Spindle In Position" Signal For Tool Change - Siemens SINUMERIK 840D Function Manual

are set if the distance between the spindle actual position and the programmed position
(spindle setpoint position) is less than the settings for the exact stop fine and coarse limits.
This is defined in the machine data:
MD36010 $MA_STOP_LIMIT_FINE
MD36000 $MA_STOP_LIMIT_COARSE
18.2.5.4

"Spindle in position" signal for tool change

Function
The motion sequence for a tool change, especially for milling machines, mainly comprises
positioning the spindle and then the subsequent (for optimization runs, also at the same time)
approach to the tool change position with the path axes. In this case, the mandatory
requirement is that the spindle is reached before approaching the tool change position.
If the tool change cycle is interrupted by the machine operator (e.g. with an NC stop, NC stop
axes plus spindles, mode group stop, etc.), then it must be completely ruled out that the spindle
moves into the tool changer at an incorrect position.
This is the reason that for spindle positioning, when the last programmed spindle position is
reached with "Exact stop fine" the following NC/PLC interface signal is output to check the
position:
DB31, ... DBX85.5 (spindle in position)
Note
The signal is only output for the "Spindle positioning" function.
This includes:
● SPOS, SPOSA and M19 in the part program
● SPOS and M19 in synchronized actions
● Spindle positioning, using FC18
● Spindle positioning via PLC interface (DB31, ... DBX30.4)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.2 Operating modes
755