Siemens SINUMERIK 840D sl Programming Manual page 948

Work preparation
3.16 Axis couplings
Note
Coupling behavior for spindles in speed control mode
For spindles in the speed control mode, the coupling behavior of MASLON, MASLOF, MASLOFS
and MASLDEL are specified explicitly via the following machine data:
MD37263 $MA_MS_SPIND_COUPLING_MODE
For the default setting with MD37263 = 0, the slave axes are coupled-in and coupled-out only
when the axes involved are at standstill. MASLOFS corresponds to MASLOF.
For MD37263 = 1, the coupling instruction is immediately executed and therefore also the
motion. For MASLON the coupling is immediately closed and for MASLOFS or MASLOF
immediately opened. With MASLOF, the slave spindles rotating at this instant keep their speeds
until a new speed is programmed. However, with MASLOFS, they are braked automatically.
Note
For MASLOF/MASLOFS, the implicit preprocessing stop is not required. Because of the missing
preprocessing stop, the $P system variables for the slave axes do not provide updated values
until next programming.
Note
For the slave axis, the actual value can be synchronized to the same value of the master axis
using PRESETON. To do this, the permanent/slave coupling must be briefly switched off in order
to set the actual value of the non-referenced slave axis to the value of the master/axis with
POWER ON. Then the coupling is permanently re-established.
The permanent master/slave coupling is activated with the following MD setting:
MD37262 $MA_MS_COUPLING_ALWAYS_ACTIVE = 1
It has no effect on the language commands of the temporary coupling.
Examples
Example 1: Set actual value for the slave axis of a master/slave coupling
For a permanent master/slave coupling, PRESETON sets the actual value of the slave axis to
the value of the master axis.
Program code
$MA_MS_COUPLING_ALWAYS_ACTIVE[AX2]=0
NEWCONF
STOPRE
MASLOF(Y1)
PRESETON(AX2,$VA_IM(M_AX))
$MA_MS_COUPLING_ALWAYS_ACTIVE[AX2]=1
948
Comment
; Deactivate the permanent coupling of
the slave axis
; Activate machine data change
; Deactivate temporary coupling
; Actual value of the slave axis = actual
value of the master axis
; Activate the permanent coupling of the
slave axis
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming