Siemens SINUMERIK 840D Function Manual page 226

R2: Rotary axes
7.2 Modulo 360 degrees
Preconditions:
● The 360° modulo rotary axis must be referenced.
● Software limit switch
Software limit switch 1 or 2 to be monitored must be active:
– DB31, ... .DBX12.2 / 3 (activation)
– MD36100 $MA_POS_LIMIT_MINUS / MD36110 $MA_POS_LIMIT_PLUS (software
– MD36120 $MA_POS_LIMIT_MINUS2 / MD36130 $MA_POS_LIMIT_PLUS2 (software
● Working area limitation
Both limits must be active, either via G26/G25 or setting data:
– SD43400 $SA_ WORKAREA_PLUS_ENABLE / SD43410
– SD43420 $SA_WORKAREA_LIMIT_PLUS / SD43430
● Synchronization with STOPRE
If the traversing range limits are activated using the NC/PLC interface signal in an NC
program being executed, e.g. as a result of an M/H command at the PLC, then a
preprocessing strop must be programmed in the following block (STOPRE). Only then can it
be ensured that the activation of the traversing range limits are taken into account in the
subsequent traversing blocks.
NOTICE
User: Activation and effectiveness
If the traversing range limits of a 360° modulo rotary axis are activated by the NC/PLC
interface signal (DB31, ... DBX12.4) in a block in the main run, (e.g. using the M/H function),
under certain circumstances, as a result of the preprocessing of already subsequent
traversing blocks, the traversing range limits were not taken into account. As a consequence,
it is solely the responsibility of the user to apply suitable measures, e.g. by
programming STOPRE in the following block after activating the traversing range limits. This
means that from the activation time in the NC program, the traversing range limits are also
effective in all of the subsequent blocks.
226
limit switch 1)
limit switch 2)
$SA_WORKAREA_MINUS_ENABLE (activation)
$SA_WORKAREA_LIMIT_MINUS (limiting)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA