Programming; Supplementary Conditions - Siemens SINUMERIK 840D Function Manual

H1: Manual traversing
17.9 Approaching a fixed point in JOG
17.9.3

Programming

System variables
The following system variables that can be read in the part program and in the synchronous
actions for the "Approach fixed point" function.
System variable
$AA_FIX_POINT_SELECTED [<Axis>]
$AA_FIX_POINT_ACT [<Axis>]
17.9.4

Supplementary Conditions

Axis is indexing axis
The axis is not traversed and an alarm is output if the axis to be traversed is an indexing axis
and the fixed point position to be approached does not match an indexing position.
Frames active
All active frames are ignored. Traversing is performed in the machine coordinate system.
Offset values active
Active offset values (DRF, external zero offset, synchronized action offset $AA_OFF, online
tool offset) are also traversed. The fixed point is a position in the machine coordinates system.
An alarm is issued if an offset movement (DRF, external zero offset, synchronized action offset
$AA_OFF, online tool offset) is made during a fixed point approach in JOG. The position of the
fixed point to be approached in the machine coordinates system is not reached; instead a
position that would have been reached without active offset movement is reached. The NC/
PLC interface signal DB31, ... DBX75.3-5 corresponding to the fixed point is not output.
Working-area limitations
Working-area limitations (in BCS and WCS) are considered and the axis motion is stopped on
reaching the limits.
676
Description
Number of fixed point to be approached
Number of the fixed point on which the axis is cur‐
rently located
Function Manual, 06/2019, A5E47437747B AA
Axes and spindles