Siemens SINUMERIK 840D sl Function Manual page 1693

Constraints
If the gear step change is suppressed, the output spindle speed moves within the speed
range specified by the current gear step.
The following restrictions apply to the subsequent activation of a gear step change with
REPOS:
• The gear step change is not activated subsequently if the spindle in the deselection or
• If the gear step cannot be activated because the spindle is in position or axis mode or a
Example
Gear step change in DryRun
N00 M3 S1000 M41
M0
N10 M42
N11 G0 X0 Y0 Z0
N12 M0
N20 G1 Z100 F1000
...
N99 M30
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
target block is a command spindle (synchronized action) or PLC spindle (FC18).
link is active, alarm 22011"Channel%1 block%3 spindle% Change to programmed gear
step not possible" is signaled.
1. Activate 1st gear step (GS) for output state;
; 1. GS is selected
; Part program stops
PI service: Activate dry run feedrate (DryRun);
; (Configuring)
; 2. 2nd GS requested, no gear step change takes place
; Positioning axes
; Part program stops
PI service: Deactivate dry run feedrate (DryRun);
; REORG and REPOS are performed
; now the gear step change to the 2nd gear step takes
place
;
;
; Part program end
Detailed Description
2.5 Programming
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