Siemens SINUMERIK 840D sl Function Manual page 105

Effects
Automatic operating modes (AUTOMATIC, MDA)
● Without transformation, without overlaid motion, unchanged software limit switch:
A part program block with a programmed traversing motion that would lead to overrunning
of the software limit switch is not started.
● With transformation:
Different reactions occur depending on the transformation type:
– Behavior as above.
– The part program block with a programmed traversing motion that would lead to
● With overlaid motion
The part program block with a programmed traversing motion that would lead to overrunning
of the software limit switch is started. Machine axes that are traveling with overlaid motion
or have traveled with overlaid motion stop at the active software limit switch in question.
The other machine axes participating in the traversing motion are braked. The programmed
contour is left during this process.
Manual operating modes
● JOG without transformation
The machine axis stops at the software limit switch position.
● JOG with transformation
The machine axis stops at the software limit switch position. Other machine axes
participating in the traversing motion are braked. The preset path is left during this process.
General
● Changing of the software limit switch (1st ↔ 2nd software limit switch)
If the actual position of the machine axis after changing lies behind the software limit switch,
it is stopped with the maximum permissible acceleration.
● Overrunning the software limit switch in JOG mode
If the position of the software limit switch is reached and renewed pressing of the traversing
button should cause further travel in this direction, an alarm is displayed and the axis is not
traversed farther:
Alarm 10621 "Channel <Channel number> Axis <Axis name> is at the software limit switch
<Direction>"
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
or
overrunning of the software limit switch is started. The affected machine axis stops at
the active software limit switch. The other machine axes participating in the traversing
motion are braked. The programmed contour is left during this process.
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
105