Siemens SINUMERIK 840D sl Function Manual page 842

Rotary Axes (R2)
13.1 Brief Description
Operating range
The operating range can be defined by means of axis-specific machine and setting data
(software limit switches and working-area limitations). As soon as modulo conversion is
activated for the rotary axis (MD30310 $MA ROT_IS_MODULO = 1), the operating range is
set to unlimited and the software limit switches and working-area limitations become inactive.
Software limits switches/working-area limitations can also be activated for modulo rotary
axes dynamically via the PLC (triggered from the part program via M/H functions, if
necessary) using interface signal
DB31, ... DBX12.4 (modulo limit enabled).
The NC acknowledges this activation via interface signal
DB31, ... DBX74.4 (modulo-limit-enabled active).
Figure 13-2
Position display
The position-display range of values can be set to modulo 360° representation, which is
frequently selected for rotary axes, using
MD30320 $MA_DISPLAY_IS_MODULO = 1.
Feedrate
The programmed feedrate F corresponds to an angular velocity (degrees/min) in the case of
rotary axes.
If rotary axes and linear axes traverse a common path with G94 or G95, the feedrate should
be interpreted in the linear-axis unit of measurement (e.g., mm/min, inch/min).
The tangential velocity of the rotary axis refers to diameter D
In the case of unit diameter D=D
tangential velocity in mm/min (or inch/min) are numerically identical.
842
Limited operating area of a modulo rotary axis
, the programmed angular velocity in degrees/min and the
unit
(unit diameter D
unit
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
=360/π).
unit
Extended Functions