SMC_NCNavigator (FB)¶

FUNCTION_BLOCK SMC_NCNavigator

This function block selects one of a given number of G-sentence queues. The selection is done based on the called subprogram and controlled by SMC_NCInterpreter.

Additionally to subprogram calls and returns, this function block also handles jumps to sentence numbers, jumps to jump targets, and step suppression.

InOut:

Scope	Name	Type	Comment
Inout	sentences	SMC_GSentenceQueue	The output sentence queue that can be fed into SMC_NCInterpreter. Note: this queue must have capacity 1.
Input	bExecute	BOOL	A rising edge starts the execution.
	bAbort	BOOL	If TRUE, the current processing of this function block is aborted
	bStepSuppress	BOOL	When this input is TRUE, lines of the CNC program starting with ‚/’ will be ignored. Otherwise they will be processed.
	pSentenceQueues	POINTER TO SMC_GSentenceQueue	Pointer to the first element of an array of sentence queues, one for each subprogram call depth. The first is used for the main program. Note that the last queue is reserved for parsing subprogram declarations, so the effective maximum call depth is nNumSentenceQueues - 1. Read each cycle, not only at the rising edge of bExecute.
	nNumSentenceQueues	UDINT	The number of sentence queues. Must be at least 1.
	stSubprogramDeclRequest	STRING	If this input is set to an non-empty string, the last sentence queue will be used to read the subprogram with the given name in order to store the declaration in the symbol table. Read each cycle, not only at the rising edge of bExecute.
Output	bBusy	BOOL	TRUE while execution of function block is not finished
	bError	BOOL	TRUE signals that an error has occurred within the function block.
	ErrorID	SMC_ERROR	Error identification
	errorPos	SMC_NC_SourcePosition	The source-position where an error has been detected.
	RequestedSentenceQueueIdx	UDINT	The zero-based index of the active sentence queue.
	RequestedProgramName	STRING	The program name of the requested sentence queue. Only relevant if RequestedSentenceQueueIdx is increased.