Loops and branches

Control structures

Control structures with repeated positioning of the file pointer in the past direction (loops) are not allowed. Such loops must be resolved in streaming programs and replaced with linearized NC block sequences. The following control structures result in output of an error message and cancellation of the streaming mode:

• $FOR - $ENDFOR
• $DO - $ENDDO
• $REPEAT - $UNTIL
• $WHILE - $ENDWHILE

By contrast, control structures that only contain sequential program branching in the forward direction can also be used fully across several data packets.

• $SWITCH - $CASE - $DEFAULT – $ENDSWITCH
• $IF - $ELSE - $ELSEIF - $ENDIF

Programming example: Jump list in the forward direction

%switchstream 
(data packet 1)
N010 G00 X0 Y0 Z0 
N020 P1=10 
(data packet 2)
N030 
N040 $SWITCH P1 
N050 $CASE 1 
N060 X10 
N070 $BREAK 
N080 $CASE 5 
N090 X50 
N100 $BREAK 
N110 $CASE 9 
N120 X90 
N130 $BREAK 
N140 $CASE 10 
N150 X100 
N160 $ENDSWITCH 
: 
M30