Functional Description; General; Calculating The Switching Positions; Block-Related Switching Signal Output - Siemens SINUMERIK 840D sl Function Manual

16.2

Functional description

16.2.1

General

Note
The functionality is described with examples, with the help of the "High speed laser cutting
technology (HSLC, High Speed Laser Cutting).
16.2.2

Calculating the switching positions

16.2.2.1

Block-related switching signal output

Switching criteria
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 of the technology
function are calculated 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. G0 edge change
2. Overshooting/undershooting a freely programmable velocity threshold
G0 edge change as switching criterion
If G0 (rapid traverse) is active in a part program block (programmed or modal), the switching
signal is switched off. On the other hand: If G0 (rapid traverse) is not active in a part program
block, the switching signal is switched on. The G0 edge change marks the programmed end
of block position of the previous block as the switching position.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
TE8: Cycle-independent path-synchronous switching signal output
16.2 Functional description
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