Siemens SINUMERIK 840D Function Manual page 103

REPOS and FXS
With REPOS, the functionality of FXS is repeated automatically and called FXS-REPOS in the
following. This sequence is comparable to the FXS_SERUPRO_ASUP.MPF program. Every
axis is taken into account and the torque last programmed before the search target is applied.
The user can treat FXS separately in a SERUPRO ASUP.
The following then applies:
Every FXS action executed in the SERUPRO ASUP automatically takes care of
$AA_FXS[ <axis> ] = $VA_FXS[ <axis> ].
This deactivates FXS-REPOS for axis X.
Deactivating FXS-REPOS
FXS-REPOS is deactivated by:
● An FXS synchronized action which refers to REPOSA
● $AA_FXS[X] = $VA_FXS[X] in the SERUPRO_ASUP
Note
A SERUPRO ASUP without FXS treatment or no SERUPRO ASUP results automatically in
FXS-REPOS.
FOC-REPOS
FOC-REPOS behaves in the same way as FXS-REPOS.
A changing torque characteristic during the program preprocessing cannot be implemented
with FOC-REPOS.
Example
Axis X is traversed from position 0 to 100. FOC is switched on every 20 millimeters for 10
millimeters. The resulting torque characteristic is generated with non-modal FOC and cannot be
traced by FOC-REPOS. Axis X is traversed by FOC-REPOS with or without FOC in accordance
with the last programming before the target block.
Programming examples for FXS "Travel to fixed stop", see Function Manual "Basic Functions",
Section "Program test".
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
CAUTION
Speed too high for FXS-REPOS
FXS-REPOS traverse all path axes together to the target position. Axes with and
without FXS treatment thus traverse together with the G command and feedrate valid in the
target block. As a result, the fixed stop may be approached in rapid traverse(G0) or higher
velocity.
F1: Travel to fixed stop
3.2 Detailed description
103