Detailed Description; Functional Description - Siemens sinumerik 840D sl Function Manual

Detailed description

2.1

Functional description

The description of the how the technological function works is based on the example of
HSLC (High-Speed Laser Cutting).
Calculating the switching positions
During high-speed laser cutting, e.g. as used to manufacture perforated sheets, it is
absolutely essential to switch the laser beam on/off exactly at the programmed setpoint
positions during the machining process. In order to minimize programming overheads, the
switching positions are calculated by the technological function using the velocity of the
geometry axes programmed in the part program block.
The following criteria define the setpoint position programmed in the part program block (end
of block position) as a switching position:
1. A G0 edge change
2. Overshooting/undershooting a freely programmable velocity threshold
G0 edge change
If G0 (rapid traverse) is active in a part program block (programmed or modal), the switching
signal is deactivated. Conversely, if G0 (rapid traverse) is not active in a part program block,
the switching signal is activated. The G0 edge change marks the programmed end of block
position of the previous block as the switching position.
For example, the positions X30 for G0 edge change from N10 to N20 and X100 for G0 edge
change N30 to N40 in the following figure:
Figure 2-1
Special functions: Cycle-Independent Path-Synchronous Signal Output (TE8)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
Switching signal states and G0 edge change
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