FB_FTR_IIRSpec
The function block implements an IIR filter (Infinite Impulse Response filter).
The filter coefficients of the transfer function are calculated internally on the basis of the filter specification transferred in the form of biquads. The filter specification is transferred with the structure ST_FTR_IIRSpec. Filters of type Butterworth, Chebyshev or Bessel can be specified. Low-pass, high-pass, band-pass and band-stop filters can be defined in each case.
See also:
Digital filters, Filter types and parameterization
Syntax
Declaration:
fbFilter : FB_FTR_IIRSpec(stConfig :=...)
Definition:
FUNCTION_BLOCK FB_FTR_IIRSpec
VAR_INPUT
stConfig : ST_FTR_IIRSpec;
END_VAR
VAR_OUTPUT
bError : BOOL;
bConfigured : BOOL;
ipResultMessage : I_TCMessage;
END_VAR
Inputs
Outputs
Name | Type | Description |
|---|---|---|
bError | BOOL | TRUE, if an error occurs. |
bConfigured | BOOL | TRUE if the configuration was successful. |
ipResultMessage | Interface that provides properties and methods for message handling |
Methods
Name | Definition location | Description |
|---|---|---|
Configure() | Local | Loads a new (or initial) configuration structure. |
Call() | Local | Calculates the output signal for a given input signal and filter configuration. |
Reset() | Local | Resets internal states. |
Properties
Name | Type | Access | Definition location | Initial value | Description |
|---|---|---|---|---|---|
bTraceLevelDefault | BOOL | Get, Set | Local | TRUE | TRUE if eTraceLevel = Critical |
eTraceLevel | Get, Set | Local | Critical | Severity of an event |
Requirements
Development environment | Target platform | PLC libraries to include |
|---|---|---|
TwinCAT v3.1.4022.25 | PC or CX (x64, x86) | Tc3_Filter |
See also: