Siemens SINUMERIK 840D sl Function Manual page 1673

End of positioning
The transition between the end of the positioning action (DB31, ... DBX84.5)
and the start of oscillation mode (DB31, ... DBX84.6) is defined on
reaching "Exact stop fine" (DB31, ... DB60.7) and the time value entered in machine data:
MD3510 $MA_SPIND_POSIT_DELAY_TIME
.
The determination of the transition condition has an effect firstly on the gear step change
time and secondly on the accuracy of the approach to the preset gear step change position.
Block change
The block change is stopped and the machining blocks are not started until the gear step
has been changed by the PLC (DB31, ... DBX16.3).
End of gear step change
Once the gear step change has been completed, the spindle returns to open-loop control
mode and will automatically change to the controller mode defined by SPCON or SPCOF.
All gearspecific limit values (min./max. speed of gear step, etc.) correspond to the check-
back values of the actual gear step.
Constraints
• The spindle must have at least one measuring system.
• Positioncontrolled operation must be possible and must have been activated.
• Generally, it must be possible to execute SPOS from the part program, from a
Unless all requirements can be met, the function described cannot be used successfully.
Activation
The function of gear step change at fixed position
is activated by the configuration:
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE = 2
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
synchronized action or via FC18: "Start spindle positioning" without errors.
Detailed Description
2.3 Configurable gear adaptation
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