm.

In a simplified form, the function block can use one of the following formulas:

Algorithm	ti	Formulas
Absolute	0
Incremental	>0

Explanation of formula variables

The meaning of the formula sizes is given in the following table:

Variable	Meaning
(new)	Value which is calculated on current execution of the function block
(old)	Value which is calculated on previous execution of the function block
OUT	Absolute value output
OUTD	Incremental value output
TermI	Value of the integral component (depending on algorithm)
TermP	Value of the proportional component (depending on algorithm)