Siemens SINUMERIK 840D sl Function Manual page 489

Type 4 block search with calculation at block end point
Example with automatic tool change after block search with active tool management:
1. Set machine data:
MD11450 $MN_ SEARCH_RUN_MODE to 1
MD11602 $MN_ASUB_START_MASK Bit 0 = 1 (ASUB Start from stopped state)
2. Select ASUB "BLOCK_SEARCH_END" from PLC via FB4 (see also Section "P3: Basic
PLC program for SINUMERIK 840D sl (Page 821)").
3. Load and select part program "WORKPIECE_1".
4. Search to block end point, block number N220.
5. HMI signals "Search target found".
6. NC Start for output of action blocks.
7. With PLC signal:
DB21... DB32.6 (last action block active)
the PLC starts ASUB "BLOCK_SEARCH_END" via FC9 (see also Section "P3: Basic PLC
program for SINUMERIK 840D sl (Page 821)").
8. After the end of the ASUB (can be evaluated, e.g. via M function M90 to be defined, see
example for block N1110), the PLC sets signal
DB21, ... DBX1.6 (PLC action complete).
Alternatively, NC/PLC interface signal:
DB21-DB30 DBB318 bit 0 (ASUB is stopped)
can be scanned.
As a result, Alarm 10208 is displayed, i.e. other actions can now be performed by the
operator.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
9.7 Block search, types 1, 2, and 4:
489