Siemens SINUMERIK 840Di Function Manual page 1537

Servo parameter sets of position controller 1 to 6:
The servo parameter sets are used for fast matching of the position controller to changed
properties of the machine during operation on gear change of the spindle.
If the spindle is operating in axis mode, the new gear step is stored internally and parameter
set index "0" remains active in the servo. The new gear step is activated the next time the
spindle is programmed.
For more information about closed-loop control and the servo parameter set, please refer to:
References:
/FB1/ Descriptions of Functions, Basic Machine; Velocities, Setpoint/Actual-Value Systems,
ClosedLoop Control (G2)
/PGA/ Programming Guide Advanced/Programmable Servo Parameter Set
The interpolation parameters specify gear steps 1 to 5
at the VDI interface for:
DB31, ... DBX82.0-82.2 (set gear step A to C).
The appropriate
servo parameter set is activated depending on:
DB31, ... DBX16.0-16.2 (actual gear step A to C).
One set of parameters, with the following assignment, is provided by the NC for each of the
5 gear steps:
Data set
Spindle data
Data for axis mode
Data for 1st gear step
Data for 2nd gear step
Data for 3rd gear step
Data for 4th gear step
Data for 5th gear step
*
Spindles (S1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
= the last active gear step
VDI interface Parameter set, index n
* 0
001 1
010 2
011 3
100 4
110 5
111
Detailed Description
2.3 Configurable gear adaptation
Data/content
of the data set
Monitoring functions
M40 speed
Min./max. speed
Acceleration rates
K factor
V
Transmission ratio
2-33