Boundary Conditions; Changing Control Parameters; Examples; Automatic Gear Step Selection (M40) - Siemens SINUMERIK 840D Function Manual

S1: Spindles

18.11 Examples

18.10

Boundary conditions

18.10.1

Changing control parameters

For spindles that are not in position-controlled mode, machine data changes also take effect
when the spindle is not stationary with the NEWCONF command.
In the case of changes to control parameters, speed setpoint jumps may occur when the new
values take effect. Control parameters are, for example:
● MD32200 $MA_POSCTRL_GAIN (servo gain factor)
● MD32210 $MA_POSCTRL_INTEGR_TIME (position controller integral time)
● MD32410 $MA_AX_JERK_TIME (time constant for the axial jerk filter)
18.11 Examples
18.11.1

Automatic gear step selection (M40)

Example
To illustrate the contents of the new block search variables:
Assumptions about automatic gear step selection (M40):
S0...500
S501..1000
S1001..2000
Content of system variables:
$P_SEARCH_S
$P_SEARCH_DIR
$P_SEARCH_GEAR
Collected
N05 G94 M40 M3 S1000
N10 G96 S222
N20 G97
N30 S1500
N40 SPOS=0**
842
1. Gear step
2. Gear step
3. Gear step
; Collected S value
; Collected direction of rotation
; Collected gear step
S value:
; 0/last speed
; 1000
: 222
; f (PlanAxPosPCS)*
; 1500
; 1500
Function Manual, 06/2019, A5E47437747B AA
Direction of ro‐ Gear step:
tation:
-5 40/last GS
3 40
3 40
3 40
3 40
-19 40
Axes and spindles