Siemens SINUMERIK 840D Function Manual page 806

S1: Spindles
18.4 Configurable gear adaptations
Function
If the function is activated, a predefined gear stage is loaded automatically during transition to
axis mode.
The gear stage change is integrated into the M70 process and occurs after spindle deceleration
and before the loading of the servo parameter set with index 0 (note
MD35590 $MA_PARAMSET_CHANGE_ENABLE!).
The typical dialog between NC and PLC which occurs during gear stage changes is executed
in a similar way to programmed gear stage changes (M41 ... M45) performed.
Requirements
Gear stage changes during transition to axis mode require general enabling of the gear stage
change via the machine data:
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE (assign parameters to the gear stage
change).
MD35090 $MA_NUM_GEAR_STEPS (number of gear stages set up)
Activation/deactivation
The function is activated/deactivated via the machine data:
MD35014 $MA_GEAR_STEP_USED_IN_AXISMODE (gear stage for axis mode in M70)
Value
0
1 ... 5
Supplementary conditions
Gear stage change at fixed position (MD35010 $MA_GEAR_STEP_CHANGE_ENABLE = 2)
The "gear stage change at fixed position" function is supported. The sequence in M70 is then
extended by the time it takes to position the spindle. The position is approached at the current
gear stage.
Transition to axis mode without programming M70
The control system detects the transition to axis mode automatically from the program
sequence (see "Implicit transition to axis mode (Page 759)") and generates the requisite M70
sequence, including the gear stage change, within the control system.
Transition to axis mode with FC 18
Implicit gear stage change is not supported in transition to axis mode with the FC 18 ("Start
axis"). This requires the right gear stage to be engaged by the PLC application before switching
to axis mode. The gear stage change is also possible with the FC 18 ("Start gear stage
change").
Change from axis mode to spindle mode
806
Meaning
No implicit gear stage change occurs in M70. The current gear stage is retained (default
setting!).
A gear stage change to gear stage 1 ... 5 occurs during the processing of M70.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA