Siemens SINUMERIK 840D sl Function Manual page 876

Rotary Axes (R2)
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.
876
Limited operating area of a modulo rotary axis
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions