SMC_NCInterpreter (FB)¶

FUNCTION_BLOCK FINAL SMC_NCInterpreter

This function block is used to interpret a CNC program (Din 66025, G-code). The program is converted into a list of SMC_GeoInfo objects and stored in a queue of type SMC_OutQueue. In each call, usually one line of the program is interpreted.

This function block should be called in a separate task with a priority lower than the priority of the bus task. It should be called together with the function blocks for reading the G-Code (e.g. SMC_ReadNCFile2) and for pre-processing the path (e.g. SMC_CheckVelocities). It can be called multiple times per cycle.

InOut:

Scope	Name	Type	Initial	Comment
Inout	sentences	SMC_GSentenceQueue		The input queue of g-code sentences
Input	bExecute	BOOL		Execution starts on the rising edge.
	bAbort	BOOL		If TRUE, the current processing of this function block is aborted
	bAppend	BOOL		If TRUE, a rising edge of bExecute won’t lead to a reset of the out-queue. Instead, newly incoming data will be written to the end of the out-queue.
	piStartPosition	SMC_POSINFO		Start position of the path. Only the position of the axes (piStartPosition.dX/dY/dZ/dA/dB/dC/dA1/…/dA6) is used, the other members of piStartPosition are ignored.
	vStartToolLength	SMC_Vector3d		Start tool length.
	nSizeOutQueue	UDINT		This variable contains the size of the data buffer, the list of SMC_GEOINFO structure objects will be written to. This buffer must be able to hold at least five SMC_GEOINFO objects. Otherwise, the function block will not execute any actions at all. Its size may be predefined, but may be modified later only during a reset. It is recommended to create the buffer as described by the example below: ExampleBuf: Array[1..50] of SMC_GeoInfo; The appropriate buffer size will then be retrieved by use of the operator sizeof(ExampleBuf).
	pbyBufferOutQueue	POINTER TO ARRAY [0..0] OF SMC_GEOINFO		This input must point to the first byte of the memory area that is allocated for the SMC_OUTQUEUE structure. This area must be at least as big as defined in nSizeOutQueue. Typically the allocation of the memory buffer is done in the declaration part of the IEC-program by defining an array of SMC_GEOINFO (e.g. BUF: ARRAY[1..50] OF SMC_GEOINFO; for a buffer that can store 50 path elements). The value may be predefined, but may be modified later on only during a reset.
	bEnableSyntaxChecks	BOOL	TRUE	Turns on syntax checks that will detect invalid G-code and stop with an error in this case. It is recommended to use the syntax checks.
	eOriConv	SMC_ORI_CONVENTION	SMC_ORI_CONVENTION.ADDAXES	Defines the way the orientation in the A/B/C words is interpreted. For movement commands (such as G01, G02, …), the value determines how A/B/C are treated. For values other than SMC_ORI_CONVENTION.``ADDAXES``, the angles A/B/C may be normalized, even if no coordinate rotation has been programmed. For example with orientation convention ZYZ, a programmed orientation of A=90° B=0° C=0° may result in the (equivalent) rotation A=0° B=0° C=90° in the path element. For commands that set the decoder coordinate system (G54/G55/G56), the value determines how the coordinates A/B/C are treated. If the value is SMC_ORI_CONVENTION.``ADDAXES``, then A/B/C are treated as independent additional axes, for which offsets are set. For all other values, A/B/C are treated as an orientation, and the decoder coordinate system is rotated accordingly. Note If used with tool correction functions such as SMC_ToolLengthCorr, the same orientation convention has to be used there.
	dCircleTolerance	LREAL		Tolerance to decide whether the definition of a circle makes sense. case definition via target-position and radius: If the distance between start- and end-position (both projected onto the circle plane) is greater than 2 * the radius + MAX(fCircleTolerance, 1e-06), the circle will be converted into a line. case definition via target- and center-position: Let x be the maximum of the distance between start- and center-position and the distance between target- and center-position (projecting everything onto the circle plane). If those distances differ by more than MAX(fCircleTolerance, 0.1 * x), the circle will be converted into a line.
	pInterpreterStack	POINTER TO BYTE		Allows to supply a buffer for the interpreter stack. If 0, a default buffer of size 10240 Bytes is used. If <> 0, the given buffer will be used. This input is read each cycle.
	nInterpreterStackSizeBytes	UDINT		The size of the buffer pointed to by pInterpreterStack. Note that the size needs to be at least 1024 Bytes.
Output	bDone	BOOL		This variable will be set to TRUE as soon as the input data has been processed completely. The function block will not perform any further actions until it gets reset.
	bBusy	BOOL		TRUE, while execution of function block is not finished.
	bError	BOOL		Signals that an error has occurred within the function block.
	wErrorID	SMC_ERROR		Error identification
	errorPos	SMC_NC_SourcePosition		The source-position where an error has been detected.
	poqDataOut	POINTER TO SMC_OUTQUEUE		Pointer to the SMC_OUTQUEUE structure that manages the decoded SMC_GEOINFO objects.
	iStatus	SMC_DEC_STATUS		The current status.
	iLineNumberDecoded	DINT		The variable contains the 0-based line number of the CNC file.
	GCodeText	SMC_GCODE_TEXT		The G-Code text of the current line.
	CallstackInfo	SMC_NCCallstackInfo		Information about the callstack of the current G-Code line. Used by SMC_DisplayNCCallstack.
	aActivePrograms	ARRAY [0..(SoftMotion_NC2_Constants.IPR_CALLSTACK_SIZE - 1)] OF STRING		The currently active programs and subprograms. aActivePrograms[0] holds the name of the (sub)program that is currently interpreted. If it is a sub-program, then aActivePrograms[1] holds the name of the calling (sub)program and so on. The list of active programs is terminated by an empty string.

Methods:

GetDCS

Structure: