End Point Monitoring - Siemens SINUMERIK 840D sl Function Manual

Maximum encoder limit frequency undershot
If the maximum encoder frequency limit has been exceeded and the speed subsequently falls
below the maximum encoder limit frequency (smaller S value programmed, spindle offset
switch changed, etc.), the spindle is automatically synchronized with the next zero mark or the
next Bero signal. The new synchronization will always be carried out for the active position
measuring system that has lost its synchronization and whose maximum encoder limit
frequency is currently undershot.
Special features
If the following functions are active, the maximum encoder frequency cannot be exceeded:
● Spindle positioning mode, axis mode
● Thread cutting (G33, G34, G35)
● Tapping without compensating chuck G331, G332 (does not apply to G63)
● Revolutional feedrate (G95)
● Constant cutting rate (G96, G961, G97, G971)
● SPCON
16.8.8

End point monitoring

End point monitoring
During positioning (the spindle is in positioning mode), the system monitors the distance from
the spindle (with reference to the actual position) to the programmed spindle position setpoint
(end point).
For this to work, in machine data:
MD36000 $MA_STOP_LIMIT_COARSE (Exact stop limit coarse)
and
MD36010 $MA_STOP_LIMIT_FINE (Exact stop limit fine)
two limit values can be defined as an incremental path starting from the spindle position
setpoint.
Regardless of the two limit values, the positioning of the spindle is always as accurate as
defined by the connected spindle measurement encoder, the backlash, the transmission ratio,
etc.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
S1: Spindles
16.8 Spindle monitoring
1291