Siemens SINUMERIK 840Di Function Manual page 1589

Examples
4.1 Example of automatic gear step selection (M40)
4.1
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
$P_SEARCH_GEAR
Collected
N05 G94 M40 M3 S1000
N10 G96 S222
N20 G97
N30 S1500
N40 SPOS=0**
N50 M19**
N60 G94 G331 Z10 S300
N70 M42
N80 M4
N90 M70
N100 M3 M40
N999 M30
*
**
Spindles (S1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
f (PlanAxPosPCS): The speed depends on the current position of the transverse axis in the
workpiece coordinate system.
($P_SEARCH_SPOS and $P_SEARCH_SPOSMODE are programmed)
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
; 1500
; 300
; 300
; 300
; 300
; 300
Direction of rotation: Gear step:
-5 40/last GS
3 40
3 40
3 40
3 40
-19 40
-19 40
-19 40
-19 42
4 42
70 42
3 40
4
4-1