Subprogram Return M17 - Siemens SINUMERIK 840D sl Programming Manual

1.25.2.8

Subprogram return M17

Function
The return command M17 (or the part program end command M30) appears at the end of a
subprogram. It prompts the return to the calling program at the part program block following
the subprogram call.
Note
M17 and M30 are treated as equivalents in the NC language.
Syntax
PROC <program name>
...
M17/M30
General conditions
Effect of the subprogram return on continuous-path mode
If M17 (or M30) appears on its own in the part program block, active continuous-path mode in
the channel will be interrupted.
To avoid continuous-path mode being interrupted, M17 (or M30) has to be included in the last
traversing block. Furthermore, the following machine data must be set to "0":
MD20800 $MC_SPF_END_TO_VDI = 0 (no M30/M17 output to the NC/PLC interface)
Example
1. Subprogram with M17 in a separate block
Program code
N10 G64 F2000 G91 X10 Y10
N20 X10 Z10
N30 M17
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Comment
; Return jump with interruption of continuous-path
mode.
Flexible NC programming
1.25 Subprogram technique
193