ST_FTR_IIRCoeff

Configuration structure for the function block FB_FTR_IIRCoeff.

Syntax

Definition:

TYPE ST_FTR_IIRCoeff :
STRUCT
    pCoefficientArrayAdr_A  : POINTER TO LREAL;
    nCoefficientArraySize_A : UDINT;
    pCoefficientArrayAdr_B  : POINTER TO LREAL;
    nCoefficientArraySize_B : UDINT;
    bReset                  : BOOL := TRUE;
    nOversamples            : UDINT;
    nChannels               : UDINT;
    pInitialValues          : POINTER TO LREAL;
    nInitialValuesSize      : UDINT;
END_STRUCT
END_TYPE

Parameter

Name	Type	Description
pCoefficientArrayAdr_A	Pointer to LREAL	Pointer to an array with filter coefficients a_k (denominator) [a₀, a₁, a₂, …, a_N]
nCoefficientArraySize_A	UDINT	Size of the array [a₀, a₁, a₂, ..., a_N] in BYTE
pCoefficientArrayAdr_B	Pointer to LREAL	Pointer to an array with filter coefficients b_k (numerator) [b₀, b₁, b₂, …, b_M]
nCoefficientArraySize_B	UDINT	Size of the array [b₀, b₁, b₂, ..., b_M] in BYTE
bReset	BOOL	If TRUE, a reset is performed when the filter is configured. If FALSE, the historical values x[n-k] and y[n-k] are not reset.
nOversamples	UDINT	Number of oversamples (greater than zero)
nChannels	UDINT	Number of channels (greater than zero and less than 101)
pInitialValues	Pointer to LREAL	Pointer to array with initial values (optional)
nInitialValuesSize	UDINT	Size of the array with initial values in BYTE (optional)