04.97 M-functions with Special Function
5 M-functions with Special Function
5.1 Stop at block end M00
If the M-number 0 is programmed as the 1st M-function in a traversing block, the movement is
stopped at the end of the block when executing the traversing block. The movement is not
continued before another STOP ➯ START edge is triggered.
5.2 Continuous loop M18
If the M-function M18 is programmed as 1st M-function in the last traversing block of a
traversing program, there will be an automatic return to the program start (continuous
processing of a traversing program).
There are two different cases:
• The M-function M18 is output like any other M-function. There will be no return to the
program start before the block N50 (including M18) has completely been executed.
Programming:
N5 G91 X10.000 F100.00
...................
N50 G91 X50.000 F100.00 M1=18
• If the M-function M18 is programmed as the last block of a traversing program, the
M-function will not be output, but the axis will immediately return to the program start.
Programming:
N5 G91 X10.000 F100.00
...................
N50 G91 X50.000 F100.00
N55 M1=18
In this example, the WF 723 C executes a flying block change to the program start, without
any velocity reduction in the X-axis.
©
Siemens AG 1997 All Rights Reserved 6ZB5 440-0VU02
5 – 1
WF 723 C (Programming Guide)
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