05.91 4 Programming of Motion Blocks
4.2.9 Soft approach to and exit from the contour
Programming characteristics
• The functions for approach to and exit from the contour are only effective in the block
• The following must be specified in the approach block
– The coordinates of the initial point P
0
of the contour
– The value of B (approach path without touching contour)
• The following must be specified in the exit block:
– The coordinates of the final point P
E
after exiting from the contour
– The value of B (exit path without touching contour)
• No other traversing movements must be programmed in a block containing ”G47” or
”G48”
• Auxiliary functions can be programmed both in the approach block and in the exit block
• A pure auxiliary function block may not be programmed after an approach block or before
an exit block.
• For the combination of approach and exit blocks it is important to note that “G40”
(cancellation of the TNRC) is generated in the exit block by the control: program G41 or
G42 before every approach block!
• In the case of part programs to be prepared block by block (TEACH IN) the finished part
program can be subsequently supplemented.
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• “Soft approach to and exit from a contour” is executable in
“AUTOMATIC” and “MDI” mode.
• In “Single block mode” it is important to note that the control inserts
other blocks in “Soft approach to and exit from the contour”. You
must press the “NC Start” key as many times as blocks have been
inserted.
In simulation, the ”Soft approach to and exit from the contour” function is executed in the
same way as on the machine. The approach and exit movements are displayed on the screen.
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02 4–33
SINUMERIK 880, (PG)
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