SMC_CheckForLimits (FB)

FUNCTION_BLOCK SMC_CheckForLimits

The function block checks whether a path leaves its specific, rectangular range.

Example

Assignment of input poqDataIn

Typically, poqDataOut of the previous function block is fed to the input poqDataIn. That can be an instance of the function block SMC_NCDecoder or SMC_SmoothPath.

Allocating memory for the preprocessing of the path elements

If the function block is executed, memory is needed, in which the processing elements are copied. The buffer must be able to hold at least five SMC_GEOINFO objects. If the structure is too small, the function block performs no actions. The memory is declared in the IEC program as an array of objects of type SMC_GEOINFO.

PROGRAM Path
VAR
buf2: ARRAY[1..50] OF SMC_GeoInfo;
END_VAR

Determining the size of the allocated memory area

The size of the memory is determined by the operator SIZEOF in the implementation of the IEC program and is fed to the input nSizeOutQueue. The address of the memory is defined with the operator ADR and is fed to the input pbyBufferOutQueue.

InOut:

Scope	Name	Type	Initial	Comment
Input	bExecute	BOOL	FALSE	Execution starts on the rising edge.
	bAbort	BOOL	FALSE	TRUE: Aborts the processing of the function block
	poqDataIn	POINTER TO SMC_OUTQUEUE	NULL	Pointer to data of structure SMC_OUTQUEUE containing the path objects of type SMC_GEOINFO.
	wAddAxis	WORD		Bit field of the axes that will be tested X: Bit 0 Y: Bit 1 Z: Bit 2 A: Bit 3 B: Bit 4 C: Bit 5 P: Bit 6 Q: Bit 7 U: Bit 8 V: Bit 9 W: Bit 10 Example: 16#104 causes test of Z and U
	piMin	SMC_POSINFO		Lower edge of permissible range
	piMax	SMC_POSINFO		Upper edge of permissible range
	d3dCheckDistance	LREAL		In case of an 3D-object, the distance between the points that are checked. If 0, the number of points per object will be the object's length divided by 10, plus start- and end-position.
	diMinNoPoints	DINT	5	Apart from start- and end-position, the minimal number of points per object that are checked.
	diMaxNoPoints	DINT	100	Analogously. -1 means that there is no maximum number.
Output	bBusy	BOOL	FALSE	TRUE: Function block in execution
	bError	BOOL	FALSE	TRUE: Error has occurred
	wErrorID	SMC_ERROR	SMC_NO_ERROR	Error identification
	wAxisOutOfLimits	WORD		Axes that have left the boundary
	iSourceLine_No	DINT	-1	Line number of the object that has exceed the limit
	poqDataOut	POINTER TO SMC_OUTQUEUE	NULL	Pointer to data of structure SMC_OUTQUEUE containing the path elements of type SMC_GEOINFO that has been checked
	wLimitSwPositive	WORD		Axes that have exceeded the upper limit
	wLimitSwNegative	WORD		Axes that have exceeded the lower limit

SMC_CheckForLimits.SMC_CheckForLimitsInit (ACT)

SMC_CheckForLimits.SMC_CheckSinglePoint (ACT)

SMC_CheckForLimits.SMC_DoBeforeLeave (ACT)