FB_CTRL_LEAD_LAG

Transfer function:

Step response with T2 > T1:

Step response with T1 > T2:

The step response at time T=0 is T1 / T2.

VAR_INPUT

VAR_INPUT
    fIn            : FLOAT;
    fManSyncValue  : FLOAT;
    bSync          : FLOAT;
    fManValue      : FLOAT;
    eMode          : E_CTRL_MODE;
END_VAR

fIn : Input value of the notch filter.

fManSyncValue : Input value that is output at the output in manual mode.

bSync : Reserve.

eMode : Input that specifies the operation mode of the function block.

bHold : A TRUE at this input will hold the internal state (and therefore also the output) constant at its current value, independently of the input value.

VAR_OUTPUT

VAR_OUTPUT
    fOut         : FLOAT;
    eState       : E_CTRL_STATE;
    eErrorId         : E_CTRL_ERRORCODES;
    bError       : BOOL;
END_VAR

fOut : lead/lag filter output.

eState : State of the function block.

eErrorId : Supplies the error number when the bError output is set.

bError: Becomes TRUE, as soon as an error occurs.

VAR_IN_OUT

VAR_IN_OUT
    stParams        : ST_CTRL_LEAD_LAG_FILTER_PARAMS;
END_VAR

stParams : Parameter structure of the lead/lag filter. This consists of the following elements:

TYPE
ST_CTRL_LEAD_LAG_FILTER_PARAMS:STRUCT    tCtrlCycleTime : TIME :=
T#0ms; (* controller cycle time [TIME] *)    tTaskCycleTime : TIME :=
T#0ms; (* task cycle time [TIME] *)    tT1        : TIME :=
T#0ms; (* T1 *)

    tT2        : TIME := T#0ms; (* T2 *)END_TYPE

tCtrlCycleTime : Cycle time with which the control loop is processed. This must be greater than or equal to the TaskCycleTime. The function block uses this input value to calculate internally whether the state and the output values have to be updated in the current cycle.

tTaskCycleTime : Cycle time with which the function block is called. If the function block is called in every cycle this corresponds to the task cycle time of the calling task.

tT1 : T1, see G(s)

tT2 : T2, see G(s)

Requirements