MC_AxUtiPT1_BkPlcMc (from V3.0)
The function block calculates a first-order low-pass.
Inputs
VAR_INPUT
fInput: LREAL:=0.0;
fCycletime: LREAL:=0.001;
fT0: LREAL:=1.0;
END_VARName | Type | Description |
|---|---|---|
fInput | LREAL | The raw value of the parameter to be filtered. |
fCycletime | LREAL | [s] The cycle time of the calling PLC task. |
fT0 | LREAL | [s] The filter time constant. |
Outputs
VAR_OUTPUT
fOutput: LREAL;
bError: BOOL;
nErrorId: UDINT;
END_VARName | Type | Description |
|---|---|---|
fOutput | LREAL | The filtered value. |
bError | BOOL | This output indicates problems with the transferred parameters. |
nErrorId | UDINT | In the event of an error, coded information about the type of problem is reported here. |
Behavior of the function block
With each call the function block checks the transferred parameters. If an invalid value is detected, the function block responds with bError and a corresponding value in nErrorId. Otherwise, the internal variables are updated with fInput, and the filtered value is returned as fOutput.