Siemens SINUMERIK 840D sl Programming Manual page 552

Additional functions
13.5 Synchronous spindle
Positioning SPOS
The following spindle can be interpolated with SPOS=.... Please refer to Programming Manual
"Fundamentals" for more information about SPOS.
Example:
N30 SPOS[2]=IC(-90)
Difference in speed M3 S... or M4 S...
A difference in speed results from signed superimposition of two sources of speed and is
programmed again for the following spindle e.g. where Sn=... or Mn=3, Mn=4 in speed
control mode during an active synchronized spindle coupling. During the process, this speed
component is derived from the main spindle using the coupling factor and the following
spindle added to this with the correct prefix.
Note
When the direction of rotation is M3 or M4, the speed S... also has to be reprogrammed
because otherwise an alarm is triggered to report missing programming.
For more information on difference in speed, see
References: /FB2/ Function Manual, Extension Functions; Synchronized Spindle (S3).
Difference in speed for COUPONC
Transfer of a movement for difference in speed
The previous programming of M3 S... or M4 S... of the following spindle is superimposed by
activating a synchronized coupling with COUPONC. The spindle speed previously
programmed into a separate block is then retained when the coupling is activated. The
difference in speed is transferred immediately.
Note
Enabling difference in speed
The difference in speed produced is only transferred when superimposition of the movement
is also enabled. Otherwise a self-canceling alarm signals this impermissible superimposition.
Dynamic response distribution on the available motor dynamic response
The dynamic response to be limited for the main spindle must be limited by programming
such that another movement component does not restrict the dynamic response of the
following spindle to an impermissible extent e.g. as a result of the difference in speed.
13-20
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
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