FB_CTRL_DEADBAND

FB_CTRL_DEADBAND 1:

This function block provides a dead band for the input signal. If the input signal is within the dead band, this is indicated by the bInIsUnderThreshold output.

Description of the output behavior

FB_CTRL_DEADBAND 3:

VAR_INPUT

VAR_INPUT
    fIn     : FLOAT;
END_VAR

Name	Type	Description
fIn	FLOAT	Input value

VAR_OUTPUT

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

Name	Type	Description
fOut	FLOAT	Output of the function block
bInIsUnder Threshold	BOOL	A TRUE at this output indicates that the input value is within the dead band.
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.

VAR_IN_OUT

VAR_IN_OUT
    stParams        : ST_CTRL_DEADBAND_PARAMS;
END_VAR

Name	Type	Description
stParams	ST_CTRL_DEADBAND_PARAMS	Parameter structure of the function block

stParams consists of the following elements:

TYPE
ST_CTRL_DEADBAND_PARAMS:
STRUCT
    tCtrlCycleTime  : TIME := T#0ms; 
    tTaskCycleTime  : TIME := T#0ms; 
    fThreshold      : FLOAT;
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.
fThreshold	FLOAT	The function block's dead band, see diagram.