Behavior During Block Search - Siemens SINUMERIK 840D Function Manual

3.2.3

Behavior during block search

Function
Block search with calculation
● If the target block is located in a program section in which the axis must stop at a fixed limit,
then the fixed stop is approached if it has not yet been reached.
● If the target block is located in the program section in which the axis must not stop at a fixed
limit, then the axis leaves the fixed stop if it is still positioned there.
● If the axis is in the "Fixed stop reached" state, message 10208 "Press NC start to continue
the program" is displayed. The program can be continued with NC start.
● Clamping torque FXST and monitoring window FXSW have the value that they have for
normal program processing at the start of the target block.
Block search without calculation
The FXS, FXST and FXSW commands are ignored during the block search.
Effectiveness of FOCON/FOCOF
The state of the modal-acting torque/force reduction FOCON/FOCOF is maintained during the
block search and is effective in the approach block.
Block search with FXS or FOC
The user selects FXS or FOC in a program area of the target block in order to acquire all states
and functions of the machining last valid. The NC starts the selected program in Program test
mode automatically. After the target block has been found, the NC stops at the beginning of the
target block, deselects Program test internally again and displays the Stop condition "Search
target found" in its block display.
SERUPRO approach does not really take the FXS command into account
The approach to the programmed end position of the FXS block is only simulated without
torque limitation.
If FXS is located between the beginning of the program and the search target, the command is
not executed by the NC. The motion is only simulated up to the programmed end point.
The user can log the turning on and turning off of FXS in the part program. If necessary, the user
can start an ASUP in order to activate or deactivate FXS in this SERUPRO-ASUP.
System variable
The reference and actual state of the "travel to fixed stop" function can be read using the
following system variable:
● $AA_FXS (reference state)
● $VA_FXS (actual state)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
CAUTION
F1: Travel to fixed stop
3.2 Detailed description
101