FB_CTRL_nPOINT

FB_CTRL_nPOINT 1:

The function block provides an n-point transfer element in the functional diagram.

Behavior of the output

FB_CTRL_nPOINT 2:

Data array for the example:

FB_CTRL_nPOINT 3:

The value of the array with the index (1,1), i.e. the left value in the first row can be chosen freely, since it is not evaluated.

VAR_INPUT

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

Name	Type	Description
fSetpointValue	FLOAT	Setpoint of the controlled variable
fActualValue	FLOAT	Actual value of the controlled variable
fManValue	BOOL	Input whose value is output in manual mode.
eMode	E_CTRL_MODE	Input that specifies the operation mode of the function block.

VAR_OUTPUT

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

Name	Type	Description
fOut	nPOINT_CTRL_ TABLE_ELEMENT	Output of the n-point element
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_nPOINT_PARAMS;
END_VAR

Name	Type	Description
stParams	ST_CTRL_nPOINT_PARAMS	Parameter structure of the n-point element

stParams consists of the following elements:

TYPE
ST_CTRL_nPOINT_PARAMS :
STRUCT
    tCtrlCycleTime           : TIME := T#0ms;
    tTaskCycleTime           : TIME := T#0ms; 
    pDataTable_ADR           : POINTER TO nPOINT_CTRL_TABLE_ELEMENT
     := 0;
    nDataTable_SIZEOF        : UINT := 0;
    nDataTable_NumberOfRows  : UINT := 0;
    fHysteresisRange         : 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.
tTaskCycle Time	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.
pDataTable_ ADR	POINTER TO nPOINT_CTRL_ TABLE_ ELEMENT	Address of the data table
nDataTable_ SIZEOF	UINT	Size of the data table in bytes
nDataTable_ NumberOf Rows	UINT	Number of rows in the data table
fHysteresis Range	FLOAT	Hysteresis range, see diagram above. The hysteresis range functions as described for FB_CTRL_2POINT.