Siemens SINUMERIK 840Di Function Manual page 96

Detailed Description
2.3 Monitoring of static limits
Effectivity
• Immediately after the successful referencing of the machine axis.
• In all operating modes.
Constraints
• The software limit switches refer to the machine coordinate system.
• The software limit switches must be inside the range of the hardware limit switches.
• The machine axis can be moved to the position of the active software limit switch.
• PRESET
• Endlessly rotating rotary axes
Effect
Automatic operating modes (AUTOMATIC, MDI)
1. Without transformation, without overlaid movement, unchanged software limit switch:
2. With transformation:
3. With overlaid motion
2-24
After use of the function PRESET, the software limit switch monitoring is no longer active.
The machine must first be re-referenced.
No software limit switch monitoring takes place for endlessly rotating rotary axes:
MD30310 $MA_ROT_IS_MODULO == 1 (Modulo conversion for rotary axis and spindle)
A part program block with a programmed traversing motion that would lead to
overrunning of the software limit switch is not started.
Different reactions occur depending on the transformation type.
– Behavior as under 1.
or
– The part program block with a programmed traversing motion that would lead to
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.
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.
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0