FB_CTRL_ZERO_ZONE_DAMPING

FB_CTRL_ZERO_ZONE_DAMPING 1:

This function block enables zero point damping to be realized in order to minimize control interventions in the range | actual value - setpoint | < ε.

Transfer behavior in the time range

FB_CTRL_ZERO_ZONE_DAMPING 2:

FB_CTRL_ZERO_ZONE_DAMPING 3:

FB_CTRL_ZERO_ZONE_DAMPING 4:

Inputs

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

Name	Type	Description
fSetpointValue	FLOAT	Setpoint of the controlled variable
fActualValue	FLOAT	Actual value of the controlled variable
eMode	E_CTRL_MODE	Input that specifies the operation mode of the function block.

Outputs

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

Name	Type	Description
fSetpointValue Out	FLOAT	Filtered setpoint to controller
fActualValueOut	FLOAT	Actual value to controller
eState	E_CTRL_STATE	State of the function block
eErrorId	E_CTRL_ERRORCODES	Supplies the error number when the output `bError` is set.
bError	BOOL	Becomes TRUE, as soon as an error occurs.

Inputs/ outputs

VAR_IN_OUT
    stParams        : ST_CTRL_ZERO_ZONE_DAMPING_PARAMS;
END_VAR

Name	Type	Description
stParams	ST_CTRL_ZERO_ZONE_ DAMPING_ PARAMS	Parameter structure of the transfer element

stParams consists of the following elements:

TYPE 
ST_CTRL_PI_PST_CTRL_ZERO_ZONE_DAMPING_PARAMS :
STRUCT
    tCtrlCycleTime         : TIME  := T#0ms;
    tTaskCycleTime         : TIME  := T#0ms;
    fDampingCoefficient    : FLOAT := 0.0;
END_STRUCT
END_TYPE

Name	Type	Description
tCtrlCycleTime	TIME	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	TIME	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.
fDampingCo efficient	FLOAT	The parameter corresponds to `k`_damping in the transfer function.