FB_CTRL_ZERO_ZONE_DAMPING

Transfer behavior in the time domain:

VAR_INPUT

VAR_INPUT
    fSetpointValue  : FLOAT;
    fActualValue    : FLOAT;
    eMode       : E_CTRL_MODE;
END_VAR

fSetpointValue : Set value of the controlled variable.

fActualValue : Actual value of the controlled variable.

eMode : Input that specifies the block's operating mode.

VAR_OUTPUT

VAR_OUTPUT
    fSetpointValueOut : FLOAT;
    fActualValueOut     : FLOAT;
    eState      : E_CTRL_STATE;
    eErrorId        : E_CTRL_ERRORCODES;
    bError      : BOOL;
END_VAR

fSetpointValueOut : filtered set value to controller.

fActualValueOut : actual value to controller.

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_ZERO_ZONE_DAMPING_PARAMS;
END_VAR

stParams : Parameter structure of the transmission element. This consists of the following elements:

TYPE
ST_CTRL_PI_PST_CTRL_ZERO_ZONE_DAMPING_PARAMSARAMS :
STRUCT
    tCtrlCycleTime     : TIME     :=  T#0ms; (* controller
cycle time [TIME] *)
    tTaskCycleTime     : TIME     :=  T#0ms; (* task cycle time
[TIME] *)
    fDampingCoefficient: FLOAT    :=  0.0; (*damping
coefficient *)
END_STRUCT
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.

fDampingCoefficient : The parameter corresponds to k_damping in the transfer function.