Siemens SINUMERIK 840DE sl Commissioning Manual page 625

For swiveling with retraction to MCS fixed position, see Chapter "Manufacturer cycle
CUST_800.SPF (Page 589)".
21.8.8 Rotary axis positioning during block search
After a block search, you must position the rotary axis as follows (refer to swivel plane).
Generally, there are two rotary axes (swivel axis and tool spindle):
Procedure
Read out the position value of the rotary axis via the following system variable:
System variable
$AC_RETPOINT[axis]
You position the rotary axis in the CYCPE_MA.SPF user cycle.
Note
So that the old rotary axis position is not swiveled in, start the block search in the G code
program after the block for the turning tool alignment.
For further information on CYCPE_MA.SPF, see Chapter "Extending the PROG_EVENT
standard cycle (Page 512)".
If you have switched off the kinematics transformation, e.g. for a tool change, you can switch
the transformation on again with the following program extension:
DEF STRING[32] U_TRAFO_NAME
U_TRAFO_NAME=$AC_TRAFO_NAME
TRAFOOF
...
TRAFOON(U_TRAFO_NAME)
21.8.9 Follow-up for rotary axis positioning after block search
The rotary axes must be positioned after a block search. If the positioning is done with follow-
up, it is possible that the linear axes will reach the software limit switch. To prevent this, the
positioning of the rotary axes is always done without follow-up by default.
Supplement for CYCPE1MA.SPF
If you nevertheless want to position the rotary axes with follow-up, you can supplement the
following in the user cycle CYCPE1MA.SPF for example:
; Position rotary axes "with follow-up":
IF($P_PROG_EVENT==5) ; Block search
SINUMERIK Operate (IM9)
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
Technologies and cycles
21.8 Turning on milling machines
Meaning
Repositioning point in the ASUB
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