Switching On Corner Response - Siemens SINUMERIK 840D sl Function Manual

T3: Tangential control - 840D sl only
11.3 Using tangential follow-up control
MD37402 $MA_TANG_OFFSET (preselection angle for tangential follow-up)
If the angle is zero both in TANGON and in the machine date, the following axis takes the
direction of the tangent.
Figure 11-2
Activation is programmed as follows for the above example and an offset angle of 90
degrees:
TANGON(C, 90)
In response to every motion in path axes X and Y, following axis C is rotated to an angle of 90
degrees in the relation to the path tangent.
11.3.3

Switching on corner response

After axis assignment with TANG(), the TLIFT() instruction must be written if the corner
response is to be contained in an intermediate block.
TLIFT (C)
The control reads the following machine data for the tangential following axis C:
MD37400 $MA_EPS_TLIFT_TANG_STEP (Tangent angle for corner recognition)
If the tangential angle jump exceeds the angle (absolute value) of the angle set in the machine
data, the control recognizes a "corner" and approaches the new position of the follow-up axis
via an intermediate block.
System variable $AC_BLOCKTYPE
The system variable $AC_BLOCKTYPE indicates whether the current block is an intermediate
block generated by TLIFT. If the value of the system variable is 6, TLIFT inserted the current
block as an intermediate block.
510
Tangential control, offset angle of 90 degrees to path tangent
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions