Siemens SINUMERIK 802D sl Function Manual page 182

Operating Modes, Program Operation (K1)
10.3 Processing a part program
With operator panel reset:
Time sequence of VDI signals VB3300 0003 ("Program status" and "Channel status") when
processing with an event-driven program call:
Figure 10-2 Time sequence of the interface signals for program status and channel status (2)
Note
IS V3300 0003.4 ("Program status aborted") and V3300 0003.7 ("Channel status reset") are
only received if _N_PROG_EVENT_SPF has been completed.
Neither IS V3300 0003.4 ("Program status aborted") nor V3300 0003.7 ("Channel status
reset") are received between the program end and the start of the program event.
This is also the case between an operator panel reset and the start of the program event.
Special points to be noted
The following must be noted for user program _N_PROG_EVENT_SPF:
● It is run with the lowest priority and can, therefore, be interrupted by the user ASUB.
● The PLC can be advised of the processing status of _N_PROG_EVENT_SPF via user M
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functions.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0