SMC_XInterpolator (FB)

FUNCTION_BLOCK SMC_XInterpolator

SMC_XInterpolator realizes a mixture of CAM and CNC. Imagine you want to cut a specified form (described by G-code) out of a workpiece`. The workpiece is moved - by another process - (e.g. along the X-axis) and the other axes (Y, Z, etc.) should be controlled according to the current position of the workpiece (X) and the target given by the path outline.

The motion of the workpiece always follows the X-direction (other cases can be mapped on this by a rotation).

Example

If the XInterpolator is active, it will search the position on the path that matches the current x-position and it will copy the corresponding path-point in piSetPosition. The input path must have a unique position for each x-coordinate. For example, the following path is valid:

InOut:

Scope	Name	Type	Initial	Comment
Inout	X_Axis	AXIS_REF_SM3		X-axis, position of the workpiece
Input	bExecute	BOOL	FALSE	Starts on rising edge.
	poqDataIn	POINTER TO SMC_OUTQUEUE	0	The input path queue
	dLastWayPos	LREAL	0	This input enables the user to measure the path length which is covered by the interpolator. Output dWayPos is the sum of dLastWayPos and the distance covered within the current cycle. If you set dLastWayPos equal to output dWayPos, dWayPos always will be incremented by the current path section and you will get the total path length.
	bAbort	BOOL	FALSE	This input set to TRUE the processing of an outline will be aborted.
	eDirection	MC_Direction	positive	This input determines, whether the workpiece is moved in positive (positive) or negative (negative) direction along the X-axis. Other values are not allowed.
	dXOffset	LREAL	0	Offset relative to the X-axis position
Output	bDone	BOOL	FALSE	This variable is be set to TRUE, after the input path has been processed completely. The function block will perform no further actions until a reset will be executed.
	bBusy	BOOL	FALSE	TRUE, while execution of function block is not finished
	bError	BOOL	FALSE	Signals, that an error has occurred within the function block
	wErrorID	SMC_ERROR		Error identification
	piSetPosition	SMC_POSINFO		piSetPosition contains the cartesian coordinates of the set point as well as the position of the additional axes.
	iStatus	SMC_INT_STATUS		The current status of the module. IPO_UNKNOWN (0) Internal state, which may not occur after a complete run of SMC_Interpolator. IPO_ACCEL (2) : accelerating. IPO_CONSTANT (3) : running with constant velocity. IPO_DECEL (4) : braking IPO_FINISHED (5) : Processing of is finished.
	bWorking	BOOL		This output is set to TRUE as long as the processing of the path has been started, but not yet finished. Otherwise bWorking is FALSE.
	iActObjectSourceNo	DINT		Contains entry iSourceLine_No of the active SMC_GEOINFO object of the input path. Set to “-1”, if not working (any longer) (bWorking = FALSE).
	dVel	LREAL		This variable contains the current path velocity.
	vecActTangent	SMC_VECTOR3D		The path tangent in point piSetPosition. In case of dVel = 0, vecAct_Tangent will contain zeros only.
	iLastSwitch	INT		This variable contains the number of the last auxiliary mark passed. If within one cycle multiple auxiliary marks shall be passed, always only the last one will be dumped.
	dwSwitches	DWORD		This DWORD contains the current switch status of all auxiliary marks between 1 and 32. Bit0 of the DWORD signifies auxiliary mark 1, Bit31 signifies auxiliary mark 32.
	dWayPos	LREAL		See input dLastWayPos for a description.

SMC_XInterpolator.DoBeforeLeave (ACT)

SMC_XInterpolator.Init (ACT)

SMC_XInterpolator.NewObject (ACT)

SMC_XInterpolator.ResetOutputs (ACT)