Siemens SINUMERIK 828D Function Manual page 523

For user­defined ASUB after the SERUPRO operation
Note
If the machine manufacturer decides to start an ASUB after the SERUPRO operation as
described in item 7, the following must be observed:
Stopped status acc. to point 6. :
Machine data:
MD11602 $MN_ASUP_START_MASK
and
MD11604 $MN_ASUP_START_PRIO_LEVEL
allow the NCK to start the ASUB from stopped status automatically via the FC9 block.
Acknowledgement of FC9 only after completion of REPOS block:
The ASUB can only be signaled as complete from the FC9 block with "ASUB Done" if the
REPOS block has also been completed.
Deselection of assigned REPOS operation after Item 8:
The start of the ASUB deselects the assigned REPOS operation!
Therefore, the ASUB should be ended with REPOSA in order to retain the REPOS operation.
Deleting an unwanted REPOS operation:
The unwanted REPOS operation is deleted by completing the ASUB with M17 or RET.
Special handling of ASUB:
As a basic rule, an ASUB that ends with REPOS and is started from stopped status receives
special treatment.
The ASUB stops automatically before the REPOS block and indicates this via:
DB21, ... DBX318.0 (ASUB is stopped)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
K1: Mode group, channel, program operation, reset response
9.8 Block search Type 5 SERUPRO
523