Siemens SINUMERIK 840D sl Turning Operating Manual page 458

Programming technology functions (cycles)
10.3 Contour turning
Example of the limit in longitudinal external machining
Figure 10-7
Figure 10-8
Feedrate interruption
To prevent the occurrence of excessively long chips during machining, you can program a
feedrate interruption. Parameter DI specifies the distance after which the feedrate interruption
should occur.
The interruption time or retraction distance is defined in machine data.
Residual material machining / naming conventions
G code program
For multi-channel systems, cycles attach a "_C" and a two-digit, channel-specific number to the
names of the programs to be generated, e.g. for channel 1 "_C01".
This is the reason why the name of the main program must not end with "_C" and a two-digit
number. This is monitored by the cycles.
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Permitted limit: Limit line XA is outside the contour of the blank
Impermissible limit: Limit line XA is inside the contour of the blank
Machine manufacturer
Please observe the information provided by the machine manufacturer.
Operating Manual, 06/2019, A5E44903486B AB
Turning