Formulas
Original instructions
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)