Siemens SINUMERIK 840D sl Function Manual page 208

B1: Continuous-path mode, Exact stop, Look Ahead
4.3 Continuous-path mode
Index <n>
The "Free-form surface mode: Extension function" is typically only active if the "Free-form
surface mode: Basic functions" are also active. Therefore, the settings in
MD20443 $MC_LOOKAH_FFORM[<n>] should correspond to the settings in
MD20606 $MC_PREPDYN_SMOOTHING_ON[<n>].
The standard Look Ahead functionality is active in the dynamic response modes in which the
"Free-form surface mode: Extension function" is switched off.
Programming
Generally speaking, the "Free-form surface mode: Extension function" becomes effective as
a result of a change in the dynamic response mode in the part program.
Example
The following parameters are assumed:
MD20443 $MC_LOOKAH_FFORM[0] = 0
MD20443 $MC_LOOKAH_FFORM[1] = 0
MD20443 $MC_LOOKAH_FFORM[2] = 1
MD20443 $MC_LOOKAH_FFORM[3] = 1
MD20443 $MC_LOOKAH_FFORM[4] = 1
Change of the dynamic response mode in the part program:
Program code
N10 DYNPOS
...
N100 G17 G54 F10000
N101 DYNFINISH
N102 SOFT G642
N103 X-0.274 Y149.679 Z100.000 G0
N104 COMPCAD
...
N1009 Z4.994 G01
N10010 X.520 Y149.679 Z5.000
N10011 X10.841 Y149.679 Z5.000
208
Dynamic response mode
4 Smooth finishing (DYNFINISH)
<value> Free-form surface mode: Extension
function
0 Off
1 On
Comment
; Activate DYNPOS dynamic response
mode.
Standard Look Ahead functionality is
active in the DYNPOS dynamic re-
sponse mode.
; Activate DYNFINISH dynamic re-
sponse mode.
The "Free-form surface mode: Exten-
sion functions" are active in the
DYNFINISH dynamic response mode.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions