Siemens SINUMERIK 840Di Function Manual page 160

Detailed Description
2.3 Continuous-path mode
No intermediate rounding blocks
An intermediate rounding block is not inserted in the following situations:
1
2
3
Synchronized axes
If a number of paths need to be synchronized (e.g., contour, special axis), then every path
must always have its own rounding area.
There are no practical means of achieving this exactly. Therefore, on the basis of the specific
meaning of the contour (geometry axis), the following procedure is applied:
Rounding behavior with synchronized paths
Original path for
Geometry axes
Smooth
Smooth
2-12
The axis stops between the two blocks. This occurs when ...
1 The auxiliary function output is programmed before the movement in the following block.
2 The following block does not contain a path movement.
3 An axis, which was previously a positioning axis traverses as a path axis for the first time
in the following block.
4 An axis, which was previously a path axis traverses as a positioning axis for the first time
in the following block.
5 The previous block moves geometry axes and the following block does not.
6 The following block moves geometry axes and the previous block does not.
7 Prior to thread cutting: The following block uses G33 as a preparatory function and the
previous block does not.
8 A change is made between BRISK and SOFT.
9 Axes involved in a transformation are not completely assigned to the path movement
(e.g., with oscillation, positioning axes).
The rounding block would slow down part program execution. This occurs when ...
1 A rounding block is inserted between very short blocks. Since each block requires at
least one interpolation cycle, the added intermediate block would double the machining
time.
2 A block transition G64 (continuous-path mode without rounding) can be traversed
without speed reduction. Rounding would increase the machining time.
Rounding is not parameterized. This occurs when ...
1 ADISPOS == 0 in G0 blocks. (default!)
2 ADIS == 0 in non-G0 blocks. (default!)
3 On transition from G0 to non-G0 or non-G0 to G0 respectively, the smaller value from
ADISPOS and ADIS applies.
Orientation axis/
synchronized axis
Smooth
Angular path
Result for
Rounding path
Defined path is traversed exactly
Intermediate blocks,
the geometry axes follow the path exactly,
all orientation/synchronized axis paths are smoothed
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0